Storage in a Cluster for Docker Swarm Using Sshfs

Install the vieux/sshfs plugin on all nodes in the swarm.

docker plugin install --grant-all-permissions vieux/sshfs

Set up an additional server to use for storage. You can use the Ubuntu 18.04 Bionic Beaver LTS image with a size of Small. On this new storage server, create a directory with a file that can be used for testing.
```
mkdir /home/cloud_user/external
echo External storage! > /home/cloud_user/external/message.txt
```
On the swarm manager, manually create a Docker volume that uses the external storage server for storage. Be sure to replace the text <STORAGE_SERVER_PRIVATE_IP> and <PASSWORD> with actual values.
```
docker volume create --driver vieux/sshfs \
  -o sshcmd=cloud_user@<STORAGE_SERVER_PRIVATE_IP>:/home/cloud_user/external \
  -o password=<PASSWORD> \
  sshvolume

docker volume ls
```

Create a service that automatically manages the shared volume, creating the volume on swarm nodes as needed. Be sure to replace the text <STORAGE_SERVER_PRIVATE_IP> and <PASSWORD> with actual values.

docker service create \
  --replicas=3 \
  --name storage-service \
  --mount volume-driver=vieux/sshfs,source=cluster-volume,destination=/app,volume-opt=sshcmd=cloud_user@<STORAGE_SERVER_PRIVATE_IP>:/home/cloud_user/external,volume-opt=password=<PASSWORD> busybox cat /app/message.txt

Check the service logs to verify that the service is reading the test data from the external storage server.
```
docker service logs storage-service
```

Tutorial

Storage in a Cluster for Docker Swarm Using Sshfs

Getting Started with Docker Stacks

Getting Started with Node Labels In Docker Swarm

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