digital OCean ubuntu error

[matthew6688]

TASK [wordpress : Provision WP Database] ***************************************
fatal: [ifengshuo.com]: FAILED! => {"changed": false, "failed": true, "msg": "unable to find /root/.my.cnf. Exception message: (2002, "Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)")"}

I have tries so many times, the same mistakes above

[matthew6688]

still the same problem, looks stuck at:

TASK [percona : Install Percona server] ****************************************

for very long very long time