enable bbr in OpenVZ VPS

bbr.sh

#!/bin/bash 

fuser -k /dev/net/tun 
# delete tap0 
ip tuntap del dev tap0 mode tap 

# add tap0 
ip tuntap add dev tap0 mode tap 
ip link set dev tap0 up 
ip addr add dev tap0 10.0.0.1/24 
sysctl -w net.ipv4.ip_forward=1 
iptables -P FORWARD ACCEPT 

# delete old iptables rules 
#iptables -t nat -D POSTROUTING -o venet0 -j MASQUERADE 
iptables -t nat -D PREROUTING -i venet0 -p tcp --dport 11840 -j DNAT --to-destination 10.0.0.2 

# add iptables rules 
#iptables -t nat -A POSTROUTING -o venet0 -j MASQUERADE 
iptables -t nat -A PREROUTING -i venet0 -p tcp --dport 11840 -j DNAT --to-destination 10.0.0.2 

LD_PRELOAD=/root/haproxy/liblkl-hijack.so \
LKL_HIJACK_NET_QDISC="root|fq" \
LKL_HIJACK_SYSCTL="net.ipv4.tcp_congestion_control=bbr;net.ipv4.tcp_wmem=4096 65536 67108864" \
LKL_HIJACK_NET_IFTYPE="tap" \
LKL_HIJACK_NET_IFPARAMS="tap0" \
LKL_HIJACK_NET_IP="10.0.0.2" \
LKL_HIJACK_NET_NETMASK_LEN="24" \
LKL_HIJACK_NET_GATEWAY="10.0.0.1" \
LKL_HIJACK_OFFLOAD="0x8883" \
haproxy -f /root/haproxy/haproxy.cfg &

exit

haproxy.cfg

global
user haproxy
group haproxy

defaults
mode tcp
timeout connect 5s
timeout client 60s
timeout server 60s

listen shadowsocks
bind 10.0.0.2:11840
server server1 10.0.0.1:1184