The mysql service was stopped and in mysql log I saw these warning:
161125 16:41:10 [Warning] IP address 'x.x.x.x' has been resolved to the host name 'x.x.x.x.xxx.xxxxxx.com', which resembles IPv4-address itself. 161125 23:58:23 [Note] /usr/sbin/mysqld: Normal shutdown
with iptable, only the server address is accepted for port 3306
In my.cnf I set the bind_address = server_adress_ip: bind_address = x.x.x.x
Why the mysql service was stopped?