new VPS setup log

新建用户

useradd -m 用户名
passwd 用户名

将该用户赋予root权限(利用sudo命令，需要输入密码)

赋予文件读写权限：

chmod u+w /etc/sudoers

打开文件找到

root ALL = (ALL:ALL) ALL

下面添加

用户名 ALL = (ALL:ALL) ALL

取消读写权限：

chmod u-w /etc/sudoers

ssh configuration

create rsa key

ssh-keygen -t rsa

import public key

cd .ssh
cat id_rsa.pub >> authorized_keys
chmod 600 authorized_keys
chmod 700 ~/.ssh
sudo chmod u+w /etc/ssh/sshd_config
sudo vim /etc/ssh/sshd_config

find these lines and change to:

PermitRootLogin no
RSAAuthentication yes
PubkeyAuthentication yes

sudo chomod u-w /etc/ssh/sshd_config

use WINSCP to get id_rsa, open PuTTYGen, load file, add necessary information, then save private key open PuTTY, Connection -> SSH -> Auth, find Private key file for authentication and load it you could go back to /etc/ssh/sshd_config and add this line to deny password authentication, if you like:

PasswordAuthentication no