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## Ubuntu 安装 Docker CE
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## Install Docker CE on Ubuntu
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>警告：切勿在没有配置 Docker APT 源的情况下直接使用 apt 命令安装 Docker.
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>warning: Don't install Docker CE directly using apt without configuring Docker APT source.
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### 准备工作
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### Preparation
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#### 系统要求
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#### System requirements
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Docker CE 支持以下版本的 [Ubuntu](https://www.ubuntu.com/server) 操作系统：
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Docker CE supports [Ubuntu](https://www.ubuntu.com/server) versions:
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* Disco 19.04
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* Cosmic 18.10
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* Bionic 18.04 (LTS)
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* Xenial 16.04 (LTS)
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Docker CE 可以安装在 64 位的 x86 平台或 ARM 平台上。Ubuntu 发行版中，LTS（Long-Term-Support）长期支持版本，会获得 5 年的升级维护支持，这样的版本会更稳定，因此在生产环境中推荐使用 LTS 版本。
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Docker CE can be installed on x86 platform or ARM. In Ubuntu distributions, LTS (Long-Term-Support) will get 5 years updating support, distributions like this will be stable. Therefore, LTS version is recommended in production environment.
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#### 卸载旧版本
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#### Uninstall old version
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旧版本的 Docker 称为 `docker` 或者 `docker-engine`，使用以下命令卸载旧版本：
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Old version of Docker is called `docker` or `docker-engine`. Use the following command to uninstall the old version:
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```bash
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$ sudo apt-get remove docker \
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@ -25,9 +25,9 @@ $ sudo apt-get remove docker \
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docker.io
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```
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### 使用 APT 安装
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### Use APT to install
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由于 `apt` 源使用 HTTPS 以确保软件下载过程中不被篡改。因此，我们首先需要添加使用 HTTPS 传输的软件包以及 CA 证书。
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Because the `apt` source uses HTTPS to ensure that software downloads are not tampered with. Therefore, we need to add software packages and CA certificates that are transmitted using HTTPS first.
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```bash
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$ sudo apt-get update
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@ -39,19 +39,19 @@ $ sudo apt-get install \
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software-properties-common
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```
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鉴于国内网络问题，强烈建议使用国内源，官方源请在注释中查看。
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If you are in China, it is strongly recommended to use chinese sources. The official sources are in the comments.
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为了确认所下载软件包的合法性，需要添加软件源的 `GPG` 密钥。
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In order to confirm the validity of the downloaded package, we need to add the `GPG` key of the software source.
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```bash
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$ curl -fsSL https://mirrors.ustc.edu.cn/docker-ce/linux/ubuntu/gpg | sudo apt-key add -
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# 官方源
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# official
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# $ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
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```
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然后，我们需要向 `source.list` 中添加 Docker 软件源
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Then, we need to add Docker software source to `source.list`
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```bash
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$ sudo add-apt-repository \
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@ -60,18 +60,18 @@ $ sudo add-apt-repository \
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stable"
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# 官方源
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# official
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# $ sudo add-apt-repository \
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# "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
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# $(lsb_release -cs) \
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# stable"
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```
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>以上命令会添加稳定版本的 Docker CE APT 镜像源，如果需要测试或每日构建版本的 Docker CE 请将 stable 改为 test 或者 nightly。
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>The above commands will add stable Docker CE APT source. If you need test or nightly version of Docker, you can change the stable to test or nightly.
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#### 安装 Docker CE
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#### Install Docker CE
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更新 apt 软件包缓存，并安装 `docker-ce`：
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Update apt cache and install `docker-ce`:
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```bash
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$ sudo apt-get update
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@ -79,43 +79,43 @@ $ sudo apt-get update
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$ sudo apt-get install docker-ce
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```
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### 使用脚本自动安装
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### Auto install by script
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在测试或开发环境中 Docker 官方为了简化安装流程，提供了一套便捷的安装脚本，Ubuntu 系统上可以使用这套脚本安装：
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Docker Offical has provided a set of convenient install scripts which can be installed on Ubuntu system for test or dev environments.
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```bash
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$ curl -fsSL get.docker.com -o get-docker.sh
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$ sudo sh get-docker.sh --mirror Aliyun
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```
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执行这个命令后，脚本就会自动的将一切准备工作做好，并且把 Docker CE 的 Edge 版本安装在系统中。
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Script will make everythings ok and install Edge version of Docker CE for system after this command.
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### 启动 Docker CE
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### Launcher Docker CE
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```bash
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$ sudo systemctl enable docker
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$ sudo systemctl start docker
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```
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### 建立 docker 用户组
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### Add docker user group
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默认情况下，`docker` 命令会使用 [Unix socket](https://en.wikipedia.org/wiki/Unix_domain_socket) 与 Docker 引擎通讯。而只有 `root` 用户和 `docker` 组的用户才可以访问 Docker 引擎的 Unix socket。出于安全考虑，一般 Linux 系统上不会直接使用 `root` 用户。因此，更好地做法是将需要使用 `docker` 的用户加入 `docker` 用户组。
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Command `docker` uses [Unix socket](https://en.wikipedia.org/wiki/Unix_domain_socket) to communicate with Docker engine default. Only users of `root` and `docker` groups can communicate Unix socket of Docker engine.`root` user is not directly used on Linux systems in general for security. Therefore, it is better to add users who need to use `docker` to the `docker` user group.
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建立 `docker` 组：
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create `docker` group:
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```bash
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$ sudo groupadd docker
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```
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将当前用户加入 `docker` 组：
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add current user to `docker` group:
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```bash
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$ sudo usermod -aG docker $USER
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```
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退出当前终端并重新登录，进行如下测试。
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Exit current terminal and relogin to test.
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### 测试 Docker 是否安装正确
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### Test whether Docker is installed correctly
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```bash
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$ docker run hello-world
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@ -148,12 +148,12 @@ For more examples and ideas, visit:
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https://docs.docker.com/get-started/
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```
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若能正常输出以上信息，则说明安装成功。
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If it shows above message, it means successful installation.
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### 镜像加速
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### Registry Mirror(In China)
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如果在使用过程中发现拉取 Docker 镜像十分缓慢，可以配置 Docker [国内镜像加速](mirror.md)。
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If you pull docker images very slowly, then you can configurate [Registry Mirror](mirror.md).
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### 参考文档
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### Links
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* [Docker 官方 Ubuntu 安装文档](https://docs.docker.com/install/linux/docker-ce/ubuntu/)
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* [Offical Docker Innstall Doc](https://docs.docker.com/install/linux/docker-ce/ubuntu/)
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