CentOS7默認(rèn)的防火墻不是iptables,而是firewalle.

安裝iptable iptable-service

• 1.先檢查是否安裝了iptables
  service iptables status
• 2.安裝iptables
  yum install -y iptables
• 3.升級(jí)iptables
  yum update iptables
• 4.安裝iptables-services
  yum install iptables-services

禁用/停止自帶的firewalld服務(wù)

• 1.停止firewalld服務(wù)
  systemctl stop firewalld
• 2.禁用firewalld服務(wù)
  systemctl mask firewalld

開(kāi)啟iptables服務(wù)

# 注冊(cè)iptables服務(wù)
# 相當(dāng)于以前的chkconfig iptables on
systemctl enable iptables.service
# 開(kāi)啟服務(wù)
systemctl start iptables.service
# 查看狀態(tài)
systemctl status iptables.service

解決vsftpd在iptables開(kāi)啟后,無(wú)法使用被動(dòng)模式的問(wèn)題

在/etc/sysconfig/iptables-config中修改或者添加以下內(nèi)容,注意順序不能調(diào)換

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

備注：存放目錄/etc/sysconfig/iptables

編輯配置

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

查看防火墻端口

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 ~]#