DOCKER

Docker : Virtualization splitting one server into many logical servers with in the limit of server capacity.

Difference between Virtual Machines and Docker Containers (Source: Docker)
This makes containers much smaller, faster, and more efficient. While a VM can take about a minute to spin up and can weigh several Gigabytes, a container weighs, on average, 400 to 600mb (the biggest ones).
They also take only seconds to spin up. This is mostly because they don't have to spin a whole operating system before running the process.

DOCKER Installation

Using username "root".

Last login: Wed May 18 16:12:16 2022 from 192.168.2.1

[root@chef-workstation ~]# curl -fsSL https://get.docker.com -o get-docker.sh

[root@chef-workstation ~]# sh get-docker.sh

# Executing docker install script, commit: 614d05e0e669a0577500d055677bb6f71e822356

+ sh -c 'yum install -y -q yum-utils'

Delta RPMs disabled because /usr/bin/applydeltarpm not installed.

Warning: RPMDB altered outside of yum.

+ sh -c 'yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo'

Loaded plugins: fastestmirror

adding repo from: https://download.docker.com/linux/centos/docker-ce.repo

grabbing file https://download.docker.com/linux/centos/docker-ce.repo to /etc/yum.repos.d/docker-ce.repo

repo saved to /etc/yum.repos.d/docker-ce.repo

+ '[' stable '!=' stable ']'

+ sh -c 'yum makecache'

Loaded plugins: fastestmirror

Loading mirror speeds from cached hostfile

* base: centos.excellmedia.net

* extras: centos.excellmedia.net

* updates: centos.excellmedia.net

base | 3.6 kB 00:00:00

docker-ce-stable | 3.5 kB 00:00:00

extras | 2.9 kB 00:00:00

jenkins | 2.9 kB 00:00:00

updates | 2.9 kB 00:00:00

(1/12): docker-ce-stable/7/x86_64/filelists_db | 32 kB 00:00:00

(2/12): docker-ce-stable/7/x86_64/updateinfo | 55 B 00:00:00

(3/12): docker-ce-stable/7/x86_64/primary_db | 78 kB 00:00:00

(4/12): docker-ce-stable/7/x86_64/other_db | 124 kB 00:00:00

(5/12): base/7/x86_64/other_db | 2.6 MB 00:00:01

(6/12): extras/7/x86_64/other_db | 148 kB 00:00:00

(7/12): extras/7/x86_64/filelists_db | 277 kB 00:00:00

(8/12): jenkins/filelists_db | 26 kB 00:00:01

(9/12): jenkins/other_db | 41 kB 00:00:01

(10/12): updates/7/x86_64/filelists_db | 8.4 MB 00:00:03

(11/12): base/7/x86_64/filelists_db | 7.2 MB 00:00:05

(12/12): updates/7/x86_64/other_db | 1.0 MB 00:00:52

Metadata Cache Created

+ sh -c 'yum install -y -q docker-ce docker-ce-cli containerd.io docker-scan-plugin docker-compose-plugin docker-ce-rootless-extras'

warning: /var/cache/yum/x86_64/7/docker-ce-stable/packages/docker-ce-20.10.16-3.el7.x86_64.rpm: Header V4 RSA/SHA512 Signature, key ID 621e9f35: NOKEY

Public key for docker-ce-20.10.16-3.el7.x86_64.rpm is not installed

Importing GPG key 0x621E9F35:

Userid : "Docker Release (CE rpm) <docker@docker.com>"

Fingerprint: 060a 61c5 1b55 8a7f 742b 77aa c52f eb6b 621e 9f35

From : https://download.docker.com/linux/centos/gpg

================================================================================

To run Docker as a non-privileged user, consider setting up the

Docker daemon in rootless mode for your user:

dockerd-rootless-setuptool.sh install

Visit https://docs.docker.com/go/rootless/ to learn about rootless mode.

To run the Docker daemon as a fully privileged service, but granting non-root

users access, refer to https://docs.docker.com/go/daemon-access/

WARNING: Access to the remote API on a privileged Docker daemon is equivalent

to root access on the host. Refer to the 'Docker daemon attack surface'

documentation for details: https://docs.docker.com/go/attack-surface/

================================================================================

[root@chef-workstation ~]# docker --version

Docker version 20.10.16, build aa7e414

systemctl enable docker -> this will enables in booting process to start docker services.

