K8S Operator的开发与使用

从应用角度考虑，为什么会出现如此多的Operator场景，为什么很多中间件和厂商都会提供基于Operator的部署方案，他的价值是什么？

随着时代的发展，企业应用部署环境从传统的物理机->虚拟机->容器->集群，现在k8s已司空见惯，作为企业应用运行基础环境的kubernates的能力也越来越多的被关注，集群的企业应用个人看来是分为几个方向

1、应用部署，使用容器的基本能力，部署应用，享受容器化以及集群管理带来的各项利好

2、Operator应用，当我们在运用集群能力部署应用时，可能需要一组资源同时部署、可能需要多个部署步骤、可能需要依赖多个对象、可能需要自定义参数及转换、可能需要监控故障、可能需要在故障时手动输入命令恢复，那么这些纯靠人工就需要好多步骤，如果开发一个Operator，通过它来管理对象的资源定义及管理，监控对象的生命周期，处理对象的异常事件，这样就很方便了，提升了组件的使用门槛和运维难度

3、集群能力提升，集群本身的能力是基于普遍场景，未结合企业应用的实际特点，故需要在集群原有能力基础上，扩展或新增能力，比如开发自己的调度器，比如构建自己的个性化弹性能力

既然要说Operator，就要说下什么是Operator，如果不了解K8S研发背景的可以百度或参考其他博文，大概就是k8s提供了各类扩展框架，最原始的是client-go，后来是更便利的kubebuilder（k8s）和operator-sdk（coreos）逐步统一，用户只需要按照预定的规范创建即可，看视频一看就懂 https://github.com/kubernetes-sigs/kubebuilder/blob/master/docs/gif/kb-demo.v2.0.1.svg

想一下，开发一个Operator需要什么？ Operator就是注册了自己的逻辑到集群里，那么就要定义自己的CRD（非必需）、定义自己的监听、定义监听到对应事件之后的处理逻辑，可以先看一个最简单的实现 https://github.com/kubernetes/sample-controller

controller中注册事件监听处理器，分别处理时间AddFunc、UpdateFunc、DeleteFunc，将事件消息加入队列

消费队列处理，具体逻辑在handler里

上面是最最最简单的一个例子，其实也足够了解一般Operator定义的全过程了

CRD定义及使用在https://github.com/kubernetes/sample-controller/tree/master/artifacts/examples

好了，其实中间件提供的Operator也大同小异，这里以redis的两个operator为例看下这东西到底做了啥

首先是Redis集群，想一下，如果手工创建的核心步骤有哪些？

配置启动服务->CLUSTER MEET IP PORT互相发现->CLUSTER ADDSLOTS手动分配槽位->CLUSTER REPLICATE建立主从关系->各类故障发现及恢复

上面的步骤显而易见的繁琐，如果能通过集群自动运维是不是方便多了，于是就有了下面的这类Operator

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

基础基于operator-sdk https://github.com/operator-framework/operator-sdk

按文档部署，版本不匹配还报错

error: error validating "redis.kun_redisclusterbackups_crd.yaml": error validating data: [ValidationError(CustomResourceDefinition.spec): unknown field "additionalPrinterColumns" in io.k8s.apiextensions-apiserver.pkg.apis.apiextensions.v1.CustomResourceDefinitionSpec, ValidationError(CustomResourceDefinition.spec): unknown field "subresources" in io.k8s.apiextensions-apiserver.pkg.apis.apiextensions.v1.CustomResourceDefinitionSpec, ValidationError(CustomResourceDefinition.spec): unknown field "validation" in io.k8s.apiextensions-apiserver.pkg.apis.apiextensions.v1.CustomResourceDefinitionSpec]; if you choose to ignore these errors, turn validation off with --validate=false

当前版本的customresourcedefinitions版本是apiextensions.k8s.io/v1，而组件安装是基于apiVersion: apiextensions.k8s.io/v1beta1的，所以失败，怎么办？

转？ kubectl-convert？不行 https://kubernetes.io/docs/tasks/tools/install-kubectl-linux/

回头到github里找issue，还真有 https://github.com/ucloud/redis-cluster-operator/issues/95，按照里面大佬给的果然就可以了

