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build memcached into the chart, enabled by default, this commit inclu…
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…des a results cache and chunks cache

Signed-off-by: Edward Welch <[email protected]>
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slim-bean committed Mar 21, 2024
1 parent 138e6f2 commit 227c586
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Showing 9 changed files with 459 additions and 22 deletions.
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{{- if .Values.chunksCache.enabled }}
apiVersion: {{ include "loki.pdb.apiVersion" . }}
kind: PodDisruptionBudget
metadata:
name: {{ include "loki.fullname" . }}-memcached-chunks-cache
namespace: {{ .Release.Namespace }}
labels:
{{- include "loki.selectorLabels" . | nindent 4 }}
app.kubernetes.io/component: memcached-chunks-cache
spec:
selector:
matchLabels:
{{- include "loki.selectorLabels" . | nindent 6 }}
app.kubernetes.io/component: memcached-chunks-cache
maxUnavailable: 1
{{- end -}}
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{{- include "loki.memcached.service" (dict "ctx" $ "valuesSection" "chunksCache" "component" "chunks-cache" ) }}
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{{- include "loki.memcached.statefulSet" (dict "ctx" $ "valuesSection" "chunksCache" "component" "chunks-cache" ) }}
159 changes: 159 additions & 0 deletions production/helm/loki/templates/memcached/_memcached-statefulset.tpl
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{{/*
memcached StatefulSet
Params:
ctx = . context
valuesSection = name of the section in values.yaml
component = name of the component
valuesSection and component are specified separately because helm prefers camelcase for naming convetion and k8s components are named with snake case.
*/}}
{{- define "loki.memcached.statefulSet" -}}
{{ with (index $.ctx.Values $.valuesSection) }}
{{- if .enabled -}}
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: {{ include "loki.resourceName" (dict "ctx" $.ctx "component" $.component) }}
labels:
{{- include "loki.labels" $.ctx | nindent 4 }}
app.kubernetes.io/component: "memcached-{{ $.component }}"
name: "memcached-{{ $.component }}"
annotations:
{{- toYaml .annotations | nindent 4 }}
namespace: {{ $.ctx.Release.Namespace | quote }}
spec:
podManagementPolicy: {{ .podManagementPolicy }}
replicas: {{ .replicas }}
selector:
matchLabels:
{{- include "loki.selectorLabels" $.ctx | nindent 6 }}
app.kubernetes.io/component: "memcached-{{ $.component }}"
name: "memcached-{{ $.component }}"
updateStrategy:
{{- toYaml .statefulStrategy | nindent 4 }}
serviceName: {{ template "loki.fullname" $.ctx }}-{{ $.component }}

template:
metadata:
labels:
{{- include "loki.selectorLabels" $.ctx | nindent 8 }}
app.kubernetes.io/component: "memcached-{{ $.component }}"
name: "memcached-{{ $.component }}"
{{- with $.ctx.Values.loki.podLabels }}
{{- toYaml . | nindent 8 }}
{{- end }}
{{- with .podLabels }}
{{- toYaml . | nindent 8 }}
{{- end }}
annotations:
{{- with $.ctx.Values.global.podAnnotations }}
{{- toYaml . | nindent 8 }}
{{- end }}
{{- with .podAnnotations }}
{{- toYaml . | nindent 8 }}
{{- end }}

spec:
serviceAccountName: {{ template "loki.serviceAccountName" $.ctx }}
{{- if .priorityClassName }}
priorityClassName: {{ .priorityClassName }}
{{- end }}
securityContext:
{{- toYaml $.ctx.Values.memcached.podSecurityContext | nindent 8 }}
initContainers:
{{- toYaml .initContainers | nindent 8 }}
nodeSelector:
{{- toYaml .nodeSelector | nindent 8 }}
affinity:
{{- toYaml .affinity | nindent 8 }}
toplogySpreadConstraints:
{{- toYaml .topologySpreadConstraints | nindent 8 }}
tolerations:
{{- toYaml .tolerations | nindent 8 }}
terminationGracePeriodSeconds: {{ .terminationGracePeriodSeconds }}
{{- if $.ctx.Values.imagePullSecrets }}
imagePullSecrets:
{{- range $.ctx.Values.image.pullSecrets }}
- name: {{ . }}
{{- end }}
{{- end }}
{{- if .extraVolumes }}
volumes:
{{- toYaml .extraVolumes | nindent 8 }}
{{- end }}
containers:
{{- if .extraContainers }}
{{ toYaml .extraContainers | nindent 8 }}
{{- end }}
- name: memcached
{{- with $.ctx.Values.memcached.image }}
image: {{ .repository }}:{{ .tag }}
imagePullPolicy: {{ .pullPolicy }}
{{- end }}
resources:
{{- if .resources }}
{{- toYaml .resources | nindent 12 }}
{{- else }}
{{- /* Calculate requested memory as round(allocatedMemory * 1.2). But with integer built-in operators. */}}
{{- $requestMemory := div (add (mul .allocatedMemory 12) 5) 10 }}
limits:
memory: {{ $requestMemory }}Mi
requests:
cpu: 500m
memory: {{ $requestMemory }}Mi
{{- end }}
ports:
- containerPort: {{ .port }}
name: client
args:
- -m {{ .allocatedMemory }}
- --extended=modern,track_sizes{{ with .extraExtendedOptions }},{{ . }}{{ end }}
- -I {{ .maxItemMemory }}m
- -c {{ .connectionLimit }}
- -v
- -u {{ .port }}
{{- range $key, $value := .extraArgs }}
- "-{{ $key }}{{ if $value }} {{ $value }}{{ end }}"
{{- end }}
env:
{{- with $.ctx.Values.global.extraEnv }}
{{ toYaml . | nindent 12 }}
{{- end }}
envFrom:
{{- with $.ctx.Values.global.extraEnvFrom }}
{{- toYaml . | nindent 12 }}
{{- end }}
securityContext:
{{- toYaml $.ctx.Values.memcached.containerSecurityContext | nindent 12 }}
{{- if .extraVolumeMounts }}
volumeMounts:
{{- toYaml .extraVolumeMounts | nindent 12 }}
{{- end }}

