SSH session key （证书认证方式SSH登录配置）

Create the authorized_keys on client 
ssh-keygen -t rsa

Copy the public key to the hostAdd public key info into authorized_keys file (On the host)
cat id_rsa.pub >> /home/[user]/.ssh/authorized_keysLog in ssh without known-host verification

ssh user@ip -o UserKnownHostsFile=/dev/Null -o StrictHostKeyChecking=no