# Thus this yaml has been adapted for k8s v1.22 as per:
# https://kubernetes.io/docs/reference/using-api/deprecation-guide/#customresourcedefinition-v122
#
apiVersion: apiextensions.k8s.io/v1
kind: CustomResourceDefinition
metadata:
  name: distributedredisclusters.redis.kun
spec:
  group: redis.kun
  names:
    kind: DistributedRedisCluster
    listKind: DistributedRedisClusterList
    plural: distributedredisclusters
    singular: distributedrediscluster
    shortNames:
    - drc
  scope: Namespaced
  versions:
  - name: v1alpha1
    served: true
    storage: true
    subresources:
      status: {}
    additionalPrinterColumns:
      - name: MasterSize
        jsonPath: .spec.masterSize
        description: The number of redis master node in the ensemble
        type: integer
      - name: Status
        jsonPath: .status.status
        description: The status of redis cluster
        type: string
      - name: Age
        jsonPath: .metadata.creationTimestamp
        type: date
      - name: CurrentMasters
        jsonPath: .status.numberOfMaster
        priority: 1
        description: The current master number of redis cluster
        type: integer
      - name: Images
        jsonPath: .spec.image
        priority: 1
        description: The image of redis cluster
        type: string
    schema:
      openAPIV3Schema:
        description: DistributedRedisCluster is the Schema for the distributedredisclusters API
        type: object
        properties:
          apiVersion:
            description: 'APIVersion defines the versioned schema of this representation
              of an object. Servers should convert recognized schemas to the latest
              internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#resources'
            type: string
          kind:
            description: 'Kind is a string value representing the REST resource this
              object represents. Servers may infer this from the endpoint the client
              submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#types-kinds'
            type: string
          metadata:
            type: object
          spec:
            description: DistributedRedisClusterSpec defines the desired state of DistributedRedisCluster
            type: object
            properties:
              masterSize:
                format: int32
                type: integer
                minimum: 1
                maximum: 3
              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])?)*'
              annotations:
                additionalProperties:
                  type: string
                type: object
              config:
                additionalProperties:
                  type: string
                type: object
              passwordSecret:
                additionalProperties:
                  type: string
                type: object
              storage:
                type: object
                properties:
                  type:
                    type: string
                  size:
                    type: string
                  class:
                    type: string
                  deleteClaim:
                    type: boolean
              image:
                type: string
              securityContext:
                description: 'SecurityContext defines the security options the container should be run with'
                type: object
                properties:
                  allowPrivilegeEscalation:
                    type: boolean
                  privileged:
                    type: boolean
                  readOnlyRootFilesystem:
                    type: boolean
                  capabilities:
                    type: object
                    properties:
                      add:
                        items:
                          type: string
                        type: array
                      drop:
                        items:
                          type: string
                        type: array
                  sysctls:
                    items:
                      type: object
                      properties:
                        name:
                          type: string
                        value:
                          type: string
                      required:
                        - name
                        - value
                    type: array
              resources:
                type: object
                properties:
                  requests:
                    type: object
                    additionalProperties:
                      type: string
                  limits:
                    type: object
                    additionalProperties:
                      type: string
              toleRations:
                type: array
                items:
                  type: object
                  properties:
                    effect:
                      type: string
                    key:
                      type: string
                    operator:
                      type: string
                    tolerationSeconds:
                      type: integer
                      format: int64
                    value:
                      type: string
          status:
            description: DistributedRedisClusterStatus defines the observed state of DistributedRedisCluster
            type: object
            properties:
              numberOfMaster:
                type: integer
                format: int32
              reason:
                type: string
              status:
                type: string
              maxReplicationFactor:
                type: integer
                format: int32
              minReplicationFactor:
                type: integer
                format: int32
              status:
                type: string
              reason:
                type: string

