部署多个具有 frontend 组的 GreptimeDB 集群

在本指南中，你将学习如何在 Kubernetes 上部署具有多个 frontend 组的 GreptimeDB 集群。

先决条件

• Docker >= v23.0.0
• kubectl >= v1.18.0
• Helm >= v3.0.0
• GreptimeDB Operator >= v0.2.1-alpha.1
• ETCD

下载 CRD

首先，需要下载 GreptimeDB 集群的自定义资源 (CRD):

curl -LO https://github.com/GreptimeTeam/greptimedb-operator/releases/download/v0.2.1-alpha.1/greptimedbclusters.yaml

将 CRD 应用于 Kubernetes 集群:

kubectl apply -f greptimedbclusters.yaml --server-side --force-conflicts

升级 operator

安装 GreptimeDB Operator，将镜像版本设置为大于 v0.2.1-alpha.1。

helm repo update

helm upgrade \
  --install \
  --create-namespace \
  greptimedb-operator greptime/greptimedb-operator \
  -n greptimedb-admin

Frontend 组配置

定义 frontend 组时，必须为每个 frontend 实例指定名称字段。以下是创建读写 frontend 实例的示例配置:

apiVersion: greptime.io/v1alpha1
kind: GreptimeDBCluster
metadata:
  name: greptimedb
  namespace: default
spec:
  initializer:
    image: greptime/greptimedb-initializer:latest
  base:
    main:
      image: greptime/greptimedb:latest  
  frontends:
  - name: read
    replicas: 2
    config: |
      default_timezone = "UTC"
      [http]
      timeout = "60s"
  - name: write
    replicas: 1
    config: |
      default_timezone = "UTC"
      [http]
      timeout = "60s"
  meta:
    replicas: 1
    etcdEndpoints:
      - "etcd.etcd-cluster.svc.cluster.local:2379"
  datanode:
    replicas: 1

合规配置

设置 frontend 组时，必须设置名称。

# 非法配置 !!!
apiVersion: greptime.io/v1alpha1
kind: GreptimeDBCluster
metadata:
  name: greptimedb
spec:
  frontends: 
  #  - name: read #<=========The name must be set=============>
    - replicas: 1

校验安装

检查 Pod 的状态:

kubectl get pods -n default
NAME                                        READY   STATUS    RESTARTS   AGE
greptimedb-datanode-0                       1/1     Running   0          27s
greptimedb-frontend-read-66bf68bd5c-8kg8g   1/1     Running   0          21s
greptimedb-frontend-read-66bf68bd5c-x752l   1/1     Running   0          21s
greptimedb-frontend-write-bdd944b97-pkf9d   1/1     Running   0          21s
greptimedb-meta-699f74cd9d-42w2c            1/1     Running   0          87s

检查 services 状态:

kubectl get service -n default
NAME                        TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)                               AGE
greptimedb-datanode         ClusterIP   None            <none>        4001/TCP,4000/TCP                     102s
greptimedb-frontend-read    ClusterIP   10.96.174.200   <none>        4001/TCP,4000/TCP,4002/TCP,4003/TCP   42s
greptimedb-frontend-write   ClusterIP   10.96.223.1     <none>        4001/TCP,4000/TCP,4002/TCP,4003/TCP   42s
greptimedb-meta             ClusterIP   10.96.195.163   <none>        3002/TCP,4000/TCP                     3m4s

Conclusion

您已成功部署 GreptimeDB 集群，其 frontend 组由读写实例组成。您现在可以继续探索 GreptimeDB 集群的功能，或根据需要将其与其他工具集成。