ssh

key:

ssh-keygen -t rsa -b 4096 -C "intbird@163.com" ~/.ssh/id_rsa

local:
cat /Users/intbird/.ssh/id_rsa_vps.pub >> ~/.ssh/authorized_keys

remote:
ssh-copy-id -i  ~/.ssh/id_rsa_vps.pub root@pi.intbird.com
chmod 600 .ssh/authorized_keys


sshd:
sed -i 's/Port 27081/Port 22/g' /etc/ssh/sshd_config

PubkeyAuthentication/ PasswordAuthentication

ssh -i ~/.ssh/vps/id_rsa root@216.24.255.235 -p 22

chmod

1. r=读取属性　　//值＝4
2. w=写入属性　　//值＝2
3. x=执行属性　　 //值＝1

useradd

sudo usermod -aG docker ec2-user

查看用户 
cut -d: -f1 /etc/passwd

添加用户 
adduser intbird
passwd intbird
userdel -r intbird

切换用户
su intbird



Too much ....
https://intbird.atlassian.net/