[root@chef-workstation ~]# systemctl enable docker

Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service.

[root@chef-workstation ~]#

Docker Commands

systemctl status docker --> status of the docker services.

systemctl start docker --> starting the docker services.

systemctl start docker --> stopping the docker services.

docker ps --> listing the container which are running currently.

docker ps -a --> listing all the containers including which are not running also.

docker images --> it will display all the images.

docker pull <<image_name>> --> it will download the image to local.

docker run -it <<image_name>> --> it will create the container.

ctrl+p+q --> It will come out from container without shut down the container.

[root@chef-workstation ~]# systemctl status docker

● docker.service - Docker Application Container Engine

Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)

Active: inactive (dead)

Docs: https://docs.docker.com

[root@chef-workstation ~]# systemctl start docker

[root@chef-workstation ~]# docker images

REPOSITORY TAG IMAGE ID CREATED SIZE

[root@chef-workstation ~]# docker ps

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

[root@chef-workstation ~]#

docker pull <<image_name>> --> it will download the image to local.

[root@chef-workstation ~]# docker pull ubuntu

Using default tag: latest

latest: Pulling from library/ubuntu

125a6e411906: Pull complete

Digest: sha256:26c68657ccce2cb0a31b330cb0be2b5e108d467f641c62e13ab40cbec258c68d

Status: Downloaded newer image for ubuntu:latest

docker.io/library/ubuntu:latest

[root@chef-workstation ~]#

root@a8a79b036835:/# apt-get update -y

Get:1 http://archive.ubuntu.com/ubuntu jammy InRelease [270 kB]

Get:2 http://security.ubuntu.com/ubuntu jammy-security InRelease [110 kB]

Get:3 http://archive.ubuntu.com/ubuntu jammy-updates InRelease [109 kB]

Get:4 http://archive.ubuntu.com/ubuntu jammy-backports InRelease [90.7 kB]

Get:5 http://archive.ubuntu.com/ubuntu jammy/universe amd64 Packages [17.5 MB]

Get:6 http://security.ubuntu.com/ubuntu jammy-security/universe amd64 Packages [64.3 kB]

Get:7 http://security.ubuntu.com/ubuntu jammy-security/restricted amd64 Packages [132 kB]

Get:8 http://archive.ubuntu.com/ubuntu jammy/main amd64 Packages [1792 kB]

Get:9 http://archive.ubuntu.com/ubuntu jammy/multiverse amd64 Packages [266 kB]

Get:10 http://archive.ubuntu.com/ubuntu jammy/restricted amd64 Packages [164 kB]

Get:11 http://archive.ubuntu.com/ubuntu jammy-updates/multiverse amd64 Packages [4653 B]

Get:12 http://archive.ubuntu.com/ubuntu jammy-updates/main amd64 Packages [192 kB]

Get:13 http://archive.ubuntu.com/ubuntu jammy-updates/restricted amd64 Packages [132 kB]

Get:14 http://archive.ubuntu.com/ubuntu jammy-updates/universe amd64 Packages [106 kB]

Get:15 http://security.ubuntu.com/ubuntu jammy-security/multiverse amd64 Packages [4653 B]

Get:16 http://security.ubuntu.com/ubuntu jammy-security/main amd64 Packages [97.8 kB]

Fetched 21.0 MB in 5s (3904 kB/s)

