Debian 8 Shadowsocks Setup Pre-steps

1. Change SSH Port

Connect ssh root@host

Change SSH port. vi /etc/ssh/sshd_config

Locate line: #Port 22

Remove # and change 22 to other port number like 22233.

Restart the sshd service: service sshd restart

Shortcut connect script file.

#!/bin/sh
ssh -p 22233 root@host -o ServerAliveInterval=30

You can login with this command:
./you_script_file_name

2. Add SSH Public Key to Server

How to set up ssh that make you not need input password when login

Run ssh-keygen on your machine, and just hit enter when asked for a password.
This will generate both a private and a public key. With older SSH versions, they will be stored in ~/.ssh/identity and ~/.ssh_identity.pub; with newer ones, they will be stored in ~/.ssh/id_rsa and ~/.ssh/id_rsa.pub.
Next, add the contents of the public key file into ~/.ssh/authorized_keys on the remote host (the file should be mode 600).

This step may need “mkdir .ssh” directory

3. Disable Password Authentication

vi /etc/ssh/sshd_config

vi /etc/ssh/sshd_config

ChallengeResponseAuthentication no
PasswordAuthentication no
UsePAM no

service sshd restart

4. Update System

apt-get update
apt-get dist-upgrade

5. Setup Shadowsocks

Recommand shadowsocks server on Github