{{- if $.ctx.Values.memcachedExporter.enabled }}
- name: exporter
{{- with $.ctx.Values.memcachedExporter.image }}
image: {{ .repository}}:{{ .tag }}
imagePullPolicy: {{ .pullPolicy }}
{{- end }}
ports:
- containerPort: 9150
name: http-metrics
args:
- "--memcached.address=localhost:{{ .port }}"
- "--web.listen-address=0.0.0.0:9150"
{{- range $key, $value := $.ctx.Values.memcachedExporter.extraArgs }}
- "--{{ $key }}{{ if $value }}={{ $value }}{{ end }}"
{{- end }}
resources:
{{- toYaml $.ctx.Values.memcachedExporter.resources | nindent 12 }}
securityContext:
{{- toYaml $.ctx.Values.memcachedExporter.containerSecurityContext | nindent 12 }}
{{- if .extraVolumeMounts }}
volumeMounts:
{{- toYaml .extraVolumeMounts | nindent 12 }}
{{- end }}
{{- end }}
{{- end -}}
{{- end -}}
{{- end -}}

42 changes: 42 additions & 0 deletions production/helm/loki/templates/memcached/_memcached-svc.tpl
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{{/*
memcached Service
Params:
ctx = . context
valuesSection = name of the section in values.yaml
component = name of the component
valuesSection and component are specified separately because helm prefers camelcase for naming convetion and k8s components are named with snake case.
*/}}
{{- define "loki.memcached.service" -}}
{{ with (index $.ctx.Values $.valuesSection) }}
{{- if .enabled -}}
apiVersion: v1
kind: Service
metadata:
name: {{ include "loki.resourceName" (dict "ctx" $.ctx "component" $.component) }}
labels:
{{- include "loki.labels" $.ctx | nindent 4 }}
app.kubernetes.io/component: "memcached-{{ $.component }}"
{{- with .service.labels }}
{{- toYaml . | nindent 4 }}
{{- end }}
annotations:
{{- toYaml .service.annotations | nindent 4 }}
namespace: {{ $.ctx.Release.Namespace | quote }}
spec:
type: ClusterIP
clusterIP: None
ports:
- name: memcached-client
port: {{ .port }}
targetPort: {{ .port }}
{{ if $.ctx.Values.memcachedExporter.enabled -}}
- name: http-metrics
port: 9150
targetPort: 9150
{{ end }}
selector:
{{- include "loki.selectorLabels" $.ctx | nindent 4 }}
app.kubernetes.io/component: "memcached-{{ $.component }}"
{{- end -}}
{{- end -}}
{{- end -}}
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{{- if .Values.resultsCache.enabled }}
apiVersion: {{ include "loki.pdb.apiVersion" . }}
kind: PodDisruptionBudget
metadata:
name: {{ include "loki.fullname" . }}-memcached-results-cache
namespace: {{ .Release.Namespace }}
labels:
{{- include "loki.selectorLabels" . | nindent 4 }}
app.kubernetes.io/component: memcached-results-cache
spec:
selector:
matchLabels:
{{- include "loki.selectorLabels" . | nindent 6 }}
app.kubernetes.io/component: memcached-results-cache
maxUnavailable: 1
{{- end -}}
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{{- include "loki.memcached.service" (dict "ctx" $ "valuesSection" "resultsCache" "component" "results-cache" ) }}
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{{- include "loki.memcached.statefulSet" (dict "ctx" $ "valuesSection" "resultsCache" "component" "results-cache" ) }}
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