运行 GitLab 时的 Redis 数据库权限问题

Question

我正在尝试使用 Gluster 在 Kubernetes 中设置 GitLab、Redis 和 PostgreSQL 容器以实现持久性。 GlusterFS 节点设置在 Kubernetes 集群外部的机器 (CentOS) 上(在 RancherOS 主机上运行)。问题是当 GitLab 尝试启动时，登录页面不会加载。这是一个全新的设置，而不是现在停止工作的东西。

root@gitlab-2797053212-ph4j8:/var/log/gitlab/gitlab# tail -50 sidekiq.log
...
...
   2017-09-07T11:53:03.098Z 547 TID-1fdjck ERROR: /home/git/gitlab/vendor/bundle/ruby/2.3.0/gems/sidekiq-5.0.0/lib/sidekiq/processor.rb:84:in `process_one'
2017-09-07T11:53:03.098Z 547 TID-1fdjck ERROR: /home/git/gitlab/vendor/bundle/ruby/2.3.0/gems/sidekiq-5.0.0/lib/sidekiq/processor.rb:73:in `run'
2017-09-07T11:53:03.098Z 547 TID-1fdjck ERROR: /home/git/gitlab/vendor/bundle/ruby/2.3.0/gems/sidekiq-5.0.0/lib/sidekiq/util.rb:17:in `watchdog'
2017-09-07T11:53:03.098Z 547 TID-1fdjck ERROR: /home/git/gitlab/vendor/bundle/ruby/2.3.0/gems/sidekiq-5.0.0/lib/sidekiq/util.rb:26:in `block in safe_thread'
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'
...

所以我检查了 Redis 容器日志。

[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
...

在线检查此问题，然后注意到 Redis pod 内部的以下权限和所有者详细信息:

[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:/#

跟着跑，一切看起来都很好。

root@redis-2138096053-0mlx4:/# chown redis:redis -R /var/lib/redis/

但是，当我再次删除并运行 GitLab 部署 YAML 时，Redis 容器内的权限再次发生了偏差。我不确定 Gluster 是否搞乱了 Redis 文件/文件夹权限。目前想不出任何其他原因。

我想强调的是所有三个容器都使用相同 PVC

- name: gluster-vol1
  persistentVolumeClaim:
    claimName: gluster-dyn-pvc

以上三者通用。不同之处如下所示:

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

有什么建议吗？

Answer 1

通过以下步骤，我能够解决 Redis 的“权限被拒绝”问题:

1. 在 GlusterFS 中为 PostegreSQL、Redis 和 GitLab 创建了单独的卷。
2. 为所有三个创建了单独的存储类。
3. 为它们创建了 PersistentVolumeClaim (PVC) 并映射了 /var/lib/postgresql、/var/lib/redis 和 /home/git/data 到他们各自的 PVC。

早些时候，上面提到的所有三个路径都指向 GlusterFS 中的同一个卷。不知何故，它们似乎给 Redis 带来了问题。