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Docker 引擎管理的插件系统
安装和使用插件
开发一个插件
调试插件
Docker Engine 的插件系统允许您使用 Docker Engine 安装，启动，停止和移除插件。
有关 Docker Engine 1.12及更早版本中提供的传统插件系统的信息，请参阅了解传统 Docker 引擎插件。
注意：Windows 守护程序目前不支持 Docker Engine 托管插件。
安装和使用插件
插件以 Docker 镜像的形式发布，可以托管在 Docker Hub 或私有注册表中。
要安装插件，请使用docker plugin install从 Docker Hub 或您的私人注册表中提取插件的命令，并在必要时提示您授予权限或功能，并启用该插件。
要检查已安装插件的状态，请使用该docker plugin ls命令。成功启动的插件在输出中列为启用。
在安装插件之后，您可以将其用作另一个 Docker 操作的选项，例如创建卷。
在以下示例中，您将安装sshfs插件，验证它是否已启用，并使用它来创建卷。
注意：本示例仅用于说明目的。创建卷后，在检查卷时，远程主机的SSH密码将作为纯文本公开。您应该在完成示例后立即删除该卷。
安装
sshfs插件。$ docker 插件安装 vieux / sshfs 插件“vieux / sshfs”正在请求以下权限： - network：host - capabilities：CAP_SYS_ADMIN 您是否授予上述权限？y / N y vieux / sshfs 该插件请求2个权限：
- It needs access to the `host` network.- It needs the `CAP_SYS_ADMIN` capability, which allows the plugin to run the `mount` command.
检查插件是否在输出中启用
docker plugin ls。$ docker plugin ls ID名称标签说明已启用69553ca1d789 vieux / sshfs最新sshfs插件true使用插件创建一个卷。本示例将
/remote主机上的目录挂载1.2.3.4到名为的卷中sshvolume。该卷现在可以安装到容器中。$ docker volume create \ -d vieux / sshfs \ --name sshvolume \ -o sshcmd=user@1.2.3.4：/ remote \ -o password = $（cat file_containing_password_for_remote_host）sshvolume确认卷已成功创建。$ docker卷ls DRIVER名称vieux / sshfs sshvolume
启动一个使用该卷的容器
sshvolume。$ docker run --rm -v sshvolume：/ data busybox ls / data <机器上的/ remote的内容1.2.3.4>删除卷
sshvolumedocker卷rm sshvolume sshvolume要禁用某个插件，请使用该docker plugin disable命令。要完全删除它，请使用该docker plugin remove命令。有关其他可用的命令和选项，请参阅命令行参考。
开发一个插件
rootfs 目录
rootfs目录代表插件的根文件系统。在这个例子中，它是从 Dockerfile 创建的：
注意：
/run/docker/plugins目录在插件的文件系统内部用于 docker 与插件进行通信。
$ git clone https://github.com/vieux/docker-volume-sshfs $ cd docker-volume-sshfs $ docker build -t rootfsimage .$ id=$(docker create rootfsimage true) # id was cd851ce43a403 when the image was created $ sudo mkdir -p myplugin/rootfs $ sudo docker export "$id" | sudo tar -x -C myplugin/rootfs $ docker rm -vf "$id"$ docker rmi rootfsimage
config.json 文件
config.json文件描述了该插件。请参阅插件配置参考。
考虑下面的config.json文件。
{"description": "sshFS plugin for Docker","documentation": "https://docs.docker.com/engine/extend/plugins/","entrypoint": ["/docker-volume-sshfs"],"network": { "type": "host" },"interface" : { "types": ["docker.volumedriver/1.0"], "socket": "sshfs.sock"},"linux": {"capabilities": ["CAP_SYS_ADMIN"]}}这个插件是一个音量驱动程序。它需要一个host网络和CAP_SYS_ADMIN能力。它取决于/docker-volume-sshfs入口点并使用/run/docker/plugins/sshfs.sock套接字与Docker引擎进行通信。这个插件没有运行时参数。
创建插件
通过运行docker plugin create <plugin-name> ./path/to/plugin/data插件数据包含插件配置文件config.json和子目录中的根文件系统，可以创建一个新的插件rootfs。
之后，插件<plugin-name>将显示在docker plugin ls。可以使用插件将插件推送到远程注册表docker plugin push <plugin-name>。
调试插件
插件的 stdout 被重定向到 dockerd 日志。这些条目有一个plugin=<ID>后缀。以下是docker f52a3df433b9aceee436eaada0752f5797aab1de47e5485f1690a073b860ff62守护程序日志中 pluginID 及其相应日志条目的几个命令示例。
