docker - 通过SSH挂载远程Docker上下文的卷

Question

我正在通过带有远程上下文的docker-compose部署一些Docker服务。我将其配置为使用SSH:

docker context create remote --docker "host=ssh://user@my.remote.host"
docker context use remote

在远程主机上，我有多个要挂载到Docker中的配置文件。当我尝试使用docker CLI时，它工作正常:

docker run -v /home/user/run:/test -it alpine:3.11

# ls -la /test
-> shows remote files correctly here

但是，当我使用带有配置文件的docker-compose启动它时:

version: "3.3"
services:
  nginx:
    image: nginx:1.17.10-alpine
    container_name: nginx
    restart: unless-stopped
    volumes:
      - ${HOME}/run/nginx.conf:/etc/nginx/nginx.conf
    ports:
      - "80:80"
      - "443:443"

由于某种原因，它试图挂载本地文件而不是远程文件，并因错误而失败:

ERROR: for nginx  Cannot start service nginx: OCI runtime create failed: container_linux.go:296: starting container process caused "process_linux.go:398: container init caused \"rootfs_linux.go:58: mounting \\\"/home/local-user/run/nginx.conf\\\" to rootfs \\\"/hdd/docker/overlay2/c869ef9f2c983d33245fe1b4360eb602d718786ba7d0245d36c40385f7afde65/merged\\\" at \\\"/hdd/docker/overlay2/c869ef9f2c983d33245fe1b4360eb602d718786ba7d0245d36c40385f7afde65/merged/etc/nginx/nginx.conf\\\" caused \\\"not a directory\\\"\"": unknown: Are you trying to mount a directory onto a file (or vice-versa)? Check if the specified host path exists and is the expected type

是否可以通过类似于标准Docker CLI的docker-compose挂载远程资源？

Answer 1

您需要显式设置DOCKER_HOST以从docker-compose访问您的远程docker主机。
从撰写文档中
Compose CLI environment variables

DOCKER_HOST

Sets the URL of the docker daemon. As with the Docker client, defaults to unix:///var/run/docker.sock.

在给定的情况下，docker context use remote将当前上下文设置为remote
仅适用于您的docker命令。 docker-compose仍然使用您的默认(本地)上下文。为了使docker-compose能够检测到它，您必须通过DOCKER_HOST环境变量传递它。
例:

$ export DOCKER_HOST=ssh://user@my.remote.host
$ docker-compose up