Linux入門-Centos7防火牆

前言

從Centos6升級到Centos7，防火牆命令變化了，但是還是習慣以前的iptables命令。本文記錄如何開啟iptables規則的防火牆。

1.Centos7自帶防火牆關閉

• 查看防火牆狀態

<code># firewall-cmd --state

not running/<code>

• 停止firewall

<code># systemctl stop firewalld.service/<code>

• 禁止firewall開機啟動

<code># systemctl disable firewalld.service/<code>

2.安裝配置iptables

• 安裝

<code># yum install -y iptables-services/<code>

• 編輯防火牆配置文件

這個是默認規則

<code># vim /etc/sysconfig/iptables

# sample configuration for iptables service
# you can edit this manually or use system-config-firewall
# please do not ask us to add additional ports/services to this default configuration
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT/<code>

修改規則保存退出

• 重啟防火牆

<code># systemctl restart iptables.service      #最後重啟防火牆使配置生效/<code>

3.其他命令

<code># 設置防火牆開機啟動
# systemctl enable iptables.service     
# 禁止iptables服務
# systemctl disable iptables     
# 暫停服務
# systemctl stop iptables         
# 解除禁止iptables
# systemctl enable iptables     
# 開啟服務
# systemctl start iptables         /<code>