DevOps Help and Hints

Creating various distros of Linux, installing "Curl" and check it's version:

Creating various distros of Linux, installing "Curl" and check it's version:

Installing Linux container:
Using --rm : Automatically remove the container when it exits.

PS C:\Users\MOHI> docker container run --rm -it centos:7 bash
Unable to find image 'centos:7' locally
7: Pulling from library/centos
d8d02d457314: Pull complete
Digest: sha256:307835c385f656ec2e2fec602cf093224173c51119bbebd602c53c3653a3d6eb
Status: Downloaded newer image for centos:7

[root@344b7c870c4a /]# yum update curl
Loaded plugins: fastestmirror, ovl
Determining fastest mirrors
* base: centos.mirrors.estointernet.in
* extras: centos.mirrors.estointernet.in
* updates: centos.mirrors.estointernet.in
base | 3.6 kB 00:00:00
extras | 2.9 kB 00:00:00
updates | 2.9 kB 00:00:00
(1/4): base/7/x86_64/group_gz | 165 kB 00:00:00
(2/4): extras/7/x86_64/primary_db | 153 kB 00:00:00
(3/4): updates/7/x86_64/primary_db | 2.8 MB 00:00:00
(4/4): base/7/x86_64/primary_db | 6.0 MB 00:00:02
Resolving Dependencies
--> Running transaction check
---> Package curl.x86_64 0:7.29.0-51.el7_6.3 will be updated
---> Package curl.x86_64 0:7.29.0-54.el7 will be an update
--> Processing Dependency: libcurl = 7.29.0-54.el7 for package: curl-7.29.0-54.el7.x86_64
--> Running transaction check
---> Package libcurl.x86_64 0:7.29.0-51.el7_6.3 will be updated
---> Package libcurl.x86_64 0:7.29.0-54.el7 will be an update
--> Finished Dependency Resolution

Dependencies Resolved

==================================================================================================================================================================================================================================
Package Arch Version Repository Size
==================================================================================================================================================================================================================================
Updating:
curl x86_64 7.29.0-54.el7 base 270 k
Updating for dependencies:
libcurl x86_64 7.29.0-54.el7 base 222 k

Transaction Summary
==================================================================================================================================================================================================================================
Upgrade 1 Package (+1 Dependent package)

Total download size: 493 k
Is this ok [y/d/N]: y
Downloading packages:
Delta RPMs disabled because /usr/bin/applydeltarpm not installed.
warning: /var/cache/yum/x86_64/7/base/packages/libcurl-7.29.0-54.el7.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID f4a80eb5: NOKEY
Public key for libcurl-7.29.0-54.el7.x86_64.rpm is not installed
(1/2): libcurl-7.29.0-54.el7.x86_64.rpm | 222 kB 00:00:00
(2/2): curl-7.29.0-54.el7.x86_64.rpm | 270 kB 00:00:00
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total 1.2 MB/s | 493 kB 00:00:00
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
Importing GPG key 0xF4A80EB5:
Userid : "CentOS-7 Key (CentOS 7 Official Signing Key) <security@centos.org>"
Fingerprint: 6341 ab27 53d7 8a78 a7c2 7bb1 24c6 a8a7 f4a8 0eb5
Package : centos-release-7-6.1810.2.el7.centos.x86_64 (@CentOS)
From : /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
Is this ok [y/N]: y
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Updating : libcurl-7.29.0-54.el7.x86_64 1/4
Updating : curl-7.29.0-54.el7.x86_64 2/4
Cleanup : curl-7.29.0-51.el7_6.3.x86_64 3/4
Cleanup : libcurl-7.29.0-51.el7_6.3.x86_64 4/4
Verifying : libcurl-7.29.0-54.el7.x86_64 1/4
Verifying : curl-7.29.0-54.el7.x86_64 2/4
Verifying : curl-7.29.0-51.el7_6.3.x86_64 3/4
Verifying : libcurl-7.29.0-51.el7_6.3.x86_64 4/4

Updated:
curl.x86_64 0:7.29.0-54.el7

Dependency Updated:
libcurl.x86_64 0:7.29.0-54.el7

Complete!
[root@344b7c870c4a /]# curl --version
curl 7.29.0 (x86_64-redhat-linux-gnu) libcurl/7.29.0 NSS/3.36 zlib/1.2.7 libidn/1.28 libssh2/1.4.3
Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps pop3 pop3s rtsp scp sftp smtp smtps telnet tftp
Features: AsynchDNS GSS-Negotiate IDN IPv6 Largefile NTLM NTLM_WB SSL libz unix-sockets
[root@344b7c870c4a /]#

PS C:\Users\MOHI> docker container ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
344b7c870c4a centos:7 "bash" 5 seconds ago Up 2 seconds sleepy_banzai

Installing Ubuntu container:

PS C:\Users\MOHI> docker container run --rm -it ubuntu:14.04 bash
Unable to find image 'ubuntu:14.04' locally
14.04: Pulling from library/ubuntu
a7344f52cb74: Pull complete
515c9bb51536: Pull complete
e1eabe0537eb: Pull complete
4701f1215c13: Pull complete
Digest: sha256:2f7c79927b346e436cc14c92bd4e5bd778c3bd7037f35bc639ac1589a7acfa90
Status: Downloaded newer image for ubuntu:14.04
root@edc7c3a45581:/# apt-get update && apt-get install curl (can also give apt-get update && apt-get install -y curl)