Reading package lists... Done

root@a8a79b036835:/#

apt-get install git -y --> GIT installation on ubuntu image

root@a8a79b036835:/# apt-get install git -y

Reading package lists... Done

Building dependency tree... Done

Reading state information... Done

The following additional packages will be installed:

ca-certificates git-man less libbrotli1 libbsd0 libcbor0.8 libcurl3-gnutls libedit2 liberror-perl libexpat1 libfido2-1

libgdbm-compat4 libgdbm6 libldap-2.5-0 libldap-common libmd0 libnghttp2-14 libperl5.34 libpsl5 librtmp1 libsasl2-2 libsasl2-modules

libsasl2-modules-db libssh-4 libssl3 libx11-6 libx11-data libxau6 libxcb1 libxdmcp6 libxext6 libxmuu1 netbase openssh-client

openssl patch perl perl-modules-5.34 publicsuffix xauth

Suggested packages:

gettext-base git-daemon-run | git-daemon-sysvinit git-doc git-email git-gui gitk gitweb git-cvs git-mediawiki git-svn gdbm-l10n

libsasl2-modules-gssapi-mit | libsasl2-modules-gssapi-heimdal libsasl2-modules-ldap libsasl2-modules-otp libsasl2-modules-sql

keychain libpam-ssh monkeysphere ssh-askpass ed diffutils-doc perl-doc libterm-readline-gnu-perl | libterm-readline-perl-perl make

libtap-harness-archive-perl

The following NEW packages will be installed:

ca-certificates git git-man less libbrotli1 libbsd0 libcbor0.8 libcurl3-gnutls libedit2 liberror-perl libexpat1 libfido2-1

libgdbm-compat4 libgdbm6 libldap-2.5-0 libldap-common libmd0 libnghttp2-14 libperl5.34 libpsl5 librtmp1 libsasl2-2 libsasl2-modules

libsasl2-modules-db libssh-4 libx11-6 libx11-data libxau6 libxcb1 libxdmcp6 libxext6 libxmuu1 netbase openssh-client openssl patch

perl perl-modules-5.34 publicsuffix xauth

The following packages will be upgraded:

libssl3

1 upgraded, 40 newly installed, 0 to remove and 3 not upgraded.

Need to get 19.3 MB of archives.

After this operation, 84.2 MB of additional disk space will be used.

Get:1 http://archive.ubuntu.com/ubuntu jammy/main amd64 perl-modules-5.34 all 5.34.0-3ubuntu1 [2975 kB]

Get:2 http://archive.ubuntu.com/ubuntu jammy/main amd64 libgdbm6 amd64 1.23-1 [33.9 kB]

Get:3 http://archive.ubuntu.com/ubuntu jammy/main amd64 libgdbm-compat4 amd64 1.23-1 [6606 B]

Get:4 http://archive.ubuntu.com/ubuntu jammy/main amd64 libperl5.34 amd64 5.34.0-3ubuntu1 [4809 kB]

Get:5 http://archive.ubuntu.com/ubuntu jammy/main amd64 perl amd64 5.34.0-3ubuntu1 [232 kB]

Get:6 http://archive.ubuntu.com/ubuntu jammy-updates/main amd64 libssl3 amd64 3.0.2-0ubuntu1.2 [1900 kB]

Get:7 http://archive.ubuntu.com/ubuntu jammy-updates/main amd64 openssl amd64 3.0.2-0ubuntu1.2 [1183 kB]

Get:8 http://archive.ubuntu.com/ubuntu jammy/main amd64 ca-certificates all 20211016 [148 kB]

Get:9 http://archive.ubuntu.com/ubuntu jammy/main amd64 less amd64 590-1build1 [143 kB]

Get:10 http://archive.ubuntu.com/ubuntu jammy/main amd64 libmd0 amd64 1.0.4-1build1 [23.0 kB]

Get:11 http://archive.ubuntu.com/ubuntu jammy/main amd64 libbsd0 amd64 0.11.5-1 [44.8 kB]

Get:12 http://archive.ubuntu.com/ubuntu jammy/main amd64 libexpat1 amd64 2.4.7-1 [90.7 kB]

Get:13 http://archive.ubuntu.com/ubuntu jammy/main amd64 netbase all 6.3 [12.9 kB]

Get:14 http://archive.ubuntu.com/ubuntu jammy/main amd64 libcbor0.8 amd64 0.8.0-2ubuntu1 [24.6 kB]

Selecting previously unselected package libx11-data.

Preparing to unpack .../15-libx11-data_2%3a1.7.5-1_all.deb ...

Unpacking libx11-data (2:1.7.5-1) ...

Selecting previously unselected package libx11-6:amd64.

