另一种公钥私钥认证方式

A机器到B机器无密

在A机器上操作：

vim ~/.ssh/config

Host 192168
    Hostname 192.168.1.2
    User root
    IdentityFile ~/.ssh/id_rsa

ssh-keygen

cat id_rsa.pub

ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA1Bo9dpBxfTqb4qzJ1K2cZCrc/D43hMV4aeGn7m9Q8LgnDAC+/YJANjJ/TeIPJDOuVAEZD23eoOT1j1EtOJLV5wjr8NLtoT5rJAqelnKfiJiW4BhrimGh5te1BVfTq2OjBIEsg+urfD02CwwvWVjWCo2hBRqnigIm7UnQp9I36ggu1rtko1vvg9E8/gI9IFieZUX4R0YxY/1PHsYhQXdOy0xnJi+e2qGBXCMKELmumPuYZpw+9c/+Yi8Jcj4Xccct4PgQHfa0kICec9CeuYF5P1FRQpp+BcoTUTVs8i39ECJvU0FWddzh4sWTxNW9ZDSQE66387DNelUcBI/Kxm4G8w== 

将如下内容复制到B机器上的vim ~/.ssh/authorized_keys里边

在A机器上执行ssh 192168（Host名字）即可无密登录到目标机