add prometheus exporter for minecraft

charts/minecraft/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v1
 name: minecraft
-version: 2.0.8
+version: 2.0.9
 appVersion: SeeValues
 home: https://minecraft.net/
 description: Minecraft server

charts/minecraft/templates/deployment.yaml

@@ -35,7 +35,57 @@ spec:
         runAsUser: {{ .Values.securityContext.runAsUser }}
         fsGroup: {{ .Values.securityContext.fsGroup }}
       containers:
-      - name: {{ template "minecraft.fullname" . }}
+      {{- if .Values.monitor.enabled }}
+      - name: mc-monitor
+        image: "{{ .Values.monitor.image }}:{{ .Values.monitor.imageTag }}"
+        imagePullPolicy: Always
+        resources:
+{{ toYaml .Values.monitor.resources | indent 10 }}
+        args:
+        - {{ .Values.monitor.command }}
+        env:
+        {{- if eq .Values.monitor.command "gather-for-telegraf" }}
+        - name: GATHER_INTERVAL
+          value: {{ default "10s" .Values.monitor.gather_interval | quote }}
+
+        - name: GATHER_TELEGRAF_ADDRESS
+          value: {{ .Values.monitor.gather_telegraf_address }}
+
+        - name: GATHER_SERVERS
+          value: {{ default ":25565" .Values.monitor.gather_servers | quote }}
+        {{- end }}
+        {{- if eq .Values.monitor.command "export-for-prometheus" }}
+        - name: EXPORT_PORT
+          value: "9225"
+
+        - name: EXPORT_SERVERS
+          value: |-
+            {{ range $index, $host := .Values.monitor.prometheus.export_servers }}
+                {{- if $index }},{{ end }}{{ $host }}
+            {{- end }}
+
+        - name: EXPORT_BEDROCK_SERVERS
+          value: |-
+            {{ range $index, $host := .Values.monitor.prometheus.export_bedrock_servers }}
+                {{- if $index }},{{ end }}{{ $host }}
+            {{- end }}
+        - name: DEBUG
+          value: {{ default "false" .Values.monitor.prometheus.debug | quote }}
+        {{- end }}
+
+        {{- range $key, $value := .Values.monitor.extraEnv }}
+        - name: {{ $key }}
+          value: {{ $value | quote }}
+        {{- end }}
+
+        {{- if eq .Values.monitor.command "export-for-prometheus" }}
+        ports:
+        - name: monitor
+          containerPort: 9225
+          protocol: TCP
+        {{- end }}
+      {{- end }}
+      - name: minecraft-server
         image: "{{ .Values.image }}:{{ .Values.imageTag }}"
         imagePullPolicy: Always
         resources:
@@ -192,6 +242,11 @@ spec:
           containerPort: {{ .Values.minecraftServer.rcon.port }}
           protocol: TCP
         {{- end }}
+        {{- if .Values.prometheus_exporter.enabled }}
+        - name: monitor
+          containerPort: {{ .Values.prometheus_exporter.port }}
+          protocol: TCP
+        {{- end }}
         volumeMounts:
         - name: datadir
           mountPath: /data

charts/minecraft/templates/minecraft-svc.yaml

@@ -7,6 +7,8 @@ metadata:
     chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
     release: "{{ .Release.Name }}"
     heritage: "{{ .Release.Service }}"
+  annotations:
+{{ toYaml .Values.minecraftServer.serviceAnnotations | indent 4 }}
 spec:
 {{- if (or (eq .Values.minecraftServer.serviceType "ClusterIP") (empty .Values.minecraftServer.serviceType)) }}
   type: ClusterIP

charts/minecraft/templates/servicemonitor.yml

@@ -0,0 +1,40 @@
+{{- if .Values.servicemonitor.enabled }}
+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  name: {{ template "minecraft.fullname" . }}
+{{- if .Values.servicemonitor.namespace }}
+  namespace: {{ .Values.servicemonitor.namespace }}
+{{- else }}
+  namespace: {{ .Release.Namespace | quote }}
+{{- end }}
+  labels:
+    app: {{ template "minecraft.fullname" . }}
+    chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
+    release: "{{ .Release.Name }}"
+    heritage: "{{ .Release.Service }}"
+    prometheus: {{ .Values.servicemonitor.prometheusInstance }}
+{{- if .Values.servicemonitor.labels }}
+{{ toYaml .Values.servicemonitor.labels | indent 4}}
+{{- end }}
+spec:
+  jobLabel: {{ template "minecraft.fullname" . }}
+  selector:
+    matchLabels:
+      app: {{ template "minecraft.fullname" . }}
+      chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
+      release: "{{ .Release.Name }}"
+      heritage: "{{ .Release.Service }}"
+  namespaceSelector:
+    matchNames:
+      - {{ .Release.Namespace }}
+  endpoints:
+  - targetPort: {{ .Values.servicemonitor.targetPort }}
+    path: {{ .Values.servicemonitor.path }}
+    interval: {{ .Values.servicemonitor.interval }}
+    scrapeTimeout: {{ .Values.servicemonitor.scrapeTimeout }}
+    relabelings:
+    - sourceLabels: ['__address__']
+      targetLabel: 'server_name'
+      replacement: '{{ template "minecraft.fullname" . }}'
+{{- end }}

charts/minecraft/values.yaml

@@ -127,6 +127,11 @@ minecraftServer:
   # Options like -X that need to proceed general JVM options
   jvmXXOpts: ""
   serviceAnnotations: {}
+    # Routes Minecraft client connections to backend servers
+    # https://github.com/itzg/mc-router
+    # "mc-router.itzg.me/externalServerName": "mc-stable.example.com"
+    # Let External DNS auto create DNS record
+    # "external-dns.alpha.kubernetes.io/hostname": "mc-stable.example.com"
   serviceType: ClusterIP
   loadBalancerIP:
   # loadBalancerSourceRanges: []
@@ -151,6 +156,57 @@ minecraftServer:
     enabled: false
     port: 25565
 
+prometheus_exporter:
+  # If you enable this, make SURE to install Prometheus Exporter.
+  # Plugin for bukkit server
+  # and change plugin's config to listen on 0.0.0.0
+  # https://dev.bukkit.org/projects/prometheus-exporter
+  # Mod for Forge server
+  # https://www.curseforge.com/minecraft/mc-mods/prometheus-exporter
+  enabled: false
+  # Prometheus Exporter Plugin: 9225
+  # Prometheus Exporter Mod: 19125
+  port: 9225
+
+# If you enable this, make SURE to install Prometheus Operator.
+# https://github.com/prometheus-operator/prometheus-operator
+servicemonitor:
+  enabled: false
+  prometheusInstance: default
+  labels: {}
+  # Prometheus Exporter Plugin: 9225
+  # Prometheus Exporter Mod: 19125
+  targetPort: 9225
+  path: /metrics
+  interval: 15s
+  scrapeTimeout: 10s
+
+monitor:
+  enabled: false
+  image: itzg/mc-monitor
+  imageTag: latest
+  # Command: export-for-prometheus or gather-for-telegraf
+  command: export-for-prometheus
+  telegraf:
+    gather_interval: 10s
+    gather_telegraf_address: telegraf:8094
+  prometheus:
+    port: 9225
+    # List of Java edition servers
+    export_servers:
+    - localhost:25565
+    export_bedrock_servers: []
+    debug: false
+  resources:
+    requests:
+      cpu: 100m
+      memory: 200Mi
+    limits:
+      cpu: 300m
+      memory: 400Mi
+
+
+
 ## Additional minecraft container environment variables
 ##
 extraEnv: {}