Mattermost image uploads don't work
It seems like there is a permissions issue in the gitlab-data directory that's preventing Mattermost from creating a directory for storing user data, like images. Here's an excerpt from the logs.
[2017/01/26 07:13:36 UTC] [EROR] /api/v3/users/6swfeu61mj86tdbnzfipcachph/image:WriteFile code=500 rid=qky8wp3cntyzuqukxyfjcadpee uid=6swfeu61mj86tdbnzfipcachph ip=10.138.0.2 Encountered an error creating the directory for the new file [details: directory=/gitlab-data/mattermost/users/6swfeu61mj86tdbnzfipcachph, err=mkdir /gitlab-data/mattermost: permission denied]
[2017/01/26 07:13:36 UTC] [EROR] /api/v3/users/6swfeu61mj86tdbnzfipcachph/image:WriteFile code=500 rid=xds6whaidtdbir1fh9zb4bha1o uid=6swfeu61mj86tdbnzfipcachph ip=10.138.0.2 Encountered an error creating the directory for the new file [details: directory=/gitlab-data/mattermost/users/6swfeu61mj86tdbnzfipcachph, err=mkdir /gitlab-data/mattermost: permission denied]
[2017/01/26 07:15:11 UTC] [EROR] /api/v3/users/6swfeu61mj86tdbnzfipcachph/image:WriteFile code=500 rid=gnx83zs9xtf7iegzt3r31wtg8o uid=6swfeu61mj86tdbnzfipcachph ip=10.138.0.2 Encountered an error creating the directory for the new file [details: directory=/gitlab-data/mattermost/users/6swfeu61mj86tdbnzfipcachph, err=mkdir /gitlab-data/mattermost: permission denied]
[2017/01/26 07:15:18 UTC] [EROR] /api/v3/users/6swfeu61mj86tdbnzfipcachph/image:WriteFile code=500 rid=tbyw1rfhj78jpnt88g6aonrmfr uid=6swfeu61mj86tdbnzfipcachph ip=10.138.0.2 Encountered an error creating the directory for the new file [details: directory=/gitlab-data/mattermost/users/6swfeu61mj86tdbnzfipcachph, err=mkdir /gitlab-data/mattermost: permission denied]
[2017/01/26 07:15:20 UTC] [EROR] /api/v3/users/6swfeu61mj86tdbnzfipcachph/image:WriteFile code=500 rid=7j3u649mj3ndx8q38oh83o1dsw uid=6swfeu61mj86tdbnzfipcachph ip=10.138.0.2 Encountered an error creating the directory for the new file [details: directory=/gitlab-data/mattermost/users/6swfeu61mj86tdbnzfipcachph, err=mkdir /gitlab-data/mattermost: permission denied]
[2017/01/26 07:15:30 UTC] [EROR] /api/v3/users/6swfeu61mj86tdbnzfipcachph/image:WriteFile code=500 rid=yidk5697ubnwjpsk71w4mj5q8o uid=6swfeu61mj86tdbnzfipcachph ip=10.138.0.2 Encountered an error creating the directory for the new file [details: directory=/gitlab-data/mattermost/users/6swfeu61mj86tdbnzfipcachph, err=mkdir /gitlab-data/mattermost: permission denied]
[2017/01/26 07:15:52 UTC] [EROR] /api/v3/users/newimage:uploadProfileImage code=500 rid=j9444tncy3y6ufymry48dn8deh uid=6swfeu61mj86tdbnzfipcachph ip=10.138.0.2 Couldn't upload profile image [details: ]
[2017/01/26 07:15:52 UTC] [EROR] /api/v3/users/6swfeu61mj86tdbnzfipcachph/image:WriteFile code=500 rid=8w4b4q59spb5fjc1rnmwopf8ty uid=6swfeu61mj86tdbnzfipcachph ip=10.138.0.2 Encountered an error creating the directory for the new file [details: directory=/gitlab-data/mattermost/users/6swfeu61mj86tdbnzfipcachph, err=mkdir /gitlab-data/mattermost: permission denied]
[2017/01/26 07:16:51 UTC] [EROR] /api/v3/users/6swfeu61mj86tdbnzfipcachph/image:WriteFile code=500 rid=fkf47615wpra7ge6jj9rp9f48o uid=6swfeu61mj86tdbnzfipcachph ip=10.16.0.1 Encountered an error creating the directory for the new file [details: directory=/gitlab-data/mattermost/users/6swfeu61mj86tdbnzfipcachph, err=mkdir /gitlab-data/mattermost: permission denied]
[2017/01/26 07:17:10 UTC] [EROR] /api/v3/users/6swfeu61mj86tdbnzfipcachph/image:WriteFile code=500 rid=d6ap66xyntra9driufxy5bnyuo uid=6swfeu61mj86tdbnzfipcachph ip=10.16.0.1 Encountered an error creating the directory for the new file [details: directory=/gitlab-data/mattermost/users/6swfeu61mj86tdbnzfipcachph, err=mkdir /gitlab-data/mattermost: permission denied]
[2017/01/26 07:17:21 UTC] [EROR] /api/v3/users/6swfeu61mj86tdbnzfipcachph/image:WriteFile code=500 rid=em6cgtu4ii8xdewobaettijh7h uid=6swfeu61mj86tdbnzfipcachph ip=10.16.0.1 Encountered an error creating the directory for the new file [details: directory=/gitlab-data/mattermost/users/6swfeu61mj86tdbnzfipcachph, err=mkdir /gitlab-data/mattermost: permission denied]
[2017/01/26 07:17:27 UTC] [EROR] /api/v3/users/newimage:uploadProfileImage code=500 rid=kmfubbf73fg498twm8j61e4x7r uid=6swfeu61mj86tdbnzfipcachph ip=10.16.0.1 Couldn't upload profile image [details: ]
[2017/01/26 07:17:27 UTC] [EROR] /api/v3/users/6swfeu61mj86tdbnzfipcachph/image:WriteFile code=500 rid=a3k3y5mfxtdziprc7uudzu41ho uid=6swfeu61mj86tdbnzfipcachph ip=10.16.0.1 Encountered an error creating the directory for the new file [details: directory=/gitlab-data/mattermost/users/6swfeu61mj86tdbnzfipcachph, err=mkdir /gitlab-data/mattermost: permission denied]
[2017/01/26 07:17:50 UTC] [EROR] /api/v3/users/newimage:uploadProfileImage code=500 rid=p7d41rwebt8c7pw7hu7cyiqi4r uid=6swfeu61mj86tdbnzfipcachph ip=10.16.0.1 Couldn't upload profile image [details: ]
[2017/01/26 07:17:50 UTC] [EROR] /api/v3/users/6swfeu61mj86tdbnzfipcachph/image:WriteFile code=500 rid=z3h5shf74brwurkcjj8uimxnqh uid=6swfeu61mj86tdbnzfipcachph ip=10.16.0.1 Encountered an error creating the directory for the new file [details: directory=/gitlab-data/mattermost/users/6swfeu61mj86tdbnzfipcachph, err=mkdir /gitlab-data/mattermost: permission denied]