## Bugfix: reserve 512MB memory for system
echo "vm.min_free_kbytes = 524288" >> /etc/sysctl.conf
sysctl -p

## Increase max user watches
# BUG FIX : No space left on device
echo 1048576 > /proc/sys/fs/inotify/max_user_watches
echo "fs.inotify.max_user_watches=1048576" >> /etc/sysctl.conf
sysctl -p /etc/sysctl.conf

## Increase max FD limit / ulimit
cat <<EOF >> /etc/security/limits.conf
# eXtremeSHOK.com Increase max FD limit / ulimit
* soft     nproc          256000
* hard     nproc          256000
* soft     nofile         256000
* hard     nofile         256000
root soft     nproc          256000
root hard     nproc          256000
root soft     nofile         256000
root hard     nofile         256000
EOF

## Enable TCP BBR congestion control
cat <<EOF > /etc/sysctl.d/10-kernel-bbr.conf
# eXtremeSHOK.com
# TCP BBR congestion control
net.core.default_qdisc=fq
net.ipv4.tcp_congestion_control=bbr
EOF

## Increase kernel max Key limit
cat <<EOF > /etc/sysctl.d/60-maxkeys.conf
# eXtremeSHOK.com
# Increase kernel max Key limit
kernel.keys.root_maxkeys=1000000
kernel.keys.maxkeys=1000000
EOF

## Set systemd ulimits
echo "DefaultLimitNOFILE=256000" >> /etc/systemd/system.conf
echo "DefaultLimitNOFILE=256000" >> /etc/systemd/user.conf
echo 'session required pam_limits.so' | tee -a /etc/pam.d/common-session-noninteractive
echo 'session required pam_limits.so' | tee -a /etc/pam.d/common-session
echo 'session required pam_limits.so' | tee -a /etc/pam.d/runuser-l

## Set ulimit for the shell user
cd ~ && echo "ulimit -n 256000" >> .bashrc ; echo "ulimit -n 256000" >> .profile