kvm-tweaks.sh

#!/bin/bash

sudo su

ulimit -n 99999

echo '*         hard    nofile      500000' >> /etc/security/limits.conf
echo '*         soft    nofile      500000' >> /etc/security/limits.conf
echo 'root      hard    nofile      500000' >> /etc/security/limits.conf
echo 'root      soft    nofile      500000' >> /etc/security/limits.conf

echo 0 > /sys/block/vda/queue/rotational
echo 0 > /sys/block/vda/queue/rq_affinity
echo noop > /sys/block/vda/queue/scheduler
echo "echo 0 > /sys/block/vda/queue/rotational" >> /etc/rc.local
echo "echo 0 > /sys/block/vda/queue/rq_affinity" >> /etc/rc.local
echo "echo noop > /sys/block/vda/queue/scheduler" >> /etc/rc.local
echo 'vm.swappiness=5' >> /etc/sysctl.conf
echo 'vm.vfs_cache_pressure=50' >> /etc/sysctl.conf
echo 'net.core.rmem_max=16777216' >> /etc/sysctl.conf
echo 'net.core.wmem_max=16777216' >> /etc/sysctl.conf
echo 'net.ipv4.tcp_rmem=4096 87380 16777216' >> /etc/sysctl.conf
echo 'net.ipv4.tcp_wmem=4096 65536 16777216' >> /etc/sysctl.conf
echo 'fs.file-max=100000' >> /etc/sysctl.conf

sysctl -p