Remove Web Application Proxy Server From Cluster May 2026

Tonight was the night. I had a change ticket: CHG-0421 – Remove wap-03 from cluster and decommission.

The remaining two WAPs ( wap-01 and wap-02 ) recalculated their session tables. CPU usage on wap-01 jumped from 18% to 32%. Well within limits. Memory stable. Error rate on the payment API… held steady at 0.01% (baseline noise).

A cluster is only as strong as its weakest node. Redundancy isn't about keeping every machine breathing; it's about keeping the right machines healthy. Sometimes, removing a server isn't a loss of capacity—it's an amputation of a chronic disease. remove web application proxy server from cluster

"Removed a bad actor from the team," I said, sipping my cold brew.

But here's the terrifying part. Because wap-03 was "alive" according to basic ICMP pings, the cluster's consensus protocol had been treating it as a voting member. For six months, every time wap-03 choked on a null byte, it would delay the cluster's session replication by 400ms. Tonight was the night

The business didn't see 0.5%. They saw "99.95% uptime." But I saw the angry tweets. I saw the support tickets: "Card declined. Please try again." Those weren't bank declines. Those were wap-03 swallowing the requests whole.

"Yes. Also, we have a rogue monitoring script you should know about." CPU usage on wap-01 jumped from 18% to 32%

I pulled the plug on wap-03 at 2:53 AM.