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Install-Docker-on-Ubuntu-21.10.md

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Install Docker on Ubuntu 21.10

Check that you use Ubuntu 21.10

manlix@lab:~$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 21.10
Release:	21.10
Codename:	impish

Update APT cache

manlix@lab:~$ sudo apt update

Install dependencies

manlix@lab:~$ sudo apt install ca-certificates curl gnupg lsb-release

Add Docker GPG key

manlix@lab:~$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg

Add Docker repo

manlix@lab:~$ echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu \
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

Install Docker

 manlix@lab:~$ sudo apt update
 manlix@lab:~$ sudo apt install -y docker-ce docker-ce-cli containerd.io

Check Docker installed version

manlix@lab:~$ docker --version
Docker version 20.10.10, build b485636

Check Docker works properly

manlix@lab:~$ sudo docker run hello-world

Allow to run Docker under non-root account

Issue — non-root account is not allowing to run Docker:

manlix@lab:~$ docker ps
Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get http://%2Fvar%2Frun%2Fdocker.sock/v1.40/containers/json: dial unix /var/run/docker.sock: connect: permission denie

Reason — Docker socket is allowing to use only for root and group docker:

manlix@lab:~$ ls -l /var/run/docker.sock 
srw-rw---- 1 root docker 0 апр 25 14:13 /var/run/docker.sock

Solution — add yourself to group docker

manlix@lab:~$ sudo usermod -aG docker ${USER}

Login in to a docker group:

manlix@lab:~$ newgrp docker

And check that Docker is allowing ro run commands, for test it run command to list all containers (empty result is OK):

manlix@lab:~$ docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

Check Docker works fine — run first container hello-world:

manlix@lab:~$ docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
0e03bdcc26d7: Pull complete 
Digest: sha256:8e3114318a995a1ee497790535e7b88365222a21771ae7e53687ad76563e8e76
Status: Downloaded newer image for hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
    (amd64)
 3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:
 https://hub.docker.com/

For more examples and ideas, visit:
 https://docs.docker.com/get-started/

Originally from official docs: https://docs.docker.com/engine/install/ubuntu/