Mounting volumes for an Application

We can use the blow command to create volumes and mount the created volumes. Drycc create volume support ReadWriteMany, so before deploying drycc, you need to have a StorageClass ready which can support ReadWriteMany. Deploying drycc, set controller.appStorageClass to this StorageClass.

Use drycc volumes to mount a volume for a deployed application’s processes.

$ drycc help volumes
Valid commands for volumes:

add              create a volume for the application
expand           expand a volume for the application
list             list volumes in the application
info             print information about a volume
remove           delete a volume from the application
client           the client used to manage volume files
mount            mount a volume to process of the application
unmount          unmount a volume from process of the application

Use 'drycc help [command]' to learn more.

Create a volume for the application

You can create a csi volume with the drycc volumes add command.

$ drycc volumes add myvolume 200M
Creating myvolume to scenic-icehouse... done

Or use an existing nfs server

$ drycc volumes add mynfsvolume 200M -t nfs --nfs-server=nfs.drycc.com --nfs-path=/
Creating mynfsvolume to scenic-icehouse... done

Or maybe use an existing oss3

$ drycc volumes add myossvolume 200M -t oss --oss-server=oss.drycc.com --oss-bucket=vbucket --oss-access-key=ak --oss-secret-key=sk
Creating myossvolume to scenic-icehouse... done

List volumes in the application

After volume is created, you can list the volumes in this application.

$ drycc volumes list
NAME          OWNER    TYPE    PTYPE    PATH     SIZE
myvolume      admin    csi                       200M
mynfsvolume   admin    nfs                       200M
myossvolume   admin    oss                       200M

Mount a volume

The volume which is named myvolume is created, you can mount the volume with process of the application, use the command of drycc volumes mount. When volume is mounted, a new release will be created and deployed automatically.

$ drycc volumes mount myvolume web=/data/web
Mounting volume... done

And use drycc volumes list show mount detail.

$ drycc volumes list
NAME       OWNER    TYPE    PTYPE    PATH         SIZE
myvolume   admin    nfs     web      /data/web    200M

If you don’t need the volume, use drycc volumes unmount to unmount the volume and then use drycc volumes remove to delete the volume from the application. Before deleting volume, the volume has to be unmounted.

$ drycc volumes unmount myvolume web
Unmounting volume... done

$ drycc volumes remove myvolume
Deleting myvolume from scenic-icehouse... done

Use volume client to manage volume files.

Assume the volume which is named myvolume is created and mounted.

Prepare a file named testfile.

$ echo "testtext" > testfile

Upload. $ drycc volumes client cp testfile vol://myvolume/ [↑] testfile 100% [==================================================] (5/ 5 B, 355 B/s)

List files in myvolume.

$ drycc volumes client ls vol://myvolume/
[2024-07-22T15:32:28+08:00]    5    testfile

Delete testfle in myvolume.

$ drycc volumes client rm vol://myvolume/testfile