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SolusVM Slave - custom iptables

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I want to add some custom lines to /etc/sysconfig/iptables.

I can do this but Solusvm flushes the rules using iptables-save every 5 minutes.

It does not always remove them and they survive a reboot but it seems twice daily it resets them? Most advise seems to be not to worry, but I don't want to have open ports to the node and want to secure ssh port etc.

What would the best way to do this be?

Run my own timed script to add them back just after SolusVM has run its ipt_update script?

thanks for reading.

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