empty /var/log/messages

1. Problems

Prompt when using to add an empty database echoto itmessagesOperation not permitted

Two, the solution

[root@centos log]# lsattr messages   //查看messages的扩展权限
-----a---------- messages
[root@centos log]# chattr -a messages    //清除a权限
[root@centos log]# lsattr messages     //再次查看a权限已经清除
---------------- messages
[root@centos log]# echo "" > messages    //使用echo追加空到messages
[root@centos log]# ls -lash messages      //查看messages大小
4.0K -rw------- 1 root root 2.0K Nov 17 09:14 messages
[root@centos log]# chattr +a messages   //谨慎起见再次把a权限加回去
[root@centos log]# lsattr messages     //a权限添加成功
-----a---------- messages