root@template:/# service mysql status
● mysql.service - MySQL Community Server
   Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)
   Active: active (running) since Mon 2020-04-20 15:50:54 CEST; 38min ago
     Docs: man:mysqld(8)
           http://dev.mysql.com/doc/refman/en/using-systemd.html
 Main PID: 2550 (mysqld)
   Status: "Server is operational"
    Tasks: 46 (limit: 4700)
   Memory: 478.1M
   CGroup: /system.slice/mysql.service
           └─2550 /usr/sbin/mysqld

Apr 20 15:50:51 template systemd[1]: Starting MySQL Community Server...
Apr 20 15:50:54 template systemd[1]: Started MySQL Community Server.
root@template:/# service mysql restart
root@template:/# sudo service mattermost start
Job for mattermost.service failed because the control process exited with error code.
See "systemctl status mattermost.service" and "journalctl -xe" for details.
root@template:/# journalctl -xe
Apr 20 16:31:38 template qemu-ga[320]: info: guest-ping called
Apr 20 16:31:46 template systemd[1]: mattermost.service: Service RestartSec=10s expired, scheduling restart.
Apr 20 16:31:46 template systemd[1]: mattermost.service: Scheduled restart job, restart counter is at 17.
-- Subject: Automatic restarting of a unit has been scheduled
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- Automatic restarting of the unit mattermost.service has been scheduled, as the result for
-- the configured Restart= setting for the unit.
Apr 20 16:31:46 template systemd[1]: Stopped Mattermost.
-- Subject: A stop job for unit mattermost.service has finished
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- A stop job for unit mattermost.service has finished.
--
-- The job identifier is 2635 and the job result is done.
Apr 20 16:31:46 template systemd[1]: Starting Mattermost...
-- Subject: A start job for unit mattermost.service has begun execution
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- A start job for unit mattermost.service has begun execution.
--
-- The job identifier is 2635.
Apr 20 16:31:46 template mattermost[3923]: Error: failed to load configuration: failed to load: invalid config: Config.IsValid: model.config.is_valid.tls_cert_file.app_error,
Apr 20 16:31:46 template mattermost[3923]: Usage:
Apr 20 16:31:46 template mattermost[3923]:   mattermost [flags]
Apr 20 16:31:46 template mattermost[3923]:   mattermost [command]
Apr 20 16:31:46 template mattermost[3923]: Available Commands:
Apr 20 16:31:46 template mattermost[3923]:   channel     Management of channels
Apr 20 16:31:46 template mattermost[3923]:   command     Management of slash commands
Apr 20 16:31:46 template mattermost[3923]:   config      Configuration
Apr 20 16:31:46 template mattermost[3923]:   export      Export data from Mattermost
Apr 20 16:31:46 template mattermost[3923]:   group       Management of groups
Apr 20 16:31:46 template mattermost[3923]:   help        Help about any command
Apr 20 16:31:46 template mattermost[3923]:   import      Import data.
Apr 20 16:31:46 template mattermost[3923]:   integrity   Check database data integrity
Apr 20 16:31:46 template mattermost[3923]:   jobserver   Start the Mattermost job server
Apr 20 16:31:46 template mattermost[3923]:   ldap        LDAP related utilities
Apr 20 16:31:46 template mattermost[3923]:   license     Licensing commands
Apr 20 16:31:46 template mattermost[3923]:   logs        Display logs in a human-readable format
Apr 20 16:31:46 template mattermost[3923]:   permissions Management of the Permissions system
Apr 20 16:31:46 template mattermost[3923]:   plugin      Management of plugins
Apr 20 16:31:46 template mattermost[3923]:   reset       Reset the database to initial state
Apr 20 16:31:46 template mattermost[3923]:   roles       Management of user roles
Apr 20 16:31:46 template mattermost[3923]:   sampledata  Generate sample data
Apr 20 16:31:46 template mattermost[3923]:   server      Run the Mattermost server
Apr 20 16:31:46 template mattermost[3923]:   team        Management of teams
Apr 20 16:31:46 template mattermost[3923]:   user        Management of users
Apr 20 16:31:46 template mattermost[3923]:   version     Display version information
Apr 20 16:31:46 template mattermost[3923]:   webhook     Management of webhooks
Apr 20 16:31:46 template mattermost[3923]: Flags:
Apr 20 16:31:46 template mattermost[3923]:   -c, --config string        Configuration file to use. (default "config.json")
Apr 20 16:31:46 template mattermost[3923]:       --disableconfigwatch   When set config.json will not be loaded from disk when the file is changed.
Apr 20 16:31:46 template mattermost[3923]:   -h, --help                 help for mattermost
Apr 20 16:31:46 template mattermost[3923]: Use "mattermost [command] --help" for more information about a command.
Apr 20 16:31:46 template systemd[1]: mattermost.service: Main process exited, code=exited, status=1/FAILURE
-- Subject: Unit process exited
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- An ExecStart= process belonging to unit mattermost.service has exited.
--
-- The process' exit code is 'exited' and its exit status is 1.
Apr 20 16:31:46 template systemd[1]: mattermost.service: Failed with result 'exit-code'.
-- Subject: Unit failed
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- The unit mattermost.service has entered the 'failed' state with result 'exit-code'.
Apr 20 16:31:46 template systemd[1]: Failed to start Mattermost.
-- Subject: A start job for unit mattermost.service has failed
-- Defined-By: systemd
-- Support: https://www.debian.org/support
--
-- A start job for unit mattermost.service has finished with a failure.
--
-- The job identifier is 2635 and the job result is failed.
Apr 20 16:31:49 template qemu-ga[320]: info: guest-ping called