hi,
As several topics my issue is same
I am new to NGINX EE nd every thing 
I setup my WP site and migrated it to nginx
I have been receiving too much DB connection error
I ran df -h
it told drive 100% full/dev/xvda1 7.8G 7.4G 0 100% /
I restarted ee stack restart
it told mysql failed to restart
I checked logs that consumming my storages
Tell me what should I do to cycle logs or delete them secuarly and how to eleminate these troubles completely in future