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firewall-cmd --add-port=<port>/udp --permanent    # ¿ªÆôudp¶Ë¿Ú
firewall-cmd --remove-port=<port>/tcp --permanent # ¹Ø±Õtcp¶Ë¿Ú
firewall-cmd --remove-port=<port>/udp --permanent # ¹Ø±Õudp¶Ë¿Ú

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firewall-cmd --add-source=<IP/mask> --permanent   # Ìí¼ÓÔÊÐíµÄIP»òIP¶Î
firewall-cmd --remove-source=<IP/mask> --permanent# ÒƳýÔÊÐíµÄIP»òIP¶Î

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firewall-cmd --remove-service=<service> --permanent # ¾Ü¾øЧÀÍͨ¹ý

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https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-using-firewalld-on-centos-7

https://www.vultr.com/docs/configure-iptables-on-centos-7

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