[root@master /]# chmod 700 /root
[root@master /]# chmod 700 /root/.ssh
[root@master /]# ll /root/.ssh
total 24
-rw-r--r--. 1 root root 401 Nov 29 08:37 172.20.10.6.id_rsa.pub
-rw-r--r--. 1 root root 401 Nov 29 08:39 172.20.10.7.id_rsa.pub
-rw-r--r--. 1 root root 400 Nov 29 08:28 authorized_keys
-rw-------. 1 root root 1671 Nov 29 08:27 id_rsa
-rw-r--r--. 1 root root 400 Nov 29 08:27 id_rsa.pub
-rw-r--r--. 1 root root 1961 Nov 29 10:15 known_hosts
[root@master /]# chmod 600 /root/.ssh/authorized_keys
[root@master /]# ll
total 98
dr-xr-xr-x. 2 root root 4096 Nov 29 05:12 bin
dr-xr-xr-x. 5 root root 1024 Nov 29 01:32 boot
drwxr-xr-x. 18 root root 3780 Dec 3 01:13 dev
drwxr-xr-x. 103 root root 12288 Dec 3 00:52 etc
drwxr-xr-x. 3 root root 4096 Nov 29 01:34 home
dr-xr-xr-x. 10 root root 4096 Nov 29 01:21 lib
dr-xr-xr-x. 9 root root 12288 Nov 29 05:12 lib64
drwx------. 2 root root 16384 Nov 29 01:14 lost+found
drwxr-xr-x. 2 root root 4096 Dec 3 01:13 media
drwxr-xr-x. 3 root root 4096 Nov 29 01:37 mnt
drwxr-xr-x. 3 root root 4096 Nov 29 01:40 opt
dr-xr-xr-x. 157 root root 0 Dec 3 00:32 proc
drwx------. 28 root root 4096 Dec 3 00:36 root
dr-xr-xr-x. 2 root root 12288 Nov 29 05:12 sbin
drwxr-xr-x. 7 root root 0 Dec 3 00:32 selinux
drwxr-xr-x. 2 root root 4096 Sep 23 2011 srv
drwxr-xr-x. 13 root root 0 Dec 3 00:32 sys
drwxrwxrwt. 36 root root 4096 Dec 3 01:30 tmp
drwxr-xr-x. 14 root root 4096 Oct 6 2015 usr
drwxr-xr-x. 21 root root 4096 Nov 29 01:28 var
[root@master /]#
