【E20200101-1】Centos 7.x 关闭防火墙（firewall）和SELinux

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.

Eword 原创学习笔记
文档编号：E20200101-1
文档标签：Centos、防火墙、firewall、SELinux
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