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Optimize sysctl settings

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- Improve VPN performance by optimizing sysctl settings, such as tuning
  TCP buffer sizes and enabling the TCP BBR congestion control algorithm
  on supported systems (kernel versions 4.20 and newer).
- References:
  https://cloud.google.com/blog/products/networking/tcp-bbr-congestion-control-comes-to-gcp-your-internet-just-got-faster
  https://github.com/google/bbr/blob/master/Documentation/bbr-quick-start.md
  https://github.com/hwdsl2/setup-ipsec-vpn/blob/master/docs/bbr.md
This commit is contained in:
hwdsl2
2022-09-08 23:33:56 -05:00
parent fb7de43826
commit 401edc5bde
1 changed files with 31 additions and 11 deletions
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42
openvpn-install.sh
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@@ -122,6 +122,35 @@ get_export_dir () {
fi
}
update_sysctl () {
# Enable net.ipv4.ip_forward for the system
echo 'net.ipv4.ip_forward=1' > /etc/sysctl.d/99-openvpn-forward.conf
if [[ -n "$ip6" ]]; then
# Enable net.ipv6.conf.all.forwarding for the system
echo "net.ipv6.conf.all.forwarding=1" >> /etc/sysctl.d/99-openvpn-forward.conf
fi
# Optimize sysctl settings such as TCP buffer sizes
cat > /etc/sysctl.d/99-openvpn-optimize.conf <<'EOF'
kernel.msgmnb = 65536
kernel.msgmax = 65536
net.core.wmem_max = 16777216
net.core.rmem_max = 16777216
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 87380 16777216
EOF
# Enable TCP BBR congestion control if kernel version >= 4.20
if modprobe -q tcp_bbr \
&& printf '%s\n%s' "4.20" "$(uname -r)" | sort -C -V; then
cat >> /etc/sysctl.d/99-openvpn-optimize.conf <<'EOF'
net.core.default_qdisc = fq
net.ipv4.tcp_congestion_control = bbr
EOF
fi
# Apply sysctl settings
sysctl -e -q -p /etc/sysctl.d/99-openvpn-forward.conf
sysctl -e -q -p /etc/sysctl.d/99-openvpn-optimize.conf
}
new_client () {
get_export_dir
# Generates the custom client.ovpn
@@ -422,16 +451,7 @@ crl-verify crl.pem" >> /etc/openvpn/server/server.conf
if [[ "$protocol" = "udp" ]]; then
echo "explicit-exit-notify" >> /etc/openvpn/server/server.conf
fi
# Enable net.ipv4.ip_forward for the system
echo 'net.ipv4.ip_forward=1' > /etc/sysctl.d/99-openvpn-forward.conf
# Enable without waiting for a reboot or service restart
echo 1 > /proc/sys/net/ipv4/ip_forward
if [[ -n "$ip6" ]]; then
# Enable net.ipv6.conf.all.forwarding for the system
echo "net.ipv6.conf.all.forwarding=1" >> /etc/sysctl.d/99-openvpn-forward.conf
# Enable without waiting for a reboot or service restart
echo 1 > /proc/sys/net/ipv6/conf/all/forwarding
fi
update_sysctl
if systemctl is-active --quiet firewalld.service; then
# Using both permanent and not permanent rules to avoid a firewalld
# reload.
@@ -681,7 +701,7 @@ else
fi
systemctl disable --now openvpn-server@server.service
rm -f /etc/systemd/system/openvpn-server@server.service.d/disable-limitnproc.conf
rm -f /etc/sysctl.d/99-openvpn-forward.conf
rm -f /etc/sysctl.d/99-openvpn-forward.conf /etc/sysctl.d/99-openvpn-optimize.conf
if [[ "$os" = "debian" || "$os" = "ubuntu" ]]; then
(
set -x