Docker : Install2021/08/30

	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:           20.10.5+dfsg1
 API version:       1.41
 Go version:        go1.15.9
 Git commit:        55c4c88
 Built:             Wed Aug  4 19:55:57 2021
 OS/Arch:           linux/amd64
 Context:           default
 Experimental:      true

Server:
 Engine:
  Version:          20.10.5+dfsg1
  API version:      1.41 (minimum version 1.12)
  Go version:       go1.15.9
  Git commit:       363e9a8
  Built:            Wed Aug  4 19:55:57 2021
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.4.5~ds1
  GitCommit:        1.4.5~ds1-2
 runc:
  Version:          1.0.0~rc93+ds1
  GitCommit:        1.0.0~rc93+ds1-5+b2
 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 official image

root@dlp:~#

docker pull debian

Using default tag: latest
latest: Pulling from library/debian
4c25b3090c26: Pull complete
Digest: sha256:38988bd08d1a5534ae90bea146e199e2b7a8fca334e9a7afe5297a7c919e96ea
Status: Downloaded newer image for debian:latest
docker.io/library/debian:latest

# run echo inside Container

root@dlp:~#

docker run debian /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 debian /bin/bash

root@ba4533419177:/#

# Container's console

root@ba4533419177:/#

uname -a

Linux ba4533419177 5.10.0-8-amd64 #1 SMP Debian 5.10.46-4 (2021-08-03) x86_64 GNU/Linux
root@ba4533419177:/#

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 debian /bin/bash

root@dac89ef4566a:/# root@dlp:~#

# Ctrl+p, Ctrl+q key

# show docker processes

root@dlp:~#

docker ps

CONTAINER ID   IMAGE     COMMAND       CREATED          STATUS          PORTS     NAMES
dac89ef4566a   debian    "/bin/bash"   18 seconds ago   Up 17 seconds             objective_brahmagupta

# connect to container's session

root@dlp:~#

docker attach dac89ef4566a

root@dac89ef4566a:/#

# shutdown container's process from Host's console

root@dlp:~#

docker kill dac89ef4566a

dac89ef4566a
root@dlp:~#

docker ps

CONTAINER ID   IMAGE     COMMAND   CREATED   STATUS    PORTS     NAMES

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