1. 查看是否已經安裝Docker

打開一個terminal控制臺，直行 sudo docker run hello-world 命令，若控制臺有以下信息輸出，則表示docker已經安裝了

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 theexecutable that produces the output you are currently reading.4. The Docker daemon streamed that output to the Docker client, which sent itto your terminal.To try something more ambitious, you can run an Ubuntu container with:$ docker run -it ubuntu bashShare 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/

2. 安裝Docker

按照以下步驟進行安裝，Docker 安裝文檔

Installation methods You can install Docker Engine in different ways, depending on your needs:Most users set up Docker’s repositories and install from them, for ease of installation and upgrade tasks. This is the recommended approach.Some users download the DEB package and install it manually and manage upgrades completely manually. This is useful in situations such as installing Docker on air-gapped systems with no access to the internet.In testing and development environments, some users choose to use automated convenience scripts to install Docker.

• Install using the repository
• Install from a package
• Install using the convenience script
  ``

本文使用Install using the repository方法安裝

$ apt-cache madison docker-cedocker-ce | 5:19.03.12~3-0~ubuntu-xenial | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 5:19.03.11~3-0~ubuntu-xenial | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 5:19.03.10~3-0~ubuntu-xenial | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 5:19.03.9~3-0~ubuntu-xenial | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 5:19.03.8~3-0~ubuntu-xenial | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 5:19.03.7~3-0~ubuntu-xenial | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 5:19.03.6~3-0~ubuntu-xenial | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 5:19.03.5~3-0~ubuntu-xenial | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 5:19.03.4~3-0~ubuntu-xenial | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 5:19.03.3~3-0~ubuntu-xenial | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 5:19.03.2~3-0~ubuntu-xenial | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 5:19.03.1~3-0~ubuntu-xenial | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 5:19.03.0~3-0~ubuntu-xenial | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 5:18.09.9~3-0~ubuntu-xenial | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 5:18.09.8~3-0~ubuntu-xenial | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 5:18.09.7~3-0~ubuntu-xenial | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 5:18.09.6~3-0~ubuntu-xenial | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 5:18.09.5~3-0~ubuntu-xenial | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 5:18.09.4~3-0~ubuntu-xenial | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 5:18.09.3~3-0~ubuntu-xenial | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 5:18.09.2~3-0~ubuntu-xenial | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 5:18.09.1~3-0~ubuntu-xenial | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 5:18.09.0~3-0~ubuntu-xenial | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 18.06.3~ce~3-0~ubuntu | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 18.06.2~ce~3-0~ubuntu | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 18.06.1~ce~3-0~ubuntu | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 18.06.0~ce~3-0~ubuntu | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 18.03.1~ce-0~ubuntu | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 18.03.0~ce-0~ubuntu | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 17.12.1~ce-0~ubuntu | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 17.12.0~ce-0~ubuntu | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 17.09.1~ce-0~ubuntu | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 17.09.0~ce-0~ubuntu | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 17.06.2~ce-0~ubuntu | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 17.06.1~ce-0~ubuntu | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 17.06.0~ce-0~ubuntu | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 17.03.3~ce-0~ubuntu-xenial | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 17.03.2~ce-0~ubuntu-xenial | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 17.03.1~ce-0~ubuntu-xenial | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packagesdocker-ce | 17.03.0~ce-0~ubuntu-xenial | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packages

我選擇的是最新的是第一個 “5:19.03.10_3-0ubuntu-xenial”，執行以下指令完成安裝：

$ sudo apt-get install docker-ce=5:19.03.10~3-0~ubuntu-xenial docker-ce-cli=5:19.03.10~3-0~ubuntu-xenial containerd.io

執行以下指令測試是否安裝成功：

$ sudo docker run hello-world

安裝完成之后的docker只有root用戶可以使用，其他用戶使用時只能加sudo。在網頁中，可以看到以下內同，在Install from a package之后：

Docker Engine is installed and running. The docker group is created but no users are added to it. You need to use sudo to run Docker commands. Continue to Post-installation steps for Linux to allow non-privileged users to run Docker commands and for other optional configuration steps.

點擊 Post-installation steps for Linux進入新的頁面，執行相關配置。

給當前用戶配置超級用戶訪問權限

Create the docker group. $ sudo groupadd dockerAdd your user to the docker group. $ sudo usermod -aG docker $USER

總結

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