---
apiVersion: apiextensions.k8s.io/v1
kind: CustomResourceDefinition
metadata:
  name: redisclusterbackups.redis.kun
spec:
  group: redis.kun
  names:
    kind: RedisClusterBackup
    listKind: RedisClusterBackupList
    plural: redisclusterbackups
    singular: redisclusterbackup
    shortNames:
      - drcb
  scope: Namespaced
  versions:
    - name: v1alpha1
      # Each version can be enabled/disabled by Served flag.
      served: true
      # One and only one version must be marked as the storage version.
      storage: true
      subresources:
        status: {}
      additionalPrinterColumns:
        - jsonPath: .metadata.creationTimestamp
          name: Age
          type: date
        - jsonPath: .status.phase
          description: The phase of redis cluster backup
          name: Phase
          type: string
      schema:
        openAPIV3Schema:
          description: RedisClusterBackup is the Schema for the redisclusterbackups
            API
          properties:
            apiVersion:
              description: 'APIVersion defines the versioned schema of this representation
                of an object. Servers should convert recognized schemas to the latest
                internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#resources'
              type: string
            kind:
              description: 'Kind is a string value representing the REST resource this
                object represents. Servers may infer this from the endpoint the client
                submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#types-kinds'
              type: string
            metadata:
              type: object
            spec:
              description: RedisClusterBackupSpec defines the desired state of RedisClusterBackup
              type: object
            status:
              description: RedisClusterBackupStatus defines the observed state of RedisClusterBackup
              type: object
          type: object

整体看下代码有啥逻辑，忽略部分，可以看到入口是main.go，进来之后新建了manager，将Schema定义和管理器注册到了K8S，启动了管理器

目录基本符合K8S的整体编码风格，cmd定义执行起点，pkg为主程序，api定义api定义描述，controller定义了具体的监听和事件处理，其他工具类便于操作k8s、便于访问redis、便于创建各类资源等

以集群控制器为例，加入了Reconciler

加入了监听逻辑对创建、更新、删除都做了监听增加了对应的处理逻辑

协调处理逻辑，获取集群定义，检查状态与预期对比，构建集群，发现异常以及自动恢复

k8s operator 中reconcile当资源变化时就会触发reconcile方法，kubebuilder中在reconcile返回时，通过return reconcile.Result{RequeueAfter: SyncBuildStatusInterval}指定下次调度间隔 ，operator会将该资源变动的event重新放入队列，然后等到RequeueAfter参数指定的时间间隔之后重新取出来再调用reconcile处理。降低频繁写etcd，保障k8s集群不受影响

// Reconcile reads that state of the cluster for a DistributedRedisCluster object and makes changes based on the state read
// and what is in the DistributedRedisCluster.Spec
// Note:
// The Controller will requeue the Request to be processed again if the returned error is non-nil or
// Result.Requeue is true, otherwise upon completion it will remove the work from the queue.
func (r *ReconcileDistributedRedisCluster) Reconcile(request reconcile.Request) (reconcile.Result, error) {
    reqLogger := log.WithValues("Request.Namespace", request.Namespace, "Request.Name", request.Name)
    reqLogger.Info("Reconciling DistributedRedisCluster")

    // Fetch the DistributedRedisCluster instance
    instance := &redisv1alpha1.DistributedRedisCluster{}
    err := r.client.Get(context.TODO(), request.NamespacedName, instance)
    if err != nil {
        if errors.IsNotFound(err) {
            return reconcile.Result{}, nil
        }
        return reconcile.Result{}, err
    }

    ctx := &syncContext{
        cluster:   instance,
        reqLogger: reqLogger,
    }

    err = r.ensureCluster(ctx)
    if err != nil {
        switch GetType(err) {
        case StopRetry:
            reqLogger.Info("invalid", "err", err)
            return reconcile.Result{}, nil
        }
        reqLogger.WithValues("err", err).Info("ensureCluster")
        newStatus := instance.Status.DeepCopy()
        SetClusterScaling(newStatus, err.Error())
        r.updateClusterIfNeed(instance, newStatus, reqLogger)
        return reconcile.Result{RequeueAfter: requeueAfter}, nil
    }

    matchLabels := getLabels(instance)
    redisClusterPods, err := r.statefulSetController.GetStatefulSetPodsByLabels(instance.Namespace, matchLabels)
    if err != nil {
        return reconcile.Result{}, Kubernetes.Wrap(err, "GetStatefulSetPods")
    }

