Docker Image: Ubuntu

  • Get the Ubuntu Docker image

    docker pull ubuntu

Using default tag: latest
latest: Pulling from library/ubuntu
a70d879fa598: Pull complete
10e6159c56c0: Pull complete
Digest: sha256:3c9c713e0979e9bd6061ed52ac1e9e1f246c9495aa063619d9d695fb8039aa1f
Status: Downloaded newer image for ubuntu:latest
docker.io/library/ubuntu:latest

  • Show a list of previously downloaded docker images

    docker images

REPOSITORY                     TAG          IMAGE ID       CREATED       SIZE
docker101tutorial              latest       ac415588360d   4 days ago    28MB
camunda/camunda-bpm-platform   run-latest   c1b49a5b4227   10 days ago   243MB
stonebranch/universal-agent    latest       eca81e31c6a3   11 days ago   1.53GB
busybox                        latest       388056c9a683   11 days ago   1.23MB
ubuntu                         latest       26b77e58432b   2 weeks ago   72.9MB

  • Start a detached container based on the ubuntu image with a friendly name of MyUbuntuContainer

    docker run -t -d --name MyUbuntuContainer ubuntu

2a20d14e8c8a6d47ff99df07212759b48e93451c74ec81e0b0d0769d9808b56e

  • Show list of all docker containers

    docker ps --all

CONTAINER ID   IMAGE                                     COMMAND                  CREATED             STATUS             PORTS                                        NAMES
2a20d14e8c8a   ubuntu                                    "/bin/bash"              26 seconds ago      Up 26 seconds                                                   MyUbuntuContainer
b57fbf4820d7   stonebranch/universal-agent:latest        "./ua_entrypoint"        About an hour ago   Up About an hour   7878/tcp, 7887/tcp                           My-UAG1
647c71dd239e   camunda/camunda-bpm-platform:run-latest   "/sbin/tini -- ./cam…"   4 days ago          Up 7 hours         8000/tcp, 9404/tcp, 0.0.0.0:8080->8080/tcp   MyCamunda

  • Start an interactive bash shell within the container.

    docker exec -it MyUbuntuContainer bash

root@2a20d14e8c8a:/#

  • Now run some commands within the interactive shell e.g., hostname, id, ls -l:

    root@2a20d14e8c8a:/# hostname             (1)
2a20d14e8c8a
root@2a20d14e8c8a:/#

root@2a20d14e8c8a:/# id                   (2)
uid=0(root) gid=0(root) groups=0(root)
root@2a20d14e8c8a:/#

root@2a20d14e8c8a:/# ls -l                (3)
total 48
lrwxrwxrwx   1 root root    7 Apr  1 01:23 bin -> usr/bin
drwxr-xr-x   2 root root 4096 Apr 15  2020 boot
drwxr-xr-x   5 root root  360 Apr 19 23:33 dev
drwxr-xr-x   1 root root 4096 Apr 19 23:33 etc
drwxr-xr-x   2 root root 4096 Apr 15  2020 home
lrwxrwxrwx   1 root root    7 Apr  1 01:23 lib -> usr/lib
lrwxrwxrwx   1 root root    9 Apr  1 01:23 lib32 -> usr/lib32
lrwxrwxrwx   1 root root    9 Apr  1 01:23 lib64 -> usr/lib64
lrwxrwxrwx   1 root root   10 Apr  1 01:23 libx32 -> usr/libx32
drwxr-xr-x   2 root root 4096 Apr  1 01:23 media
drwxr-xr-x   2 root root 4096 Apr  1 01:23 mnt
drwxr-xr-x   2 root root 4096 Apr  1 01:23 opt
dr-xr-xr-x 192 root root    0 Apr 19 23:33 proc
drwx------   2 root root 4096 Apr  1 01:26 root
drwxr-xr-x   1 root root 4096 Apr  3 00:53 run
lrwxrwxrwx   1 root root    8 Apr  1 01:23 sbin -> usr/sbin
drwxr-xr-x   2 root root 4096 Apr  1 01:23 srv
dr-xr-xr-x  11 root root    0 Apr 19 23:33 sys
drwxrwxrwt   2 root root 4096 Apr  1 01:26 tmp
drwxr-xr-x   1 root root 4096 Apr  1 01:23 usr
drwxr-xr-x   1 root root 4096 Apr  1 01:26 var
    1 Execute the hostname command.
    2 Execute the id command.
    3 Execute the ls -l command.