Preparing to unpack .../16-libx11-6_2%3a1.7.5-1_amd64.deb ...

Unpacking libx11-6:amd64 (2:1.7.5-1) ...

Selecting previously unselected package libxext6:amd64.

Preparing to unpack .../17-libxext6_2%3a1.3.4-1build1_amd64.deb ...

Unpacking libxext6:amd64 (2:1.3.4-1build1) ...

Selecting previously unselected package libxmuu1:amd64.

Preparing to unpack .../18-libxmuu1_2%3a1.1.3-3_amd64.deb ...

Unpacking libxmuu1:amd64 (2:1.1.3-3) ...

Selecting previously unselected package openssh-client.

Preparing to unpack .../19-openssh-client_1%3a8.9p1-3_amd64.deb ...

Unpacking openssh-client (1:8.9p1-3) ...

Selecting previously unselected package publicsuffix.

Preparing to unpack .../20-publicsuffix_20211207.1025-1_all.deb ...

Unpacking publicsuffix (20211207.1025-1) ...

Selecting previously unselected package xauth.

Preparing to unpack .../21-xauth_1%3a1.1-1build2_amd64.deb ...

Unpacking xauth (1:1.1-1build2) ...

Selecting previously unselected package libbrotli1:amd64.

Preparing to unpack .../22-libbrotli1_1.0.9-2build6_amd64.deb ...

Unpacking libbrotli1:amd64 (1.0.9-2build6) ...

Selecting previously unselected package libsasl2-modules-db:amd64.

Preparing to unpack .../23-libsasl2-modules-db_2.1.27+dfsg2-3ubuntu1_amd64.deb ...

Unpacking libsasl2-modules-db:amd64 (2.1.27+dfsg2-3ubuntu1) ...

Selecting previously unselected package libsasl2-2:amd64.

Preparing to unpack .../24-libsasl2-2_2.1.27+dfsg2-3ubuntu1_amd64.deb ...

Unpacking libsasl2-2:amd64 (2.1.27+dfsg2-3ubuntu1) ...

Selecting previously unselected package libldap-2.5-0:amd64.

Preparing to unpack .../25-libldap-2.5-0_2.5.11+dfsg-1~exp1ubuntu3.1_amd64.deb ...

Unpacking libldap-2.5-0:amd64 (2.5.11+dfsg-1~exp1ubuntu3.1) ...

Selecting previously unselected package librtmp1:amd64.

Preparing to unpack .../26-librtmp1_2.4+20151223.gitfa8646d.1-2build4_amd64.deb ...

Unpacking librtmp1:amd64 (2.4+20151223.gitfa8646d.1-2build4) ..

Preparing to unpack .../34-patch_2.7.6-7build2_amd64.deb ...

Unpacking patch (2.7.6-7build2) ...

Setting up libexpat1:amd64 (2.4.7-1) ...

Setting up libxau6:amd64 (1:1.0.9-1build5) ...

Setting up libpsl5:amd64 (0.21.0-1.2build2) ...

Setting up libcbor0.8:amd64 (0.8.0-2ubuntu1) ...

Setting up libbrotli1:amd64 (1.0.9-2build6) ...

Setting up libsasl2-modules:amd64 (2.1.27+dfsg2-3ubuntu1) ...

Setting up libnghttp2-14:amd64 (1.43.0-1build3) ...

Setting up less (590-1build1) ...

Setting up perl-modules-5.34 (5.34.0-3ubuntu1) ...

Setting up libldap-common (2.5.11+dfsg-1~exp1ubuntu3.1) ...

Setting up libsasl2-modules-db:amd64 (2.1.27+dfsg2-3ubuntu1) ...

Setting up libx11-data (2:1.7.5-1) ...

Setting up librtmp1:amd64 (2.4+20151223.gitfa8646d.1-2build4) ...

Setting up patch (2.7.6-7build2) ...

Setting up libsasl2-2:amd64 (2.1.27+dfsg2-3ubuntu1) ...

Setting up libssh-4:amd64 (0.9.6-2build1) ...

Setting up libmd0:amd64 (1.0.4-1build1) ...

