What configmap let's me edit the scrape_configs of the prometheus app on kubernetes

Question

I have installed the one-click app “Prometheus Kubernetes”, with it came an ever so nice stack of software that I am very thankful for, however I have some additional metrics that I would like to be scraped. I am however lost in all of the configmappers that the app installs. I have so far searched the configmaps:

configmap/prometheus-operator-prometheus
configmap/prometheus-prometheus-operator-prometheus-rulefiles-0
configmap/prometheus-operator-prometheus
configmap/prometheus-operator-pod-totoal
configmap/prometheus-operator-pod-total

for the “scrape_configs” string, but could not find any.

Answer 1

RobinDorstijn October 21, 2020

The trick is that this app installs prometheus-operator, which is a separate project. It’s github account provides documentation for the project, in which you can find the description for adding scrape configs.

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cpalmer03 December 25, 2020

Robin,

The documnetation linked says after creating the secrets,

“Finally, reference this additional configuration in your prometheus.yaml CRD.”

When I installed monitoring with one click app, I never had a prometheus.yaml file to begin with to apply? So how would I apply these additionalScrapeConfigs?
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Answer 2

cpalmer03 December 25, 2020

Robin,

The documnetation linked says after creating the secrets,

“Finally, reference this additional configuration in your prometheus.yaml CRD.”

When I installed monitoring with one click app, I never had a prometheus.yaml file to begin with to apply? So how would I apply these additionalScrapeConfigs?
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Answer 3

RobinDorstijn October 21, 2020

Show answer This answer has been marked as resolved by RobinDorstijn.

I made a little bash script in order to search the configmaps:

confs=$(
    kubectl get configmaps -n prometheus-operator |
    grep "prometheus" |
    awk -F " " '{print $1}'
)

for conf_name in $confs
do
    echo "Looking at $conf_name"
    kubectl get -n prometheus-operator configmap/$conf_name -o yaml | grep scrape
done

However this gave no result, so clearly the scrape_configs is in a configmap.

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RobinDorstijn October 21, 2020
For one reason or another, it was chosen to store the config file as a secret: secret/prometheus-prometheus-operator-prometheus. To few it run:

$ k get -n prometheus-operator secret/prometheus-prometheus-operator-prometheus -o json | jq -r '.data["prometheus.yaml.gz"]'| base64 -d | gunzip
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- RobinDorstijn October 21, 2020
  
  But apparently this is not where the change needs to be made, as a config reloader is available. However it is not clear how this reloader can be set with a new config.
  
  Reply Report

Answer 4

RobinDorstijn October 21, 2020
For one reason or another, it was chosen to store the config file as a secret: secret/prometheus-prometheus-operator-prometheus. To few it run:

$ k get -n prometheus-operator secret/prometheus-prometheus-operator-prometheus -o json | jq -r '.data["prometheus.yaml.gz"]'| base64 -d | gunzip
Reply Report
- RobinDorstijn October 21, 2020
  
  But apparently this is not where the change needs to be made, as a config reloader is available. However it is not clear how this reloader can be set with a new config.
  
  Reply Report

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