Re: Redis db permission issue while running GitLab in Kubernetes with Gluster

John Strunk <jstrunk@xxxxxxxxxx> · Thu, 7 Sep 2017 15:28:50 -0400

I don't think this is a gluster problem...

Each container is going to have its own notion of user ids, hence the mystery uid 1000 in the redis container. I suspect that if you exec into the gitlab container, it may be the one running as 1000 (guessing based on the file names). If you want to share volumes across containers, you're going to have to do something explicitly to make sure each of them (with their own uid/gid) can read/write the volume, for example by sharing the same gid across all containers.
I'm going to suggest not sharing the same volume across all 3 containers unless they need shared access to the data.

-John

On Thu, Sep 7, 2017 at 12:13 PM, Gaurav Chhabra <varuag.chhabra@xxxxxxxxx> wrote:
Hello,

I am trying to setup GitLab, Redis and PostgreSQL containers in Kubernetes using Gluster for persistence. GlusterFS nodes are setup on machines (CentOS) external to Kubernetes cluster (running on RancherOS host). Issue is that when GitLab tries starting up, the login page doesn't load. It's a fresh setup and not something that stopped working now.
root@gitlab-2797053212-ph4j8:/var/log/gitlab/gitlab# tail -50 sidekiq.log
...
2017-09-07T11:53:03.099Z 547 TID-1fdf1k ERROR: Error fetching job: ERR Error running script (call to f_7b91ed9f4cba40689cea7172d1fd3e08b2efd8c9): @user_script:7: @user_script: 7: -MISCONF Redis is configured to save RDB snapshots, but is currently not able to persist on disk. Commands that may modify the data set are disabled. Please check Redis logs for details about the error.
2017-09-07T11:53:03.100Z 547 TID-1fdf1k ERROR: /home/git/gitlab/vendor/bundle/ruby/2.3.0/gems/redis-3.3.3/lib/redis/client.rb:121:in `call'
2017-09-07T11:53:03.100Z 547 TID-1fdf1k ERROR: /home/git/gitlab/vendor/bundle/ruby/2.3.0/gems/peek-redis-1.2.0/lib/peek/views/redis.rb:9:in `call'
2017-09-07T11:53:03.100Z 547 TID-1fdf1k ERROR: /home/git/gitlab/vendor/bundle/ruby/2.3.0/gems/redis-3.3.3/lib/redis.rb:2399:in `block in _eval'
2017-09-07T11:53:03.100Z 547 TID-1fdf1k ERROR: /home/git/gitlab/vendor/bundle/ruby/2.3.0/gems/redis-3.3.3/lib/redis.rb:58:in `block in synchronize'
2017-09-07T11:53:03.100Z 547 TID-1fdf1k ERROR: /usr/lib/ruby/2.3.0/monitor.rb:214:in `mon_synchronize'
2017-09-07T11:53:03.100Z 547 TID-1fdf1k ERROR: /home/git/gitlab/vendor/bundle/ruby/2.3.0/gems/redis-3.3.3/lib/redis.rb:58:in `synchronize'
...
So i checked for Redis container logs.
[root@node-a ~]# docker logs -f 67d44f585705
...
...
[1] 07 Sep 14:43:48.140 # Background saving error
[1] 07 Sep 14:43:54.048 * 1 changes in 900 seconds. Saving...
[1] 07 Sep 14:43:54.048 * Background saving started by pid 2437
[2437] 07 Sep 14:43:54.053 # Failed opening .rdb for saving: Permission denied
...
Checked online for this issue and then noticed the following permissions and owner details insideof Redis pod:
[root@node-a ~]# docker exec -it 67d44f585705 bash
groups: cannot find name for group ID 2000
root@redis-2138096053-0mlx4:/# ls -ld /var/lib/redis/
drwxr-sr-x 12 1000 1000 8192 Sep  7 11:51 /var/lib/redis/
root@redis-2138096053-0mlx4:/#
root@redis-2138096053-0mlx4:/# ls -l /var/lib/redis/
total 22
drwxr-sr-x 2  1000  1000     6 Sep  6 10:37 backups
drwxr-sr-x 2  1000  1000     6 Sep  6 10:37 builds
drwxr-sr-x 2 redis redis     6 Sep  6 10:14 data
-rw-r--r-- 1 redis redis 13050 Sep  7 11:51 dump.rdb
-rwxr-xr-x 1 redis redis    21 Sep  5 11:00 index.html
drwxrws--- 2  1000  1000     6 Sep  6 10:37 repositories
drwxr-sr-x 5  1000  1000    55 Sep  6 10:37 shared
drwxr-sr-x 2 root  root   8192 Sep  6 10:37 ssh
drwxr-sr-x 3 redis redis    70 Sep  7 10:20 tmp
drwx--S--- 2  1000  1000     6 Sep  6 10:37 uploads
root@redis-2138096053-0mlx4:/#
root@redis-2138096053-0mlx4:/# grep 1000 /etc/passwd
root@redis-2138096053-0mlx4:/#
Ran following and all looked fine.
root@redis-2138096053-0mlx4:/# chown redis:redis -R /var/lib/redis/
However, when i deleted and ran the GitLab deployment YAML again, the permissions inside the Redis container again got skewed up. I am not sure whether Gluster is messing up with the Redis file/folders permissions but i can't think of any other reason 
except for mount.
One thing i would like to highlight is that all the three containers are using the same PVC
- name: gluster-vol1
  persistentVolumeClaim:
    claimName: gluster-dyn-pvc
Above is common for all three. What differs is shown below:
a) postgresql-deployment.yaml

volumeMounts:
- name: gluster-vol1
  mountPath: /var/lib/postgresql

b) redisio-deployment.yaml

volumeMounts:
- name: gluster-vol1
  mountPath: /var/lib/redis

c) gitlab-deployment.yaml

volumeMounts:
- name: gluster-vol1
  mountPath: /home/git/data
Any suggestion? Also, i
 guess this is not 
the right way to use the same PVC/Storage Class for all three containers because i just noticed that all contents reside in the same dir inside Gluster nodes.
I know there are many things involved besides Gluster so this may not be _the_ right forum but amongst all, my gut feeling is that Gluster might be the reason for the permission issue.

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