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Mattermost settings from gitlab.rb not written to config.json (but mattermost runs ok)

Summary

The settings for Mattermost which are configured in gitlab.rb are not written to the mattermost config file at /var/opt/gitlab/mattermost/config.json

Steps to reproduce

  • Change a setting for mattermost in gitlab.rb, fore example activate the sql driver and change it to postgres: mattermost['sql_driver_name'] = 'postgres'
  • Run gitlab-ctl reconfigure
  • Look at the SqlSettings block in /var/opt/gitlab/mattermost/config.json

What is the current bug behavior?

/var/opt/gitlab/mattermost/config.json shows:

    "SqlSettings": {
        "DriverName": "mysql",
        "DataSource": "mmuser:mostest@tcp(dockerhost:3306)/mattermost_test?charset=utf8mb4,utf8\u0026readTimeout=30s\u0026writeTimeout=30s",
        "DataSourceReplicas": [],
        "DataSourceSearchReplicas": [],
        "MaxIdleConns": 20,
        "ConnMaxLifetimeMilliseconds": 3600000,
        "MaxOpenConns": 300,
        "Trace": false,
        "AtRestEncryptKey": "sr93dw7qayn5ugu9mrjjifa9k1hz6hxb",
        "QueryTimeout": 30
    },

The generated config cannot be used with the mattermost cli:

$ sudo /opt/gitlab/embedded/bin/mattermost team add -c /var/opt/gitlab/mattermost/config.json test ***                                                  
{"level":"info","ts":1567610586.6984339,"caller":"utils/i18n.go:83","msg":"Loaded system translations for 'en' from '/opt/gitlab/embedded/service/mattermost/i18n/en.json'"}
{"level":"info","ts":1567610586.6988313,"caller":"app/server_app_adapters.go:58","msg":"Server is initializing..."}
{"level":"info","ts":1567610586.7019591,"caller":"sqlstore/supplier.go:224","msg":"Pinging SQL master database"}
{"level":"error","ts":1567610606.7050793,"caller":"sqlstore/supplier.go:236","msg":"Failed to ping DB retrying in 10 seconds err=dial tcp: lookup dockerhost on 10.128.20.45:53: server misbehaving"}

What is the expected correct behavior?

It should show something with postgres

Relevant logs

The strange thing is that mattermost runs ok and it uses the postgres db.

Relevant logs 
// /var/log/gitlab/mattermost/mattermost.log
{"level":"info","ts":1567555455.1633806,"caller":"app/server.go:214","msg":"Enterprise Enabled: false"}
{"level":"info","ts":1567555455.1633997,"caller":"app/server.go:216","msg":"Current working directory is /opt/gitlab/embedded/service/mattermost"}
{"level":"info","ts":1567555455.1634173,"caller":"app/server.go:217","msg":"Loaded config","source":"file:///var/opt/gitlab/mattermost/config.json"}

Details of package version

Provide the package version installation details 
ii  gitlab-ce                                       12.2.3-ce.0                  amd64                        GitLab Community Edition (including NGINX, Postgres, Redis)

Environment details

  • Operating System: Ubuntu 16.04 LTS
  • Installation Target, remove incorrect values:
    • Bare Metal Machine
  • Installation Type, remove incorrect values:
    • New Installation
  • Is there any other software running on the machine: system installed nginx
  • Is this a single or multiple node installation? single

Configuration details

Provide the relevant sections of `/etc/gitlab/gitlab.rb` 
mattermost['sql_driver_name'] = 'postgres'