Docker Volume with NFS

  Creating a Docker volume that uses NFS and mounting it in a Docker container involves multiple steps. Here's a complete example of how...

 Creating a Docker volume that uses NFS and mounting it in a Docker container involves multiple steps. Here's a complete example of how to create an NFS volume, mount it in a Docker container, and test it:

Assumptions:

• You have a server with NFS configured and a shared directory.
• You have Docker installed on both the server and the client.

1. Set Up NFS Server:

   On the server, ensure that NFS is installed and configured to export a directory. Edit /etc/exports to include a line like:

   /path/to/shared/folder *(rw,sync,no_subtree_check,no_root_squash)
   

   Replace /path/to/shared/folder with the actual path to the shared directory. After editing the file, restart the NFS server:

   sudo systemctl restart nfs-kernel-server

2. Mount NFS Share on Client:

   On the client machine, mount the NFS share:

   sudo mount -t nfs -o nfsvers=4 SERVER_IP:/path/to/shared/folder /mnt/nfs

   Replace SERVER_IP with the IP address or hostname of the NFS server.

3. Create a Docker Volume Using NFS:

   On the client machine where Docker is installed, create a Docker volume that uses NFS:

   docker volume create --driver local \
   --opt type=nfs \
   --opt o=addr=SERVER_IP,rw \
   --opt device=:/path/to/shared/folder \
   my-nfs-volume
   • --opt type=nfs: Specifies the volume type as NFS.
   • --opt o=addr=SERVER_IP,rw: Specifies the NFS server address and read-write permissions.
   • --opt device=:/path/to/shared/folder: Specifies the NFS mount path.

4. Run a Docker Container with the NFS Volume:

   Now, you can run a Docker container that uses the NFS volume:

   docker run -d --name my-container -v my-nfs-volume:/data nginx

   In this example, an NGINX container is started with the /data directory mounted to the my-nfs-volume.

5. Test the NFS Volume:

   Inside the container, you can create, read, and write files in the mounted NFS volume. For example:

   # Attach to the running container
   docker exec -it my-container sh
   
   # Create a test file in the NFS volume
   echo "Hello, NFS!" > /data/test.txt
   
   # Check if the file exists
   cat /data/test.txt

   You should see the "Hello, NFS!" message, confirming that the container can read and write to the NFS volume.

That's it! You have successfully created an NFS volume, mounted it in a Docker container, and verified that the container can access the shared NFS data. This setup allows you to share data between containers running on different hosts using NFS as the storage backend.