linux中ssh免密通信的实现

  [root@www ~]# ssh-keygen -t rsa -P ''   Generating public/private rsa key pair.  Enter file in which to save the key (/root/.ssh/id_rsa):   /root/.ssh/id_rsa already exists.  Overwrite (y/n)?

  [root@www ~]#ssh-copy-id -i .ssh/id_rsa.pub root@172.16.75.1  /usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: ".ssh/id_rsa.pub"  The authenticity of host '172.16.75.1 (172.16.75.1)' can't be established.  ECDSA key fingerprint is SHA256:YXhbTS9MfK2IQC4gtOW4RL8voHvFqC1cAAMJXuF3Wec.  ECDSA key fingerprint is MD5:2c:c0:94:e8:3a:e4:74:88:c0:d8:e0:01:20:81:1d:8e.  Are you sure you want to continue connecting (yes/no)? yes  /usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed  /usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys  root@172.16.75.1's password:   Number of key(s) added: 1  Now try logging into the machine, with:  "ssh 'root@172.16.75.1'"  and check to make sure that only the key(s) you wanted were added.