使用ssh-keygen和ssh-copy-id三步实现SSH无密码登陆 和ssh经常使用命令

ssh-keygen  产生公钥与私钥对.

ssh-copy-id 将本机的公钥复制到远程机器的authorized_keys文件中，ssh-copy-id也能让你有到远程机器的home, ~./ssh , 和 ~/.ssh/authorized_keys的权利

第一步:在本地机器上使用ssh-keygen产生公钥私钥对

1. zhz@zhz:~/$ ssh-keygen
   Generating public/private rsa key pair.
   Enter file in which to save the key (/home/zhz/.ssh/id_rsa):
2. Enter passphrase (empty for no passphrase): [Press enter key
3. same passphrase again: [Pess enter key]
4. Your identification has been saved in /home/zhz/.ssh/id_rsa.
5. Your public key has been saved in /home/zhz/.ssh/id_rsa.pub.

第二步:用ssh-copy-id将公钥复制到远程机器中

1. zhz@zhz:~$  ssh-copy-id -i .ssh/id_rsa.pub  用户名字@192.168.x.xxx
    

注意: ssh-copy-id 将key写到远程机器的 ~/ .ssh/authorized_key.文件中

第三步: 登陆到远程机器不用输入密码

1. zhz@zhz:~$  ssh 用户名字@192.168.x.xxx