关于Linux6/7系关闭SElinux和防火墙，配置网络IP地址

关闭SElinux

什么是SElinux？
SELinux(Security-Enhanced Linux) 是美国国家安全局（NSA）对于强制访问控制的实现，是 Linux历史上最杰出的新安全子系统。
笼统来说，就是我的电脑我做主，默认关闭。

1.getenforce命令查看SELinux状态，显示enforcing表示SElinux未关闭。

[root@localhost ~]# getenforce
Enforcing

2.setenforce 0命令关闭SELinux，显示permissive表示SElinux关闭。

[root@localhost ~]# setenforce 0
[root@localhost ~]# getenforce
Permissive

3.关闭SELinux自启动，编辑vim /etc/selinux/config，将SELINUX=enforcing修改成SELINUX=disabled，保存退出wq！

# 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.
SELINUX=disabled
# SELINUXTYPE= can take one of three two values:
#     targeted - Targeted processes are protected,
#     minimum - Modification of targeted policy. Only selected processes are protected. 
#     mls - Multi Level Security protection.
SELINUXTYPE=targeted

4 getenforce命令查看SELinux状态，显示Disabled表示SElinux关闭。

[root@localhost ~]# getenforce
Disabled

关闭防火墙

如果不去关闭防火墙，对外部链接用限制，同样，我的电脑我做主
6系、7系关闭指令不同
1.查看防火墙状态

[root@localhost ~]# service iptables status \\6系
[root@localhost ~]# systemctl status firewalld \\7系

2.关闭防火墙

[root@localhost ~]# service iptables stop \\6系
[root@localhost ~]# systemctl stop firewalld \\7系

3.关闭防火墙自启

[root@localhost ~]# chkconfig iptables off \\6系
[root@localhost ~]# systemctl disable firewalld \\7系

配置网络

1.查看网卡

[root@localhost ~]# ifconfig   ///显示内容为网卡信息

2.打开cd /etc/sysconfig/network_scripts，查看文件ls

[root@localhost ~]# cd /etc/sysconfig/network-scripts/
[root@localhost network-scripts]# ls   

3.编辑vim （根据自己的网卡名来），添加IPADDR=IP地址，NETMASK=子网掩码，GATEWAY=网关，将ONBOOT=no改为yes，BOOTPROTO=dhcp改为static，其他内容不用改，保存退出wq！

[root@localhost network-scripts]# vim ifcfg-ens192

BOOTPROTO="static"
ONBOOT="yes"
IPADDR="192.168.X.XXX"
NETMASK="255.255.255.0"
GATEWAY="192.168.X.1"
DNS1="8.8.8.8"

4.重启网络service network restart

[root@localhost network-scripts]# service network restart 
Restarting network (via systemctl):                        [  OK  ]

5.ping网关是否连通

[root@localhost network-scripts]# ping 192.168.X.1
PING 192.168.X.1 (192.168.X.1) 56(84) bytes of data.
64 bytes from 192.168.X.1: icmp_seq=1 ttl=255 time=1.16 ms
64 bytes from 192.168.X.1: icmp_seq=2 ttl=255 time=2.11 ms
64 bytes from 192.168.X.1: icmp_seq=3 ttl=255 time=1.18 ms
64 bytes from 192.168.X.1: icmp_seq=4 ttl=255 time=1.31 ms

本身也是在学习过程中，记下一笔，希望能有所帮助