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Mattermost is a popular chat and collaboration tool, similar to Slack or Discord, but hosted on a server you control. Installing Mattermost on a Hostwinds Linux VPS or Dedicated server running CentOS 7 is a fairly straightforward process. Still, it does require extensive use of the command line for both Linux and MySQL. Start by connecting to your Linux VPS or Dedicated server over SSH.
The default version of MariaDB in CentOS 7 is equivalent to MySQL 5.5, and Mattermost requires 5.6 or higher. To install the latest MariaDB, we'll need to pull from the MariaDB site instead of the normal CentOS 7 repositories.
Step 1: Download and execute the 'mariadb repo setup' script from mariadb.org:
chmod +x mariadb_repo_setup
Step 2: Install and start MariaDB
yum -y install mysqltuner mariadb-server mariadb expect
systemctl enable mariadb
systemctl start mariadb
Step 3: Set the root password for MariaDB
ALTER USER 'root'@'localhost' IDENTIFIED BY 'ThisIsAPassword';
And you'll want to save this passsword into /root/.my.cnf for easier mysql command line access:
Step 1: Download Mattermost and extract it
You can find the latest Linux Server download for Mattermost on https://mattermost.com/download/ — 5.24.2 is the most recent at the time of writing and will be used.
Download the tarball
tar -zxvf mattermost*.gz
mv mattermost /opt
Step 2: Add the mattermost database
mysql -u root
> CREATE DATABASE mattermost;
> CREATE USER 'mmuser'@'localhost' IDENTIFIED BY "YourMatterMostDBPassword";
> GRANT ALL PRIVILEGES on mattermost.* TO 'mmuser'@'localhost';
> FLUSH PRIVILEGES;
Step 3: Add a user for Mattermost to run as
useradd --system --user-group mattermost
chown -R mattermost:mattermost /opt/mattermost
chmod -R g+w /opt/mattermost
Step 4: Edit the configuration file to match the database settings above.
The "SiteURL" value near the top should be changed to the hostname of your VPS or a domain pointing to it, e.g., "SiteURL": "http://hwsrv-12345.hostwindsdns.com"
The "DataSource" line (much further down in the file, use ctrl-w in nano to search) needs to be edited to have the mmuser database password set in step 2 and point to the right database name.
Note: the database name is set between the / and? Above, the default is mattermost_test, but the database created in step 2 is just 'mattermost,' so remove the _test in the config line
ctrl-x to exit nano, y to say yes to saving, then enter actually to exit.
Step 5: Start Mattermost
To run Mattermost as the mattermost user:
sudo -u mattermost ./bin/mattermost
It will take several seconds to start up the first time, as it populates the database, but you should be able to load http://:8065 in a browser to make sure it worked. From there, you can create your administrator account and start setting up channels, groups, etc.
Step 6: Turn Mattermost into a service that runs when the server starts
(ctrl-c to exit the running mattermost and return to the root command line)
and paste in (right-click in PuTTY)
After=syslog.target network.target mysqld.service
Then ctrl-x, y, and enter.
chmod 664 /etc/systemd/system/mattermost.service
systemctl enable mattermost
systemctl start mattermost
Assuming no errors come out of the systemctl start mattermost, you can (re) load the Mattermost webpage on your server at HTTP://\:8065
On the Mattermost webpage, you'll create the first account, and then you can jump right into chatting by creating a team or go to the System Console to change more options in Mattermost.
There are Help links on any Mattermost page that link to documentation, and please stop by our LiveChat if you have any questions.
Written by Evan Winter / July 3, 2020