Document socket-based access

[kasimon]

If mysqld_exporter runs on the same system as the database, socket based authentication removes the need to manage a password.

Signed-off-by: Karsten Heymann karsten.heymann@gmail.com

[SuperQ]

Thanks, but we need to update this to use the new config file format or command line flag (--mysqld.address=).

[cf-sewe]

How would the new format look like?

i tried both, but it doesn't seem to work:

--mysqld.address="unix(/var/run/mariadb/mysql.sock)"

2023-07-05T16:16:30.833935+02:00 db mariadb_exporter[3181430]: ts=2023-07-05T14:16:30.832Z caller=mysqld_exporter.go:225 level=info msg="Error parsing host config" file=.my.cnf err="failed to parse address: address unix(/var/run/mariadb/mysql.sock): missing port in address"

--mysqld.address="unix:///var/run/mariadb/mysql.sock"

2023-07-05T16:17:31.077223+02:00 db mariadb_exporter[3181808]: ts=2023-07-05T14:17:31.075Z caller=config.go:146 level=error msg="failed to parse config" section=client err="set field \"port\": strconv.ParseInt: parsing \"///var/run/mariadb/mysql.sock\": invalid syntax"