centos7 shadowsocks (modify from: http://morning.work/page/2015-12/install-shadowsocks-on-centos-7.html)

install-shadowsocks.sh

#!/bin/bash
# Install Shadowsocks on CentOS 7

echo "Installing Shadowsocks..."

useradd shadowsocks
read -p "input shadowsocks password: " SS_PASSWORD

CONFIG_FILE=/etc/shadowsocks.json
SERVICE_FILE=/etc/systemd/system/shadowsocks.service
SS_PORT=8388
SS_METHOD=aes-256-cfb
SS_IP=`ip route get 1 | awk '{print $NF;exit}'`

yum install python-pip -y

# install shadowsocks
pip install --upgrade pip
pip install shadowsocks

# create shadowsocls config
cat <<EOF | sudo tee ${CONFIG_FILE}
{
  "server": "0.0.0.0",
  "server_port": ${SS_PORT},
  "password": "${SS_PASSWORD}",
  "method": "${SS_METHOD}"
}
EOF

# create service
cat <<EOF | sudo tee ${SERVICE_FILE}
[Unit]
Description=Shadowsocks

[Service]
User=shadowsocks
TimeoutStartSec=0
ExecStart=/usr/bin/ssserver -c ${CONFIG_FILE}

[Install]
WantedBy=multi-user.target
EOF

# start service
systemctl enable shadowsocks
systemctl start shadowsocks

# view service status
sleep 5
systemctl status shadowsocks -l

echo "================================"
echo ""
echo "Congratulations! Shadowsocks has been installed on your system."
echo "You shadowsocks connection info:"
echo "--------------------------------"
echo "server:      ${SS_IP}"
echo "server_port: ${SS_PORT}"
echo "password:    ${SS_PASSWORD}"
echo "method:      ${SS_METHOD}"
echo "--------------------------------"