kubernetes:gcp上的cassandra(状态集)部署

xfyts7mz  于 2021-06-15  发布在  Cassandra
关注(0)|答案(3)|浏览(378)

有人尝试过在gcp上使用kubernetes(而不是gke)部署cassandra(poc)吗。如果是的话,你能分享如何让它工作的信息吗?

o7jaxewo

o7jaxewo1#

使用 Helm :
在mac上:

brew install helm@2
brew link --force helm@2
helm init

为了避免Kubernetes掌舵地狱:从:https://github.com/helm/helm/issues/2224:

kubectl create serviceaccount --namespace kube-system tiller
kubectl create clusterrolebinding tiller-cluster-rule --clusterrole=cluster-admin --serviceaccount=kube-system:tiller

Cassandra

培养箱:

helm repo add https://github.com/helm/charts/tree/master/incubator/cassandra

helm install --namespace "cassandra" -n "cassandra" incubator/cassandra
helm status "cassandra"
helm delete  --purge "cassandra"

比特纳米:

helm repo add bitnami https://charts.bitnami.com/bitnami

helm install --namespace "cassandra" -n "my-deployment" bitnami/cassandra
helm status "my-deployment"
helm delete  --purge "my-deployment"
mrphzbgm

mrphzbgm2#

您可以先看看ibm在kubernetes上的可伸缩cassandra部署。
对于种子发现,您可以使用无头服务,类似于kubernetes简化的多节点cassandra集群。
一些困难:
k8s的快速本地存储仍处于测试阶段;当然,你可以用k8s已经有的东西;有一些用户报告说,他们使用ceph rbd,有8个c节点,每个节点在k8s上有2tb的数据。
在某个时候,你会意识到你需要一个c
操作符——这里有一些不错的启动——instaclustr的cassandra操作符和pantheon systems的cassandra操作符
您需要一种方法来在优雅的有状态应用程序中进行扩展(也应该由操作员负责;这是一个解决方案,如果你不需要一个操作员,但你仍然需要使用一个控制器)。
您还可以查看cassandra邮件列表,因为那里已经有人在生产中使用cassandra over K8。

z18hc3ub

z18hc3ub3#

我在kubernetes上实现了cassandra。请查找我的部署和服务yaml文件:

apiVersion: v1
kind: Service
metadata:
  labels:
    app: cassandra
  name: cassandra
spec:
  clusterIP: None
  ports:
  - port: 9042
  selector:
    app: cassandra
---
apiVersion: apps/v1beta2
kind: StatefulSet
metadata:
  name: cassandra
  labels:
    app: cassandra
spec:
  serviceName: cassandra
  replicas: 3
  updateStrategy:
    type: RollingUpdate
  selector:
    matchLabels:
      app: cassandra
  template:
    metadata:
      labels:
        app: cassandra
    spec:
      terminationGracePeriodSeconds: 1800
      containers:
      - name: cassandra
        image: gcr.io/google-samples/cassandra:v12
        imagePullPolicy: Always
        ports:
        - containerPort: 7000
          name: intra-node
        - containerPort: 7001
          name: tls-intra-node
        - containerPort: 7199
          name: jmx
        - containerPort: 9042
          name: cql
        resources:
          limits:
            cpu: "500m"
            memory: 1Gi
          requests:
           cpu: "500m"
           memory: 1Gi
        securityContext:
          capabilities:
            add:
              - IPC_LOCK
        lifecycle:
          preStop:
            exec:
              command: 
              - /bin/sh
              - -c
              - nodetool drain
        env:
          - name: MAX_HEAP_SIZE
            value: 512M
          - name: HEAP_NEWSIZE
            value: 100M
          - name: CASSANDRA_SEEDS
            value: "cassandra-0.cassandra.default.svc.cluster.local"
          - name: CASSANDRA_CLUSTER_NAME
            value: "K8Demo"
          - name: CASSANDRA_DC
            value: "DC1-K8Demo"
          - name: CASSANDRA_RACK
            value: "Rack1-K8Demo"
          - name: POD_IP
            valueFrom:
              fieldRef:
                fieldPath: status.podIP
        readinessProbe:
          exec:
            command:
            - /bin/bash
            - -c
            - /ready-probe.sh
          initialDelaySeconds: 15
          timeoutSeconds: 5
        volumeMounts:
        - name: cassandra-data
          mountPath: /cassandra_data
  volumeClaimTemplates:
  - metadata:
      name: cassandra-data
    spec:
      accessModes: [ "ReadWriteOnce" ]
      storageClassName: "fast"
      resources:
        requests:
          storage: 5Gi

希望这有帮助。

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