resonable resource limits for production EC2 instances

Typically, you may want to tune your production ec2 instance's resource limits because the defaults are fairly low for any practical purposes:

• In your /etc/security/limits.conf, you can set the hard limit and soft limit for no. of file descriptors and max user processes. NOTE - If you set max process value in etc/security/limits.d/90-nproc.conf, it will override the value in limits.conf. Also, you must reboot your instances in both cases.

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*                     hard    nofile          65535

*                     soft     nofile          65535

@<user>        hard   nproc          16384

@<user>        soft    nproc          4096

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• If you have multiple user processes running, then you may want to set "kernel.max_pid" parameter in /etc/sysctl.conf

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#Allow for more PIDs

kernel.pid_max = 65536

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