    ctx.pods = clusterPods(redisClusterPods.Items)
    reqLogger.V(6).Info("debug cluster pods", "", ctx.pods)
    ctx.healer = clustermanger.NewHealer(&heal.CheckAndHeal{
        Logger:     reqLogger,
        PodControl: k8sutil.NewPodController(r.client),
        Pods:       ctx.pods,
        DryRun:     false,
    })
    err = r.waitPodReady(ctx)
    if err != nil {
        switch GetType(err) {
        case Kubernetes:
            return reconcile.Result{}, err
        }
        reqLogger.WithValues("err", err).Info("waitPodReady")
        newStatus := instance.Status.DeepCopy()
        SetClusterScaling(newStatus, err.Error())
        r.updateClusterIfNeed(instance, newStatus, reqLogger)
        return reconcile.Result{RequeueAfter: requeueAfter}, nil
    }

    password, err := statefulsets.GetClusterPassword(r.client, instance)
    if err != nil {
        return reconcile.Result{}, Kubernetes.Wrap(err, "getClusterPassword")
    }

    admin, err := newRedisAdmin(ctx.pods, password, config.RedisConf(), reqLogger)
    if err != nil {
        return reconcile.Result{}, Redis.Wrap(err, "newRedisAdmin")
    }
    defer admin.Close()

    clusterInfos, err := admin.GetClusterInfos()
    if err != nil {
        if clusterInfos.Status == redisutil.ClusterInfosPartial {
            return reconcile.Result{}, Redis.Wrap(err, "GetClusterInfos")
        }
    }

    requeue, err := ctx.healer.Heal(instance, clusterInfos, admin)
    if err != nil {
        return reconcile.Result{}, Redis.Wrap(err, "Heal")
    }
    if requeue {
        return reconcile.Result{RequeueAfter: requeueAfter}, nil
    }

    ctx.admin = admin
    ctx.clusterInfos = clusterInfos
    err = r.waitForClusterJoin(ctx)
    if err != nil {
        switch GetType(err) {
        case Requeue:
            reqLogger.WithValues("err", err).Info("requeue")
            return reconcile.Result{RequeueAfter: requeueAfter}, nil
        }
        newStatus := instance.Status.DeepCopy()
        SetClusterFailed(newStatus, err.Error())
        r.updateClusterIfNeed(instance, newStatus, reqLogger)
        return reconcile.Result{}, err
    }

    // mark .Status.Restore.Phase = RestorePhaseRestart, will
    // remove init container and restore volume that referenced in stateulset for
    // dump RDB file from backup, then the redis master node will be restart.
    if instance.IsRestoreFromBackup() && instance.IsRestoreRunning() {
        reqLogger.Info("update restore redis cluster cr")
        instance.Status.Restore.Phase = redisv1alpha1.RestorePhaseRestart
        if err := r.crController.UpdateCRStatus(instance); err != nil {
            return reconcile.Result{}, err
        }
        if err := r.ensurer.UpdateRedisStatefulsets(instance, getLabels(instance)); err != nil {
            return reconcile.Result{}, err
        }
        waiter := &waitStatefulSetUpdating{
            name:                  "waitMasterNodeRestarting",
            timeout:               60 * time.Second,
            tick:                  5 * time.Second,
            statefulSetController: r.statefulSetController,
            cluster:               instance,
        }
        if err := waiting(waiter, ctx.reqLogger); err != nil {
            return reconcile.Result{}, err
        }
        return reconcile.Result{Requeue: true}, nil
    }

    // restore succeeded, then update cr and wait for the next Reconcile loop
    if instance.IsRestoreFromBackup() && instance.IsRestoreRestarting() {
        reqLogger.Info("update restore redis cluster cr")
        instance.Status.Restore.Phase = redisv1alpha1.RestorePhaseSucceeded
        if err := r.crController.UpdateCRStatus(instance); err != nil {
            return reconcile.Result{}, err
        }
        // set ClusterReplicas = Backup.Status.ClusterReplicas,
        // next Reconcile loop the statefulSet's replicas will increase by ClusterReplicas, then start the slave node
        instance.Spec.ClusterReplicas = instance.Status.Restore.Backup.Status.ClusterReplicas
        if err := r.crController.UpdateCR(instance); err != nil {
            return reconcile.Result{}, err
        }
        return reconcile.Result{}, nil
    }

    if err := admin.SetConfigIfNeed(instance.Spec.Config); err != nil {
        return reconcile.Result{}, Redis.Wrap(err, "SetConfigIfNeed")
    }

