ssh key文件登录服务器

服务端生成  pem

ssh-keygen -t rsa

pem文件传到客户端，客户端用该文件登录

ssh -i  xx.pem username@serverip

提示

Permissions 0644 for 'test.pem' are too open.
 It is required that your private key files are NOT accessible by others.
 This private key will be ignored.

需要chmod 600 xx.pem

退出ssh，敲exit