Installation

Method 1 - Convenience Script

$ curl -fsSL https://get.docker.com -o get-docker.sh
$ sudo sh get-docker.sh
<...>

If you would like to use Docker as a non-root user,

Approach 1

$ sudo sh -eux <<EOF
# Install newuidmap & newgidmap binaries
apt-get install -y uidmap
EOF

$  dockerd-rootless-setuptool.sh install

# Verify that you can run docker commands without sudo.
$ docker run hello-world

Approach 2

you should now consider adding your user to the “docker” group with something like:

$ sudo usermod -aG docker ${USER}

# 将当前用户切换到docker组中，且立即生效
$ newgrp docker

# Verify that you can run docker commands without sudo.
$ docker run hello-world

Method 2 - Using Repository

Before you install Docker Engine for the first time on a new host machine, you need to set up the Docker apt repository. Afterward, you can install and update Docker from the repository.

Set up Docker’s apt repository.

# Add Docker's official GPG key:
sudo apt-get update
sudo apt-get install ca-certificates curl
sudo install -m 0755 -d /etc/apt/keyrings
sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
sudo chmod a+r /etc/apt/keyrings/docker.asc

# Add the repository to Apt sources:
echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu \
  $(. /etc/os-release && echo "${UBUNTU_CODENAME:-$VERSION_CODENAME}") stable" | \
  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
sudo apt-get update

Install the Docker packages.

To install the latest version, run:

$ sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

Verify that the installation is successful by running the hello-world image:

$ sudo docker run hello-world

This command downloads a test image and runs it in a container. When the container runs, it prints a confirmation message and exits.

Manage Docker as a non-root user

To create the docker group and add your user:

Create the docker group.

$ sudo groupadd docker

Add your user to the docker group.

$ sudo usermod -aG docker $USER

Run the following command to activate the changes to groups:

$ newgrp docker

Verify that you can run docker commands without sudo.

$ docker run hello-world

Uninstall Docker Engine

Uninstall the Docker Engine, CLI, and Containerd packages:

$ sudo apt-get purge docker-ce docker-ce-cli containerd.io

Images, containers, volumes, or customized configuration files on your host are not automatically removed. To delete all images, containers, and volumes:
```
$ sudo rm -rf /var/lib/docker
$ sudo rm -rf /var/lib/containerd
```

You must delete any edited configuration files manually.

管理

Start the Docker daemon

Start manually

Once Docker is installed, you need to start the Docker daemon. Most Linux distributions use systemctl to start services.

$ sudo systemctl start docker

Reference

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【Linux】Ubuntu 安装 Docker