The authenticity of host 'localhost (127.0.0.1)' can't be established的处理方法

ssh localhost的时候遇到：

ubuntu@VM-0-15-ubuntu:~/taoge/hadoop_begin/hadoop-2.7.5$ ssh localhost
The authenticity of host 'localhost (127.0.0.1)' can't be established.

怎么办？

ubuntu@VM-0-15-ubuntu:~/.ssh$ chmod 777 /etc/ssh/ssh_config

然后在这个文件的最后两行加上：

    StrictHostKeyChecking noUserKnownHostsFile /dev/null

如下：

ubuntu@VM-0-15-ubuntu:~$ tail /etc/ssh/ssh_config
#   PermitLocalCommand no
#   VisualHostKey no
#   ProxyCommand ssh -q -W %h:%p gateway.example.com
#   RekeyLimit 1G 1hSendEnv LANG LC_*HashKnownHosts yesGSSAPIAuthentication yesGSSAPIDelegateCredentials noStrictHostKeyChecking noUserKnownHostsFile /dev/null
ubuntu@VM-0-15-ubuntu:~$

于是乎：

ubuntu@VM-0-15-ubuntu:~$ ssh localhost
Warning: Permanently added 'localhost' (ECDSA) to the list of known hosts.

搞定。后面的问题一路顺畅。

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