Setting up git-man (1:2.34.1-1ubuntu1.2) ...

Setting up netbase (6.3) ...

Setting up libfido2-1:amd64 (1.10.0-1) ...

Setting up openssl (3.0.2-0ubuntu1.2) ...

Setting up libbsd0:amd64 (0.11.5-1) ...

Setting up publicsuffix (20211207.1025-1) ...

Setting up libgdbm6:amd64 (1.23-1) ...

Setting up libxdmcp6:amd64 (1:1.1.3-0ubuntu5) ...

Setting up libxcb1:amd64 (1.14-3ubuntu3) ...

Setting up libedit2:amd64 (3.1-20210910-1build1) ...

Setting up libldap-2.5-0:amd64 (2.5.11+dfsg-1~exp1ubuntu3.1) ...

Setting up ca-certificates (20211016) ...

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 78.)

debconf: falling back to frontend: Readline

Setting up libperl5.34:amd64 (5.34.0-3ubuntu1) ...

Setting up openssh-client (1:8.9p1-3) ...

update-alternatives: using /usr/bin/ssh to provide /usr/bin/rsh (rsh) in auto mode

update-alternatives: warning: skip creation of /usr/share/man/man1/rsh.1.gz because associated file /usr/share/man/man1/ssh.1.gz (of link group rsh) doesn't exist

update-alternatives: using /usr/bin/slogin to provide /usr/bin/rlogin (rlogin) in auto mode

update-alternatives: warning: skip creation of /usr/share/man/man1/rlogin.1.gz because associated file /usr/share/man/man1/slogin.1.gz (of link group rlogin) doesn't exist

update-alternatives: using /usr/bin/scp to provide /usr/bin/rcp (rcp) in auto mode

update-alternatives: warning: skip creation of /usr/share/man/man1/rcp.1.gz because associated file /usr/share/man/man1/scp.1.gz (of link group rcp) doesn't exist

Setting up libxext6:amd64 (2:1.3.4-1build1) ...

Setting up libcurl3-gnutls:amd64 (7.81.0-1ubuntu1.2) ...

Setting up perl (5.34.0-3ubuntu1) ...

Setting up xauth (1:1.1-1build2) ...

Setting up liberror-perl (0.17029-1) ...

Setting up git (1:2.34.1-1ubuntu1.2) ...

Processing triggers for libc-bin (2.35-0ubuntu3) ...

Processing triggers for ca-certificates (20211016) ...

Updating certificates in /etc/ssl/certs...

0 added, 0 removed; done.

Running hooks in /etc/ca-certificates/update.d...

done.

root@a8a79b036835:/# git

usage: git [--version] [--help] [-C <path>] [-c <name>=<value>]

[--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]

[-p | --paginate | -P | --no-pager] [--no-replace-objects] [--bare]

[--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]

[--super-prefix=<path>] [--config-env=<name>=<envvar>]

<command> [<args>]

These are common Git commands used in various situations:

start a working area (see also: git help tutorial)

clone Clone a repository into a new directory

init Create an empty Git repository or reinitialize an existing one

work on the current change (see also: git help everyday)

add Add file contents to the index

mv Move or rename a file, a directory, or a symlink

restore Restore working tree files

rm Remove files from the working tree and from the index

examine the history and state (see also: git help revisions)

bisect Use binary search to find the commit that introduced a bug

diff Show changes between commits, commit and working tree, etc

grep Print lines matching a pattern

log Show commit logs

show Show various types of objects

status Show the working tree status

grow, mark and tweak your common history

branch List, create, or delete branches

commit Record changes to the repository

merge Join two or more development histories together

rebase Reapply commits on top of another base tip

reset Reset current HEAD to the specified state

switch Switch branches

tag Create, list, delete or verify a tag object signed with GPG

collaborate (see also: git help workflows)

fetch Download objects and refs from another repository

pull Fetch from and integrate with another repository or a local branch

push Update remote refs along with associated objects

'git help -a' and 'git help -g' list available subcommands and some

concept guides. See 'git help <command>' or 'git help <concept>'

to read about a specific subcommand or concept.

