Swetha – Docker Lab Assignment

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Install Docker Engine in Centos#1 Vm.

[centos@ip-172-31-7-48 ~]$ sudo systemctl start docker
[centos@ip-172-31-7-48 ~]$ history
    1  sudo -s
    2  exit
    3  clear
    4  ls
    5  sudo yum install -y yum-utils device-mapper-persistent-data lvm2
    6   sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
    7   sudo yum install –y https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
    8   sudo yum-config-manager --enable rhui-REGION-rhel-server-extras
    9   sudo yum install -y docker-ce
   10  docker -v
   11  sudo systemctl enable docker
   12  sudo systemctl start docker
   13  history

Verify docker installation

[centos@ip-172-31-7-48 ~]$ which docker
/usr/bin/docker
[centos@ip-172-31-7-48 ~]$ which dockerd
/usr/bin/dockerd
[centos@ip-172-31-7-48 ~]$ which containerd
/usr/bin/containerd
[centos@ip-172-31-7-48 ~]$ ps -eaf|grep dockerd
root     10764     1  0 05:16 ?        00:00:00 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
centos   10920  1458  0 05:26 pts/0    00:00:00 grep --color=auto dockerd
[centos@ip-172-31-7-48 ~]$ ps -eaf|grep containerd
root     10753     1  0 05:16 ?        00:00:00 /usr/bin/containerd
root     10764     1  0 05:16 ?        00:00:00 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
centos   10922  1458  0 05:26 pts/0    00:00:00 grep --color=auto containerd
[centos@ip-172-31-7-48 ~]$ docker -v
Docker version 20.10.7, build f0df350
[centos@ip-172-31-7-48 ~]$

Assignment#1

Create Ubuntu Container

[centos@ip-172-31-7-48 ~]$ sudo -s
[root@ip-172-31-7-48 centos]# docker pull ubuntu
Using default tag: latest
latest: Pulling from library/ubuntu
a31c7b29f4ad: Pull complete
Digest: sha256:b3e2e47d016c08b3396b5ebe06ab0b711c34e7f37b98c9d37abe794b71cea0a2
Status: Downloaded newer image for ubuntu:latest
docker.io/library/ubuntu:latest

[root@ip-172-31-7-48 centos]# docker run -itd ubuntu
49a0ac7cce4a06ca475f26e8e8c27a4b564346cff412e22c394308d7a5397d74
[root@ip-172-31-7-48 centos]# docker ps -a
CONTAINER ID   IMAGE     COMMAND   CREATED         STATUS         PORTS     NAMES
49a0ac7cce4a   ubuntu    "bash"    6 seconds ago   Up 5 seconds             loving_goldwasser

Attaching to the container and Install Update, git & apache2 in ubuntu container

[root@ip-172-31-7-48 centos]# docker attach 49a0ac7cce4a
root@49a0ac7cce4a:/# yum install git
bash: yum: command not found
root@49a0ac7cce4a:/# apt-get update
root@49a0ac7cce4a:/# apt-get install apache2
root@49a0ac7cce4a:/# git --version
git version 2.25.1

Run git command in container from outside

ctrl+p+q - to come out from container
[root@ip-172-31-7-48 centos]# docker exec 49a0ac7cce4a git --version
git version 2.25.1

Assignment#2

Create a httpd container exposed at 8080 port

[root@ip-172-31-7-48 centos]# docker pull httpd
Using default tag: latest
latest: Pulling from library/httpd
Status: Downloaded newer image for httpd:latest
docker.io/library/httpd:latest
[root@ip-172-31-7-48 centos]# docker container run --name web -d -p 8080:80 httpd
3ec7d0b852ee41f4f1fe30ee075b79bdfadf9c4090adcd6945d2411ac5b771c2
[root@ip-172-31-7-48 centos]# docker ps -a
CONTAINER ID   IMAGE     COMMAND              CREATED         STATUS         PORTS                                   NAMES
3ec7d0b852ee   httpd     "httpd-foreground"   6 seconds ago   Up 5 seconds   0.0.0.0:8080->80/tcp, :::8080->80/tcp   web

Access(curl) container from node

[root@ip-172-31-7-48 centos]# curl localhost:8080
<html><body><h1>It works!</h1></body></html>
[root@ip-172-31-7-48 centos]# curl localhost:8081
curl: (7) Failed connect to localhost:8081; Connection refused
[root@ip-172-31-7-48 centos]# curl localhost:8080
<html><body><h1>It works!</h1></body></html>

Assignment#3

Create an image with base – centos and git must be installed in it

[root@ip-172-31-7-48 centos]# touch dockerfile
[root@ip-172-31-7-48 centos]# vi dockerfile
[root@ip-172-31-7-48 centos]# cat dockerfile
FROM ubuntu
MAINTAINER Swetha
ENV DEBIAN_FRONTEND=noninteractive
RUN apt-get update
RUN apt-get -y install tzdata
RUN apt-get update && apt-get install git -y && apt-get install -yq apache2
CMD /usr/sbin/apache2ctl -D FOREGROUND

[root@ip-172-31-7-48 centos]# docker build -t ub-up-git .
[root@ip-172-31-7-48 centos]# docker images
REPOSITORY   TAG       IMAGE ID       CREATED         SIZE
ub-up-git    latest    c226f4a2cae2   7 minutes ago   259MB
ubuntu       latest    c29284518f49   7 days ago      72.8MB

Push a docker image to hub.docker.com

[root@ip-172-31-7-48 centos]# docker tag ub-up-git swetha97/test21
[root@ip-172-31-7-48 centos]# docker images
REPOSITORY                TAG       IMAGE ID       CREATED          SIZE
swetha97/test21           latest    c226f4a2cae2   16 minutes ago   259MB
ub-up-git-by-dockerfile   latest    c226f4a2cae2   16 minutes ago   259MB
ub-up-git                 latest    c226f4a2cae2   16 minutes ago   259MB
ubuntu                    latest    c29284518f49   7 days ago       72.8MB

[root@ip-172-31-7-48 centos]# docker login
Login with your Docker ID to push and pull images from Docker Hub. If you don't have a Docker ID, head over to https://hub.docker.com to create one.
Username: swetha97
Password:
WARNING! Your password will be stored unencrypted in /root/.docker/config.json.
Configure a credential helper to remove this warning. See
https://docs.docker.com/engine/reference/commandline/login/#credentials-store
Login Succeeded
[root@ip-172-31-7-48 centos]# docker push swetha97/test21

https://hub.docker.com/r/swetha97/test21/tags?page=1&ordering=last_updated