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PromCon Online
Julien Pivotto
@roidelapluie
5 tips to better use
Prometheus Service Discovery
July 15th, 2020
• Used to discover targets
• Listens to events from target (e.g. consul)
• Queries targets at a certain interval (e.g. DNS)
Service Discovery in Prometheus
@roidelapluie
scrape_configs:
- job_name: node
digitalocean_sd_configs:
- bearer_token: "<replace with a Personal Access Token>"
relabel_configs:
- source_labels: [__meta_digitalocean_tags]
regex: '.*,monitoring,.*'
action: keep
- source_labels: [__meta_digitalocean_public_ipv6]
target_label: __address__
replacement: '[$1]:9100'
Classic pattern: Service discovery + Relabel con g.
Relabel con g = Change labels found by SD to alert scrape con g.
Classic exemple
@roidelapluie
alerting:
alertmanagers:
digitalocean_sd_configs:
- bearer_token: "<replace with a Personal Access Token>"
relabel_configs:
- source_labels: [__meta_digitalocean_tags]
regex: '.*,monitoring,.*'
action: keep
Automatically discover alertmanager instances.
Tip 1: Alerting uses service discovery
@roidelapluie
scrape_configs:
- job_name: node
digitalocean_sd_configs:
- bearer_token: "<Personal Access Token1>"
- bearer_token: "<Personal Access Token2>"
- bearer_token: "<Personal Access Token3>"
relabel_configs:
- source_labels: [__meta_digitalocean_tags]
regex: '.*,monitoring,.*'
action: keep
- source_labels: [__meta_digitalocean_public_ipv6]
target_label: __address__
replacement: '[$1]:9100'
You can use multiple sources in one job.
Tip 2: SD con gs are lists
@roidelapluie
scrape_configs:
- job_name: node
static_configs:
- targets: [127.0.0.1:9090]
gce_sd_configs:
- zone: europe-west1-b
project: myproject
digitalocean_sd_configs:
- bearer_token: "<Personal Access Token1>"
- bearer_token: "<Personal Access Token2>"
You can use multiple kinds of SD for one job.
Tip 3: Multiple SD for one job
@roidelapluie
- job_name: node
digitalocean_sd_configs:
- bearer_token: "<Personal Access Token1>"
relabel_configs:
- source_labels: [__meta_digitalocean_private_ipv4]
target_label: __address__
replacement: '[$1]:9100'
- job_name: cadvisor
digitalocean_sd_configs:
- bearer_token: "<Personal Access Token1>"
relabel_configs:
- source_labels: [__meta_digitalocean_private_ipv4]
target_label: __address__
replacement: '[$1]:8080'
Tip 4: Reuse SD for multiple jobs
@roidelapluie
Prometheus will REUSE the same API calls/connection if the SD con g is
exactly identical.
Check in DEBUG logs:
caller=manager.go:226 component="discovery manager scrape" msg="Starting
provider" provider=*digitalocean.SDConfig/0 subs="[node cadvisor]"
Tip 4: Reuse SD for multiple jobs (cont)
@roidelapluie
scrape_configs:
- job_name: node
file_sd_configs:
- files:
- targets.yml
Tip 5: le_sd les can contain con g labels
@roidelapluie
targets.yml:
- labels:
__scheme__: https
__metrics_path__: /metrics2
__param_foo: bar
targets: [localhost:9100]
- labels:
__param_foo: bar2
targets: [localhost:9101]
https://localhost:9100/metrics2?foo=bar
http://localhost:9101/metrics?foo=bar2
Tip 5: le_sd les can contain con g labels (cont)
@roidelapluie
Julien Pivotto
@roidelapluie
roidelapluie@inuits.eu
Essensteenweg 31
2930 Brasschaat
Belgium
Contact:
info@inuits.eu
+32-3-8082105

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5 tips for Prometheus Service Discovery

  • 1. PromCon Online Julien Pivotto @roidelapluie 5 tips to better use Prometheus Service Discovery July 15th, 2020
  • 2. • Used to discover targets • Listens to events from target (e.g. consul) • Queries targets at a certain interval (e.g. DNS) Service Discovery in Prometheus @roidelapluie
  • 3. scrape_configs: - job_name: node digitalocean_sd_configs: - bearer_token: "<replace with a Personal Access Token>" relabel_configs: - source_labels: [__meta_digitalocean_tags] regex: '.*,monitoring,.*' action: keep - source_labels: [__meta_digitalocean_public_ipv6] target_label: __address__ replacement: '[$1]:9100' Classic pattern: Service discovery + Relabel con g. Relabel con g = Change labels found by SD to alert scrape con g. Classic exemple @roidelapluie
  • 4. alerting: alertmanagers: digitalocean_sd_configs: - bearer_token: "<replace with a Personal Access Token>" relabel_configs: - source_labels: [__meta_digitalocean_tags] regex: '.*,monitoring,.*' action: keep Automatically discover alertmanager instances. Tip 1: Alerting uses service discovery @roidelapluie
  • 5. scrape_configs: - job_name: node digitalocean_sd_configs: - bearer_token: "<Personal Access Token1>" - bearer_token: "<Personal Access Token2>" - bearer_token: "<Personal Access Token3>" relabel_configs: - source_labels: [__meta_digitalocean_tags] regex: '.*,monitoring,.*' action: keep - source_labels: [__meta_digitalocean_public_ipv6] target_label: __address__ replacement: '[$1]:9100' You can use multiple sources in one job. Tip 2: SD con gs are lists @roidelapluie
  • 6. scrape_configs: - job_name: node static_configs: - targets: [127.0.0.1:9090] gce_sd_configs: - zone: europe-west1-b project: myproject digitalocean_sd_configs: - bearer_token: "<Personal Access Token1>" - bearer_token: "<Personal Access Token2>" You can use multiple kinds of SD for one job. Tip 3: Multiple SD for one job @roidelapluie
  • 7. - job_name: node digitalocean_sd_configs: - bearer_token: "<Personal Access Token1>" relabel_configs: - source_labels: [__meta_digitalocean_private_ipv4] target_label: __address__ replacement: '[$1]:9100' - job_name: cadvisor digitalocean_sd_configs: - bearer_token: "<Personal Access Token1>" relabel_configs: - source_labels: [__meta_digitalocean_private_ipv4] target_label: __address__ replacement: '[$1]:8080' Tip 4: Reuse SD for multiple jobs @roidelapluie
  • 8. Prometheus will REUSE the same API calls/connection if the SD con g is exactly identical. Check in DEBUG logs: caller=manager.go:226 component="discovery manager scrape" msg="Starting provider" provider=*digitalocean.SDConfig/0 subs="[node cadvisor]" Tip 4: Reuse SD for multiple jobs (cont) @roidelapluie
  • 9. scrape_configs: - job_name: node file_sd_configs: - files: - targets.yml Tip 5: le_sd les can contain con g labels @roidelapluie
  • 10. targets.yml: - labels: __scheme__: https __metrics_path__: /metrics2 __param_foo: bar targets: [localhost:9100] - labels: __param_foo: bar2 targets: [localhost:9101] https://localhost:9100/metrics2?foo=bar http://localhost:9101/metrics?foo=bar2 Tip 5: le_sd les can contain con g labels (cont) @roidelapluie
  • 11. Julien Pivotto @roidelapluie roidelapluie@inuits.eu Essensteenweg 31 2930 Brasschaat Belgium Contact: info@inuits.eu +32-3-8082105