See 'git help git' for an overview of the system.

root@a8a79b036835:/# git --version

git version 2.34.1

apt-get remove git -y --> GIT uninstallation on ubuntu image

root@a8a79b036835:/# apt-get remove git -y

Reading package lists... Done

Building dependency tree... Done

Reading state information... Done

The following packages were automatically installed and are no longer required:

git-man less libbrotli1 libbsd0 libcbor0.8 libcurl3-gnutls libedit2 liberror-perl libexpat1 libfido2-1 libgdbm-compat4 libgdbm6

libldap-2.5-0 libldap-common libmd0 libnghttp2-14 libperl5.34 libpsl5 librtmp1 libsasl2-2 libsasl2-modules libsasl2-modules-db

libssh-4 libx11-6 libx11-data libxau6 libxcb1 libxdmcp6 libxext6 libxmuu1 netbase openssh-client patch perl perl-modules-5.34

publicsuffix xauth

Use 'apt autoremove' to remove them.

The following packages will be REMOVED:

git

0 upgraded, 0 newly installed, 1 to remove and 3 not upgraded.

After this operation, 18.8 MB disk space will be freed.

(Reading database ... 8352 files and directories currently installed.)

Removing git (1:2.34.1-1ubuntu1.2) ...

root@a8a79b036835:/#

exit --> It will shutdown the container and then it will come out.

root@a8a79b036835:/# exit

exit

[root@chef-workstation ~]#

docker ps --> listing the container which are running currently.

[root@chef-workstation ~]# docker ps

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

docker ps -a --> listing all the containers including which are not running also.

[root@chef-workstation ~]# docker ps -a

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

a8a79b036835 ubuntu "bash" 9 minutes ago Exited (0) 12 seconds ago dreamy_dubinsky

[root@chef-workstation ~]#

docker images --> listing all the images

[root@chef-workstation ~]# docker images

REPOSITORY TAG IMAGE ID CREATED SIZE

ubuntu latest d2e4e1f51132 2 weeks ago 77.8MB

[root@chef-workstation ~]#

docker run -it centos --> It will create the container, it will connected to container

[root@chef-workstation ~]# docker run -it centos

Unable to find image 'centos:latest' locally

latest: Pulling from library/centos

a1d0c7532777: Pull complete

Digest: sha256:a27fd8080b517143cbbbab9dfb7c8571c40d67d534bbdee55bd6c473f432b177

Status: Downloaded newer image for centos:latest

[root@d9bdd1c8170b /]#

[root@devops ~]# docker run -itd centos

8e16c8168527d70375751be6502bdb3827158155919fcceb34e462183cc00a06

[ o

[root@devops ~]# docker ps

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

8e16c8168527 centos "/bin/bash" 13 seconds ago Up 12 seconds gallant_saha

eba16896873b ubuntu "bash" 6 minutes ago Up 6 minutes friendly_solomon

[root@devops ~]#

[root@chef-workstation ~]# docker attach c4513c655044

[root@c4513c655044 /]#

[root@c4513c655044 /]# exit

exit

[root@chef-workstation ~]# docker ps -a

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

c4513c655044 centos "/bin/bash" 50 seconds ago Exited (0) 1 second ago agitated_banach

a8a79b036835 ubuntu "bash" 14 minutes ago Up 2 minutes dreamy_dubinsky

[root@chef-workstation ~]# docker start c4513c655044

c4513c655044

[root@chef-workstation ~]# docker exec -it c4513c655044 /bin/bash

[root@c4513c655044 /]#

[root@c4513c655044 /]# exit

exit

[root@chef-workstation ~]# docker ps -a

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

c4513c655044 centos "/bin/bash" 2 minutes ago Up 10 seconds agitated_banach

a8a79b036835 ubuntu "bash" 16 minutes ago Up 4 minutes dreamy_dubinsky

[root@chef-workstation ~]#

docker pull centos:centos7.9.2009 --> It will create the container, it will connected to container

[root@sainath ~]# docker run -it centos:centos7.9.2009

yum install git -y -- It will install Git.

