Question

How can i swapout iptables and replace with aws cli command to register and deregister the instances.

As i was following https://www.digitalocean.com/community/tutorials/how-to-migrate-iptables-firewall-rules-to-a-new-server. I have a requirement like suppose i have a ALB contains 2 targets. primary and secondary. Always ALB connected to primary when primary go down ALB routes requests to secondary (acts as stand by).For this i have health check bash script which runs every second as long as primary is healthy ALB routes requests to it. When primary becomes unhealthy ALB routes traffic to secondary. In my health check script i am using iptables to block port on primary when it is unhealthy and unblock port on secondary. i want to swap out all iptables replace with aws cli commands to register and deregister the target. how can write code in bash script to achieve this.


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Hello,

What you could do is use the steps from this tutorial here on how to flush all rules and delete all chains:

https://www.digitalocean.com/community/tutorials/how-to-list-and-delete-iptables-firewall-rules#flushing-all-chains

Then once this is done you could use the iptables-restore < /tmp/iptables-export command to restore the exact rules that you would like to have.

That way you would make sure that the server does not have any rules in place before you restore the ones that you need.

Hope that this helps!

Regards,

Bobby