NFS Mounted Volume Plugin

This is a managed Docker volume plugin to allow Docker containers to access an NFS mount without installing NFS on the host.

Caveats:

• This is a managed plugin only, no legacy support.
• This will mount the /sys/fs/cgroup folder of the host and expose it to the plugin as read only. /sys/fs/cgroup is needed for systemd integration to work.
• In order to properly support versions use --alias when installing the plugin.
• There is no robust error handling. So garbage in -> garbage out

How to use

In order to not make this a free-for-all, only the device option is recognized. Any mount options need to be set up as part of the plugin. Multiple copies of the plugin can co-exist with different options under different aliases.

The plugin supports the following settings:

• DEFAULT_NFSOPTS this corresponds to the default value -o parameter of the mount command. It will be treated as a single string so it cannot inject the mount points or devices.

When installinng, it is recommended that a PLUGINALIAS is specified so that you would know what it is for and can easily control multiple copies of it. This can be done in an automated fashion as:

docker plugin install --alias PLUGINALIAS \
  trajano/nfs-volume-plugin \
  --grant-all-permissions --disable
docker plugin set PLUGINALIAS DEFAULT_NFSOPTS=hard,proto=tcp,nfsvers=4,intr
docker plugin enable PLUGINALIAS

Example in docker-compose.yml:

volumes:
  sample:
    driver: PLUGINALIAS
    driver_opts:
      device: "server1:/share_name"
    name: "whatever_name_you_want"

Which yields the following command

mount -t nfs -o hard,proto=tcp,nfsvers=4,intr server1:/share_name /generated_mount_point

Testing outside the swarm

This is an example of mounting and testing a store outside the swarm. It is assuming the share is called 192.168.1.1:/mnt/routerdrive/nfs.

docker plugin install trajano/nfs-volume-plugin --grant-all-permissions
docker plugin enable trajano/nfs-volume-plugin
docker volume create -d trajano/nfs-volume-plugin --opt device=192.168.1.1:/mnt/routerdrive/nfs --opt nfsopts=hard,proto=tcp,nfsvers=3,intr,nolock nfsmountvolume
docker run -it -v nfsmountvolume:/mnt alpine