Use existing directory with convoy NFS


#1

I started playing with convoy NFS to solve a challenge I’m facing with moving some of our environments over to docker. This is all within the context of Rancher.

I notice that, when I create a new convoy-nfs stack in Rancher, each volume I create within this new driver creates a directory with that name. I realized that I can create a volume with a name where the directory already exists. However, I am concerned about convoy-nfs wanting to manage this top level directory.

I have several systems which have to access data stored on NFS. And this NFS directory must never ever be removed, this would be extremely bad. But applications need to be able to have RW access to the directory.

The basic question:
Can I not use convoy-nfs to point to an existing directory and mount this into a container without convoy-nfs wanting to “completely take it over”?

For example, imagine my NFS server exporting the following: /var/storage/somedata

I want this “somedata” NFS folder to be accessible to a container. The way I understand this so far means, I have to change my export completely in that I now export “/var/storage” instead of “/var/storage/somedata”. Then, when creating a container, I create a volume called “somedata”.
This would work, but I am still concerned that if anyone ever removed/purged this volume, convoy-nfs would attempt to remove the “somedata” directory.

Is there no way where I can use convoy-nfs (within Rancher) to simply point to an existing directory without having to change my exports on the NFS server to export one level higher (which may not always be an option on our storage array).

Thank you!


#2

Hi folks

I am sorry for doing a “bump”-reply on this. I’d really love some input on that as this is the main stumbling block I currently have and it prevents me from rolling out convoy-nfs. Currently, I’d be stuck literally doing mounts from inside my containers, and this just feels dirty to me (having to run rpcbind, rpc.statd inside each of my containers which need NFS).

If my question is unclear, please let me know and I will attempt to rephrase it :wink:

Samuel


Dynamic volume names for service container instances
#3

I would love to hear the answer to this question. Using convoy to mount pre-existing NFS data into containers would be very useful.