CentOS 7.0默认使用的是firewall作为防火墙
查看防火墙状态
firewall-cmd --state
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停止firewall
systemctl stop firewalld.service
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禁止firewall开机启动
systemctl disable firewalld.service
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关闭selinux 进入到/etc/selinux/config文件
vi /etc/selinux/config
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将SELINUX=enforcing改为SELINUX=disabled
https://blog.csdn.net/ytangdigl/article/details/79796961