root@edc7c3a45581:/# apt-get update && apt-get install curl
Get:1 http://security.ubuntu.com trusty-security InRelease [65.9 kB]
Ign http://archive.ubuntu.com trusty InRelease
Get:2 http://archive.ubuntu.com trusty-updates InRelease [65.9 kB]
Get:3 http://security.ubuntu.com trusty-security/main amd64 Packages [1032 kB]
Get:4 http://archive.ubuntu.com trusty-backports InRelease [65.9 kB]
Get:5 http://archive.ubuntu.com trusty Release.gpg [933 B]
Get:6 http://archive.ubuntu.com trusty-updates/main amd64 Packages [1460 kB]
Get:7 http://security.ubuntu.com trusty-security/restricted amd64 Packages [18.1 kB]
Get:8 http://security.ubuntu.com trusty-security/universe amd64 Packages [377 kB]
Get:9 http://security.ubuntu.com trusty-security/multiverse amd64 Packages [4730 B]
Get:10 http://archive.ubuntu.com trusty-updates/restricted amd64 Packages [21.4 kB]
Get:11 http://archive.ubuntu.com trusty-updates/universe amd64 Packages [671 kB]
Get:12 http://archive.ubuntu.com trusty-updates/multiverse amd64 Packages [16.1 kB]
Get:13 http://archive.ubuntu.com trusty-backports/main amd64 Packages [14.7 kB]
Get:14 http://archive.ubuntu.com trusty-backports/restricted amd64 Packages [40 B]
Get:15 http://archive.ubuntu.com trusty-backports/universe amd64 Packages [52.5 kB]
Get:16 http://archive.ubuntu.com trusty-backports/multiverse amd64 Packages [1392 B]
Get:17 http://archive.ubuntu.com trusty Release [58.5 kB]
Get:18 http://archive.ubuntu.com trusty/main amd64 Packages [1743 kB]
Get:19 http://archive.ubuntu.com trusty/restricted amd64 Packages [16.0 kB]
Get:20 http://archive.ubuntu.com trusty/universe amd64 Packages [7589 kB]
Get:21 http://archive.ubuntu.com trusty/multiverse amd64 Packages [169 kB]
Fetched 13.4 MB in 38s (348 kB/s)
Reading package lists... Done
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
ca-certificates krb5-locales libasn1-8-heimdal libcurl3 libgssapi-krb5-2
libgssapi3-heimdal libhcrypto4-heimdal libheimbase1-heimdal
libheimntlm0-heimdal libhx509-5-heimdal libidn11 libk5crypto3 libkeyutils1
libkrb5-26-heimdal libkrb5-3 libkrb5support0 libldap-2.4-2
libroken18-heimdal librtmp0 libsasl2-2 libsasl2-modules libsasl2-modules-db
libwind0-heimdal openssl
Suggested packages:
krb5-doc krb5-user libsasl2-modules-otp libsasl2-modules-ldap
libsasl2-modules-sql libsasl2-modules-gssapi-mit
libsasl2-modules-gssapi-heimdal
The following NEW packages will be installed:
ca-certificates curl krb5-locales libasn1-8-heimdal libcurl3
libgssapi-krb5-2 libgssapi3-heimdal libhcrypto4-heimdal libheimbase1-heimdal
libheimntlm0-heimdal libhx509-5-heimdal libidn11 libk5crypto3 libkeyutils1
libkrb5-26-heimdal libkrb5-3 libkrb5support0 libldap-2.4-2
libroken18-heimdal librtmp0 libsasl2-2 libsasl2-modules libsasl2-modules-db
libwind0-heimdal openssl
0 upgraded, 25 newly installed, 0 to remove and 5 not upgraded.
Need to get 2660 kB of archives.
After this operation, 11.6 MB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://archive.ubuntu.com/ubuntu/ trusty-updates/main libroken18-heimdal amd64 1.6~git20131207+dfsg-1ubuntu1.2 [39.9 kB]
Get:2 http://archive.ubuntu.com/ubuntu/ trusty-updates/main libasn1-8-heimdal amd64 1.6~git20131207+dfsg-1ubuntu1.2 [160 kB]
Get:3 http://archive.ubuntu.com/ubuntu/ trusty-updates/main libkrb5support0 amd64 1.12+dfsg-2ubuntu5.4 [31.1 kB]
Get:4 http://archive.ubuntu.com/ubuntu/ trusty-updates/main libk5crypto3 amd64 1.12+dfsg-2ubuntu5.4 [79.4 kB]
Get:5 http://archive.ubuntu.com/ubuntu/ trusty/main libkeyutils1 amd64 1.5.6-1 [7318 B]
Get:6 http://archive.ubuntu.com/ubuntu/ trusty-updates/main libkrb5-3 amd64 1.12+dfsg-2ubuntu5.4 [262 kB]
Get:7 http://archive.ubuntu.com/ubuntu/ trusty-updates/main libgssapi-krb5-2 amd64 1.12+dfsg-2ubuntu5.4 [114 kB]
Get:8 http://archive.ubuntu.com/ubuntu/ trusty-updates/main libhcrypto4-heimdal amd64 1.6~git20131207+dfsg-1ubuntu1.2 [84.1 kB]
Get:9 http://archive.ubuntu.com/ubuntu/ trusty-updates/main libheimbase1-heimdal amd64 1.6~git20131207+dfsg-1ubuntu1.2 [29.0 kB]
Get:10 http://archive.ubuntu.com/ubuntu/ trusty-updates/main libwind0-heimdal amd64 1.6~git20131207+dfsg-1ubuntu1.2 [47.9 kB]
Get:11 http://archive.ubuntu.com/ubuntu/ trusty-updates/main libhx509-5-heimdal amd64 1.6~git20131207+dfsg-1ubuntu1.2 [104 kB]
Get:12 http://archive.ubuntu.com/ubuntu/ trusty-updates/main libkrb5-26-heimdal amd64 1.6~git20131207+dfsg-1ubuntu1.2 [196 kB]
Get:13 http://archive.ubuntu.com/ubuntu/ trusty-updates/main libheimntlm0-heimdal amd64 1.6~git20131207+dfsg-1ubuntu1.2 [15.2 kB]
Get:14 http://archive.ubuntu.com/ubuntu/ trusty-updates/main libgssapi3-heimdal amd64 1.6~git20131207+dfsg-1ubuntu1.2 [89.7 kB]
Get:15 http://archive.ubuntu.com/ubuntu/ trusty-updates/main libidn11 amd64 1.28-1ubuntu2.2 [94.6 kB]
Get:16 http://archive.ubuntu.com/ubuntu/ trusty/main libsasl2-modules-db amd64 2.1.25.dfsg1-17build1 [14.9 kB]
Get:17 http://archive.ubuntu.com/ubuntu/ trusty/main libsasl2-2 amd64 2.1.25.dfsg1-17build1 [56.5 kB]
Get:18 http://archive.ubuntu.com/ubuntu/ trusty-updates/main libldap-2.4-2 amd64 2.4.31-1+nmu2ubuntu8.5 [153 kB]
Get:19 http://archive.ubuntu.com/ubuntu/ trusty-updates/main librtmp0 amd64 2.4+20121230.gitdf6c518-1ubuntu0.1 [50.4 kB]
Get:20 http://archive.ubuntu.com/ubuntu/ trusty-updates/main libcurl3 amd64 7.35.0-1ubuntu2.20 [173 kB]
Get:21 http://archive.ubuntu.com/ubuntu/ trusty-updates/main openssl amd64 1.0.1f-1ubuntu2.27 [489 kB]
Get:22 http://archive.ubuntu.com/ubuntu/ trusty-updates/main ca-certificates all 20170717~14.04.2 [166 kB]
Get:23 http://archive.ubuntu.com/ubuntu/ trusty-updates/main krb5-locales all 1.12+dfsg-2ubuntu5.4 [14.0 kB]
Get:24 http://archive.ubuntu.com/ubuntu/ trusty/main libsasl2-modules amd64 2.1.25.dfsg1-17build1 [64.3 kB]
Get:25 http://archive.ubuntu.com/ubuntu/ trusty-updates/main curl amd64 7.35.0-1ubuntu2.20 [123 kB]
Fetched 2660 kB in 20s (132 kB/s)
Preconfiguring packages ...
Selecting previously unselected package libroken18-heimdal:amd64.
(Reading database ... 11585 files and directories currently installed.)
Preparing to unpack .../libroken18-heimdal_1.6~git20131207+dfsg-1ubuntu1.2_amd64.deb ...
Unpacking libroken18-heimdal:amd64 (1.6~git20131207+dfsg-1ubuntu1.2) ...
Selecting previously unselected package libasn1-8-heimdal:amd64.
Preparing to unpack .../libasn1-8-heimdal_1.6~git20131207+dfsg-1ubuntu1.2_amd64.deb ...
Unpacking libasn1-8-heimdal:amd64 (1.6~git20131207+dfsg-1ubuntu1.2) ...
Selecting previously unselected package libkrb5support0:amd64.
Preparing to unpack .../libkrb5support0_1.12+dfsg-2ubuntu5.4_amd64.deb ...
Unpacking libkrb5support0:amd64 (1.12+dfsg-2ubuntu5.4) ...
Selecting previously unselected package libk5crypto3:amd64.
Preparing to unpack .../libk5crypto3_1.12+dfsg-2ubuntu5.4_amd64.deb ...
Unpacking libk5crypto3:amd64 (1.12+dfsg-2ubuntu5.4) ...
Selecting previously unselected package libkeyutils1:amd64.
Preparing to unpack .../libkeyutils1_1.5.6-1_amd64.deb ...
Unpacking libkeyutils1:amd64 (1.5.6-1) ...
Selecting previously unselected package libkrb5-3:amd64.
Preparing to unpack .../libkrb5-3_1.12+dfsg-2ubuntu5.4_amd64.deb ...
Unpacking libkrb5-3:amd64 (1.12+dfsg-2ubuntu5.4) ...
Selecting previously unselected package libgssapi-krb5-2:amd64.
Preparing to unpack .../libgssapi-krb5-2_1.12+dfsg-2ubuntu5.4_amd64.deb ...
Unpacking libgssapi-krb5-2:amd64 (1.12+dfsg-2ubuntu5.4) ...
Selecting previously unselected package libhcrypto4-heimdal:amd64.
Preparing to unpack .../libhcrypto4-heimdal_1.6~git20131207+dfsg-1ubuntu1.2_amd64.deb ...
Unpacking libhcrypto4-heimdal:amd64 (1.6~git20131207+dfsg-1ubuntu1.2) ...
Selecting previously unselected package libheimbase1-heimdal:amd64.
Preparing to unpack .../libheimbase1-heimdal_1.6~git20131207+dfsg-1ubuntu1.2_amd64.deb ...
Unpacking libheimbase1-heimdal:amd64 (1.6~git20131207+dfsg-1ubuntu1.2) ...
Selecting previously unselected package libwind0-heimdal:amd64.
Preparing to unpack .../libwind0-heimdal_1.6~git20131207+dfsg-1ubuntu1.2_amd64.deb ...
Unpacking libwind0-heimdal:amd64 (1.6~git20131207+dfsg-1ubuntu1.2) ...
Selecting previously unselected package libhx509-5-heimdal:amd64.
Preparing to unpack .../libhx509-5-heimdal_1.6~git20131207+dfsg-1ubuntu1.2_amd64.deb ...
Unpacking libhx509-5-heimdal:amd64 (1.6~git20131207+dfsg-1ubuntu1.2) ...
Selecting previously unselected package libkrb5-26-heimdal:amd64.
Preparing to unpack .../libkrb5-26-heimdal_1.6~git20131207+dfsg-1ubuntu1.2_amd64.deb ...
Unpacking libkrb5-26-heimdal:amd64 (1.6~git20131207+dfsg-1ubuntu1.2) ...
Selecting previously unselected package libheimntlm0-heimdal:amd64.
Preparing to unpack .../libheimntlm0-heimdal_1.6~git20131207+dfsg-1ubuntu1.2_amd64.deb ...
Unpacking libheimntlm0-heimdal:amd64 (1.6~git20131207+dfsg-1ubuntu1.2) ...
Selecting previously unselected package libgssapi3-heimdal:amd64.
Preparing to unpack .../libgssapi3-heimdal_1.6~git20131207+dfsg-1ubuntu1.2_amd64.deb ...
Unpacking libgssapi3-heimdal:amd64 (1.6~git20131207+dfsg-1ubuntu1.2) ...
Selecting previously unselected package libidn11:amd64.
Preparing to unpack .../libidn11_1.28-1ubuntu2.2_amd64.deb ...
Unpacking libidn11:amd64 (1.28-1ubuntu2.2) ...
Selecting previously unselected package libsasl2-modules-db:amd64.
Preparing to unpack .../libsasl2-modules-db_2.1.25.dfsg1-17build1_amd64.deb ...
Unpacking libsasl2-modules-db:amd64 (2.1.25.dfsg1-17build1) ...
Selecting previously unselected package libsasl2-2:amd64.
Preparing to unpack .../libsasl2-2_2.1.25.dfsg1-17build1_amd64.deb ...
Unpacking libsasl2-2:amd64 (2.1.25.dfsg1-17build1) ...
Selecting previously unselected package libldap-2.4-2:amd64.
Preparing to unpack .../libldap-2.4-2_2.4.31-1+nmu2ubuntu8.5_amd64.deb ...
Unpacking libldap-2.4-2:amd64 (2.4.31-1+nmu2ubuntu8.5) ...
Selecting previously unselected package librtmp0:amd64.
Preparing to unpack .../librtmp0_2.4+20121230.gitdf6c518-1ubuntu0.1_amd64.deb ...
Unpacking librtmp0:amd64 (2.4+20121230.gitdf6c518-1ubuntu0.1) ...
Selecting previously unselected package libcurl3:amd64.
Preparing to unpack .../libcurl3_7.35.0-1ubuntu2.20_amd64.deb ...
Unpacking libcurl3:amd64 (7.35.0-1ubuntu2.20) ...
Selecting previously unselected package openssl.
Preparing to unpack .../openssl_1.0.1f-1ubuntu2.27_amd64.deb ...
Unpacking openssl (1.0.1f-1ubuntu2.27) ...
Selecting previously unselected package ca-certificates.
Preparing to unpack .../ca-certificates_20170717~14.04.2_all.deb ...
Unpacking ca-certificates (20170717~14.04.2) ...
Selecting previously unselected package krb5-locales.
Preparing to unpack .../krb5-locales_1.12+dfsg-2ubuntu5.4_all.deb ...
Unpacking krb5-locales (1.12+dfsg-2ubuntu5.4) ...
Selecting previously unselected package libsasl2-modules:amd64.
Preparing to unpack .../libsasl2-modules_2.1.25.dfsg1-17build1_amd64.deb ...
Unpacking libsasl2-modules:amd64 (2.1.25.dfsg1-17build1) ...
Selecting previously unselected package curl.
Preparing to unpack .../curl_7.35.0-1ubuntu2.20_amd64.deb ...
Unpacking curl (7.35.0-1ubuntu2.20) ...
Setting up libroken18-heimdal:amd64 (1.6~git20131207+dfsg-1ubuntu1.2) ...
Setting up libasn1-8-heimdal:amd64 (1.6~git20131207+dfsg-1ubuntu1.2) ...
Setting up libkrb5support0:amd64 (1.12+dfsg-2ubuntu5.4) ...
Setting up libk5crypto3:amd64 (1.12+dfsg-2ubuntu5.4) ...
Setting up libkeyutils1:amd64 (1.5.6-1) ...
Setting up libkrb5-3:amd64 (1.12+dfsg-2ubuntu5.4) ...
Setting up libgssapi-krb5-2:amd64 (1.12+dfsg-2ubuntu5.4) ...
Setting up libhcrypto4-heimdal:amd64 (1.6~git20131207+dfsg-1ubuntu1.2) ...
Setting up libheimbase1-heimdal:amd64 (1.6~git20131207+dfsg-1ubuntu1.2) ...
Setting up libwind0-heimdal:amd64 (1.6~git20131207+dfsg-1ubuntu1.2) ...
Setting up libhx509-5-heimdal:amd64 (1.6~git20131207+dfsg-1ubuntu1.2) ...
Setting up libkrb5-26-heimdal:amd64 (1.6~git20131207+dfsg-1ubuntu1.2) ...
Setting up libheimntlm0-heimdal:amd64 (1.6~git20131207+dfsg-1ubuntu1.2) ...
Setting up libgssapi3-heimdal:amd64 (1.6~git20131207+dfsg-1ubuntu1.2) ...
Setting up libidn11:amd64 (1.28-1ubuntu2.2) ...
Setting up libsasl2-modules-db:amd64 (2.1.25.dfsg1-17build1) ...
Setting up libsasl2-2:amd64 (2.1.25.dfsg1-17build1) ...
Setting up libldap-2.4-2:amd64 (2.4.31-1+nmu2ubuntu8.5) ...
Setting up librtmp0:amd64 (2.4+20121230.gitdf6c518-1ubuntu0.1) ...
Setting up libcurl3:amd64 (7.35.0-1ubuntu2.20) ...
Setting up openssl (1.0.1f-1ubuntu2.27) ...
Setting up ca-certificates (20170717~14.04.2) ...
Setting up krb5-locales (1.12+dfsg-2ubuntu5.4) ...
Setting up libsasl2-modules:amd64 (2.1.25.dfsg1-17build1) ...
Setting up curl (7.35.0-1ubuntu2.20) ...
Processing triggers for libc-bin (2.19-0ubuntu6.15) ...
Processing triggers for ca-certificates (20170717~14.04.2) ...
Updating certificates in /etc/ssl/certs... 148 added, 0 removed; done.
Running hooks in /etc/ca-certificates/update.d....done.
root@edc7c3a45581:/# curl --version
curl 7.35.0 (x86_64-pc-linux-gnu) libcurl/7.35.0 OpenSSL/1.0.1f zlib/1.2.8 libidn/1.28 librtmp/2.3
Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps pop3 pop3s rtmp rtsp smtp smtps telnet tftp
Features: AsynchDNS GSS-Negotiate IDN IPv6 Largefile NTLM NTLM_WB SSL libz TLS-SRP
root@edc7c3a45581:/#

