Private Login

1. Create a file my_keypair.pem

内容为ssh-keygen生成的私钥内容，测试发现随便填不行

2, modify the permissions

chmod 400 my_keypair.pem

Generating a secret key by the public key

ssh-keygen -y -f my_keypair.pem

ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDm2CeuTjuI2DtuUlMoLWQnQWVVq2eQk0iSLTN0grNLV3r5gO+Wl0iAOx3XEZOlJlMGH0DNoWrZgFgzYhM/nk/4vDHJkgSyObdckz/+ew4AA+KaQyjSNgexa0ek8D3zDDFHT0Ro2wv+t/zM7mitI1MghQkJ9LhJDKmmJLe/SsGzsqsvfuLpbSjwAluqaYqSb84MMzWF6gKOnGBUwa/QXOvNpmykohhPyAaKIMGDVnSpZG4/Lf/J89HCsJszp+sb0EAHLVlbYwCq2uaDYU2SCjCwYPBdKak3tyvK6GOww09pqWf0I6owWv7vR5rZBmGW28rwqUfjIh8BcZj4hMuhnhFn

3, the public key into the authorized_keys
4, the private key is stored in the client pem

ssh -i ~/.ssh/my_ssh_keypair.pem root@线上IP

5, delete the test server pem, and they can log on