How do I customize alertmanager.yaml

[jiangxianliang007]

I use kubectl patch secret update alertmanager.yaml, but it does not work.
kubectl patch secret alertmanager-main-generated -n monitoring -p='{"data":{"alertmanager.yaml": "Imdsb2JhbCI6CiAgInJlc29sdmVfdGltZW91dCI6ICI1bSIKICAic210cF9zbWFydGhvc3QiOiAnc210cC4xNjMuY29tOjQ2NScKICAic210"}}'

I deleted alertmanager-main-generated first, then created it, but it already exists because alertmanager-alertmanager.yaml automatically creates the default alertmanager-main-generated secret

kubectl delete secret alertmanager-main-generated -n monitoring
kubectl create secret generic alertmanager-main-generated --from-file=alertmanager.yaml -n monitoring
secret "alertmanager-main-generated" deleted
Error from server (AlreadyExists): secrets "alertmanager-main-generated" already exists

How do I customize alertmanager.yaml？

[olegmayko]

if you use jsonnet to generate manifests you may have a look at this example

[jiangxianliang007]

jsonnet
If you don't use jsonnet, is there any other way to remove the default alertmanager-main-generated?

[shinebayar-g]

I also can't find any reference of what is using alertmanager-main secret. AFAIK there is no reference in manifests. Does prometheus-operator itself expects the secret by default?

Found it: https://github.com/prometheus-operator/prometheus-operator/blob/master/Documentation/user-guides/alerting.md#manually-managed-secret

You should edit alertmanager-main secret. Not -generated one.

[okhuz]

I am also confused about that I am creating the manifest and in the CRD configSecret states that it defaults to alertmanater-{name} but it still is trying to mount the -generated one? What am I missing there?

[paulfantom]

alertmanager-{name} secret is picked up by prometheus-operator which then creates alertmanager-{name}-generated secret that is mounted in alertmanager pods.

[okhuz]

It was not generating from the secret that I have created actually. I needed to edit the statefulset in order to get configuration from alertmanager-{name}. Now everything is working as expected. If that is the way config maps intended to work, I haven't been able to configure it that way.