No protocol specified xhost: unable to open display

[[email protected] ~]$ xhost +
No protocol specified
xhost:  unable to open display "192.168.56.1:0.0"
[[email protected] ~]$ env|grep DISPLAY
DISPLAY=192.168.56.1:0.0
[[email protected] ~]$ exit
logout
[[email protected] ~]#  env|grep DISPLAY
DISPLAY=localhost:10.0

然后看看 /etc/hosts 发现了缺失 localhost 

[[email protected] ~]# cat /etc/hosts
192.168.56.129   hdp-01 

[ [email protected] ~]# vi /etc/hosts 127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.56.129   hdp-01   OJBK 了 [ [email protected] ~]# xhost + access control disabled, clients can connect from any host