    status := buildClusterStatus(clusterInfos, ctx.pods, instance, reqLogger)
    if is := r.isScalingDown(instance, reqLogger); is {
        SetClusterRebalancing(status, "scaling down")
    }
    reqLogger.V(4).Info("buildClusterStatus", "status", status)
    r.updateClusterIfNeed(instance, status, reqLogger)

    instance.Status = *status
    if needClusterOperation(instance, reqLogger) {
        reqLogger.Info(">>>>>> clustering")
        err = r.syncCluster(ctx)
        if err != nil {
            newStatus := instance.Status.DeepCopy()
            SetClusterFailed(newStatus, err.Error())
            r.updateClusterIfNeed(instance, newStatus, reqLogger)
            return reconcile.Result{}, err
        }
    }

    newClusterInfos, err := admin.GetClusterInfos()
    if err != nil {
        if clusterInfos.Status == redisutil.ClusterInfosPartial {
            return reconcile.Result{}, Redis.Wrap(err, "GetClusterInfos")
        }
    }
    newStatus := buildClusterStatus(newClusterInfos, ctx.pods, instance, reqLogger)
    SetClusterOK(newStatus, "OK")
    r.updateClusterIfNeed(instance, newStatus, reqLogger)
    return reconcile.Result{RequeueAfter: time.Duration(reconcileTime) * time.Second}, nil
}

创建

apiVersion: redis.kun/v1alpha1
kind: DistributedRedisCluster
metadata:
  name: example-distributedrediscluster
  namespace: default
spec:
  image: redis:5.0.4-alpine
  imagePullPolicy: IfNotPresent
  masterSize: 3
  clusterReplicas: 1
  serviceName: redis-svc
  # resources config
  resources:
    limits:
      cpu: 300m
      memory: 200Mi
    requests:
      cpu: 200m
      memory: 150Mi
  # pv storage
  storage:
    type: persistent-claim
    size: 1Gi
    class: disk
    deleteClaim: true

部署效果跟官网下图一样，Operator在创建时做了

1. 配置启动服务
2. CLUSTER MEET IP PORT互相发现
3. CLUSTER ADDSLOTS分配槽位
4. CLUSTER REPLICATE建立主从关系
5. SVC及其他资源创建
6. 资源及状态监测

 

