Cassandra recommended limits per academy course configuring-kernel

bash-add.sh

#!/bin/bash

echo '*  soft    as       unlimited' | sudo tee --append /etc/security/limits.conf
echo '*  hard    as       unlimited' | sudo tee --append /etc/security/limits.conf
echo '*  soft    cpu       unlimited' | sudo tee --append /etc/security/limits.conf
echo '*  hard    cpu       unlimited' | sudo tee --append /etc/security/limits.conf
echo '*  soft    data     unlimited' | sudo tee --append /etc/security/limits.conf
echo '*  hard    data     unlimited' | sudo tee --append /etc/security/limits.conf
echo '*  soft    fsize     unlimited' | sudo tee --append /etc/security/limits.conf
echo '*  hard    fsize     unlimited' | sudo tee --append /etc/security/limits.conf
echo '*  soft    locks       unlimited' | sudo tee --append /etc/security/limits.conf
echo '*  hard    locks       unlimited' | sudo tee --append /etc/security/limits.conf
echo '*  soft    memlock     unlimited' | sudo tee --append /etc/security/limits.conf
echo '*  hard    memlock     unlimited' | sudo tee --append /etc/security/limits.conf
echo '*  soft    msgqueue       unlimited' | sudo tee --append /etc/security/limits.conf
echo '*  hard    msgqueue       unlimited' | sudo tee --append /etc/security/limits.conf
echo '*  hard    nofile      1048576' | sudo tee --append /etc/security/limits.conf
echo '*  soft    nofile      1048576' | sudo tee --append /etc/security/limits.conf
echo '*  soft    nproc       unlimited' | sudo tee --append /etc/security/limits.conf
echo '*  hard    nproc       unlimited' | sudo tee --append /etc/security/limits.conf
echo '*  soft    rss       unlimited' | sudo tee --append /etc/security/limits.conf
echo '*  hard    rss       unlimited' | sudo tee --append /etc/security/limits.conf
echo '*  soft    sigpending       unlimited' | sudo tee --append /etc/security/limits.conf
echo '*  hard    sigpending       unlimited' | sudo tee --append /etc/security/limits.conf
echo '*  soft    stack       unlimited' | sudo tee --append /etc/security/limits.conf
echo '*  hard    stack       unlimited' | sudo tee --append /etc/security/limits.conf
echo 'fs.file-max = 1048576' | sudo tee --append /etc/sysctl.conf
echo 'kernel.sysrq = 1' | sudo tee --append /etc/sysctl.conf
echo 'kernel.panic = 300' | sudo tee --append /etc/sysctl.conf
echo 'kernel.pid_max = 999999' | sudo tee --append /etc/sysctl.conf
echo 'net.ipv4.ip_forward=0' | sudo tee --append /etc/sysctl.conf
echo 'net.ipv4.tcp_rmem = 4096 65536 16777216' | sudo tee --append /etc/sysctl.conf
echo 'net.ipv4.tcp_tw_reuse = 1' | sudo tee --append /etc/sysctl.conf
echo 'net.ipv4.tcp_wmem = 4096 65536 16777216' | sudo tee --append /etc/sysctl.conf
echo 'net.ipv6.conf.all.forwarding=0' | sudo tee --append /etc/sysctl.conf
echo 'net.core.rmem_max = 16777216' | sudo tee --append /etc/sysctl.conf
echo 'net.core.wmem_max = 16777216' | sudo tee --append /etc/sysctl.conf
echo 'vm.max_map_count = 1048576' | sudo tee --append /etc/sysctl.conf
echo 'vm.overcommit_memory = 1' | sudo tee --append /etc/sysctl.conf
echo 'vm.zone_reclaim_mode = 0' | sudo tee --append /etc/sysctl.conf

sysctl -p

limits.conf

# /etc/security/limits.conf
*  soft    as       unlimited
*  hard    as       unlimited
*  soft    cpu       unlimited
*  hard    cpu       unlimited
*  soft    data     unlimited
*  hard    data     unlimited
*  soft    fsize     unlimited
*  hard    fsize     unlimited
*  soft    locks       unlimited
*  hard    locks       unlimited
*  soft    memlock     unlimited
*  hard    memlock     unlimited
*  soft    msgqueue       unlimited
*  hard    msgqueue       unlimited
*  hard    nofile      1048576
*  soft    nofile      1048576
*  soft    nproc       unlimited
*  hard    nproc       unlimited
*  soft    rss       unlimited
*  hard    rss       unlimited
*  soft    sigpending       unlimited
*  hard    sigpending       unlimited
*  soft    stack       unlimited
*  hard    stack       unlimited

sysctl.conf

# /etc/sysctl.conf
net.ipv4.ip_forward=0
net.ipv6.conf.all.forwarding=0
kernel.sysrq = 1
kernel.panic = 300
fs.file-max = 1048576
kernel.pid_max = 999999
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.ipv4.tcp_rmem = 4096 65536 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216
vm.max_map_count = 1048576