Hey, Late last night, I got a call that one of our servers was down. Turns out the machine had all 2500 connection slots in use, but none of them appeared to be doing anything: hardly any CPU was being used, load 0.05, and tcpdump confirmed that pretty much no data was being sent, either.
Disks were writeable - so not hanging write flood - and when I eventually sent a kill, the daemon did a clean shutdown and came back up without a hitch. Unfortunately I couldn't log in while this was going on because I never configured a few extra connections for super - that's been fixed by now. Munin shows no discernable cause, no ramp-up on the load or whatever on either the DB or the webservers; just a very sudden increase in open connections and an equally sudden drop in network traffic. Neither slowlog nor sys/errorlog shows anything out of the ordinary. I can think of only two causes: bug in the app code, or bug in MySQL. This is 5.0.32-Debian_7etch3-log (Debian package) on Debian Etch, running on x86_64. Does anyone know of similar things happening ? -- Bier met grenadyn Is als mosterd by den wyn Sy die't drinkt, is eene kwezel Hy die't drinkt, is ras een ezel
