Centos系统下“无法打开并写入文件”问题的解决

root@pts/1 $ getfacl /etc/ssh/sshd_config
getfacl: Removing leading '/' from absolute path names
# file: etc/ssh/sshd_config
# owner: root
# group: root
user::rw-
group::---
other::---

root@pts/1 $ yum install e2fsprogs
设置安装进程
解决依赖关系
--> 执行事务检查
---> Package e2fsprogs.x86_64 0:1.41.12-18.el6_5.1 will be 升级
---> Package e2fsprogs.x86_64 0:1.41.12-23.el6 will be an update
--> 处理依赖关系 libss = 1.41.12-23.el6，它被软件包 e2fsprogs-1.41.12-23.el6.x86_64 需要

... ...

更新完毕:
 e2fsprogs.x86_64 0:1.41.12-23.el6

作为依赖被升级:
 e2fsprogs-libs.x86_64 0:1.41.12-23.el6  libcom_err.x86_64 0:1.41.12-23.el6  libcom_err-devel.x86_64 0:1.41.12-23.el6
 libss.x86_64 0:1.41.12-23.el6

root@pts/1 $ lsattr /etc/ssh/sshd_config
----i--------e- /etc/ssh/sshd_config

root@pts/1 $ chattr -i /etc/ssh/sshd_config
iZ25zjpz5pqZ [~] 2017-12-16 10:59:14
root@pts/1 $ lsattr /etc/ssh/sshd_config
-------------e- /etc/ssh/sshd_config
iZ25zjpz5pqZ [~] 2017-12-16 10:59:17
root@pts/1 $ vim /etc/ssh/sshd_config
iZ25zjpz5pqZ [~] 2017-12-16 10:59:26
root@pts/1 $