Description:
Page: https://dev.mysql.com/doc/refman/5.7/en/mysqld-safe.html#option_mysqld_safe_mysqld
"--mysqld=prog_name
The name of the server program (in the ledir directory) that you want to start. This option is needed if you use the MySQL binary distribution but have the data directory outside of the binary distribution. If mysqld_safe cannot find the server, use the --ledir option to indicate the path name to the directory where the server is located.
As of MySQL 5.7.15, this option is accepted only on the command line, not in option files. On platforms that use systemd, the value can be specified in the value of MYSQLD_OPTS. See Section 2.5.10, “Managing MySQL Server with systemd”."
With systemd this can't be set in MYSQLD_OPTS, but specifying an alternative "ExecStart=" works with "journalctl edit mysqld"
This is stored in /etc/systemd/system/mysqld.service.d/override.conf
This is documented on https://dev.mysql.com/doc/refman/5.7/en/using-systemd.html
However https://dev.mysql.com/doc/refman/5.7/en/using-systemd.html doesn't mention mysqld-debug explicitly (I think it should).
I think it should also mention that mysqld-debug should use an alternative plugin_dir (See Bug #88088 )
How to repeat:
See description
