curl: (52) Empty reply from server when I curl prometheus

[szediktam]

Proposal

**Use case. **

Bug Report

What did you do?
I curl prometheus with a error sometimes.

curl http://x.x.x.x:9090/api/v1/query?query=node_cpu

curl: (52) Empty reply from server

sometime it is ok.

What did you expect to see?
normal output of metric

What did you see instead? Under which circumstances?

curl http://x.x.x.x:9090/api/v1/query?query=node_cpu

curl: (52) Empty reply from server

Environment

• System information:

Linux node-1 3.10.0-693.el7.x86_64 #1 SMP Tue Aug 22 21:09:27 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

• Prometheus version:

prometheus, version 2.2.1 (branch: HEAD, revision: bc6058c)
build user: root@149e5b3f0829
build date: 20180314-14:15:45
go version: go1.10

[szediktam]

I also use prometheus/client_golang to get query by QueryRange in client_golang/api/v1/api.
It still a error:
http://x.x.x.x:9090/api/v1/query_range?end=2019-02-22T11%3A51%3A09Z&query=node_cpu&start=2019-02-22T11%3A43%3A09Z&step=120.000: EOF

[simonpasquier]

Check with wireshark or tcpdump but it looks like the connection gets dropped at the TCP level either from the client or from the server. But it doesn't seem to be a problem specific to Prometheus.

I'm closing it for now. If you have further questions, please use our user mailing list, which you can also search.