Error: "ERRO[0000] Invalid Prometheus URL" - URL actually valid

[jurij]

Hi,

I have problems starting a fresh downloaded binary of prometheus.
I think there is an Issue with govalidator.IsURL(cfg.prometheusURL). Which is returning false on a valid URL http://juRiii-NB:9090/. For now, Im starting prometheus with ./prometheus -web.external-url=localhost:9090. See below.

juriii@juRiii-NB ~/dev/prometheus $ ls
console_libraries  consoles  data  prometheus  prometheus.yml  promtool
juriii@juRiii-NB ~/dev/prometheus $ cat prometheus.yml 
global:
  scrape_interval:     15s # By default, scrape targets every 15 seconds.

  # Attach these labels to any time series or alerts when communicating with
  # external systems (federation, remote storage, Alertmanager).
  external_labels:
    monitor: 'codelab-monitor'

# A scrape configuration containing exactly one endpoint to scrape:
# Here it's Prometheus itself.
scrape_configs:
  # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
  - job_name: 'prometheus'

    # Override the global default and scrape targets from this job every 5 seconds.
    scrape_interval: 5s

    target_groups:
      - targets: ['localhost:9090']
juriii@juRiii-NB ~/dev/prometheus $ ./prometheus
ERRO[0000] Invalid Prometheus URL: http://juRiii-NB:9090/  source=main.go:65
juriii@juRiii-NB ~/dev/prometheus $ ping juRiii-NB
PING juRiii-NB (127.0.1.1) 56(84) bytes of data.
64 bytes from juRiii-NB (127.0.1.1): icmp_seq=1 ttl=64 time=0.072 ms
64 bytes from juRiii-NB (127.0.1.1): icmp_seq=2 ttl=64 time=0.056 ms
64 bytes from juRiii-NB (127.0.1.1): icmp_seq=3 ttl=64 time=0.063 ms
^C
--- juRiii-NB ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 1998ms
rtt min/avg/max/mdev = 0.056/0.063/0.072/0.011 ms
juriii@juRiii-NB ~/dev/prometheus $ ./prometheus -web.external-url=localhost:9090
prometheus, version 0.17.0 (branch: release-0.17, revision: e11fab3)
  build user:       fabianreinartz@macpro
  build date:       20160302-17:48:43
  go version:       1.5.3
INFO[0000] Loading configuration file prometheus.yml     source=main.go:202
INFO[0000] Loading series map and head chunks...         source=storage.go:299
INFO[0000] 351 series loaded.                            source=storage.go:304
WARN[0000] No AlertManager configured, not dispatching any alerts  source=notification.go:165
INFO[0000] Starting target manager...                    source=targetmanager.go:114
INFO[0000] Target manager started.                       source=targetmanager.go:168
INFO[0000] Listening on :9090                            source=web.go:239

[grobie]

Hostnames are case insensitive. What is the requirement to set juRiii-NB instead of juriii-nb?

[jurij]

juRiii-NB is my hostname. so the behavior is expected?

[grobie]

No, but it seems to be an edge case. I think your problem is already reported in govalidator in asaskevich/govalidator#117.

I'd suggest to let them know that this affects you as well and lowercase your hostname until then. Something like ./prometheus -web.external-url=http://$(hostname | tr A-Z a-z):9090.

[beorn7]

I'll declare this a dup of asaskevich/govalidator#117 then. Thanks for reporting and investigating.

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.