Optimize for low RAM server

http://www.narga.net/optimizing-apachephpmysql-low-memory-server/

mosquitto 1024 limit

https://answers.launchpad.net/mosquitto/+question/223788

Roger Light (roger.light) said on 2013-03-09:

#1

The system wide limit doesn't get applied because upstart sets the limits. Try editing /etc/init/mosquitto.conf and adding this line:

limit nofile 4096 4096