[client]
user=root
password=rootPassword

INFO[0000] Starting mysqld_exporter (version=0.10.0, branch=master, revision=80680068f15474f87847c8ee8f18a2939a26196a)  source="mysqld_exporter.go:460"
INFO[0000] Build context (go=go1.8.1, user=root@3b0154cd9e8e, date=20170425-11:24:12)  source="mysqld_exporter.go:461"
ERRO[0000] Error pinging mysqld: dial tcp: address tcp/3306)(/var/run/mysqld/mysqld.sock: unknown port  source="mysqld_exporter.go:268"
INFO[0000] Listening on :9104                            source="mysqld_exporter.go:479"

vagrant@dev-default ~/ $ netstat -tupane | grep 3306
(No info could be read for "-p": geteuid()=1000 but you should be root.)
tcp        0      0 0.0.0.0:3306            0.0.0.0:*               LISTEN      110        9599        -