Puppet Class: base::mysterious_sysctl

Defined in:
modules/base/manifests/mysterious_sysctl.pp

Overview

These are orphaned sysctls from the webserver::sysctl_settings Ancient and mysterious, these can either have absolutely no effect on modern kernels or could be the very things that keeps the fabric of the space time continuum (and our wikis) alive. We do not know, though. So move it here so we can kill the webservermodule, and then figure out what to do with these



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# File 'modules/base/manifests/mysterious_sysctl.pp', line 7

class base::mysterious_sysctl {
    # Sysctl settings for high-load HTTP caches
    sysctl::parameters { 'high http performance':
        values => {
            # Increase the number of ephemeral ports
            'net.ipv4.ip_local_port_range' =>  [ 1024, 65535 ],

            # Recommended to increase this for 1000 BT or higher
            'net.core.netdev_max_backlog'  =>  30000,

            # Increase the queue size of new TCP connections
            'net.core.somaxconn'           => 4096,
            'net.ipv4.tcp_max_syn_backlog' => 262144,
            'net.ipv4.tcp_max_tw_buckets'  => 360000,

            # Decrease FD usage
            'net.ipv4.tcp_fin_timeout'     => 3,
            'net.ipv4.tcp_max_orphans'     => 262144,
            'net.ipv4.tcp_synack_retries'  => 2,
            'net.ipv4.tcp_syn_retries'     => 2,
        },
    }

}