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Re: file permissions changed in docker registry

I forwarded your problem on to our storage team lead, he had the following suggestions:

"I believe they will want to fiddle with the fsGroup or supplementalGroup so that it matches the GID of the cassandra user and make sure those GIDs are in the SCC ranges for the pod."

He also recommended you consider opening a bugzilla as it's easier to track these issues that way.

On Thu, Jul 5, 2018 at 7:42 AM, Tim Dudgeon <tdudgeon ml gmail com> wrote:
I hit this problem again, this time with the cassandra pod for Hawkular metrics.

This has been running without problem for some months, but now I found that the cassandra pod could not start because of file permissions writing to the /cassandra_data/data directory.

Looking at that directory the ownership was set to 1000040000.65534, but cassandra was running as user 313 so could not write to that directory. Manually changing permissions to 313.65534 (the 65534 group is nfsnobody, and the cassandra user is a member of that group) fixed the problem and allowed the cassandra pod to start.

Clearly the 1000040000 user is an openshift assigned user, but as the container is running as the cassandra user (313) I have no idea how this could have happened.

Can anyone explain what is going on here?


On 02/07/18 16:27, Tim Dudgeon wrote:
I've hit a strange problem with directory ownership for the docker registry a couple of times, and don't understand what is causing this.

The registry was working fine for some time. I'm using a Cinder volume for the registry storage, but don't know if that's relevant.
Then something happened that stopped pods pushing to the registry, with the problem being that the registry pod was getting "Permission denied" errors when it was trying to create directories under /registry/docker/registry/v2/repositories.

Looking at the file system the directories were all owned by 1000000000.1000000000 which explains why the registry process (running as user 1001) could not write to these directories. e.g.

sh-4.2$ cd /registry/docker/registry/v2/
sh-4.2$ ls -al
total 0
drwxrwsr-x.  4 1000000000 1000000000  39 Apr 20 15:51 .
drwxrwsr-x.  3 1000000000 1000000000  16 Apr 20 15:51 ..
drwxrwsr-x.  3 1000000000 1000000000  20 Apr 20 15:51 blobs
drwxrwsr-x. 15 1000000000 1000000000 215 May 29 14:14 repositories

Doing a `docker -exec -u 0 <registry-pod> on the infra node and then a `chown -R 1001.0 /registry/docker/registry`  to reset the permissions fixed the problem.

Anyone any idea what's going on here?


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