CentOS7

[root@localhost ~]# cat /etc/redhat-release
CentOS Linux release 7.2.1511 (Core)

1.关闭firewall

[root@localhost ~]# systemctl stop firewalld.service            //停止firewall
[root@localhost ~]# systemctl disable firewalld.service        //禁止firewall开机启动

2.安装iptables

[root@localhost ~]# yum install iptables-services            //安装

[root@localhost ~]# systemctl restart iptables.service #重启防火墙使配置生效

[root@localhost ~]# systemctl enable iptables.service #设置防火墙开机启动

[root@localhost ~]# systemctl disable iptables.service #禁止防火墙开机启动

CentOS6

[root@localhost ~]# service iptable status      ---查看防火墙状态

[root@localhost ~]#servcie iptables stop           --临时关闭防火墙

[root@localhost ~]#service iptables start          --临时启动防火墙

[root@localhost ~]#service iptables restart          --重启防火墙

[root@localhost ~]#chkconfig iptables off          --永久关闭防火墙

[root@localhost ~]#chkconfig iptables on          --永久开启防火墙

查看当前状态

[root@xuegod63 ~]# systemctl status firewalld.service    #查看firewalld状态

[root@xuegod63 ~]# systemctl stop firewalld       #关闭

[root@xuegod63 ~]# systemctl start firewalld       #开启

[root@xuegod63 ~]# systemctl disable firewalld     #开机自动关闭   //RHLE7

[root@xuegod63 ~]# chkconfig --list|grep network    #查看开机是否启动   //RHLE6

[root@xuegod63 ~]# systemctl enable firewalld     #开机自动启动

2.3  临时和永久关闭Selinux

临时关闭

[root@xuegod63~]# getenforce

Enforcing

[root@xuegod63~]# setenforce 0

setenforce:SELinux is disabled

永久关闭

[root@xuegod63 ~]# vim /etc/selinux/config  

改：7SELINUX=enforcing     #前面的7，表示文档中第7行。方便你查找

为：7SELINUX=disabled

[root@xuegod63 ~]# reboot

2.4  设置系统光盘开机自动挂载

[root@xuegod63~]# vim  /etc/fstab  #在文档最后，添加以一下红色内容：

/dev/cdrom                     /mnt                    iso9660 defaults        0 0

[root@xuegod63~]# mount -a

mount:/dev/sr0 写保护，将以只读方式挂载

[root@xuegod63~]# ls /mnt/   #可以查看到此目录下有内容，说明挂载成功

CentOS_BuildTag  GPL      LiveOS    RPM-GPG-KEY-CentOS-7

1.查看防火墙状态

root# service iptables status

root# service iptables stop

root# chkconfig --del iptables

root# iptables -L -n