SSH的一些常用配置

作为后端开发人员或者运维人员， SSH 是必不可少的好帮手。下面将罗列一些常用的tips，以后也会陆续更新。

SSH welcome message modification

1. vim /etc/ssh/sshd_config

Change the setting PrintLastLog to "no"

Change the setting PermitRootLogin to "yes"

2. vim /etc/motd

    Change the content to what you want.

3. service sshd restart or  /etc/init.d/ssh restart

SSH login without password

1. generate local key

ssh-keygen

This will generate id_rsa.pub and id_rsa in ~/.ssh/

2. Copy public key to target machine

ssh-copy-id user@target

then it will login without passwd.

3. Sometimes you will need to login with root permission

vim /etc/ssh/sshd_config

Change "PermitRootLogin yes" 

4. Restart ssh service

/etc/init.d/ssh restart

Keep SSH Alive

Add the following line to the /etc/ssh/ssh_config file:

ServerAliveInterval 60