一、准备工作
1.1、服务器准备
操作系统：centos 7.x
1.2、安装好用的文本编辑工具nano
# yum -y install nano
二、关闭SELinux
2.1、查看SELinux状态
2.1.1、第一种：查看SELinux状态方法
# /usr/sbin/sestatus
SELinux status: enabled
SELinuxfs mount: /sys/fs/selinux
SELinux root directory: /etc/selinux
Loaded policy name: targeted
Current mode: enforcing
Mode from config file: enforcing
Policy MLS status: enabled
Policy deny_unknown status: allowed
Max kernel policy version: 31
2.1.2、第二种：查看SELinux状态方法
# getenforce
Enforcing
2.2、临时关闭SELinux
# setenforce 0
2.2.1、临时关闭后第一种方法查看SELinux状态
# /usr/sbin/sestatus
SELinux status: enabled
SELinuxfs mount: /sys/fs/selinux
SELinux root directory: /etc/selinux
Loaded policy name: targeted
Current mode: permissive //注意这里是 permissive
Mode from config file: enforcing
Policy MLS status: enabled
Policy deny_unknown status: allowed
Max kernel policy version: 31
2.2.2、临时关闭后第二种方法查看SELinux状态
# getenforce
Permissive
2.2.3、临时关闭后可以再次打开SELinux
# setenforce 1
2.3、永久关闭SELinux
2.3.1、修改配置文件/etc/sysconfig/selinux
# nano /etc/sysconfig/selinux
selinux=enforcing 改为 selinux=disabled
# 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 enforcing.
# disabled - No SELinux policy is loaded.
# ↓↓↓↓这里修改成disabled
SELINUX=disabled
# SELINUXTYPE= can take one of three values:
# targeted - Targeted processes are protected,
# minimum - Modification of targeted policy. Only selected processes are protected.
# mls - Multi Level Security protection.
SELINUXTYPE=targeted
2.3.2、重启后新配置生效
# reboot
2.3.3、临时关闭后第一种方法查看SELinux状态
# /usr/sbin/sestatus
SELinux status: disabled
2.3.4、临时关闭后第二种方法查看SELinux状态
# getenforce
Disabled
三、关闭防火墙firewall
3.1、查看防火墙状态
# systemctl status firewalld
防火墙开启状态下显示如下
● firewalld.service - firewalld - dynamic firewall daemon
Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled)
//这行是我添加的备注↓↓↓注意这里的 active (running)
Active: active (running) since Wed 2020-01-01 17:05:47 CST; 9s ago
Docs: man:firewalld(1)
Main PID: 6787 (firewalld)
CGroup: /system.slice/firewalld.service
└─6787 /usr/bin/python2 -Es /usr/sbin/firewalld --nofork --nopid
Jan 01 17:05:47 iZuf65lq1u9ra1ohnf5kebZ systemd[1]: Starting firewalld - dynamic firewall daemon...
Jan 01 17:05:47 iZuf65lq1u9ra1ohnf5kebZ systemd[1]: Started firewalld - dynamic firewall daemon.
3.2、关闭防火墙
# systemctl stop firewalld
3.3、关闭后查看状态
# systemctl status firewalld
● firewalld.service - firewalld - dynamic firewall daemon
Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled)
Active: inactive (dead)
Docs: man:firewalld(1)
Jan 01 17:05:47 iZuf65lq1u9ra1ohnf5kebZ systemd[1]: Starting firewalld - dynamic firewall daemon...
Jan 01 17:05:47 iZuf65lq1u9ra1ohnf5kebZ systemd[1]: Started firewalld - dynamic firewall daemon.
Jan 01 17:11:58 iZuf65lq1u9ra1ohnf5kebZ systemd[1]: Stopping firewalld - dynamic firewall daemon...
Jan 01 17:11:58 iZuf65lq1u9ra1ohnf5kebZ systemd[1]: Stopped firewalld - dynamic firewall daemon.
3.4、关闭防火墙开机自启动
# systemctl disable firewalld.service
3.5、关闭防火墙开机自启动后查看防火墙状态
# systemctl status firewalld
● firewalld.service - firewalld - dynamic firewall daemon
Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; vendor preset: enabled)
Active: inactive (dead)
Docs: man:firewalld(1)
Jan 01 17:05:47 iZuf65lq1u9ra1ohnf5kebZ systemd[1]: Starting firewalld - dynamic firewall daemon...
Jan 01 17:05:47 iZuf65lq1u9ra1ohnf5kebZ systemd[1]: Started firewalld - dynamic firewall daemon.
Jan 01 17:11:58 iZuf65lq1u9ra1ohnf5kebZ systemd[1]: Stopping firewalld - dynamic firewall daemon...
Jan 01 17:11:58 iZuf65lq1u9ra1ohnf5kebZ systemd[1]: Stopped firewalld - dynamic firewall daemon.
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文档编号：E20200101-1
文档标签：Centos、防火墙、firewall、SELinux
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