K8S operator方式部署redis-cluster

今天药忘吃喽~ 2023-10-03 14:37 19阅读 0赞

## K8S部署redis-cluster-operator ##

### 开源地址 ###

https://github.com/ucloud/redis-cluster-operator

### 一、概述 ###

Redis Cluster Operator用于管理基于k8s的Redis Cluster  
该operator基于Operator framework之上（https://github.com/operator-framework/operator-sdk）

![在这里插入图片描述][20200902161255915.png]

每个master node和slave node由一个statefulset管理，每个statefulset创建一个headless svc， 所有的node创建一个clusterIP service。

每个statefulset使用PodAntiAffinity来确保master和slave部署在不同的node上。同时，当operator在一个statefulset上选择master时，他优先选择不同k8s nodes上的pod作为master。

### 二、Features ###

自定义master nodes的数量和replica nodes的数量  
Password  
安全地扩容Redis Cluster  
备份和恢复  
持久化卷  
自定义配置  
Prometheus发现

### 三、使用redis-cluster-operator ###

#### 3.1、部署一个redis cluster operator ####

注册CRD（Custom Resource Definition）：

$ kubectl create -f deploy/crds/redis.kun_distributedredisclusters_crd.yaml
    $ kubectl create -f deploy/crds/redis.kun_redisclusterbackups_crd.yaml

关键配置：

masterSize:
    format: int32
    type: integer
    minimum: 3
    maximum: 10
    clusterReplicas:
    format: int32
    type: integer
    minimum: 1
    maximum: 3
    serviceName:
    type: string
    pattern: '[a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*'

CRD的生命周期包括namespace和cluster，cluster > namespace：

// cluster-scoped
    $ kubectl create -f deploy/service_account.yaml
    $ kubectl create -f deploy/cluster/cluster_role.yaml
    $ kubectl create -f deploy/cluster/cluster_role_binding.yaml
    $ kubectl create -f deploy/cluster/operator.yaml
    
    // namespace-scoped
    $ kubectl create -f deploy/service_account.yaml
    $ kubectl create -f deploy/namespace/role.yaml
    $ kubectl create -f deploy/namespace/role_binding.yaml
    $ kubectl create -f deploy/namespace/operator.yaml

这样查看redis-cluster-operator是否运行：

$ kubectl get deployment
    NAME                     READY   UP-TO-DATE   AVAILABLE   AGE
    redis-cluster-operator   1/1     1            1           1d

部署一个redis cluster:

$ kubectl apply -f deploy/example/redis.kun_v1alpha1_distributedrediscluster_cr.yaml

扩容Redis Cluster：

apiVersion: redis.kun/v1alpha1
    kind: DistributedRedisCluster
    metadata:
      annotations:
        # if your operator run as cluster-scoped, add this annotations
        redis.kun/scope: cluster-scoped
      name: example-distributedrediscluster
    spec:
      # Increase the masterSize to trigger the scaling.
      masterSize: 4
      ClusterReplicas: 1
      image: redis:5.0.4-alpine

缩容Redis Cluster：

apiVersion: redis.kun/v1alpha1
    kind: DistributedRedisCluster
    metadata:
      annotations:
        # if your operator run as cluster-scoped, add this annotations
        redis.kun/scope: cluster-scoped
      name: example-distributedrediscluster
    spec:
      # Increase the masterSize to trigger the scaling.
      masterSize: 3
      ClusterReplicas: 1
      image: redis:5.0.4-alpine

[20200902161255915.png]: https://img-blog.csdnimg.cn/20200902161255915.png