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许多 Linux 发行版使用 systemd 来启动 Docker 守护进程（daemon）。本文档展示了一些如何定制 Docker 设置的例子。
启动 Docker 守护进程（daemon）
手动启动
一旦安装了 Docker，您将需要启动 Docker 守护进程。大多数 Linux 发行版都用systemctl来启动服务。如果您没有systemctl，请使用service命令。
systemctl：$ sudo systemctl启动docker
service：
$ sudo service docker start
在系统启动时自动启动
如果您希望 Docker 在启动时启动，请参阅配置 Docker 以在启动时启动。
自定义 Docker 守护进程（daemon）选项
有很多方法可以为你的 Docker 守护进程（daemon）配置守护进程标志和环境变量。推荐的方法是使用平台无关daemon.json文件，该文件默认位于Linux上/etc/docker/。请参阅守护程序（Daemon）配置文件。
您可以使用daemon.json配置几乎所有守护程序配置选项。以下示例配置了两个选项。您无法使用daemon.json机制配置的一件事是 HTTP 代理。
运行时间目录和存储驱动程序
您可能希望通过将 Docker 映像，容器和卷移动到单独的分区来控制用于 Docker 映像，容器和卷的磁盘空间。
要完成此操作，请在daemon.json文件中设置以下标志：
{ "graph": "/mnt/docker-data", "storage-driver": "overlay"}http/HTTPS 代理
Docker 守护程序（daemon）使用HTTP_PROXY，HTTPS_PROXY以及NO_PROXY环境变量在其启动环境来配置 HTTP 或 HTTPS 代理的行为。您无法配置
这些环境变量使用daemon.json文件。
此示例覆盖默认docker.service文件。
如果您位于 HTTP 或 HTTPS 代理服务器的后面，例如在公司设置中，则需要在 Docker systemd 服务文件中添加此配置。
1. 为 docker 服务创建一个 systemd 放置目录：
$ mkdir -p /etc/systemd/system/docker.service.d
2. 创建一个名为/etc/systemd/system/docker.service.d/http-proxy.conf的文件，添加HTTP_PROXY环境变量：
Service Environment="HTTP_PROXY=http://proxy.example.com:80/"
或者，如果您位于 HTTPS 代理服务器的后面，请创建一个名为/etc/systemd/system/docker.service.d/https-proxy.conf的文件以添加HTTPS_PROXY环境变量：
Service Environment="HTTPS_PROXY=https://proxy.example.com:443/"
1. 如果您有内部Docker注册表，您需要联系而无需代理，则可以通过NO_PROXY环境变量指定它们：
Environment =“HTTP_PROXY = http://proxy.example.com:80/”“NO_PROXY = localhost，127.0.0.1，docker -registry.somecorporation.com“
或者，如果您位于HTTPS代理服务器之后：
Environment =”HTTPS_PROXY = https://proxy.example.com:443/“”NO_PROXY = localhost，127.0.0.1，docker-registry.somecorporation .COM”
2. 冲洗更改：
$ sudo systemctl 守护进程重新加载
3. 重新启动Docker：$ sudo systemctl restart docker
4. 验证已加载配置：
$ systemctl show --property =环境docker Environment = HTTP_PROXY = http://proxy.example.com:80/
或者，如果您位于HTTPS代理服务器的后面：
$ systemctl show --property =Environment docker = HTTPS_PROXY = https://proxy.example.com:443/
手动创建 systemd 单元文件
在没有包的情况下安装二进制文件时，您可能需要将 Docker 与 systemd 集成。为此，将两个单元文件（service和socket）从 github 存储库安装到/etc/systemd/system。