如何将docker容器的根目录挂载为NFS挂载点

Question

我是 docker 的新手，我正在尝试将 docker 容器的根目录挂载为 NFS 挂载点。例如，我有一个 NFS 挂载点 test:/home/user/3243，我正在尝试：

docker run -it -v "test:/home/user/3243":/ centos7 /bin/bash

绝对，失败了。所以我尝试了这个：

mount -t nfs test:/home/user/3243 /mnt/nfs/3243
docker run -it -v /mnt/nfs/3243:/ centos7 /bin/bash

又失败了，怎么办？能解决吗？

Answer 1

目前在 issue 4213.

中讨论（自 2014 年中）

Jeroen van Bemmel (jbemmel) 最近的一个解决方法是：

It appears that NFS functionality depends on the underlying storage driver ( aufs, devicemapper, etc. ), as well as the sharing of file handles between processes ( see blog post "docker: devicemapper fix for “device or resource busy” (EBUSY)") i.e. 'unshare' may have an impact on NFS mounts.

I've moved away from using the 'MOUNTPOINT=/vm/nfs' as I am not sure if that event is even emitted.
Instead I created an upstart file like this:

cat > /etc/init/ecdn.conf << EOF
description "eCDN container"
author "Jeroen van Bemmel"
# mounted MOUNTPOINT=/vm/nfs doesn't seem to work, at least not the first time
start on started docker and virtual-filesystems
stop on starting rc RUNLEVEL=[016]
respawn
script
exec /usr/bin/docker start -a ecdn
end script

pre-stop script
/usr/bin/docker stop ecdn
# dont /usr/bin/docker rm ecdn
end script

EOF

and then create the container like this:

script -c "docker create -it --name='ecdn' --volume /vm:/usr/share/nginx/html/vm:ro image/name"

Answer 2

这里有几个问题：

不能挂载到容器的根目录。所以 docker run -v /foo:/ 永远行不通。
根据您第一次尝试的语法，-v test:/foo:bar、Docker 会认为这是要创建一个名为 "test" 的 "named" 卷。

您应该能够先执行 NFS 装载，然后执行 docker run -v /mnt/nfs/3243:/foo 以将 nfs 路径装载到 /foo。但是同样，你不能挂载到 /.

如何将docker容器的根目录挂载为NFS挂载点

How to mount the root directory of docker container as a NFS mount point

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