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auto scale up and down with many named backends in k8s (#270)
This commit is contained in:
Stein van Broekhoven
GitHub
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docs/k8s-autoscale.yaml
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278
docs/k8s-autoscale.yaml
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# This YAML is an example and is not intended to be directly applied.
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# It consists of 3 parts
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# 1. the mc-router with service account an service
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# 2. the shutdown cronjob with service account
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# 3. the actual server with service and storage
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# part 3 is the only part you need to replicate for the number of servers you want
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# mc-router
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---
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apiVersion: v1
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kind: ServiceAccount
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metadata:
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name: mc-router
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---
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apiVersion: rbac.authorization.k8s.io/v1
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kind: ClusterRole
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metadata:
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name: services-watcher
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rules:
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- apiGroups: [""]
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resources: ["services"]
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verbs: ["watch","list"]
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- apiGroups: ["apps"]
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resources: ["statefulsets", "statefulsets/scale"]
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verbs: ["watch","list","get","update"]
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---
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apiVersion: rbac.authorization.k8s.io/v1
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kind: ClusterRoleBinding
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metadata:
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name: mc-router-services-watcher
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subjects:
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- kind: ServiceAccount
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name: mc-router
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namespace: default
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roleRef:
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kind: ClusterRole
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name: services-watcher
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apiGroup: rbac.authorization.k8s.io
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# Use whatever tcp ingress method you want I just used a node port here for simplicity
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---
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apiVersion: v1
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kind: Service
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metadata:
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name: mc-router
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spec:
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type: NodePort
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externalIPs:
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- 192.168.1.100
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ports:
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- targetPort: web
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name: web
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port: 8080
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nodePort: 30001
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- targetPort: proxy
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name: proxy
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port: 25565
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nodePort: 30000
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selector:
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run: mc-router
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---
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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labels:
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run: mc-router
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name: mc-router
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spec:
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selector:
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matchLabels:
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run: mc-router
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strategy:
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type: Recreate
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template:
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metadata:
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labels:
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run: mc-router
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spec:
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serviceAccountName: mc-router
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containers:
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- image: aapjeisbaas/mc-router:latest
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imagePullPolicy: Always
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name: mc-router
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args: ["--api-binding", ":8080", "--in-kube-cluster","--auto-scale-up", "--debug"]
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env:
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- name: AUTO_SCALE_UP
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value: "true"
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ports:
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- name: proxy
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containerPort: 25565
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- name: web
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containerPort: 8080
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resources:
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requests:
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memory: 50Mi
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cpu: "100m"
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limits:
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memory: 100Mi
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cpu: "250m"
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# Cron job for stopping empty servers
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---
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apiVersion: rbac.authorization.k8s.io/v1
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kind: ClusterRole
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metadata:
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name: mc-shutdown
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rules:
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- apiGroups: ["apps"]
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resources: ["statefulsets", "statefulsets/scale"]
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verbs: ["list","get","update", "patch"]
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- apiGroups: [""]
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resources: ["pods", "pods/log"]
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verbs: ["get", "list"]
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- apiGroups: [""]
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resources: ["pods/exec"]
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verbs: ["create"]
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---
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kind: ClusterRoleBinding
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apiVersion: rbac.authorization.k8s.io/v1
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metadata:
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name: mc-shutdown
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subjects:
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- kind: ServiceAccount
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name: mc-shutdown
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namespace: default
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roleRef:
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kind: ClusterRole
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name: mc-shutdown
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apiGroup: "rbac.authorization.k8s.io"
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---
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apiVersion: v1
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kind: ServiceAccount
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metadata:
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name: mc-shutdown
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---
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apiVersion: batch/v1
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kind: CronJob
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metadata:
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name: mc-shutdown
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spec:
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schedule: "*/5 * * * *"
