配置完ssh无密码登录后用 ssh localhost 可以正常登录,而用 ssh hadoop 登录失败,如下:
[hadoop@hadoop000 ~]$ ssh localhost
Last login: Sat Jun 27 17:11:39 2020
[hadoop@hadoop000 ~]$ exit
logout
Connection to localhost closed.
[hadoop@hadoop000 ~]$ ssh hadoop000
ssh: connect to host hadoop000 port 22: Network is unreachable