Docker Networks

Docker Networks:
docker network ls
docker network inspect
docker network create --driver
docker network connect
docker network disconnect

Note:
(bridge) Defalt Docker virtual network is NATed with Host IP.
(host) It gains performance by skipping virtual networks and directly connectes the container to the Host interface, but sacrifies security of container model.
(none) Kind of equivalent of having an interface on your computer that's not attached to anything, but we can create our own.

PS C:\Users\MOHI\code> docker container ls
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
2a59253871ff nginx "nginx -g 'daemon of…" 2 hours ago Up 2 hours 0.0.0.0:80->80/tcp nginx_web
8c8313534019 mysql "docker-entrypoint.s…" 2 hours ago Up 2 hours 0.0.0.0:3306->3306/tcp, 33060/tcp mysql_db

// Checking the configured port for the container
PS C:\Users\MOHI\code> docker container port nginx_web
80/tcp -> 0.0.0.0:80

// Checking the IP address of the container:
PS C:\Users\MOHI\code> docker container inspect --format '{{ .NetworkSettings.IPAddress }}' nginx_web
172.17.0.3

PS C:\Users\MOHI\code> docker network ls
NETWORK ID NAME DRIVER SCOPE
981b5c0569a0 bridge bridge local
a77057e70878 host host local
cdcd8436ab53 none null local

PS C:\Users\MOHI> docker network inspect bridge
[
{
"Name": "bridge",
"Id": "981b5c0569a0035a7c05d3e7094060c9f631a195389fd8eee81e8bb3da4898a1",
"Created": "2019-11-03T17:53:31.7228006Z",
"Scope": "local",
"Driver": "bridge",
"EnableIPv6": false,
"IPAM": {
"Driver": "default",
"Options": null,
"Config": [
{
"Subnet": "172.17.0.0/16"
}
]
},
"Internal": false,
"Attachable": false,
"Ingress": false,
"ConfigFrom": {
"Network": ""
},
"ConfigOnly": false,
"Containers": {
"2a59253871ffed45115fc5d6778c7d5d24971dc3020c9f0a8bee551200b93466": {
"Name": "nginx_web",
"EndpointID": "21663238eb94c4af42e1bea175eed205b433ffab39b6067be6861a433fc629b1",
"MacAddress": "02:42:ac:11:00:03",
"IPv4Address": "172.17.0.3/16",
"IPv6Address": ""
},
"8c83135340196a58031c7cca0012c83938b72d31851a10d920863e82e588caf2": {
"Name": "mysql_db",
"EndpointID": "e4fd935517985d081fe9c5bd7af39bfeb5ed712009286e8d8b5e8d1967f8f2a8",
"MacAddress": "02:42:ac:11:00:02",
"IPv4Address": "172.17.0.2/16",
"IPv6Address": ""
}
},
"Options": {
"com.docker.network.bridge.default_bridge": "true",
"com.docker.network.bridge.enable_icc": "true",
"com.docker.network.bridge.enable_ip_masquerade": "true",
"com.docker.network.bridge.host_binding_ipv4": "0.0.0.0",
"com.docker.network.bridge.name": "docker0",
"com.docker.network.driver.mtu": "1500"
},
"Labels": {}
}
]

// Creating a new Docker network:
PS C:\Users\MOHI> docker network create my_app_net
60095a7d865da0b55404ed123c8b0ed44cc99fb1c9af6b91ce40bf82d393f418

PS C:\Users\MOHI> docker network ls
NETWORK ID NAME DRIVER SCOPE
981b5c0569a0 bridge bridge local
a77057e70878 host host local
60095a7d865d my_app_net bridge local
cdcd8436ab53 none null local

Note: The new Docker network (my_app_net) is using the "bridge" driver

PS C:\Users\MOHI> docker network create --help

Usage: docker network create [OPTIONS] NETWORK

Create a network

Options:
--attachable Enable manual container attachment
--aux-address map Auxiliary IPv4 or IPv6 addresses used by
Network driver (default map[])
--config-from string The network from which copying the configuration
--config-only Create a configuration only network
-d, --driver string Driver to manage the Network (default "bridge")
--gateway strings IPv4 or IPv6 Gateway for the master subnet
--ingress Create swarm routing-mesh network
--internal Restrict external access to the network
--ip-range strings Allocate container ip from a sub-range
--ipam-driver string IP Address Management Driver (default "default")
--ipam-opt map Set IPAM driver specific options (default map[])
--ipv6 Enable IPv6 networking
--label list Set metadata on a network
-o, --opt map Set driver specific options (default map[])
--scope string Control the network's scope
--subnet strings Subnet in CIDR format that represents a
network segment

PS C:\Users\MOHI> docker network inspect my_app_net
[
{
"Name": "my_app_net",
"Id": "60095a7d865da0b55404ed123c8b0ed44cc99fb1c9af6b91ce40bf82d393f418",
"Created": "2019-11-07T15:38:45.9824155Z",
"Scope": "local",
"Driver": "bridge",
"EnableIPv6": false,
"IPAM": {
"Driver": "default",
"Options": {},
"Config": [
{
"Subnet": "172.18.0.0/16",
"Gateway": "172.18.0.1"
}
]
},
"Internal": false,
"Attachable": false,
"Ingress": false,
"ConfigFrom": {
"Network": ""
},
"ConfigOnly": false,
"Containers": {},
"Options": {},
"Labels": {}
}
]

// Creating a new container with virtual network option:
PS C:\Users\MOHI> docker container run -d --name new_nginx --network my_app_net nginx
872f240ce4928764c69bee37a69677c4e06fc12e0110f0c68c1d7cda705b6b11