[root@3777aaa1b92a /]# yum install git -y

Loaded plugins: fastestmirror, ovl

Determining fastest mirrors

* base: mirror.myfahim.com

* extras: mirror.myfahim.com

* updates: mirror.myfahim.com

base | 3.6 kB 00:00:00

extras

.....

perl-threads-shared.x86_64 0:1.43-6.el7 rsync.x86_64 0:3.1.2-10.el7

Complete!

[root@3777aaa1b92a /]#

docker tag <<CON_ID>> << TAG_NAME >>

Deleting Containers

[root@sainath ~]# docker ps -a

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

768324272d05 b7fcc2501577 "/bin/bash" 17 hours ago Exited (127) 17 hours ago amazing_jepsen

af36ec6710f5 b7fcc2501577 "/bin/sh -c 'cd /opt…" 18 hours ago Exited (5) 18 hours ago vigorous_hellman

4bf63a713288 b7fcc2501577 "/bin/sh -c 'cd tomc…" 18 hours ago Exited (1) 18 hours ago cranky_dijkstra

261d8729b104 b7fcc2501577 "/bin/sh -c 'cd tomc…" 18 hours ago Exited (1) 18 hours ago keen_knuth

ba95907183a4 b7fcc2501577 "/bin/sh -c 'cd /roo…" 18 hours ago Exited (1) 18 hours ago quirky_mayer

7ee0affc986e 65adfdc6365e "/bin/sh -c 'mkdir /…" 18 hours ago Exited (1) 18 hours ago unruffled_borg

cef6e869e41c 65adfdc6365e "/bin/sh -c 'mkdir /…" 18 hours ago Exited (1) 18 hours ago musing_solomon

9ec14a058028 testcentos "/bin/bash" 18 hours ago Exited (0) 18 hours ago stoic_tharp

61e9004eaf40 bc4f74651d68 "/bin/sh -c 'touch /…" 19 hours ago Exited (1) 19 hours ago boring_swartz

84e40f80922f bc4f74651d68 "/bin/sh -c 'touch /…" 19 hours ago Exited (1) 19 hours ago zealous_pasteur

4810194ee1ef bc4f74651d68 "/bin/sh -c 'touch /…" 19 hours ago Exited (1) 19 hours ago lucid_jang

3777aaa1b92a centos:centos7.9.2009 "/bin/bash" 20 hours ago Exited (127) 20 hours ago friendly_golick

02377989afb2 centos "/bin/bash" 20 hours ago Exited (127) 20 hours ago angry_clarke

1d11edfc2dd0 centos "/bin/bash" 20 hours ago Exited (127) 20 hours ago condescending_solomon

docker rm <<cont_ID>> - It will delete the container, when it is not running

[root@sainath ~]# docker rm 768324272d05

768324272d05

docker rm -f <<cont_ID>> - It will delete the container, when it is running also

[root@sainath ~]# docker rm -f af36ec6710f5

af36ec6710f5

docker ps -aq --> list of container ID's

[root@sainath ~]# docker ps -aq

4bf63a713288

261d8729b104

ba95907183a4

7ee0affc986e

cef6e869e41c

9ec14a058028

61e9004eaf40

84e40f80922f

4810194ee1ef

3777aaa1b92a

02377989afb2

1d11edfc2dd0

docker rm -f $(docker ps -qa) - It will delete the all containers.

[root@sainath ~]# docker rm -f $(docker ps -qa)

4bf63a713288

261d8729b104

ba95907183a4

7ee0affc986e

cef6e869e41c

9ec14a058028

61e9004eaf40

84e40f80922f

4810194ee1ef

3777aaa1b92a

02377989afb2

1d11edfc2dd0

[root@sainath ~]# docker ps

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

[root@sainath ~]#

Deleting Images

docker rmi <<Image_ID>> --> It will delete the Image.

