Convenient script to install and setup shadowsocks with bbr enabled

shadowsocks_setup.sh

#!/bin/bash

echo "Usage:"
echo "  1. ./vultr_ss_setup.sh"
echo "  2. ./vultr_ss_setup.sh install"
echo "  3. ./vultr_ss_setup.sh bbr"

if [ $# -lt 1 ]
then
    # Start Shadowsocks
    nohup ssserver -c /etc/shadowsocks.json &
    exit
fi

if [ $1 = "install" ]
then
    # Install Shadowsocks
    yum install -y m2crypto python-setuptools
    easy_install pip
    pip install shadowsocks

    # Configuration
    touch /etc/shadowsocks.json
    echo "{" >> /etc/shadowsocks.json
    echo "    \"server\":\"0.0.0.0\"," >> /etc/shadowsocks.json
    echo "    \"server_port\":443," >> /etc/shadowsocks.json
    echo "    \"local_address\": \"127.0.0.1\"," >> /etc/shadowsocks.json
    echo "    \"local_port\":1080," >> /etc/shadowsocks.json
    echo "    \"password\":\"majun\"," >> /etc/shadowsocks.json
    echo "    \"timeout\":300," >> /etc/shadowsocks.json
    echo "    \"method\":\"aes-256-cfb\"," >> /etc/shadowsocks.json
    echo "    \"fast_open\": false" >> /etc/shadowsocks.json
    echo "}" >> /etc/shadowsocks.json

    # Firewall
    systemctl start firewalld
    firewall-cmd --permanent --zone=public --add-port=443/tcp
    firewall-cmd --reload

    # Upgrade Kernel
    rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
    rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm
    yum --enablerepo=elrepo-kernel install kernel-ml -y
    rpm -qa | grep kernel
    grub2-set-default 1
    shutdown -r now
fi

if [ $1 = "bbr" ]
then
    # Enable BBR
    uname -r
    echo 'net.core.default_qdisc=fq' | sudo tee -a /etc/sysctl.conf
    echo 'net.ipv4.tcp_congestion_control=bbr' | sudo tee -a /etc/sysctl.conf
    sysctl -p
    sysctl net.ipv4.tcp_available_congestion_control
    sysctl -n net.ipv4.tcp_congestion_control
    lsmod | grep bbr
fi

NOTE:

It only works for operating systems which adopt yum package manager such as CentOS.