PS C:\Users\MOHI> docker container ls
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
872f240ce492 nginx "nginx -g 'daemon of…" 40 seconds ago Up 37 seconds 80/tcp new_nginx
2a59253871ff nginx "nginx -g 'daemon of…" 4 hours ago Up 4 hours 0.0.0.0:80->80/tcp nginx_web
8c8313534019 mysql "docker-entrypoint.s…" 4 hours ago Up 4 hours 0.0.0.0:3306->3306/tcp, 33060/tcp mysql_db

PS C:\Users\MOHI> docker network inspect my_app_net
[
{
"Name": "my_app_net",
"Id": "60095a7d865da0b55404ed123c8b0ed44cc99fb1c9af6b91ce40bf82d393f418",
"Created": "2019-11-07T15:38:45.9824155Z",
"Scope": "local",
"Driver": "bridge",
"EnableIPv6": false,
"IPAM": {
"Driver": "default",
"Options": {},
"Config": [
{
"Subnet": "172.18.0.0/16",
"Gateway": "172.18.0.1"
}
]
},
"Internal": false,
"Attachable": false,
"Ingress": false,
"ConfigFrom": {
"Network": ""
},
"ConfigOnly": false,
"Containers": {
"872f240ce4928764c69bee37a69677c4e06fc12e0110f0c68c1d7cda705b6b11": {
"Name": "new_nginx",
"EndpointID": "8b78c2ff891147b1772e5d3b6d2e2de4cb14b831a75c32a018d9bb6d123a21b5",
"MacAddress": "02:42:ac:12:00:02",
"IPv4Address": "172.18.0.2/16",
"IPv6Address": ""
}
},
"Options": {},
"Labels": {}
}
]

PS C:\Users\MOHI> docker network --help

Usage: docker network COMMAND

Manage networks

Commands:
connect Connect a container to a network
create Create a network
disconnect Disconnect a container from a network
inspect Display detailed information on one or more networks
ls List networks
prune Remove all unused networks
rm Remove one or more networks

Run 'docker network COMMAND --help' for more information on a command.

//Docker network connect:
Note: Dynamically creates a NIC in the container on an existing virtual network.

PS C:\Users\MOHI> docker network ls
NETWORK ID NAME DRIVER SCOPE
981b5c0569a0 bridge bridge local
a77057e70878 host host local
60095a7d865d my_app_net bridge local
cdcd8436ab53 none null local

docker network connect {newly created nw id} {container id)
docker network connect 60095a7d865d 2a59253871ff

PS C:\Users\MOHI> docker container inspect nginx_web
[
{
"Id": "2a59253871ffed45115fc5d6778c7d5d24971dc3020c9f0a8bee551200b93466",
"Created": "2019-11-07T12:11:17.0763598Z",
"Path": "nginx",
"Args": [
"-g",
"daemon off;"
],
"State": {
"Status": "running",
"Running": true,
"Paused": false,
"Restarting": false,
"OOMKilled": false,
"Dead": false,
"Pid": 4415,
"ExitCode": 0,
"Error": "",
"StartedAt": "2019-11-07T12:11:21.8310527Z",
"FinishedAt": "0001-01-01T00:00:00Z"
},
"Image": "sha256:540a289bab6cb1bf880086a9b803cf0c4cefe38cbb5cdefa199b69614525199f",
"ResolvConfPath": "/var/lib/docker/containers/2a59253871ffed45115fc5d6778c7d5d24971dc3020c9f0a8bee551200b93466/resolv.conf",
"HostnamePath": "/var/lib/docker/containers/2a59253871ffed45115fc5d6778c7d5d24971dc3020c9f0a8bee551200b93466/hostname",
"HostsPath": "/var/lib/docker/containers/2a59253871ffed45115fc5d6778c7d5d24971dc3020c9f0a8bee551200b93466/hosts",
"LogPath": "/var/lib/docker/containers/2a59253871ffed45115fc5d6778c7d5d24971dc3020c9f0a8bee551200b93466/2a59253871ffed45115fc5d6778c7d5d24971dc3020c9f0a8bee551200b93466-json.log",
"Name": "/nginx_web",
"RestartCount": 0,
"Driver": "overlay2",
"Platform": "linux",
"MountLabel": "",
"ProcessLabel": "",
"AppArmorProfile": "",
"ExecIDs": null,
"HostConfig": {
"Binds": null,
"ContainerIDFile": "",
"LogConfig": {
"Type": "json-file",
"Config": {}
},
"NetworkMode": "default",
"PortBindings": {
"80/tcp": [
{
"HostIp": "",
"HostPort": "80"
}
]
},
"RestartPolicy": {
"Name": "no",
"MaximumRetryCount": 0
},
"AutoRemove": false,
"VolumeDriver": "",
"VolumesFrom": null,
"CapAdd": null,
"CapDrop": null,
"Capabilities": null,
"Dns": [],
"DnsOptions": [],
"DnsSearch": [],
"ExtraHosts": null,
"GroupAdd": null,
"IpcMode": "private",
"Cgroup": "",
"Links": null,
"OomScoreAdj": 0,
"PidMode": "",
"Privileged": false,
"PublishAllPorts": false,
"ReadonlyRootfs": false,
"SecurityOpt": null,
"UTSMode": "",
"UsernsMode": "",
"ShmSize": 67108864,
"Runtime": "runc",
"ConsoleSize": [
50,
120
],
"Isolation": "",
"CpuShares": 0,
"Memory": 0,
"NanoCpus": 0,
"CgroupParent": "",
"BlkioWeight": 0,
"BlkioWeightDevice": [],
"BlkioDeviceReadBps": null,
"BlkioDeviceWriteBps": null,
"BlkioDeviceReadIOps": null,
"BlkioDeviceWriteIOps": null,
"CpuPeriod": 0,
"CpuQuota": 0,
"CpuRealtimePeriod": 0,
"CpuRealtimeRuntime": 0,
"CpusetCpus": "",
"CpusetMems": "",
"Devices": [],
"DeviceCgroupRules": null,
"DeviceRequests": null,
"KernelMemory": 0,
"KernelMemoryTCP": 0,
"MemoryReservation": 0,
"MemorySwap": 0,
"MemorySwappiness": null,
"OomKillDisable": false,
"PidsLimit": null,
"Ulimits": null,
"CpuCount": 0,
"CpuPercent": 0,
"IOMaximumIOps": 0,
"IOMaximumBandwidth": 0,
"MaskedPaths": [
"/proc/asound",
"/proc/acpi",
"/proc/kcore",
"/proc/keys",
"/proc/latency_stats",
"/proc/timer_list",
"/proc/timer_stats",
"/proc/sched_debug",
"/proc/scsi",
"/sys/firmware"
],
"ReadonlyPaths": [
"/proc/bus",
"/proc/fs",
"/proc/irq",
"/proc/sys",
"/proc/sysrq-trigger"
]
},
"GraphDriver": {
"Data": {
"LowerDir": "/var/lib/docker/overlay2/21a32567dcfff9817453d9efdb9dd3b7fc8c0eba1cd62560ef975e08a85e3a9c-init/diff:/var/lib/docker/overlay2/08b90638737e516cb36bc344eed1af3b3031e37b47364996b51d8c3014380d9a/diff:/var/lib/docker/overlay2/64cfd2d2aebaa6155623792ba07ab098a755c9be60783bc93acd429352a01991/diff:/var/lib/docker/overlay2/6d7637e12181a5a3d9dd5250a2d6e04dec26d0e361bf118d6d494557d22095d3/diff",
"MergedDir": "/var/lib/docker/overlay2/21a32567dcfff9817453d9efdb9dd3b7fc8c0eba1cd62560ef975e08a85e3a9c/merged",
"UpperDir": "/var/lib/docker/overlay2/21a32567dcfff9817453d9efdb9dd3b7fc8c0eba1cd62560ef975e08a85e3a9c/diff",
"WorkDir": "/var/lib/docker/overlay2/21a32567dcfff9817453d9efdb9dd3b7fc8c0eba1cd62560ef975e08a85e3a9c/work"
},
"Name": "overlay2"
},
"Mounts": [],
"Config": {
"Hostname": "2a59253871ff",
"Domainname": "",
"User": "",
"AttachStdin": false,
"AttachStdout": false,
"AttachStderr": false,
"ExposedPorts": {
"80/tcp": {}
},
"Tty": false,
"OpenStdin": false,
"StdinOnce": false,
"Env": [
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
"NGINX_VERSION=1.17.5",
"NJS_VERSION=0.3.6",
"PKG_RELEASE=1~buster"
],
"Cmd": [
"nginx",
"-g",
"daemon off;"
],
"Image": "nginx",
"Volumes": null,
"WorkingDir": "",
"Entrypoint": null,
"OnBuild": null,
"Labels": {
"maintainer": "NGINX Docker Maintainers <docker-maint@nginx.com>"
},
"StopSignal": "SIGTERM"
},
"NetworkSettings": {
"Bridge": "",
"SandboxID": "7ec0248663c9475baca243426089563c22a0b1039e778e69df0d667c38cdfc66",
"HairpinMode": false,
"LinkLocalIPv6Address": "",
"LinkLocalIPv6PrefixLen": 0,
"Ports": {
"80/tcp": [
{
"HostIp": "0.0.0.0",
"HostPort": "80"
}
]
},
"SandboxKey": "/var/run/docker/netns/7ec0248663c9",
"SecondaryIPAddresses": null,
"SecondaryIPv6Addresses": null,
"EndpointID": "21663238eb94c4af42e1bea175eed205b433ffab39b6067be6861a433fc629b1",
"Gateway": "172.17.0.1",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"IPAddress": "172.17.0.3",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"MacAddress": "02:42:ac:11:00:03",
"Networks": {
"bridge": {
"IPAMConfig": null,
"Links": null,
"Aliases": null,
"NetworkID": "981b5c0569a0035a7c05d3e7094060c9f631a195389fd8eee81e8bb3da4898a1",
"EndpointID": "21663238eb94c4af42e1bea175eed205b433ffab39b6067be6861a433fc629b1",
"Gateway": "172.17.0.1",
"IPAddress": "172.17.0.3",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"MacAddress": "02:42:ac:11:00:03",
"DriverOpts": null
},
"my_app_net": {
"IPAMConfig": {},
"Links": null,
"Aliases": [
"2a59253871ff"
],
"NetworkID": "60095a7d865da0b55404ed123c8b0ed44cc99fb1c9af6b91ce40bf82d393f418",
"EndpointID": "8ee15c7ef28cb4fb0265bcf8d844290bca04ec414008d2999b08a3ec2ef9eb10",
"Gateway": "172.18.0.1",
"IPAddress": "172.18.0.3",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"MacAddress": "02:42:ac:12:00:03",
"DriverOpts": {}
}
}
}
}
]

Note: Now we can see that this nginx_web container has two different networks (bridge and my_app_net) and different IPs (172.17.0.3 and 172.18.0.3).