[root@sainath ~]# docker images

REPOSITORY TAG IMAGE ID CREATED SIZE

testcentos latest eff4b651f9da 19 hours ago 428MB

cent_git latest 385ca84f6986 20 hours ago 428MB

ubuntu latest 27941809078c 9 days ago 77.8MB

centos centos7.9.2009 eeb6ee3f44bd 9 months ago 204MB

centos latest 5d0da3dc9764 9 months ago 231MB

[root@sainath ~]# docker rmi testcentos

Untagged: testcentos:latest

Deleted: sha256:eff4b651f9da1d1d76c561b4d3ad7b7c4a654a2d16b6f2d35457c7df5ac19e90

Deleted: sha256:774270ac4f35fda85652740235d7ad257b4b6d5588128406bb595abdf1516623

Deleted: sha256:6861e1391f8c58162b0b76f6148533774aa0b4fa91db8d91ca259331479e9336

[root@sainath ~]# docker images

REPOSITORY TAG IMAGE ID CREATED SIZE

cent_git latest 385ca84f6986 20 hours ago 428MB

ubuntu latest 27941809078c 9 days ago 77.8MB

centos centos7.9.2009 eeb6ee3f44bd 9 months ago 204MB

centos latest 5d0da3dc9764 9 months ago 231MB

[root@sainath ~]#

Docker Files

Configure docker hub account : https://docs.docker.com/

Using docker file -> create file , git installation, git configuration

[root@sainath sai]# cat dockerfile

FROM centos:centos7.9.2009

MAINTAINER "SAINATH KOTA"

RUN touch file1

RUN yum install git -y

RUN git config --global user.name "Sainath Kota"

RUN git config --global user.email "sainath.kota@gmail.com"

[root@sainath sai]#

[root@sainath sai]# docker build -t "testcentos" .

Sending build context to Docker daemon 2.048kB

Step 1/6 : FROM centos:centos7.9.2009

---> eeb6ee3f44bd

Step 2/6 : MAINTAINER "SAINATH KOTA"

---> Running in 6d0bbc5dcb40

Removing intermediate container 6d0bbc5dcb40

---> bc4f74651d68

Step 3/6 : RUN touch file1

---> Running in ea6b9919bb79

Removing intermediate container ea6b9919bb79

---> 65adfdc6365e

Step 4/6 : RUN yum install git -y

---> Running in 82ecb23bceec

Loaded plugins: fastestmirror, ovl

Determining fastest mirrors

* base: mirror.xeonbd.com

* extras: mirrors.bkns.vn

* updates: mirrors.bkns.vn

Resolving Dependencies

--> Running transaction check

Complete!

Removing intermediate container 82ecb23bceec

---> ff882dd16fef

Step 5/6 : RUN git config --global user.name "Sainath Kota"

---> Running in 5cae15395061

Removing intermediate container 5cae15395061

---> 6861e1391f8c

Step 6/6 : RUN git config --global user.email "sainath.kota@gmail.com"

---> Running in 54395253c177

Removing intermediate container 54395253c177

---> eff4b651f9da

Successfully built eff4b651f9da

Successfully tagged testcentos:latest

[root@sainath sai]# docker images

REPOSITORY TAG IMAGE ID CREATED SIZE

testcentos latest eff4b651f9da 56 seconds ago 428MB

cent_git latest 385ca84f6986 40 minutes ago 428MB

ubuntu latest 27941809078c 8 days ago 77.8MB

centos centos7.9.2009 eeb6ee3f44bd 9 months ago 204MB

centos latest 5d0da3dc9764 9 months ago 231MB

[root@sainath sai]#

[root@sainath ~]# docker run -it testcentos

[root@9ec14a058028 /]# git config --list

user.name=Sainath Kota

user.email=sainath.kota@gmail.com

[root@9ec14a058028 /]#

Example 2:

[root@sainath opt]# cat dockerfile

FROM centos:centos7.9.2009

MAINTAINER "SAINATH KOTA"

RUN touch file1 --> it creates the file

RUN mkdir tomcat1 --> it creates the Directory

RUN yum install wget -y --> it Installs the Wget

RUN cd /opt && wget https://dlcdn.apache.org/tomcat/tomcat-10/v10.0.22/bin/apache-tomcat-10.0.22.tar.gz --no-check-certificate --> it downloads the tomcat software.

RUN cd /opt && tar -xvf apache-tomcat-10.0.22.tar.gz --> it unzipps the tomcat software.