 Operator协调日志

{"level":"info","ts":1674011374.0957515,"logger":"cmd","msg":"Go Version: go1.13.3"}
{"level":"info","ts":1674011374.095774,"logger":"cmd","msg":"Go OS/Arch: linux/amd64"}
{"level":"info","ts":1674011374.095777,"logger":"cmd","msg":"Version of operator-sdk: v0.13.0"}
{"level":"info","ts":1674011374.0957801,"logger":"cmd","msg":"Version of operator: v0.2.0-62+12f703c"}
{"level":"info","ts":1674011374.0959022,"logger":"leader","msg":"Trying to become the leader."}
{"level":"info","ts":1674011374.720209,"logger":"leader","msg":"Found existing lock","LockOwner":"redis-cluster-operator-7467976bc5-87f89"}
{"level":"info","ts":1674011374.7400174,"logger":"leader","msg":"Not the leader. Waiting."}
{"level":"info","ts":1674011375.8324194,"logger":"leader","msg":"Not the leader. Waiting."}
{"level":"info","ts":1674011378.1799858,"logger":"leader","msg":"Became the leader."}
{"level":"info","ts":1674011378.7850115,"logger":"controller-runtime.metrics","msg":"metrics server is starting to listen","addr":"0.0.0.0:8383"}
{"level":"info","ts":1674011378.7851572,"logger":"cmd","msg":"Registering Components."}
{"level":"info","ts":1674011381.2693467,"logger":"metrics","msg":"Metrics Service object updated","Service.Name":"redis-cluster-operator-metrics","Service.Namespace":"default"}
{"level":"info","ts":1674011381.873133,"logger":"cmd","msg":"Could not create ServiceMonitor object","error":"no ServiceMonitor registered with the API"}
{"level":"info","ts":1674011381.8731618,"logger":"cmd","msg":"Install prometheus-operator in your cluster to create ServiceMonitor objects","error":"no ServiceMonitor registered with the API"}
{"level":"info","ts":1674011381.873167,"logger":"cmd","msg":"Starting the Cmd."}
{"level":"info","ts":1674011381.8733594,"logger":"controller-runtime.manager","msg":"starting metrics server","path":"/metrics"}
{"level":"info","ts":1674011381.8734646,"logger":"controller-runtime.controller","msg":"Starting EventSource","controller":"redisclusterbackup-controller","source":"kind source: /, Kind="}
{"level":"info","ts":1674011381.8735168,"logger":"controller-runtime.controller","msg":"Starting EventSource","controller":"distributedrediscluster-controller","source":"kind source: /, Kind="}
{"level":"info","ts":1674011381.9737544,"logger":"controller-runtime.controller","msg":"Starting EventSource","controller":"redisclusterbackup-controller","source":"kind source: /, Kind="}
{"level":"info","ts":1674011381.9740582,"logger":"controller-runtime.controller","msg":"Starting Controller","controller":"distributedrediscluster-controller"}
{"level":"info","ts":1674011381.9740942,"logger":"controller_distributedrediscluster","msg":"Call CreateFunc","namespace":"default","name":"example-distributedrediscluster"}
{"level":"info","ts":1674011382.074047,"logger":"controller-runtime.controller","msg":"Starting Controller","controller":"redisclusterbackup-controller"}
{"level":"info","ts":1674011382.0740838,"logger":"controller-runtime.controller","msg":"Starting workers","controller":"redisclusterbackup-controller","worker count":2}
{"level":"info","ts":1674011382.0741792,"logger":"controller-runtime.controller","msg":"Starting workers","controller":"distributedrediscluster-controller","worker count":4}
{"level":"info","ts":1674011382.0742629,"logger":"controller_distributedrediscluster","msg":"Reconciling DistributedRedisCluster","Request.Namespace":"default","Request.Name":"example-distributedrediscluster"}
{"level":"info","ts":1674011382.617124,"logger":"controller_distributedrediscluster","msg":">>> Sending CLUSTER MEET messages to join the cluster","Request.Namespace":"default","Request.Name":"example-distributedrediscluster"}
{"level":"info","ts":1674011382.6185405,"logger":"controller_distributedrediscluster.redis_util","msg":"node 10.43.0.198:6379 attached properly","Request.Namespace":"default","Request.Name":"example-distributedrediscluster"}
{"level":"info","ts":1674011383.6385891,"logger":"controller_distributedrediscluster","msg":"requeue","Request.Namespace":"default","Request.Name":"example-distributedrediscluster","err":"wait for cluster join: Cluster view is inconsistent"}
{"level":"info","ts":1674011393.6389103,"logger":"controller_distributedrediscluster","msg":"Reconciling DistributedRedisCluster","Request.Namespace":"default","Request.Name":"example-distributedrediscluster"}
{"level":"info","ts":1674011393.6871004,"logger":"controller_distributedrediscluster","msg":">>> Sending CLUSTER MEET messages to join the cluster","Request.Namespace":"default","Request.Name":"example-distributedrediscluster"}
{"level":"info","ts":1674011393.688571,"logger":"controller_distributedrediscluster.redis_util","msg":"node 10.43.0.198:6379 attached properly","Request.Namespace":"default","Request.Name":"example-distributedrediscluster"}