Docker network disconnect:
Dynamically remove a NIC from a container on a specific virtual network:

PS C:\Users\MOHI> docker network disconnect 60095a7d865d 2a59253871ff
PS C:\Users\MOHI> docker container inspect nginx_web
[
{
"Id": "2a59253871ffed45115fc5d6778c7d5d24971dc3020c9f0a8bee551200b93466",
"Created": "2019-11-07T12:11:17.0763598Z",
"Path": "nginx",
"Args": [
"-g",
"daemon off;"
],
"State": {
"Status": "running",
"Running": true,
"Paused": false,
"Restarting": false,
"OOMKilled": false,
"Dead": false,
"Pid": 4415,
"ExitCode": 0,
"Error": "",
"StartedAt": "2019-11-07T12:11:21.8310527Z",
"FinishedAt": "0001-01-01T00:00:00Z"
},
"Image": "sha256:540a289bab6cb1bf880086a9b803cf0c4cefe38cbb5cdefa199b69614525199f",
"ResolvConfPath": "/var/lib/docker/containers/2a59253871ffed45115fc5d6778c7d5d24971dc3020c9f0a8bee551200b93466/resolv.conf",
"HostnamePath": "/var/lib/docker/containers/2a59253871ffed45115fc5d6778c7d5d24971dc3020c9f0a8bee551200b93466/hostname",
"HostsPath": "/var/lib/docker/containers/2a59253871ffed45115fc5d6778c7d5d24971dc3020c9f0a8bee551200b93466/hosts",
"LogPath": "/var/lib/docker/containers/2a59253871ffed45115fc5d6778c7d5d24971dc3020c9f0a8bee551200b93466/2a59253871ffed45115fc5d6778c7d5d24971dc3020c9f0a8bee551200b93466-json.log",
"Name": "/nginx_web",
"RestartCount": 0,
"Driver": "overlay2",
"Platform": "linux",
"MountLabel": "",
"ProcessLabel": "",
"AppArmorProfile": "",
"ExecIDs": null,
"HostConfig": {
"Binds": null,
"ContainerIDFile": "",
"LogConfig": {
"Type": "json-file",
"Config": {}
},
"NetworkMode": "default",
"PortBindings": {
"80/tcp": [
{
"HostIp": "",
"HostPort": "80"
}
]
},
"RestartPolicy": {
"Name": "no",
"MaximumRetryCount": 0
},
"AutoRemove": false,
"VolumeDriver": "",
"VolumesFrom": null,
"CapAdd": null,
"CapDrop": null,
"Capabilities": null,
"Dns": [],
"DnsOptions": [],
"DnsSearch": [],
"ExtraHosts": null,
"GroupAdd": null,
"IpcMode": "private",
"Cgroup": "",
"Links": null,
"OomScoreAdj": 0,
"PidMode": "",
"Privileged": false,
"PublishAllPorts": false,
"ReadonlyRootfs": false,
"SecurityOpt": null,
"UTSMode": "",
"UsernsMode": "",
"ShmSize": 67108864,
"Runtime": "runc",
"ConsoleSize": [
50,
120
],
"Isolation": "",
"CpuShares": 0,
"Memory": 0,
"NanoCpus": 0,
"CgroupParent": "",
"BlkioWeight": 0,
"BlkioWeightDevice": [],
"BlkioDeviceReadBps": null,
"BlkioDeviceWriteBps": null,
"BlkioDeviceReadIOps": null,
"BlkioDeviceWriteIOps": null,
"CpuPeriod": 0,
"CpuQuota": 0,
"CpuRealtimePeriod": 0,
"CpuRealtimeRuntime": 0,
"CpusetCpus": "",
"CpusetMems": "",
"Devices": [],
"DeviceCgroupRules": null,
"DeviceRequests": null,
"KernelMemory": 0,
"KernelMemoryTCP": 0,
"MemoryReservation": 0,
"MemorySwap": 0,
"MemorySwappiness": null,
"OomKillDisable": false,
"PidsLimit": null,
"Ulimits": null,
"CpuCount": 0,
"CpuPercent": 0,
"IOMaximumIOps": 0,
"IOMaximumBandwidth": 0,
"MaskedPaths": [
"/proc/asound",
"/proc/acpi",
"/proc/kcore",
"/proc/keys",
"/proc/latency_stats",
"/proc/timer_list",
"/proc/timer_stats",
"/proc/sched_debug",
"/proc/scsi",
"/sys/firmware"
],
"ReadonlyPaths": [
"/proc/bus",
"/proc/fs",
"/proc/irq",
"/proc/sys",
"/proc/sysrq-trigger"
]
},
"GraphDriver": {
"Data": {
"LowerDir": "/var/lib/docker/overlay2/21a32567dcfff9817453d9efdb9dd3b7fc8c0eba1cd62560ef975e08a85e3a9c-init/diff:/var/lib/docker/overlay2/08b90638737e516cb36bc344eed1af3b3031e37b47364996b51d8c3014380d9a/diff:/var/lib/docker/overlay2/64cfd2d2aebaa6155623792ba07ab098a755c9be60783bc93acd429352a01991/diff:/var/lib/docker/overlay2/6d7637e12181a5a3d9dd5250a2d6e04dec26d0e361bf118d6d494557d22095d3/diff",
"MergedDir": "/var/lib/docker/overlay2/21a32567dcfff9817453d9efdb9dd3b7fc8c0eba1cd62560ef975e08a85e3a9c/merged",
"UpperDir": "/var/lib/docker/overlay2/21a32567dcfff9817453d9efdb9dd3b7fc8c0eba1cd62560ef975e08a85e3a9c/diff",
"WorkDir": "/var/lib/docker/overlay2/21a32567dcfff9817453d9efdb9dd3b7fc8c0eba1cd62560ef975e08a85e3a9c/work"
},
"Name": "overlay2"
},
"Mounts": [],
"Config": {
"Hostname": "2a59253871ff",
"Domainname": "",
"User": "",
"AttachStdin": false,
"AttachStdout": false,
"AttachStderr": false,
"ExposedPorts": {
"80/tcp": {}
},
"Tty": false,
"OpenStdin": false,
"StdinOnce": false,
"Env": [
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
"NGINX_VERSION=1.17.5",
"NJS_VERSION=0.3.6",
"PKG_RELEASE=1~buster"
],
"Cmd": [
"nginx",
"-g",
"daemon off;"
],
"Image": "nginx",
"Volumes": null,
"WorkingDir": "",
"Entrypoint": null,
"OnBuild": null,
"Labels": {
"maintainer": "NGINX Docker Maintainers <docker-maint@nginx.com>"
},
"StopSignal": "SIGTERM"
},
"NetworkSettings": {
"Bridge": "",
"SandboxID": "7ec0248663c9475baca243426089563c22a0b1039e778e69df0d667c38cdfc66",
"HairpinMode": false,
"LinkLocalIPv6Address": "",
"LinkLocalIPv6PrefixLen": 0,
"Ports": {
"80/tcp": [
{
"HostIp": "0.0.0.0",
"HostPort": "80"
}
]
},
"SandboxKey": "/var/run/docker/netns/7ec0248663c9",
"SecondaryIPAddresses": null,
"SecondaryIPv6Addresses": null,
"EndpointID": "21663238eb94c4af42e1bea175eed205b433ffab39b6067be6861a433fc629b1",
"Gateway": "172.17.0.1",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"IPAddress": "172.17.0.3",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"MacAddress": "02:42:ac:11:00:03",
"Networks": {
"bridge": {
"IPAMConfig": null,
"Links": null,
"Aliases": null,
"NetworkID": "981b5c0569a0035a7c05d3e7094060c9f631a195389fd8eee81e8bb3da4898a1",
"EndpointID": "21663238eb94c4af42e1bea175eed205b433ffab39b6067be6861a433fc629b1",
"Gateway": "172.17.0.1",
"IPAddress": "172.17.0.3",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"MacAddress": "02:42:ac:11:00:03",
"DriverOpts": null
}
}
}
}
]

Note: Now we can see that 172.18.0.3 (my_app_net) has been removed for nginx_web

Docker networks DNS:
Note:
Docker daemon has a built-in DNS server that containers use by default.
Containers shouldn't rely on IP's for inter-communication.

