Linux根目录缺少x权限,产生的两个错误
错误一:root用户执行systemctl命令报误
[root@node1 ~]# systemctl restart sshd
* (pkttyagent:10364): WARNING *: Unable to register authentication agent: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.PolicyKit1 was not provided by any .service files
Error registering authentication agent: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.PolicyKit1 was not provided by any .service files (g-dbus-error-quark, 2)
错误二:root用户切换到普通用户报错
[root@node1 ~]# useradd test
[root@node1 ~]# su - test
su: warning: cannot change directory to /home/aihps: Permission denied
su: failed to execute /bin/bash: Permission denied
解决方法
[root@node1 ~]# stat /
File: ‘/’
Size: 4096 Blocks: 8 IO Block: 4096 directory
Device: fd01h/64769d Inode: 2 Links: 23
Access: (0600/drw——-) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2016-05-30 09:54:45.692000000 +0800
Modify: 2016-05-25 15:41:46.204000000 +0800
Change: 2016-05-25 15:41:46.204000000 +0800
Birth: -
问题出来了,根目录没有X权限!
解决办法修改根目录权限。
[root@node1 ~]#chmod 755 /
修改后,问题消失。
产生上述问题的操作:
第一种,chmod 600 /,可以导致。 (在内核3.10.0-693.el7.x86_64的CentOS7下好像规避了root用户systemctl权限不足的问题)
第二种,chmod 700 /lib/ld-xxxx.so,也可以导致su失败。 (在内核3.10.0-693.el7.x86_64的CentOS7下无该文件)
/ 权限的丢失对于各种运行在自己用户身份上的daemon也存在同样的影响。