Comment 1 for bug 1251747

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Daniel Nichter (daniel-nichter) wrote :

Correction: it doesn't always default to /var/lib/mysql/mysql.sock, it defaults to mysqlclientlib default which DBI/DBD-mysql use because it (pt-agent) uses host=localhost which results in preferential use of the socket (vs. host=127.0.0.1 results in use of a TCP connection). If socket var for MySQL is different than the mysqlclientlib default, then using host=localhost causes the mismatch.

See also https://bugs.launchpad.net/percona-toolkit/+bug/1248363.