PS C:\Users\MOHI> docker container ls
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
872f240ce492 nginx "nginx -g 'daemon of…" 36 minutes ago Up 36 minutes 80/tcp new_nginx
2a59253871ff nginx "nginx -g 'daemon of…" 4 hours ago Up 4 hours 0.0.0.0:80->80/tcp nginx_web
8c8313534019 mysql "docker-entrypoint.s…" 4 hours ago Up 4 hours 0.0.0.0:3306->3306/tcp, 33060/tcp mysql_db

PS C:\Users\MOHI> docker network inspect my_app_net
[
{
"Name": "my_app_net",
"Id": "60095a7d865da0b55404ed123c8b0ed44cc99fb1c9af6b91ce40bf82d393f418",
"Created": "2019-11-07T15:38:45.9824155Z",
"Scope": "local",
"Driver": "bridge",
"EnableIPv6": false,
"IPAM": {
"Driver": "default",
"Options": {},
"Config": [
{
"Subnet": "172.18.0.0/16",
"Gateway": "172.18.0.1"
}
]
},
"Internal": false,
"Attachable": false,
"Ingress": false,
"ConfigFrom": {
"Network": ""
},
"ConfigOnly": false,
"Containers": {
"872f240ce4928764c69bee37a69677c4e06fc12e0110f0c68c1d7cda705b6b11": {
"Name": "new_nginx",
"EndpointID": "8b78c2ff891147b1772e5d3b6d2e2de4cb14b831a75c32a018d9bb6d123a21b5",
"MacAddress": "02:42:ac:12:00:02",
"IPv4Address": "172.18.0.2/16",
"IPv6Address": ""
}
},
"Options": {},
"Labels": {}
}
]

Note: DNS default names, Docker defaults the hostname to the container's name, but you can also set aliases

// Creating new container "my_nginx_new" (We are using alpine linux based nginx here since we need a "ping" command to work:

PS C:\Users\MOHI> docker container run -d --name my_nginx_alpine --network my_app_net nginx:alpine
Unable to find image 'nginx:alpine' locally
alpine: Pulling from library/nginx
89d9c30c1d48: Already exists
110ad692b782: Pull complete
Digest: sha256:085e84650dbe56f27ca3ed00063a12d5b486e40c3d16d83c4e6c2aad1e4045ab
Status: Downloaded newer image for nginx:alpine
64f0dba4ea987ae614310cef046f2d1032ef86d089a4f9d66a777b77b09cd00b

PS C:\Users\MOHI> docker network inspect my_app_net
[
{
"Name": "my_app_net",
"Id": "60095a7d865da0b55404ed123c8b0ed44cc99fb1c9af6b91ce40bf82d393f418",
"Created": "2019-11-07T15:38:45.9824155Z",
"Scope": "local",
"Driver": "bridge",
"EnableIPv6": false,
"IPAM": {
"Driver": "default",
"Options": {},
"Config": [
{
"Subnet": "172.18.0.0/16",
"Gateway": "172.18.0.1"
}
]
},
"Internal": false,
"Attachable": false,
"Ingress": false,
"ConfigFrom": {
"Network": ""
},
"ConfigOnly": false,
"Containers": {
"3cac4f533443bea5f1919acf3b0297e00b947d679bc2429f5ef596be61725245": {
"Name": "my_nginx",
"EndpointID": "eb8b0dacc10542cf1bc305df8cfb1eddf7964ce48f5f4f3a23db01e3d247b26b",
"MacAddress": "02:42:ac:12:00:03",
"IPv4Address": "172.18.0.3/16",
"IPv6Address": ""
},
"64f0dba4ea987ae614310cef046f2d1032ef86d089a4f9d66a777b77b09cd00b": {
"Name": "my_nginx_alpine",
"EndpointID": "302b5679b9431bb4ed0faed713c1cc766be4e446b0520d552bf4e9e08f8c9747",
"MacAddress": "02:42:ac:12:00:04",
"IPv4Address": "172.18.0.4/16",
"IPv6Address": ""
},
"872f240ce4928764c69bee37a69677c4e06fc12e0110f0c68c1d7cda705b6b11": {
"Name": "new_nginx",
"EndpointID": "8b78c2ff891147b1772e5d3b6d2e2de4cb14b831a75c32a018d9bb6d123a21b5",
"MacAddress": "02:42:ac:12:00:02",
"IPv4Address": "172.18.0.2/16",
"IPv6Address": ""
}
},
"Options": {},
"Labels": {}
}
]

Note: Now we can see new container (my_nginx_alpine). We can ping a same networks container by using it name.

PS C:\Users\MOHI> docker container exec -it my_nginx_alpine ping new_nginx
PING new_nginx (172.18.0.2): 56 data bytes
64 bytes from 172.18.0.2: seq=0 ttl=64 time=0.103 ms
64 bytes from 172.18.0.2: seq=1 ttl=64 time=0.188 ms
64 bytes from 172.18.0.2: seq=2 ttl=64 time=0.192 ms
64 bytes from 172.18.0.2: seq=3 ttl=64 time=0.196 ms
64 bytes from 172.18.0.2: seq=4 ttl=64 time=0.190 ms
64 bytes from 172.18.0.2: seq=5 ttl=64 time=0.187 ms
^C
--- new_nginx ping statistics ---
6 packets transmitted, 6 packets received, 0% packet loss
round-trip min/avg/max = 0.103/0.176/0.196 ms

Now we can see that DNS resolution is works fine.

Getting a shell inside containers

Getting a shell inside containers:
Note: SSH is not needed since Dockers "cli" is great substitute for SSH in containers.

docker container run -it -> start the container interactively
docker container exec -it -> run additional command in existing container
Installing different Linux Distros in containers (Eg: Ubuntu and Alpine)

PS C:\Users\MOHI\code> docker container run -it --name nginx_proxy nginx bash // "-it" option is for interactive and allocate pseudo tty, "bash" is the shell (command) to run after the container initialization
root@6b2de0d681de:/# ls -al
total 72
drwxr-xr-x 1 root root 4096 Nov 7 12:24 .
drwxr-xr-x 1 root root 4096 Nov 7 12:24 ..
-rwxr-xr-x 1 root root 0 Nov 7 12:24 .dockerenv
drwxr-xr-x 2 root root 4096 Oct 14 00:00 bin
drwxr-xr-x 2 root root 4096 Aug 30 12:31 boot
drwxr-xr-x 5 root root 360 Nov 7 12:25 dev
drwxr-xr-x 1 root root 4096 Nov 7 12:24 etc
drwxr-xr-x 2 root root 4096 Aug 30 12:31 home
drwxr-xr-x 1 root root 4096 Oct 23 00:25 lib
drwxr-xr-x 2 root root 4096 Oct 14 00:00 lib64
drwxr-xr-x 2 root root 4096 Oct 14 00:00 media
drwxr-xr-x 2 root root 4096 Oct 14 00:00 mnt
drwxr-xr-x 2 root root 4096 Oct 14 00:00 opt
dr-xr-xr-x 150 root root 0 Nov 7 12:24 proc
drwx------ 2 root root 4096 Oct 14 00:00 root
drwxr-xr-x 3 root root 4096 Oct 14 00:00 run
drwxr-xr-x 2 root root 4096 Oct 14 00:00 sbin
drwxr-xr-x 2 root root 4096 Oct 14 00:00 srv
dr-xr-xr-x 13 root root 0 Nov 7 12:24 sys
drwxrwxrwt 1 root root 4096 Oct 23 00:25 tmp
drwxr-xr-x 1 root root 4096 Oct 14 00:00 usr
drwxr-xr-x 1 root root 4096 Oct 14 00:00 var

root@6b2de0d681de:/# exit // Come out of container
exit
PS C:\Users\MOHI\code>

PS C:\Users\MOHI\code> docker container ls // See that newly created container is not active, since we have set the command "bash" in the command line and ran "exit" inside the container hence it simply quit it.
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
2a59253871ff nginx "nginx -g 'daemon of…" 18 minutes ago Up 18 minutes 0.0.0.0:80->80/tcp nginx_web
8c8313534019 mysql "docker-entrypoint.s…" 18 minutes ago Up 18 minutes 0.0.0.0:3306->3306/tcp, 33060/tcp mysql_db

PS C:\Users\MOHI\code> docker container ls -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
6b2de0d681de nginx "bash" 5 minutes ago Exited (0) About a minute ago nginx_proxy
2a59253871ff nginx "nginx -g 'daemon of…" 19 minutes ago Up 19 minutes 0.0.0.0:80->80/tcp nginx_web
8c8313534019 mysql "docker-entrypoint.s…" 19 minutes ago Up 19 minutes 0.0.0.0:3306->3306/tcp, 33060/tcp mysql_db

Note: Container can run as long as the command that run during start-up, ""nginx -g 'daemon of…" vs "bash"

What if we used full distribution of "Linux (Ubuntu)" instead of actually doing the "nginx"

PS C:\Users\MOHI\code> docker container run -it --name ubuntu_full ubuntu // It's default CMD is "bash" so we no need to set it here and it will automatically come into "bash" prompt.
Unable to find image 'ubuntu:latest' locally
latest: Pulling from library/ubuntu
7ddbc47eeb70: Pull complete
c1bbdc448b72: Pull complete
8c3b70e39044: Pull complete
45d437916d57: Pull complete
Digest: sha256:6e9f67fa63b0323e9a1e587fd71c561ba48a034504fb804fd26fd8800039835d
Status: Downloaded newer image for ubuntu:latest
root@310f22c574d3:/#

