linux系统调优及安全设置

Posted 2021-01-08

（1）关闭SELinux功能

它是美国安全局（NSA）对于强制访问控制的实现，我们需要把它关闭这也是生产环境的做法。

[[email protected] ~]#sed -i ‘s#SELINUX=enforcing#SELINUX=diasbled#g‘ /etc/selinux/config
[[email protected] ~]# cat /etc/selinux/config
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
# enforcing - SELinux security policy is enforced.
# permissive - SELinux prints warnings instead of disabled.
# disabled - No SELinux policy is loaded.
SELINUX=diasbled 
# SELINUXTYPE= can take one of these two values:
# targeted - Targeted processes are protected,
# mls - Multi Level Security protection.
SELINUXTYPE=targeted
[[email protected] ~]# grep "SELINUX=diasbled" /etc/selinux/config
SELINUX=disabled

查看selinux的状态

[[email protected] ~]# getenforce
Enforcing

修改完文件还是enforcing,只有重启才能生效生产中又不能重启服务器，我们可以用setenforce来设置

[[email protected] ~]# setenforce
usage:  setenforce [ Enforcing | Permissive | 1 | 0 ]

enforcing的状态是1 ，Permissive的状态是0 警告不影响，所以我们不用重启服务器，可以将selinux的状态设置为0

[[email protected] ~]# setenforce 0
[[email protected] ~]# getenforce
Permissive

（2）关闭防火墙

[[email protected] ~]# /etc/init.d/iptables stop
iptables: Setting chains to policy ACCEPT: filter  [  OK  ]
iptables: Flushing firewall rules:   [  OK  ]
iptables: Unloading modules: [  OK  ]
[[email protected] ~]# /etc/init.d/iptables status
iptables: Firewall is not running.

永久关闭防火墙，禁止其开机自启动

[[email protected] ~]# chkconfig iptables off

（3）linux中文显示设置

字符集的调整

[[email protected] ~]# cat /etc/sysconfig/i18n 
LANG="zh_CN.UTF-8"
SYSFONT="latarcyrheb-sun16"

（4）历史记录数及登录超时环境变量设置

用export TMOUT=10来设置超过10秒退出用户

也可以追加到/etc/profile里面让它永久生效,source /etc/profile