一、概述
搭建mysql数据库并做安全加固
ln -s /dev/null /home/mysql/.mysql_history
vi /home/mysql/.profile
export MYSQL_HISTFILE=/dev/null
第二次登陆到root，切换mysql用户，直接报错
-bash: /dev/null: Permission denied
-bash: /dev/null: Permission denied
-bash: /dev/null: Permission denied
-bash: /dev/null: Permission denied
-bash: /dev/null: Permission denied
-bash: /dev/null: Permission denied
查看/dev/null权限
ll /dev/null
-rwxr-x--- 1 root root 9 Jul 25 17:07 null
而其他正常的权限如下
crw-rw-rw- 1 root wheel 3, 2 Jul 25 14:08 null
解决步骤如下：
rm -f /dev/null; mknod -m 666 /dev/null c 1 3
