萬惡的hadoop，在有老師的指導書下還出現了各種各樣的錯誤。
在第一版啟動hadoop沒有權限后，我開始了第二次嘗試。這次我為區分各台虛擬機將用戶名又初版的 wxy 改成了各自的主機名，結果在裝ssh時出現了這個錯誤
[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).
一直提示 Permission denied, please try again. 盡管我密碼正確。
[master@master .ssh]$ ssh-copy-id -i ~/.ssh/id_rsa.pub master@slave2
加粗的部分為slave2的用戶名和主機名，應該為 slave2@slave2 ，再運行命令即可
[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.
輸入密碼，成功執行。
注意 "ssh 'slave2@slave2'" ，他會提示如何用ssh連接slave2，如果你直接 ssh slave2 還是會報錯
[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).
而使用 ssh 'slave2@slave2' 則能正常免密登陸。
[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
經查ip確定為slave2，問題解決！
如果問題解決了，如果你在裝Hadoop，那么快跑！重建用戶名，重新操作！
網上有不同用戶名的登錄教程，但是我看不懂，所以我選擇直接重裝......
看到這篇文章的可以試一下這個辦法，不行的話就是配置文件和密碼的錯誤了，可以留言一起討論。