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Install Docker Engine in Centos#1 Vm.
[root@pks]# history
1 clear
2 sudo yum install -y yum-utils device-mapper-persistent-data lvm2
3 sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
4 sudo yum install –y https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
5 sudo yum-config-manager --enable rhui-REGION-rhel-server-extras
6 sudo yum install -y docker-ceVerification :
[root@pks ~]# cd
[root@pks ~]# which dockerd
/bin/dockerd
[root@pks ~]# which docker
/bin/docker
[root@pks ~]# ps -eaf | grep dockerd
root 951 1 0 03:32 ? 00:00:01 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
root 1783 1759 0 05:00 pts/1 00:00:00 grep --color=auto dockerd
[root@pks ~]# which containerd
/bin/containerd
[root@pks ~]# ps -eaf | grep containerd
root 862 1 0 03:32 ? 00:00:06 /usr/bin/containerd
root 951 1 0 03:32 ? 00:00:01 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
root 1787 1759 0 05:00 pts/1 00:00:00 grep --color=auto containerd[root@pks ~]# which docker
/bin/docker[root@pks ~]# cd
[root@pks ~]# which dockerd
/bin/dockerd
[root@pks ~]# which docker
/bin/docker
[root@pks ~]# ps -eaf | grep dockerd
root 951 1 0 03:32 ? 00:00:01 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
root 1783 1759 0 05:00 pts/1 00:00:00 grep --color=auto dockerd
[root@pks ~]# which containerd
/bin/containerd
[root@pks ~]# ps -eaf | grep containerd
root 862 1 0 03:32 ? 00:00:06 /usr/bin/containerd
root 951 1 0 03:32 ? 00:00:01 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
root 1787 1759 0 05:00 pts/1 00:00:00 grep --color=auto containerdAssignment#1
Create a Ubuntu container
[root@pks ~]# docker pull ubuntu
Using default tag: latest
latest: Pulling from library/ubuntu
Digest: sha256:b3e2e47d016c08b3396b5ebe06ab0b711c34e7f37b98c9d37abe794b71cea0a2
Status: Image is up to date for ubuntu:latest
docker.io/library/ubuntu:latest
[root@pks ~]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
8e6af5cf67b3 ubuntu "bash" 27 seconds ago Exited (0) 26 seconds ago silly_boyd
[root@pks ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
ubuntu latest c29284518f49 7 days ago 72.8MB
Install Update, git & apache2
[root@pks ~]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
[root@pks ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
ubuntu latest c29284518f49 7 days ago 72.8MB
[root@pks]# docker run -itd ubuntu
da2946cadce9993be089119595c07b2bf9023cc6fe8484e382ba40b699d2ff0a
[root@pks]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
da2946cadce9 ubuntu "bash" 6 seconds ago Up 5 seconds focused_sinoussi
root@da2946cadce9:/# apt install git
root@da2946cadce9:/# git version
git version 2.25.1
root@da2946cadce9:/# apt install apache2
root@da2946cadce9:/# apache2 -version
Server version: Apache/2.4.41 (Ubuntu)
Server built: 2021-07-05T07:16:56
Press Ctl+p+q ( to exit if you are in bash )Assignment#2
Create a httpd container exposed at 8080 port
[root@pks]# docker pull httpd
Using default tag: latest
latest: Pulling from library/httpd
Digest: sha256:1fd07d599a519b594b756d2e4e43a72edf7e30542ce646f5eb3328cf3b12341a
Status: Image is up to date for httpd:latest
docker.io/library/httpd:latest
[root@pks]# docker images|grep httpd
httpd latest bd29370f84ea 12 days ago 138MB
[root@pks]# docker run -d -p 8080:80 --name webserver httpd
e18a1c96c9b1ab7a688f2cd2beb0eaba6874a17c4955a4e41ffe98e68bbf76e9
[root@pks]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
e18a1c96c9b1 httpd "httpd-foreground" 26 seconds ago Up 25 seconds 0.0.0.0:8080->80/tcp, :::8080->80/tcp webserver
[root@pks]# docker attach da2946cadce9
root@da2946cadce9:/# apt update
Get:1 http://security.ubuntu.com/ubuntu focal-security InRelease [114 kB]
Get:2 http://archive.ubuntu.com/ubuntu focal InRelease [265 kB]
Get:3 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages [985 kB]
Get:4 http://archive.ubuntu.com/ubuntu focal-updates InRelease [114 kB]
Get:5 http://archive.ubuntu.com/ubuntu focal-backports InRelease [101 kB]
Get:6 http://security.ubuntu.com/ubuntu focal-security/restricted amd64 Packages [428 kB]
Get:7 http://archive.ubuntu.com/ubuntu focal/multiverse amd64 Packages [177 kB]
Get:8 http://archive.ubuntu.com/ubuntu focal/restricted amd64 Packages [33.4 kB]
Get:9 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages [1275 kB]
Get:10 http://security.ubuntu.com/ubuntu focal-security/multiverse amd64 Packages [32.7 kB]
Get:11 http://security.ubuntu.com/ubuntu focal-security/universe amd64 Packages [784 kB]
Get:12 http://archive.ubuntu.com/ubuntu focal/universe amd64 Packages [11.3 MB]
Get:13 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages [1417 kB]
Get:14 http://archive.ubuntu.com/ubuntu focal-updates/universe amd64 Packages [1055 kB]
Get:15 http://archive.ubuntu.com/ubuntu focal-updates/multiverse amd64 Packages [37.3 kB]
Get:16 http://archive.ubuntu.com/ubuntu focal-updates/restricted amd64 Packages [474 kB]
Get:17 http://archive.ubuntu.com/ubuntu focal-backports/main amd64 Packages [2668 B]
Get:18 http://archive.ubuntu.com/ubuntu focal-backports/universe amd64 Packages [6303 B]
Fetched 18.6 MB in 7s (2487 kB/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
run a git command in container from outside
[root@pks]# docker exec fb96ba213cac git version
git version 2.25.1Access(curl) container from node
[root@pks]# wget localhost:8080
--2021-07-21 06:00:02-- http://localhost:8080/
Resolving localhost (localhost)... ::1, 127.0.0.1
Connecting to localhost (localhost)|::1|:8080... connected.
