1. Linux系统：Red Hat Enterprise Linux Server release 6.5 (Santiago)
临时关闭防火墙命令：
service iptables stop
service ip6tables stop
永久关闭防火墙命令：
chkconfig iptables off
chkconfig ip6tables off
查看防火墙状态命令：
service iptables status
[root@hadoop ~]# cat /etc/redhat-release
Red Hat Enterprise Linux Server release6.5(Santiago)
[root@hadoop~]# service iptables stop
iptables: Setting chains to policy ACCEPT: filter [ OK ]
iptables: Flushing firewall rules: [ OK ]
iptables: Unloading modules: [ OK ]
[root@hadoop~]# service ip6tables stop
ip6tables: Setting chains to policy ACCEPT: filter [ OK ]
ip6tables: Flushing firewall rules: [ OK ]
ip6tables: Unloading modules: [ OK ]
[root@hadoop~]# service iptables status
iptables: Firewallisnot running.
[root@hadoop~]# service ip6tables status
ip6tables: Firewallisnot running.
[root@hadoop~]# chkconfig iptables off
[root@hadoop~]# chkconfig ip6tables off
2. linux系统：CentOS Linux release 7.5.1804 (Core)
前面说的几个命令，我在centos 7上用着都失效了。网上说，centos从7开始默认用的是firewalld，这个是基于iptables的，虽然有iptables的核心，但是iptables的服务是没安装的。所以你只要停止firewalld服务即可
[root@hadoop ~]# sudo systemctl stop firewalld.service &&sudo systemctl disable firewalld.service
Removed symlink/etc/systemd/system/multi-user.target.wants/firewalld.service.
Removed symlink/etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
如果你要改用iptables的话，需要安装iptables服务，并对命令做一些修改
[root@hadoop ~]# service iptables stop #命令失效
Redirecting to/bin/systemctl stop iptables.service
Failed to stop iptables.service: Unit iptables.service not loaded.
[root@hadoop~]# yum install iptables-services
[root@hadoop~]# /bin/systemctl stop iptables.service
[root@hadoop~]# /bin/systemctl stop ip6tables.service
永久关闭防火墙
[root@hadoop ~]# chkconfig iptables off #命令失效
Note: Forwarding request to’systemctl disable iptables.service’.
[root@hadoop~]# systemctl disable iptables.service
[root@hadoop~]# systemctl disable ip6tables.service
查看防火墙是否关闭
[root@hadoop ~]# firewall-cmd –state
not running
总结：centos 7系统关闭防火墙有2种方式：
方式1：
关闭防火墙：systemctl stop firewalld.service
永久关闭防火墙：systemctl disable firewalld.service
方式2：
首先安装iptables服务：yum install iptables-services
关闭防火墙：/bin/systemctl stop iptables.service && /bin/systemctl stop ip6tables.service
永久关闭防火墙：systemctl disable iptables.service && systemctl disable ip6tables.service
查看防火墙是否关闭：firewall-cmd –state
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