SQLSTATE[HY000]  Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock'
I have two droplets on Digitalocean with same configuration on UBUNTU platform. 1 is performing great, but facing DB issue in another one.
In every 2-3 months, MYSQL DB is getting down with error-
SQLSTATE[HY000]  Can’t connect to local MySQL server through socket ’/var/run/mysqld/mysqld.sock’
TO solve this issue I followed thread https://www.digitalocean.com/community/questions/magento-shows-error-sqlstate-hy000-2002-can-t-connect-to-local-mysql-server-through-socket-var-run-mysqld-mysqld-sock-13.
But again after some months same issue is happening again and again. Please guide me how to avoid from getting DB down?