Re: high count h2 idle streams

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Hello,


Am 09.10.2017 um 12:33 schrieb Hajo Locke:
Hello List,

found today an abnormality in my apachestatus for some servers.
There are a lot of "h2  idle, streams" in apachestatus. This looks like this:

14-0 28241 0/41/41 K  0.25 128 1 0.0 0.10 0.10  ip.ip.ip.ip h2 idle, streams: 0/0/0/0/0 (open/recv/resp/push/rst) 15-0 28242 0/11/11 K  0.25 120 1 0.0 0.61 0.61  ip.ip.ip.ip h2 idle, streams: 0/0/0/0/0 (open/recv/resp/push/rst) 16-0 28243 0/15/15 K  0.22 8 1 0.0 0.39 0.39  ip.ip.ip.ip h2 idle, streams: 0/0/0/0/0 (open/recv/resp/push/rst) 17-0 28245 0/25/25 K  0.40 278 1 0.0 1.13 1.13  ip.ip.ip.ip h2 idle, streams: 0/0/0/0/0 (open/recv/resp/push/rst) 18-0 28246 0/46/46 K  0.52 35 54 0.0 1.53 1.53  ip.ip.ip.ip h2 idle, streams: 0/0/0/0/0 (open/recv/resp/push/rst) 19-0 28250 0/7/7 K  0.12 58 0 0.0 0.02 0.02  ip.ip.ip.ip h2  idle, streams: 0/0/0/0/0 (open/recv/resp/push/rst) 20-0 28277 0/3/3 K  0.24 243 66 0.0 0.23 0.23  ip.ip.ip.ip h2 idle, streams: 0/0/0/0/0 (open/recv/resp/push/rst) 21-0 28278 0/8/8 K  0.15 102 1 0.0 0.29 0.29  ip.ip.ip.ip h2 idle, streams: 0/0/0/0/0 (open/recv/resp/push/rst) 22-0 28280 0/5/5 K  0.12 18 1 0.0 0.31 0.31  ip.ip.ip.ip h2  idle, streams: 0/0/0/0/0 (open/recv/resp/push/rst)

Some servers have hundreds of this, never noticed this before.
This connections have status K or W. Ist this a kind of attack to reach MaxRequestWorkers? It seems the number of this connections can be reduced by reducing H2MaxWorkerIdleSeconds to a lower value.
Apacheversion is 2.4.27.
What should i do now?
it seems that i found problem. it looks like standard-dos with slowloris. i think i just was confused by mod_http2 output. deactivating http2 just shows same problem with http1.1
mod_qos is a really good helper for this kind of problems.

Thanks,
Hajo

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