// Retrieve new lists of packages:
root@310f22c574d3:/# apt-get update
Get:1 http://security.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB]
Get:2 http://archive.ubuntu.com/ubuntu bionic InRelease [242 kB]
Get:3 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages [700 kB]
Get:4 http://archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]
Get:5 http://archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB]
Get:6 http://archive.ubuntu.com/ubuntu bionic/universe amd64 Packages [11.3 MB]
Get:7 http://security.ubuntu.com/ubuntu bionic-security/universe amd64 Packages [783 kB]
Get:8 http://security.ubuntu.com/ubuntu bionic-security/multiverse amd64 Packages [5944 B]
Get:9 http://security.ubuntu.com/ubuntu bionic-security/restricted amd64 Packages [12.6 kB]
Get:10 http://archive.ubuntu.com/ubuntu bionic/multiverse amd64 Packages [186 kB]
Get:11 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages [1344 kB]
Get:12 http://archive.ubuntu.com/ubuntu bionic/restricted amd64 Packages [13.5 kB]
Get:13 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages [996 kB]
Get:14 http://archive.ubuntu.com/ubuntu bionic-updates/multiverse amd64 Packages [9022 B]
Get:15 http://archive.ubuntu.com/ubuntu bionic-updates/universe amd64 Packages [1309 kB]
Get:16 http://archive.ubuntu.com/ubuntu bionic-updates/restricted amd64 Packages [23.2 kB]
Get:17 http://archive.ubuntu.com/ubuntu bionic-backports/main amd64 Packages [2496 B]
Get:18 http://archive.ubuntu.com/ubuntu bionic-backports/universe amd64 Packages [4234 B]
Fetched 17.2 MB in 58s (295 kB/s)
Reading package lists... Done

// Install a package "curl":
root@310f22c574d3:/# apt-get install -y curl
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
ca-certificates krb5-locales libasn1-8-heimdal libcurl4 libgssapi-krb5-2 libgssapi3-heimdal libhcrypto4-heimdal libheimbase1-heimdal libheimntlm0-heimdal libhx509-5-heimdal libk5crypto3 libkeyutils1 libkrb5-26-heimdal
libkrb5-3 libkrb5support0 libldap-2.4-2 libldap-common libnghttp2-14 libpsl5 libroken18-heimdal librtmp1 libsasl2-2 libsasl2-modules libsasl2-modules-db libsqlite3-0 libssl1.1 libwind0-heimdal openssl publicsuffix
Suggested packages:
krb5-doc krb5-user libsasl2-modules-gssapi-mit | libsasl2-modules-gssapi-heimdal libsasl2-modules-ldap libsasl2-modules-otp libsasl2-modules-sql
The following NEW packages will be installed:
ca-certificates curl krb5-locales libasn1-8-heimdal libcurl4 libgssapi-krb5-2 libgssapi3-heimdal libhcrypto4-heimdal libheimbase1-heimdal libheimntlm0-heimdal libhx509-5-heimdal libk5crypto3 libkeyutils1 libkrb5-26-heimdal
libkrb5-3 libkrb5support0 libldap-2.4-2 libldap-common libnghttp2-14 libpsl5 libroken18-heimdal librtmp1 libsasl2-2 libsasl2-modules libsasl2-modules-db libsqlite3-0 libssl1.1 libwind0-heimdal openssl publicsuffix
0 upgraded, 30 newly installed, 0 to remove and 0 not upgraded.
Need to get 4834 kB of archives.
After this operation, 14.8 MB of additional disk space will be used.
Get:1 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libssl1.1 amd64 1.1.1-1ubuntu2.1~18.04.4 [1300 kB]
Get:2 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 openssl amd64 1.1.1-1ubuntu2.1~18.04.4 [613 kB]
Get:3 http://archive.ubuntu.com/ubuntu bionic/main amd64 ca-certificates all 20180409 [151 kB]
Get:4 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libsqlite3-0 amd64 3.22.0-1ubuntu0.1 [497 kB]
Get:5 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 krb5-locales all 1.16-2ubuntu0.1 [13.5 kB]
Get:6 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libkrb5support0 amd64 1.16-2ubuntu0.1 [30.9 kB]
Get:7 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libk5crypto3 amd64 1.16-2ubuntu0.1 [85.6 kB]
Get:8 http://archive.ubuntu.com/ubuntu bionic/main amd64 libkeyutils1 amd64 1.5.9-9.2ubuntu2 [8720 B]
Get:9 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libkrb5-3 amd64 1.16-2ubuntu0.1 [279 kB]
Get:10 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libgssapi-krb5-2 amd64 1.16-2ubuntu0.1 [122 kB]
Get:11 http://archive.ubuntu.com/ubuntu bionic/main amd64 libpsl5 amd64 0.19.1-5build1 [41.8 kB]
Get:12 http://archive.ubuntu.com/ubuntu bionic/main amd64 publicsuffix all 20180223.1310-1 [97.6 kB]
Get:13 http://archive.ubuntu.com/ubuntu bionic/main amd64 libroken18-heimdal amd64 7.5.0+dfsg-1 [41.3 kB]
Get:14 http://archive.ubuntu.com/ubuntu bionic/main amd64 libasn1-8-heimdal amd64 7.5.0+dfsg-1 [175 kB]
Get:15 http://archive.ubuntu.com/ubuntu bionic/main amd64 libheimbase1-heimdal amd64 7.5.0+dfsg-1 [29.3 kB]
Get:16 http://archive.ubuntu.com/ubuntu bionic/main amd64 libhcrypto4-heimdal amd64 7.5.0+dfsg-1 [85.9 kB]
Get:17 http://archive.ubuntu.com/ubuntu bionic/main amd64 libwind0-heimdal amd64 7.5.0+dfsg-1 [47.8 kB]
Get:18 http://archive.ubuntu.com/ubuntu bionic/main amd64 libhx509-5-heimdal amd64 7.5.0+dfsg-1 [107 kB]
Get:19 http://archive.ubuntu.com/ubuntu bionic/main amd64 libkrb5-26-heimdal amd64 7.5.0+dfsg-1 [206 kB]
Get:20 http://archive.ubuntu.com/ubuntu bionic/main amd64 libheimntlm0-heimdal amd64 7.5.0+dfsg-1 [14.8 kB]
Get:21 http://archive.ubuntu.com/ubuntu bionic/main amd64 libgssapi3-heimdal amd64 7.5.0+dfsg-1 [96.5 kB]
Get:22 http://archive.ubuntu.com/ubuntu bionic/main amd64 libsasl2-modules-db amd64 2.1.27~101-g0780600+dfsg-3ubuntu2 [14.8 kB]
Get:23 http://archive.ubuntu.com/ubuntu bionic/main amd64 libsasl2-2 amd64 2.1.27~101-g0780600+dfsg-3ubuntu2 [49.2 kB]
Get:24 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libldap-common all 2.4.45+dfsg-1ubuntu1.4 [16.9 kB]
Get:25 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libldap-2.4-2 amd64 2.4.45+dfsg-1ubuntu1.4 [155 kB]
Get:26 http://archive.ubuntu.com/ubuntu bionic/main amd64 libnghttp2-14 amd64 1.30.0-1ubuntu1 [77.8 kB]
Get:27 http://archive.ubuntu.com/ubuntu bionic/main amd64 librtmp1 amd64 2.4+20151223.gitfa8646d.1-1 [54.2 kB]
Get:28 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 libcurl4 amd64 7.58.0-2ubuntu3.8 [214 kB]
Get:29 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 curl amd64 7.58.0-2ubuntu3.8 [159 kB]
Get:30 http://archive.ubuntu.com/ubuntu bionic/main amd64 libsasl2-modules amd64 2.1.27~101-g0780600+dfsg-3ubuntu2 [48.7 kB]
Fetched 4834 kB in 28s (170 kB/s)
debconf: delaying package configuration, since apt-utils is not installed
Selecting previously unselected package libssl1.1:amd64.
(Reading database ... 4046 files and directories currently installed.)
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Unpacking libssl1.1:amd64 (1.1.1-1ubuntu2.1~18.04.4) ...
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Unpacking openssl (1.1.1-1ubuntu2.1~18.04.4) ...
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Setting up libsasl2-modules-db:amd64 (2.1.27~101-g0780600+dfsg-3ubuntu2) ...
Setting up libsasl2-2:amd64 (2.1.27~101-g0780600+dfsg-3ubuntu2) ...
Setting up libroken18-heimdal:amd64 (7.5.0+dfsg-1) ...
Setting up librtmp1:amd64 (2.4+20151223.gitfa8646d.1-1) ...
Setting up libkrb5support0:amd64 (1.16-2ubuntu0.1) ...
Setting up krb5-locales (1.16-2ubuntu0.1) ...
Setting up publicsuffix (20180223.1310-1) ...
Setting up libssl1.1:amd64 (1.1.1-1ubuntu2.1~18.04.4) ...
debconf: unable to initialize frontend: Dialog
debconf: (No usable dialog-like program is installed, so the dialog based frontend cannot be used. at /usr/share/perl5/Debconf/FrontEnd/Dialog.pm line 76.)
debconf: falling back to frontend: Readline
debconf: unable to initialize frontend: Readline
debconf: (Can't locate Term/ReadLine.pm in @INC (you may need to install the Term::ReadLine module) (@INC contains: /etc/perl /usr/local/lib/x86_64-linux-gnu/perl/5.26.1 /usr/local/share/perl/5.26.1 /usr/lib/x86_64-linux-gnu/perl5/5.26 /usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl/5.26 /usr/share/perl/5.26 /usr/local/lib/site_perl /usr/lib/x86_64-linux-gnu/perl-base) at /usr/share/perl5/Debconf/FrontEnd/Readline.pm line 7.)
debconf: falling back to frontend: Teletype
Setting up libheimbase1-heimdal:amd64 (7.5.0+dfsg-1) ...
Setting up openssl (1.1.1-1ubuntu2.1~18.04.4) ...
Setting up libsqlite3-0:amd64 (3.22.0-1ubuntu0.1) ...
Setting up libkeyutils1:amd64 (1.5.9-9.2ubuntu2) ...
Setting up libsasl2-modules:amd64 (2.1.27~101-g0780600+dfsg-3ubuntu2) ...
Setting up ca-certificates (20180409) ...
debconf: unable to initialize frontend: Dialog
debconf: (No usable dialog-like program is installed, so the dialog based frontend cannot be used. at /usr/share/perl5/Debconf/FrontEnd/Dialog.pm line 76.)
debconf: falling back to frontend: Readline
debconf: unable to initialize frontend: Readline
debconf: (Can't locate Term/ReadLine.pm in @INC (you may need to install the Term::ReadLine module) (@INC contains: /etc/perl /usr/local/lib/x86_64-linux-gnu/perl/5.26.1 /usr/local/share/perl/5.26.1 /usr/lib/x86_64-linux-gnu/perl5/5.26 /usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl/5.26 /usr/share/perl/5.26 /usr/local/lib/site_perl /usr/lib/x86_64-linux-gnu/perl-base) at /usr/share/perl5/Debconf/FrontEnd/Readline.pm line 7.)
debconf: falling back to frontend: Teletype
Updating certificates in /etc/ssl/certs...
133 added, 0 removed; done.
Setting up libk5crypto3:amd64 (1.16-2ubuntu0.1) ...
Setting up libwind0-heimdal:amd64 (7.5.0+dfsg-1) ...
Setting up libasn1-8-heimdal:amd64 (7.5.0+dfsg-1) ...
Setting up libhcrypto4-heimdal:amd64 (7.5.0+dfsg-1) ...
Setting up libhx509-5-heimdal:amd64 (7.5.0+dfsg-1) ...
Setting up libkrb5-3:amd64 (1.16-2ubuntu0.1) ...
Setting up libkrb5-26-heimdal:amd64 (7.5.0+dfsg-1) ...
Setting up libheimntlm0-heimdal:amd64 (7.5.0+dfsg-1) ...
Setting up libgssapi-krb5-2:amd64 (1.16-2ubuntu0.1) ...
Setting up libgssapi3-heimdal:amd64 (7.5.0+dfsg-1) ...
Setting up libldap-2.4-2:amd64 (2.4.45+dfsg-1ubuntu1.4) ...
Setting up libcurl4:amd64 (7.58.0-2ubuntu3.8) ...
Setting up curl (7.58.0-2ubuntu3.8) ...
Processing triggers for libc-bin (2.27-3ubuntu1) ...
Processing triggers for ca-certificates (20180409) ...
Updating certificates in /etc/ssl/certs...
0 added, 0 removed; done.
Running hooks in /etc/ca-certificates/update.d...
done.
root@310f22c574d3:/#

