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WIP: configure alertmanager HA cluster mode for sts #460

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WIP: configure alertmanager HA cluster mode for sts #460

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2 changes: 1 addition & 1 deletion ci/test-deployment-values.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -128,7 +128,7 @@ runtimeconfigmap:
annotations:
foo: bar
alertmanager:
replicas: 1
replicas: 3
statefulSet:
enabled: false
extraVolumes:
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2 changes: 1 addition & 1 deletion ci/test-sts-values.yaml
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Expand Up @@ -119,7 +119,7 @@ runtimeconfigmap:
annotations:
foo: bar
alertmanager:
replicas: 1
replicas: 3
statefulSet:
enabled: true
extraVolumes:
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169 changes: 0 additions & 169 deletions templates/alertmanager/alertmanager-dep.yaml
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17 changes: 17 additions & 0 deletions templates/alertmanager/alertmanager-statefulset.yaml
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Original file line number Diff line number Diff line change
@@ -1,3 +1,5 @@
{{- $svcClusterAddress := ((.Values.config.alertmanager.cluster).listen_address) | default "0.0.0.0:9094" }}
{{- $svcClusterPort := (split ":" $svcClusterAddress)._1 }}
{{- if .Values.alertmanager.enabled -}}
{{- if .Values.alertmanager.statefulSet.enabled -}}
apiVersion: apps/v1
Expand Down Expand Up @@ -152,6 +154,12 @@ spec:
args:
- "-target=alertmanager"
- "-config.file=/etc/cortex/cortex.yaml"
{{- if gt (int .Values.alertmanager.replicas) 1}}
{{- $fullName := include "cortex.alertmanagerFullname" . }}
{{- range $i := until (int .Values.alertmanager.replicas) }}
- "-alertmanager.cluster.peers={{ $fullName }}-{{ $i }}.{{ $fullName }}-headless.{{ $.Release.Namespace }}.svc.cluster.local:{{ $svcClusterPort }}"
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Not sure if this even technically correct. Since according to the documentation this is supposed to be comma seperated list which is different from alertmanager configuration where you have to repeat the flag for each peer.

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@humblebundledore humblebundledore Jun 28, 2023 •
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Not sure if this even technically correct. Since according to the documentation this is supposed to be comma seperated list which is different from alertmanager configuration where you have to repeat the flag for each peer.

I see you are referencing L88

	AlertmanagerClusterFlags = func(peers string) map[string]string {
		return map[string]string{
			"-alertmanager.cluster.listen-address": "0.0.0.0:9094", // This is the default, but let's be explicit.
			"-alertmanager.cluster.peers":          peers,
			"-alertmanager.cluster.peer-timeout":   "2s",
		}
	}

but @nschad where do you see that the flag need to be repeated for each peer ?

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alertmanager.cluster.peers

I don't that why I said it should be single string and comma separated (Doc: https://cortexmetrics.io/docs/configuration/configuration-file/)

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alertmanager.cluster.peers

I don't that why I said it should be single string and comma separated (Doc: https://cortexmetrics.io/docs/configuration/configuration-file/)

I misunderstood your message so, sorry.

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I have a commit waiting to be pushed to this branch to change to a comma separated peers :

commit 9c245d488cc916df1e76be1afb66a593dabccdd8 (HEAD -> feature/alertmanager-cluster)
Author: AlexandreRoux <[email protected]>
Date:   Thu Jun 29 17:28:18 2023 +0200

    configure alertmanager cluster peers as comma seperated list

    Signed-off-by: AlexandreRoux <[email protected]>

diff --git a/templates/alertmanager/alertmanager-statefulset.yaml b/templates/alertmanager/alertmanager-statefulset.yaml
index 41b592b..b5d5043 100644
--- a/templates/alertmanager/alertmanager-statefulset.yaml
+++ b/templates/alertmanager/alertmanager-statefulset.yaml
@@ -156,9 +156,12 @@ spec:
             - "-config.file=/etc/cortex/cortex.yaml"
             {{- if gt (int .Values.alertmanager.replicas) 1}}
             {{- $fullName := include "cortex.alertmanagerFullname" . }}
+            {{- $peers := list }}
             {{- range $i := until (int .Values.alertmanager.replicas) }}
-            - "-alertmanager.cluster.peers={{ $fullName }}-{{ $i }}.{{ $fullName }}-headless.{{ $.Release.Namespace }}.svc.cluster.local:{{ $svcClusterPort }}"
+             {{- $peer := printf "%s-%d.%s-headless.%s.svc.cluster.local:%s" $fullName $i $fullName $.Release.Namespace $svcClusterPort }}
+              {{- $peers = append $peers $peer }}
             {{- end }}
+            - "-alertmanager.cluster.peers={{ join "," $peers }}"
             {{- end }}
             {{- range $key, $value := .Values.alertmanager.extraArgs }}
             - "-{{ $key }}={{ $value }}"

but it seems I have no access to push to the branch, is this expected @nschad ?

Is there any preferred way to get it here (then I will merge this upstream / branch to my code in #435.

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Uh I don't know if I can enable this after the fact. I can close this PR and you can just edit your PR #435?

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Uh I don't know if I can enable this after the fact. I can close this PR and you can just edit your PR #435?

sounds good !

{{- end }}
{{- end }}
{{- range $key, $value := .Values.alertmanager.extraArgs }}
- "-{{ $key }}={{ $value }}"
{{- end }}
Expand All @@ -175,6 +183,15 @@ spec:
- name: gossip
containerPort: {{ .Values.config.memberlist.bind_port }}
protocol: TCP
- name: grpc
containerPort: {{ .Values.config.server.grpc_listen_port }}
protocol: TCP
- containerPort: {{ $svcClusterPort }}
name: alert-clu-tcp
protocol: TCP
- containerPort: {{ $svcClusterPort }}
name: alert-clu-udp
protocol: UDP
startupProbe:
{{- toYaml .Values.alertmanager.startupProbe | nindent 12 }}
livenessProbe:
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8 changes: 8 additions & 0 deletions templates/alertmanager/alertmanager-svc-headless.yaml
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Expand Up @@ -21,6 +21,14 @@ spec:
protocol: TCP
name: http-metrics
targetPort: http-metrics
- port: 9094
protocol: UDP
name: alert-clu-udp
targetPort: alert-clu-udp
- port: 9094
protocol: TCP
name: alert-clu-tcp
targetPort: alert-clu-tcp
selector:
{{- include "cortex.alertmanagerSelectorLabels" . | nindent 4 }}
{{- end -}}
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