Ubuntu 26.04
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Docker : Install2026/05/08
 

Install Docker which is the Operating System-Level Virtualization Tool, which automates the deployment of applications inside Containers.

[1] Install Docker.
root@dlp:~#
apt -y install docker.io
root@dlp:~#
docker version 

Client:
 Version:           29.1.3
 API version:       1.52
 Go version:        go1.24.13
 Git commit:        29.1.3-0ubuntu4.1
 Built:             Wed Apr 29 16:40:20 2026
 OS/Arch:           linux/amd64
 Context:           default

Server:
 Engine:
  Version:          29.1.3
  API version:      1.52 (minimum version 1.44)
  Go version:       go1.24.13
  Git commit:       29.1.3-0ubuntu4.1
  Built:            Wed Apr 29 16:40:20 2026
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          2.2.2
  GitCommit:
 runc:
  Version:          1.4.0-0ubuntu1
  GitCommit:
 docker-init:
  Version:          0.19.0
  GitCommit:
[2] Download an official image and create a Container and output the words [Welcome to the Docker World] inside the Container.
# download the image

root@dlp:~#
docker pull ubuntu 
Using default tag: latest
latest: Pulling from library/ubuntu
1c24335ddd46: Pull complete
6f5c5aa4e145: Pull complete
9bcf140d7f0f: Download complete
Digest: sha256:f3d28607ddd78734bb7f71f117f3c6706c666b8b76cbff7c9ff6e5718d46ff64
Status: Downloaded newer image for ubuntu:latest
docker.io/library/ubuntu:latest
# run echo inside Container

root@dlp:~#
docker run ubuntu /bin/echo "Welcome to the Docker World!"

Welcome to the Docker World!
[3] Connect to the interactive session of a Container with [i] and [t] option like follows. If exit from the Container session, the process of a Container finishes.
root@dlp:~#
docker run -it ubuntu /bin/bash

root@34aa2b4c88ea:/#    
# Container's console

root@34aa2b4c88ea:/#
cat /etc/os-release 

PRETTY_NAME="Ubuntu 26.04 LTS"
NAME="Ubuntu"
VERSION_ID="26.04"
VERSION="26.04 (Resolute Raccoon)"
VERSION_CODENAME=resolute
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
UBUNTU_CODENAME=resolute
LOGO=ubuntu-logo
root@34aa2b4c88ea:/#
exit

exit
root@dlp:~#    
# come back
[4] If exit from the Container session with keeping container's process, push [Ctrl+p] and [Ctrl+q] key.
root@dlp:~#
docker run -it ubuntu /bin/bash

root@6684c3908337:/# root@dlp:~#    
# Ctrl+p, Ctrl+q
# show docker process

root@dlp:~#
docker ps 

CONTAINER ID   IMAGE     COMMAND       CREATED          STATUS          PORTS     NAMES
6684c3908337   ubuntu    "/bin/bash"   27 seconds ago   Up 26 seconds             brave_robinson
# connect to container's session

root@dlp:~#
docker attach 6684c3908337

root@6684c3908337:/#
# shutdown container's process from Host's console

root@dlp:~#
docker kill 6684c3908337

6684c3908337
root@dlp:~#
docker ps 

CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
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