// Checking "curl":
root@310f22c574d3:/# curl google.com
<HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8">
<TITLE>301 Moved</TITLE></HEAD><BODY>
<H1>301 Moved</H1>
The document has moved
<A HREF="http://www.google.com/">here</A>.
</BODY></HTML>

// Exiting the container:
root@310f22c574d3:/# exit
exit

PS C:\Users\MOHI\code> docker container ls
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
2a59253871ff nginx "nginx -g 'daemon of…" 39 minutes ago Up 39 minutes 0.0.0.0:80->80/tcp nginx_web
8c8313534019 mysql "docker-entrypoint.s…" 40 minutes ago Up 40 minutes 0.0.0.0:3306->3306/tcp, 33060/tcp mysql_db

PS C:\Users\MOHI\code> docker container ls -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
310f22c574d3 ubuntu "/bin/bash" 9 minutes ago Exited (0) 32 seconds ago ubuntu_full
6b2de0d681de nginx "bash" 26 minutes ago Exited (0) 22 minutes ago nginx_proxy
2a59253871ff nginx "nginx -g 'daemon of…" 40 minutes ago Up 39 minutes 0.0.0.0:80->80/tcp nginx_web
8c8313534019 mysql "docker-entrypoint.s…" 40 minutes ago Up 40 minutes 0.0.0.0:3306->3306/tcp, 33060/tcp mysql_db
PS C:\Users\MOHI\code>

PS C:\Users\MOHI\code> docker container start --help

Usage: docker container start [OPTIONS] CONTAINER [CONTAINER...]

Start one or more stopped containers

Options:
-a, --attach Attach STDOUT/STDERR and forward signals
--detach-keys string Override the key sequence for detaching a
container
-i, --interactive Attach container's STDIN

// Starting the newly created "ubuntu_full" container:
PS C:\Users\MOHI\code> docker container start -ai ubuntu_full
root@310f22c574d3:/#

root@310f22c574d3:/# curl google.com
<HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8">
<TITLE>301 Moved</TITLE></HEAD><BODY>
<H1>301 Moved</H1>
The document has moved
<A HREF="http://www.google.com/">here</A>.
</BODY></HTML>

root@310f22c574d3:/# exit
exit
PS C:\Users\MOHI\code>

// Docker container exec, Run additional process in running container:
PS C:\Users\MOHI\code> docker container ls
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
2a59253871ff nginx "nginx -g 'daemon of…" 44 minutes ago Up 44 minutes 0.0.0.0:80->80/tcp nginx_web
8c8313534019 mysql "docker-entrypoint.s…" 45 minutes ago Up 44 minutes 0.0.0.0:3306->3306/tcp, 33060/tcp mysql_db

PS C:\Users\MOHI\code> docker container ls -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
310f22c574d3 ubuntu "/bin/bash" 14 minutes ago Exited (0) About a minute ago ubuntu_full
6b2de0d681de nginx "bash" 31 minutes ago Exited (0) 27 minutes ago nginx_proxy
2a59253871ff nginx "nginx -g 'daemon of…" 44 minutes ago Up 44 minutes 0.0.0.0:80->80/tcp nginx_web
8c8313534019 mysql "docker-entrypoint.s…" 45 minutes ago Up 45 minutes 0.0.0.0:3306->3306/tcp, 33060/tcp mysql_db

PS C:\Users\MOHI\code> docker container exec --help

Usage: docker container exec [OPTIONS] CONTAINER COMMAND [ARG...]

Run a command in a running container

Options:
-d, --detach Detached mode: run command in the background
--detach-keys string Override the key sequence for detaching a
container
-e, --env list Set environment variables
-i, --interactive Keep STDIN open even if not attached
--privileged Give extended privileges to the command
-t, --tty Allocate a pseudo-TTY
-u, --user string Username or UID (format:
<name|uid>[:<group|gid>])
-w, --workdir string Working directory inside the container

// Entering into mysql_db container:
PS C:\Users\MOHI\code> docker container exec -it mysql_db bash
root@8c8313534019:/#

root@8c8313534019:/# ls
bin boot dev docker-entrypoint-initdb.d entrypoint.sh etc home lib lib64 media mnt opt proc root run sbin srv sys tmp usr var
root@8c8313534019:/# whoami
root
root@8c8313534019:/# uname -a
Linux 8c8313534019 4.9.184-linuxkit #1 SMP Tue Jul 2 22:58:16 UTC 2019 x86_64 GNU/Linux

PS C:\Users\MOHI\code> docker container ls
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
2a59253871ff nginx "nginx -g 'daemon of…" 51 minutes ago Up 51 minutes 0.0.0.0:80->80/tcp nginx_web
8c8313534019 mysql "docker-entrypoint.s…" 51 minutes ago Up 51 minutes 0.0.0.0:3306->3306/tcp, 33060/tcp mysql_db

Note: mysql_db container is still running though we exit from the container, it will just stopped the process "bash" and will run the container continuously.

// Play with "Alpine Linux", A small security focused distribution:

// Pull the alpine image from Docker Hub:
PS C:\Users\MOHI\code> docker pull alpine
Using default tag: latest
latest: Pulling from library/alpine
89d9c30c1d48: Pull complete
Digest: sha256:c19173c5ada610a5989151111163d28a67368362762534d8a8121ce95cf2bd5a
Status: Downloaded newer image for alpine:latest
docker.io/library/alpine:latest

// List the locally available images:
PS C:\Users\MOHI\code> docker image ls
REPOSITORY TAG IMAGE ID CREATED SIZE
ubuntu latest 775349758637 6 days ago 64.2MB
httpd latest d3017f59d5e2 7 days ago 165MB
nginx latest 540a289bab6c 2 weeks ago 126MB
alpine latest 965ea09ff2eb 2 weeks ago 5.55MB
mysql latest c8ee894bd2bd 3 weeks ago 456MB
hello-world latest fce289e99eb9 10 months ago 1.84kB

PS C:\Users\MOHI\code> docker container run -it alpine bash
C:\Program Files\Docker\Docker\Resources\bin\docker.exe: Error response from daemon: OCI runtime create failed: container_linux.go:346: starting container process caused "exec: \"bash\": executable file not found in $PATH": unknown.

Note: Above error tells us that the container process started and it caused the executable file "bash" to not be found in the Path. Alpine is small image and that not containers "bash". But it has ".sh"

// Running the command with "sh" instead of "bash"
PS C:\Users\MOHI\code> docker container run -it alpine sh
/ #

Note: If want then we can install the "bash" into the "alpine" linux by using it's package manager "apk"

/ # apk
apk-tools 2.10.4, compiled for x86_64.

Installing and removing packages:
add Add PACKAGEs to 'world' and install (or upgrade) them, while ensuring that all dependencies are met
del Remove PACKAGEs from 'world' and uninstall them

System maintenance:
fix Repair package or upgrade it without modifying main dependencies
update Update repository indexes from all remote repositories
upgrade Upgrade currently installed packages to match repositories
cache Download missing PACKAGEs to cache and/or delete unneeded files from cache

Querying information about packages:
info Give detailed information about PACKAGEs or repositories
list List packages by PATTERN and other criteria
dot Generate graphviz graphs
policy Show repository policy for packages

Repository maintenance:
index Create repository index file from FILEs
fetch Download PACKAGEs from global repositories to a local directory
verify Verify package integrity and signature
manifest Show checksums of package contents

Use apk <command> --help for command-specific help.
Use apk --help --verbose for a full command listing.

This apk has coffee making abilities.