虚拟机免密登录设置完，登录节点一直需要输入密码怎么办？

2024年5月9日 80次阅读 来源: zhaozuoyou

先看问题提示：

[root@data ~]# start-dfs.sh
Starting namenodes on [data]

root@data's password: 
data: starting namenode, logging to
 /opt/software/hadoop260/logs
 /hadoop-root-namenode-data.out
 
root@localhost's password: 
localhost: starting datanode, logging to 
/opt/software/hadoop260/logs
/hadoop-root-datanode-data.out
Starting secondary namenodes [0.0.0.0]

root@0.0.0.0's password: 
0.0.0.0: starting secondarynamenode, logging to
/opt/software/hadoop260/logs
/hadoop-root-secondarynamenode-data.out

首先确定免密是否做好，建议直接重做:

删除所有文件后输入ssh-keygen -t rsa
连续按三次enter
切换到.ssh目录下 cd /root/.ssh
ssh-copy-id -i id_rsa.pub root@主机名
ssh root@主机名
提示还是需要输入密码
root@data's password: 
Last failed login: Sat Apr 10 09:52:11 CST 2021
from localhost on ssh:notty
There was 1 failed login attempt since 
the last successful login.
Last login: Sat Apr 10 09:48:27 2021 
from 192.168.133.1
[root@data ~]# exit

先看.ssh中文件的权限

[root@data .ssh]# ll
total 16
-rw-------. 1 root root  782 Apr 10 10:11 authorized_keys
-rw-------. 1 root root 1679 Apr 10 09:55 id_rsa
-rw-------. 1 root root  391 Apr 10 09:55 id_rsa.pub
-rw-------. 1 root root  522 Apr 10 09:14 known_hosts
文件权限不足，修改文件权限
[root@data .ssh]# chmod -R 644 id_rsa.pub 
[root@data .ssh]# chmod -R 644 known_hosts 
[root@data .ssh]# chmod -R 600 id_rsa
[root@data .ssh]# ll
total 16
-rw-r--r--. 1 root root  782 Apr 10 10:11 authorized_keys
-rw-------. 1 root root 1679 Apr 10 09:55 id_rsa
-rw-r--r--. 1 root root  391 Apr 10 09:55 id_rsa.pub
-rw-r--r--. 1 root root  522 Apr 10 09:14 known_hosts

再次尝试

[root@data .ssh]# ssh root@data
root@data's password: 
Last login: Sat Apr 10 10:11:30 2021 from data
还是需要输入密码

查看/root的权限

[root@data ~]# cd ../
[root@data /]# ll
total 28
lrwxrwxrwx.   1 root root    7 Apr  8 00:35 bin -> usr/bin
dr-xr-xr-x.   5  777 root 4096 Apr  8 00:39 boot
drwxr-xr-x.  20 root root 3260 Apr 10 09:48 dev
drwxr-xr-x.  76 root root 8192 Apr 10 09:48 etc
drwxr-xr-x.   3 root root   24 Apr  8 00:38 home
lrwxrwxrwx.   1 root root    7 Apr  8 00:35 lib -> usr/lib
lrwxrwxrwx.   1 root root    9 Apr  8 00:35 lib64 -> usr/lib64
drwxr-xr-x.   2 root root    6 Apr 11  2018 media
drwxr-xr-x.   2 root root    6 Apr 11  2018 mnt
drwxr-xr-x.   5 root root   50 Apr  8 18:27 opt
dr-xr-xr-x. 142 root root    0 Apr 10 09:48 proc
dr-xr-x---.   5  777 root 4096 Apr  9 16:54 root
drwxr-xr-x.  24 root root  660 Apr 10 09:48 run
lrwxrwxrwx.   1 root root    8 Apr  8 00:35 sbin -> usr/sbin
drwxr-xr-x.   2 root root    6 Apr 11  2018 srv
dr-xr-xr-x.  13 root root    0 Apr 10 09:48 sys
drwxrwxrwt.  50 root root 4096 Apr 10 10:11 tmp
drwxr-xr-x.  13 root root  155 Apr  8 00:35 usr
drwxr-xr-x.  19 root root  267 Apr  8 00:39 var

root权限足够但是所有者权限不对，修改所有者777为root

[root@data /]# chown -R root root
[root@data /]# ll
total 28
lrwxrwxrwx.   1 root root    7 Apr  8 00:35 bin -> usr/bin
dr-xr-xr-x.   5  777 root 4096 Apr  8 00:39 boot
drwxr-xr-x.  20 root root 3260 Apr 10 09:48 dev
drwxr-xr-x.  76 root root 8192 Apr 10 09:48 etc
drwxr-xr-x.   3 root root   24 Apr  8 00:38 home
lrwxrwxrwx.   1 root root    7 Apr  8 00:35 lib -> usr/lib
lrwxrwxrwx.   1 root root    9 Apr  8 00:35 lib64 -> usr/lib64
drwxr-xr-x.   2 root root    6 Apr 11  2018 media
drwxr-xr-x.   2 root root    6 Apr 11  2018 mnt
drwxr-xr-x.   5 root root   50 Apr  8 18:27 opt
dr-xr-xr-x. 142 root root    0 Apr 10 09:48 proc
dr-xr-x---.   5 root root 4096 Apr  9 16:54 root
drwxr-xr-x.  24 root root  660 Apr 10 09:48 run
lrwxrwxrwx.   1 root root    8 Apr  8 00:35 sbin -> usr/sbin
drwxr-xr-x.   2 root root    6 Apr 11  2018 srv
dr-xr-xr-x.  13 root root    0 Apr 10 09:48 sys
drwxrwxrwt.  50 root root 4096 Apr 10 10:11 tmp
drwxr-xr-x.  13 root root  155 Apr  8 00:35 usr
drwxr-xr-x.  19 root root  267 Apr  8 00:39 var

成功解决

[root@data .ssh]# ssh root@data
Last login: Sat Apr 10 10:15:28 2021 from data
[root@data ~]# exit
logout
Connection to data closed.
    原文作者：zhaozuoyou
    原文地址: https://blog.csdn.net/zhaozuoyou/article/details/115565643
    本文转自网络文章，转载此文章仅为分享知识，如有侵权，请联系博主进行删除。
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