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I am dealing with a mystery either caused by <bad memory> or a complete system shutdown and restart....
Here is the issue. I have relocated my IBM i to a new co-lo which meant it was shut down, traveled across state lines and came up just fine about 5 days later. It took a while to get all of the firewall and access established and although the websites hosted on the i are running, my WordPress sites threw database errors a la "Error establishing a database connection". I had been starting mariadb from SSH with this command: /QOpenSys/usr/bin/sh /usr/local/mariadb/bin/mysql.sh start Which runs just fine. Except that didn't solve the connection error. So, from SSH I attempted to log in to Mariadb directly and get "ERROR 2002 (HY000): Can't connect to local server through socket '/QOpenSys/var/lib/mysql/mysql.sock' (2)" which is very weird since my SQL tool, Navicat, CAN open the databases and they appear to be up to date.
So, I checked the DB connections in the WordPress instances and noted that they were connecting though port 3307. Navicat was connecting though port 3306. Starting MariaDB with the command above, I see this in the logs:
2025-05-13 20:53:14 1 [Note] /usr/local/mariadb/bin/mysqld: ready for connections.
Version: '10.1.21-MariaDB' socket: '/usr/local/mariadbdata/mariadb.sock' port: 3306 Source distribution
So it seems like all is well, except the port doesn't match what is configured in the WP instances. It *should* be 3307 and I know I didn't change it. So I headed over to "Open Source Package Management" to check to see what was installed. Package manager says 10.6.12-3 is installed, which doesn't match what I see in the logs. Taking a look at the installed files for the package, I see a /QOpenSys/var/lib/mariadb/data folder and in that folder are the folders containing my DB files.
So, finally, the question: Since I only recall using the mysql start command above, how was the "other" instance of MariaDB running and how do I find out how to start it? I remember upgrading MariaDB but I don't recall running any command to start that instance, but I have slept many nights since that upgrade....
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