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concurrencyPolicy: Forbid
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jobTemplate:
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spec:
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template:
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spec:
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serviceAccountName: mc-shutdown
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restartPolicy: OnFailure
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containers:
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- name: shutdown
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image: bitnami/kubectl:latest
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imagePullPolicy: IfNotPresent
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command:
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- /bin/bash
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- -c
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- source shutdown-script.sh
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volumeMounts:
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- name: shutdown-script
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mountPath: /shutdown-script.sh
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subPath: shutdown-script.sh
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readOnly: true
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volumes:
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- name: shutdown-script
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configMap:
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name: shutdown-script
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items:
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- key: shutdown-script.sh
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path: shutdown-script.sh
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# uses container label containertype=minecraft-server to find running servers
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# TODO: get ownerReferences link to StatefulSet/name from pod metadate instead of sed string manipulation
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---
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apiVersion: v1
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kind: ConfigMap
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metadata:
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name: shutdown-script
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data:
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shutdown-script.sh: |
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#!/bin/bash
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MC_PODS=$(kubectl get pods -l containertype=minecraft-server -o=jsonpath="{range .items[*]}{.metadata.name},"| sed 's/,/\n/g')
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for p in $MC_PODS; do
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echo "found minecraft pod $p, sleeping 120 seconds to prevent shutdown before login"
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sleep 120
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deployment=$(echo $p |sed 's/-0//g')
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# check online player count in the mc server
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if [[ $(kubectl exec -i $p -- /usr/local/bin/mc-monitor status) == *"online=0"* ]] ;then
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kubectl scale statefulset $deployment --replicas=0
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fi
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done
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# The actual minecraft servers, services and storage, repeat this block for as many servers as you want
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# make sure you have the label containertype=minecraft-server this is used to find running servers
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---
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apiVersion: apps/v1
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kind: StatefulSet
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metadata:
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name: minecraft-servername-deployment
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labels:
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app: minecraft-servername-container
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spec:
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serviceName: minecraft-servername-deployment
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selector:
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matchLabels:
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app: minecraft-servername-container
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replicas: 0
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template:
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metadata:
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labels:
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app: minecraft-servername-container
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containertype: minecraft-server
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spec:
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containers:
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- name: minecraft-servername-deployment
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image: itzg/minecraft-server:latest
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imagePullPolicy: IfNotPresent
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resources:
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limits:
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memory: "2048Mi"
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env:
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# Use secret in real usage
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- name: EULA
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value: "true"
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# let the JVM figure out mem management
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- name: "MEMORY"
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value: ""
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- name: JVM_XX_OPTS
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value: "-XX:MaxRAMPercentage=75"
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ports:
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- containerPort: 25565
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name: main
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readinessProbe:
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exec:
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command: [ "/usr/local/bin/mc-monitor", "status", "--host", "localhost" ]
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# Give it i + p * f seconds to be ready, so 120 seconds
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initialDelaySeconds: 20
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periodSeconds: 5
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failureThreshold: 20
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# Monitor ongoing liveness
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livenessProbe:
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exec:
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command: ["/usr/local/bin/mc-monitor", "status", "--host", "localhost"]
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initialDelaySeconds: 120
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periodSeconds: 60
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volumeMounts:
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- name: mc-data
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mountPath: /data
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volumes:
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- name: mc-data
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persistentVolumeClaim:
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claimName: minecraft-servername-pvc
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readOnly: false
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---
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apiVersion: v1
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kind: PersistentVolumeClaim
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metadata:
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name: minecraft-servername-pvc
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namespace: default
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spec:
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accessModes:
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- ReadWriteMany
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resources:
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requests:
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storage: 20Gi
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---
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apiVersion: v1
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kind: Service
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metadata:
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name: minecraft-servername-deployment
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namespace: default
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annotations:
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"mc-router.itzg.me/externalServerName": "your-awesome-server.public-domain.com"
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spec:
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ports:
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- port: 25565
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selector:
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app: minecraft-servername-container
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