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1.3. 配置 iptables 防火墙允许集群组件运行
Red Hat High Availability Add-On 需要为进入的流量启用以下端口：
- TCP：端口 2224、3121、21064
- UDP：端口 5405
- DLM（如果使用附带 clvm/GFS2 的 DLM 锁管理器）：端口 21064
通过执行以下命令，使用
firewalld 守护进程工具启用这些端口。
#firewall-cmd --permanent --add-service=high-availability#firewall-cmd --add-service=high-availability
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