在第一版启动hadoop没有权限后，我开始了第二次尝试。这次我为区分各台虚拟机将用户名又初版的 wxy 改成了各自的主机名，结果在装ssh时出现了这个错误
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[master@master .ssh]$ ssh-copy-id -i ~/.ssh/id_rsa.pub master@slave2
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: “/home/master/.ssh/id_rsa.pub”
/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
master@slave2’s password:
Permission denied, please try again.
master@slave2’s password:
Permission denied, please try again.
master@slave2’s password:
Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).
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一直提示 Permission denied, please try again. 尽管我密码正确。
[master@master .ssh]$ ssh-copy-id -i ~/.ssh/id_rsa.pub master@slave2
加粗的部分为slave2的用户名和主机名，应该为 slave2@slave2 ，再运行命令即可
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[master@master .ssh]$ ssh-copy-id -i ~/.ssh/id_rsa.pub slave2@slave2
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: “/home/master/.ssh/id_rsa.pub”
/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
slave2@slave2’s password:
Number of key(s) added: 1
Now try logging into the machine, with: “ssh ‘slave2@slave2’”
and check to make sure that only the key(s) you wanted were added.
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输入密码，成功执行。
注意 “ssh ‘slave2@slave2’” ，他会提示如何用ssh连接slave2，如果你直接 ssh slave2 还是会报错
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[master@master .ssh]$ ssh slave2
master@slave2’s password:
Permission denied, please try again.
master@slave2’s password:
Permission denied, please try again.
master@slave2’s password:
Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).
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而使用 ssh ‘slave2@slave2’ 则能正常免密登陆。
[master@master .ssh]$ ssh ‘slave2@slave2’
Last login: Wed Oct 20 04:27:04 2021
[slave2@slave2 ~]$ ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.18.132 netmask 255.255.255.0 broadcast 192.168.18.255
经查ip确定为slave2，问题解决！
如果问题解决了，如果你在装Hadoop，那么快跑！重建用户名，重新操作！
网上有不同用户名的登录教程，但是我看不懂，所以我选择直接重装…