How to mount NFS share before starting docker service ?

Solution In Progress - Updated -

Environment

  • Red Hat Enterprise Linux 7
  • docker

Resolution

  • There may be situations where the docker containers may be in need of NFS shares to be mounted even before the containers are started
  • nfs mount can be specified as a prerequisite for docker service to start. This can be done by editing the service file for docker
  • Run the command # systemctl list-units -t mount | grep <mount-point>. This will fetch an output with the unit name. Consider a sample example like below,
Raw
# systemctl list-units -t mount | grep /run/user/6656
run-user-6656.mount      loaded     active      mounted      /run/user/6656
  • In this case /run/user/6656 is the mount point and run-user-6656.mount is the unit name. This unit name needs to be specified as a prerequisite in the docker service file
  • Open the docker service file and edit the lines as below,
Raw
[Unit]
Requires=<unit-name>
After=<unit-name>

Reload the daemon by running # systemctl daemon-reload. Try rebooting the host now and the nfs should be mounted before docker service is started.

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