Hello @linh,
From the snapshot's configuration the bnsupport tool captured, both the php-fpm and mysql services are not running. Try restarting both services running the following commands:
$ sudo /opt/bitnami/ctlscript.sh start mysql
$ sudo /opt/bitnami/ctlscript.sh start php-fpm
If the problem persists, please share with us the contents of the database's log present at /opt/bitnami/mysql/logs/mysqld.log