HTTP request sent, awaiting response... 200 OK
Length: 45 [text/html]
Saving to: ‘index.html.1’
100%[=========================================================================================================================================================>] 45 --.-K/s in 0s
2021-07-21 06:00:02 (3.70 MB/s) - ‘index.html.1’ saved [45/45]Assignment#3
– Where is the LOCAL Registry and How do i find out???
By using docker info we can fine .
[root@pks]# docker info
Docker Root Dir: /var/lib/docker
[root@pks]# ll
total 8
drwx--x--x. 4 root root 120 Jul 20 06:06 buildkit
drwx-----x. 4 root root 150 Jul 21 06:28 containers
drwx------. 3 root root 22 Jul 20 06:06 image
-rw-r--r--. 1 root root 1388 Jul 21 06:51 info
drwxr-x---. 3 root root 19 Jul 20 06:06 network
drwx-----x. 16 root root 4096 Jul 21 06:28 overlay2
drwx------. 4 root root 32 Jul 20 06:06 plugins
drwx------. 2 root root 6 Jul 21 03:32 runtimes
drwx------. 2 root root 6 Jul 20 06:06 swarm
drwx------. 2 root root 6 Jul 21 03:32 tmp
drwx------. 2 root root 6 Jul 20 06:06 trust
drwx-----x. 2 root root 50 Jul 21 03:32 volumes
[root@pks]# cd overlay2
[root@pks]# ll
total 4
drwx-----x. 5 root root 69 Jul 21 06:28 2084f702d84cea4437d29d75d7bdb298c6423960f92937e645e7b357dbd60611
drwx-----x. 4 root root 72 Jul 21 06:28 2084f702d84cea4437d29d75d7bdb298c6423960f92937e645e7b357dbd60611-init
drwx-----x. 4 root root 72 Jul 20 06:08 3582fc98eadb391e96c56471e63e75a373347b041cc0830d64d0191aa86d2dad
drwx-----x. 4 root root 72 Jul 20 06:08 4042334baa7104f5f3c37c24933f4b48ebafd9b43fdcfbff8427cf7f6f100427
drwx-----x. 4 root root 72 Jul 20 06:08 44e3377d7f847deb718d8bc7cf6973c73ca66b32fbf3678e7a78a58b920d3aec
drwx-----x. 4 root root 55 Jul 21 06:28 5bcfff4c60322476d07f60b7f14e58bba39f4fa9beabf56a263540e263c6d743
drwx-----x. 4 root root 72 Jul 21 06:28 5bcfff4c60322476d07f60b7f14e58bba39f4fa9beabf56a263540e263c6d743-init
drwx-----x. 3 root root 47 Jul 21 05:14 72a82d12de04aea06a4c2d6735541eb453f445cfe2234d94a864f108094248f7
drwx-----x. 3 root root 47 Jul 20 07:04 88ffbaf180e0ae193119811a9990dd96ce95f666a4c23955fd94d3b5f5651053
drwx-----x. 4 root root 72 Jul 20 06:08 8a838646394c6c762c14ae565e4b9f00f8d3c5d45f4084aafad52e59c735f91d
drwx-----x. 4 root root 55 Jul 20 07:24 8f4f85670ff3710089f99a38b811d09acc26fa62f4de44f166e42d61d03f82a8
brw-------. 1 root root 8, 2 Jul 21 03:32 backingFsBlockDev
drwx-----x. 3 root root 47 Jul 20 06:08 e6059da5aaeb1b5715ed5709379b39f941b8f0fafc6f24b18709685d534e5f8e
drwx-----x. 4 root root 55 Jul 20 07:13 f4d3f3f0f672576f349e15cd511ee932f678fa6fa0f17fd7a40382afec38fa3f
drwx-----x. 2 root root 4096 Jul 21 06:28 l
– What is diff between docker pause and docker unpuase?
commands to pause and resume containers– What is significant of docker stop and docker kill?
if you wish to soft stop we will use stop .
Kill for will force shut downCreate an image with base – centos and git must be installed in it.
[root@pks]# docker run -itd centos
06e615d2e0d14caed3628301dc4db4bf23dd726584df0a88f250003486a7a786
[root@pks]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
06e615d2e0d1 centos "/bin/bash" 28 seconds ago Up 27 seconds magical_shockley
[root@pks]# docker attach 06e615d2e0d1
[root@06e615d2e0d1 /]# git --version
git version 2.27.0
[root@pks-wells ~]# docker commit -m "installed httpd and git" -a "HemanthVusirika" 06e615d2e0d1 centos-git-21-0
[root@pks]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
centos-git-21-07 latest d8795fb9189b 8 seconds ago 335MB