Install and set up the database for use by the Mattermost server. You can install either MySQL or PostgreSQL.
To install MySQL on RHEL 8
Log in to the server that will host the database, and open a terminal window.
If you have additional questions about the process reference the MySQL docs here that matches your system. If your RHEL is a fresh install, you’ll need to add the MySQL Yum repository. You can also use the MySQL repo - https://repo.mysql.com/.
Download the latest release package using wget:
Once downloaded, install it:
sudo yum localinstall platform-and-version-specific-package-name.rpm. This will be the rpm package you installed in step 2. Now run a
sudo yum update, this could take some time.
Next disable the system MySQL:
sudo yum module disable mysql
and then install MySQL.
sudo yum install mysql-community-server
Start the MySQL server.
sudo systemctl start mysqld.service
The first time that you start MySQL, the superuser account
'root'@'localhost' is created with a password. Run the command below to get this password.
sudo grep 'temporary password' /var/log/mysqld.log. Also the first time that you start MySQL, the
validate_password plugin is installed. The plugin forces passwords to contain at least one upper case letter, one lower case letter, one digit, and one special character, and that the total password length is at least 8 characters.
Change the root password. Log in with the the command below. Use the password found in
sudo grep 'temporary password' /var/log/mysqld.log.
mysql -u root -p
Change the password. At the prompt, type the following command. Be sure to replace
Password42!with the password that you want to use:
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'Password42!';
Set MySQL to start automatically when the machine starts.
sudo systemctl enable mysqld
Create the Mattermost user mmuser.
mysql> create user 'mmuser'@'%' identified by 'mmuser-password';
Use a password that’s more secure than mmuser-password.
The ‘%’ means that mmuser can connect from any machine on the network. However, it’s more secure to use the IP address of the machine that hosts Mattermost. For example, if you install Mattermost on the machine with IP address 10.10.10.2, then use the following command:
mysql> create user 'mmuser'@'10.10.10.2' identified by 'mmuser-password';
Create the Mattermost database.
mysql> create database mattermost;
Grant access privileges to the user mmuser.
mysql> grant all privileges on mattermost.* to 'mmuser'@'%';
This query grants the MySQL user we just created all privileges on the database for convenience. If you need more security you can use this query to grant the user only the privileges necessary to run Mattermost.
mysql> GRANT ALTER, CREATE, DELETE, DROP, INDEX, INSERT, SELECT, UPDATE, REFERENCES ON mattermost.* TO 'mmuser'@'%';
Log out of MySQL.
With the database installed and the initial setup complete, you can now install the Mattermost server.