True Zero Downtime HAProxy Reloads

Created: 2023-02-05T17:29:09-06:00

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• Create a "plug" qdisc queue in Linux.
• Create an iptables rule to route all TCP SYN requests to the queue.
• Plug the queue when you are about to do a reload; incoming requests will now back up in memory.
• Reload your daemon.
• Unplug the queue and incoming requests will begin processing immediately.