docker--Install using the repository

Install using the repository

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

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

Set up the repository

1. Update the apt package index and install packages to allow apt to use a repository over HTTPS：

    $ sudo apt-get update
    $ sudo apt-get install \
       ca-certificates \
       curl \
       gnupg \
       lsb-release

2. Add Docker’s official GPG key

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

3. Use the following command to set up the stable repository. To add the nightly or test repository, add the word nightly or test (or both) after the word stable in the commands below

    $ 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 using the convenience script

You can run the script with the DRY_RUN=1 option to learn what steps the script will execute during installation:

$ curl -fsSL https://get.docker.com -o get-docker.sh
 DRY_RUN=1 sh ./get-docker.sh

 命令行显示如下：

amos@ubuntu:~$ DRY_RUN=1 sh ./get-docker.sh
# Executing docker install script, commit: 93d2499759296ac1f9c510605fef85052a2c32be
apt-get update -qq >/dev/null
DEBIAN_FRONTEND=noninteractive apt-get install -y -qq apt-transport-https ca-certificates curl >/dev/null
curl -fsSL "https://download.docker.com/linux/ubuntu/gpg" | gpg --dearmor --yes -o /usr/share/keyrings/docker-archive-keyring.gpg
echo "deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu focal stable" > /etc/apt/sources.list.d/docker.list
apt-get update -qq >/dev/null
DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends  docker-ce-cli docker-scan-plugin docker-ce >/dev/null
DEBIAN_FRONTEND=noninteractive apt-get install -y -qq docker-ce-rootless-extras >/dev/null
amos@ubuntu:~$