$ docker plugin install tiborvass/sample-volume-plugins INFO[0036] Starting... Found 0 volumes on startup plugin=f52a3df433b9aceee436eaada0752f5797aab1de47e5485f1690a073b860ff62
$ docker volume create -d tiborvass/sample-volume-plugins samplevol INFO[0193] Create Called... Ensuring directory /data/samplevol exists on host... plugin=f52a3df433b9aceee436eaada0752f5797aab1de47e5485f1690a073b860ff62 INFO[0193] open /var/lib/docker/plugin-data/local-persist.json: no such file or directory plugin=f52a3df433b9aceee436eaada0752f5797aab1de47e5485f1690a073b860ff62 INFO[0193] Created volume samplevol with mountpoint /data/samplevol plugin=f52a3df433b9aceee436eaada0752f5797aab1de47e5485f1690a073b860ff62 INFO[0193] Path Called... Returned path /data/samplevol plugin=f52a3df433b9aceee436eaada0752f5797aab1de47e5485f1690a073b860ff62
$ docker run -v samplevol:/tmp busybox sh INFO[0421] Get Called... Found samplevol plugin=f52a3df433b9aceee436eaada0752f5797aab1de47e5485f1690a073b860ff62 INFO[0421] Mount Called... Mounted samplevol plugin=f52a3df433b9aceee436eaada0752f5797aab1de47e5485f1690a073b860ff62 INFO[0421] Path Called... Returned path /data/samplevol plugin=f52a3df433b9aceee436eaada0752f5797aab1de47e5485f1690a073b860ff62 INFO[0421] Unmount Called... Unmounted samplevol plugin=f52a3df433b9aceee436eaada0752f5797aab1de47e5485f1690a073b860ff62
使用 docker-runc 将日志文件和 shell 获取到插件中。
docker-runc，默认的 docker 容器运行时可用于调试插件。如果插件日志被重定向到文件，这特别有用。
$ docker-runc list ID PID STATUS BUNDLE CREATED f52a3df433b9aceee436eaada0752f5797aab1de47e5485f1690a073b860ff62 2679 running /run/docker/libcontainerd/f52a3df433b9aceee436eaada0752f5797aab1de47e5485f1690a073b860ff622017-02-06T21:53:03.031537592Z r
$ docker-runc exec f52a3df433b9aceee436eaada0752f5797aab1de47e5485f1690a073b860ff62 cat /var/log/plugin.log
如果插件具有内置的 shell，那么可以按照如下方式执行插件：
$ docker-runc exec -t f52a3df433b9aceee436eaada0752f5797aab1de47e5485f1690a073b860ff62 sh
使用 curl 调试插件套接字问题。
要验证 docker 守护程序与之通信的插件 API 套接字是否响应，请使用 curl。在本例中，我们将使用 curl 7.47.0 从 docker 主机到卷和网络插件进行 API 调用，以确保插件正在侦听所述套接字。对于运行良好的插件，这些基本要求应该可以工作。请注意，插件套接字在主机下可用/var/run/docker/plugins/<pluginID>
curl -H "Content-Type: application/json" -XPOST -d '{}' --unix-socket /var/run/docker/plugins/e8a37ba56fc879c991f7d7921901723c64df6b42b87e6a0b055771ecf8477a6d/plugin.sock http:/VolumeDriver.List{"Mountpoint":"","Err":"","Volumes":[{"Name":"myvol1","Mountpoint":"/data/myvol1"},{"Name":"myvol2","Mountpoint":"/data/myvol2"}],"Volume":null}curl -H "Content-Type: application/json" -XPOST -d '{}' --unix-socket /var/run/docker/plugins/45e00a7ce6185d6e365904c8bcf62eb724b1fe307e0d4e7ecc9f6c1eb7bcdb70/plugin.sock http:/NetworkDriver.GetCapabilities{"Scope":"local"}当使用 curl 7.5或更高版本时，URL应该是表单的形式http://hostname/APICall，其中hostname是安装插件的有效主机名，并且APICall是对插件 API 的调用。
例如， http://localhost/VolumeDriver.List