Readiness/liveness probe for MySQL

It is useful when running MySQL in container. Suppose that we have the following env variables:

MYSQL_USER='db_usr'
MYSQL_PASSWORD='db_pwd'

So, you can use the following as readiness/liveness probe:

/bin/sh -c -i "MYSQL_PWD=\"$MYSQL_PASSWORD\" mysqladmin -u $MYSQL_USER ping"