Troubleshooing selinux denials

First find out the denial message:

 sealert -b  

or:

 sealert -a /var/log/audit/audit.log > /path/to/mylogfile.txt   

or:
check audit log file: /var/log/audit/audit.log

After the problem is found, depending on the nature of the problem, these solutions are possible:
Access is denied to a file:

 semanage port -a -t <context_type> -p tcp <port>

Access is denied to a port:

 chcon -Rv --type=<content_type> <path>  

Where the context can be one of the selinux context types like http_port_t or httpd_sys_content_t

Backup and Restore Gitlab (omnibus only)

To backup gitlab files:

 gitlab-rake gitlab:backup:create  

The backup will be placed in: /var/opt/gitlab/backups

To restore the backup, one can use these commands:

 gitlab-ctl stop unicorn  
 gitlab-ctl stop sidekiq  
 gitlab-rake gitlab:backup:restore BACKUP=<timestamp>  
 gitlab-ctl start  
 gitlab-rake gitlab:check SANITIZE=true