Mattermost is an enterprise grade, instant messaging platform, an open-source self-hosted Slack alternative. It’s written in Golang and React and can use MySQL or PostgreSQL as a database backend. Mattermost brings all your team communication into one place and provides various features including file sharing, one-on-one and group messaging, custom emojis, video calls and more.
This error was because the sql settings (the username and password) created for the the PostgresSQL database were not present (configured correctly). See how to install Mattermost on Ubuntu 20.04, 18.04 and Debian 10. As we can see, using both the “systemctl status mattermost.service” and “journalctl -xe” coud not provide me enough information. I had to dig dip.
Solution: Ensure the right Postgres parameters (username and password) are entered here or else, the services will never start.
"DataSource": "postgres://tester:What@Mattermost@localhost:5432/mattermost?sslmode=disable&connect_timeout=10",
Now let us try to start the service again, this should start correctly.
I hope you found this blog post helpful. If you have any questions, please let me know in the comment session.