CentOS7默认的防火墙不是iptables,而是firewalle.
安装iptable iptable-service
- 1.先检查是否安装了iptables
service iptables status - 2.安装iptables
yum install -y iptables - 3.升级iptables
yum update iptables - 4.安装iptables-services
yum install iptables-services
禁用/停止自带的firewalld服务
- 1.停止firewalld服务
systemctl stop firewalld - 2.禁用firewalld服务
systemctl mask firewalld
开启iptables服务
# 注册iptables服务
# 相当于以前的chkconfig iptables on
systemctl enable iptables.service
# 开启服务
systemctl start iptables.service
# 查看状态
systemctl status iptables.service
解决vsftpd在iptables开启后,无法使用被动模式的问题
在/etc/sysconfig/iptables-config中修改或者添加以下内容,注意顺序不能调换
IPTABLES_MODULES="ip_conntrack_ftp"
IPTABLES_MODULES="ip_nat_ftp"
命令行配置
#!/bin/bash
iptables -P INPUT ACCEPT
iptables -F
iptables -X
iptables -Z
iptables -A INPUT -i lo -j ACCEPT
iptables -A INPUT -p tcp --dport 22 -j ACCEPT
iptables -A INPUT -p tcp --dport 21 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j ACCEPT
iptables -A INPUT -p icmp --icmp-type 8 -j ACCEPT
iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -P INPUT DROP
iptables -P OUTPUT ACCEPT
iptables -P FORWARD DROP
service iptables save
systemctl restart iptables.service
备注：存放目录/etc/sysconfig/iptables
编辑配置
vim /etc/sysconfig/iptables
# Generated by iptables-save v1.4.7 on Sat Mar 18 11:09:29 2017
*filter
:INPUT DROP [0:0]
:FORWARD DROP [0:0]
:OUTPUT ACCEPT [10:1080]
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m tcp --dport 22 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 21 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 80 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 443 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 8080 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 3000 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 8000 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 53 -j ACCEPT
-A INPUT -m state --state NEW -m udp -p udp --dport 53 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 953 -j ACCEPT
-A INPUT -p icmp -m icmp --icmp-type 8 -j ACCEPT
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
COMMIT
# Completed on Sat Mar 18 11:09:29 2017
查看防火墙端口
iptables -L -n
[root@iz2ze99vyqnhv3rv6rztafz ~]# iptables -L -n
Chain INPUT (policy DROP)
target prot opt source destination
ACCEPT all -- 0.0.0.0/0 0.0.0.0/0
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:22
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:21
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:80
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:8080
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:3306
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:443
ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmptype 8
ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
Chain FORWARD (policy DROP)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
[root@iz2ze99vyqnhv3rv6rztafz ~]#