{"level":"info","ts":1674011394.7059786,"logger":"controller_distributedrediscluster","msg":"requeue","Request.Namespace":"default","Request.Name":"example-distributedrediscluster","err":"wait for cluster join: Cluster view is inconsistent"}
{"level":"info","ts":1674011404.7062836,"logger":"controller_distributedrediscluster","msg":"Reconciling DistributedRedisCluster","Request.Namespace":"default","Request.Name":"example-distributedrediscluster"}
{"level":"info","ts":1674011404.7589452,"logger":"controller_distributedrediscluster","msg":">>> Sending CLUSTER MEET messages to join the cluster","Request.Namespace":"default","Request.Name":"example-distributedrediscluster"}
{"level":"info","ts":1674011404.76041,"logger":"controller_distributedrediscluster.redis_util","msg":"node 10.43.0.68:6379 attached properly","Request.Namespace":"default","Request.Name":"example-distributedrediscluster"}
{"level":"info","ts":1674011405.7788498,"logger":"controller_distributedrediscluster","msg":"requeue","Request.Namespace":"default","Request.Name":"example-distributedrediscluster","err":"wait for cluster join: Cluster view is inconsistent"}
{"level":"info","ts":1674011415.7791476,"logger":"controller_distributedrediscluster","msg":"Reconciling DistributedRedisCluster","Request.Namespace":"default","Request.Name":"example-distributedrediscluster"}
{"level":"info","ts":1674011415.8322582,"logger":"controller_distributedrediscluster","msg":">>> Sending CLUSTER MEET messages to join the cluster","Request.Namespace":"default","Request.Name":"example-distributedrediscluster"}
{"level":"info","ts":1674011415.8336947,"logger":"controller_distributedrediscluster.redis_util","msg":"node 10.43.0.134:6379 attached properly","Request.Namespace":"default","Request.Name":"example-distributedrediscluster"}
{"level":"info","ts":1674011416.8505604,"logger":"controller_distributedrediscluster","msg":"requeue","Request.Namespace":"default","Request.Name":"example-distributedrediscluster","err":"wait for cluster join: Cluster view is inconsistent"}
{"level":"info","ts":1674011426.850888,"logger":"controller_distributedrediscluster","msg":"Reconciling DistributedRedisCluster","Request.Namespace":"default","Request.Name":"example-distributedrediscluster"}
{"level":"info","ts":1674011426.9262946,"logger":"controller_distributedrediscluster","msg":">>>>>> clustering","Request.Namespace":"default","Request.Name":"example-distributedrediscluster"}
{"level":"error","ts":1674011426.9263313,"logger":"controller_distributedrediscluster","msg":"fix manually","Request.Namespace":"default","Request.Name":"example-distributedrediscluster","statefulSet":"drc-example-distributedrediscluster-2","masters":"{Redis ID: feb151649216937e13721cb36a671ca8b1425ed8, role: Master, master: , link: connected, status: [], addr: 10.43.1.4:6379, slots: [5461-10922], len(migratingSlots): 0, len(importingSlots): 0},{Redis ID: e0129438837cd65796a88997848a660b8e73b9b8, role: Master, master: , link: connected, status: [], addr: 10.43.0.15:6379, slots: [10923-16383], len(migratingSlots): 0, len(importingSlots): 0}","error":"split brain","stacktrace":"github.com/go-logr/zapr.(*zapLogger).Error\n\t/go/pkg/mod/github.com/go-logr/zapr@v0.1.1/zapr.go:128\ngithub.com/ucloud/redis-cluster-operator/pkg/controller/clustering.(*Ctx).DispatchMasters\n\t/src/pkg/controller/clustering/placement_v2.go:77\ngithub.com/ucloud/redis-cluster-operator/pkg/controller/distributedrediscluster.(*ReconcileDistributedRedisCluster).syncCluster\n\t/src/pkg/controller/distributedrediscluster/sync_handler.go:200\ngithub.com/ucloud/redis-cluster-operator/pkg/controller/distributedrediscluster.(*ReconcileDistributedRedisCluster).Reconcile\n\t/src/pkg/controller/distributedrediscluster/distributedrediscluster_controller.go:326\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.4.0/pkg/internal/controller/controller.go:256\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.4.0/pkg/internal/controller/controller.go:232\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).worker\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.4.0/pkg/internal/controller/controller.go:211\nk8s.io/apimachinery/pkg/util/wait.JitterUntil.func1\n\t/go/pkg/mod/k8s.io/apimachinery@v0.0.0-20191004115801-a2eda9f80ab8/pkg/util/wait/wait.go:152\nk8s.io/apimachinery/pkg/util/wait.JitterUntil\n\t/go/pkg/mod/k8s.io/apimachinery@v0.0.0-20191004115801-a2eda9f80ab8/pkg/util/wait/wait.go:153\nk8s.io/apimachinery/pkg/util/wait.Until\n\t/go/pkg/mod/k8s.io/apimachinery@v0.0.0-20191004115801-a2eda9f80ab8/pkg/util/wait/wait.go:88"}
{"level":"error","ts":1674011426.9368975,"logger":"controller-runtime.controller","msg":"Reconciler error","controller":"distributedrediscluster-controller","request":"default/example-distributedrediscluster","error":"DispatchMasters: split brain: drc-example-distributedrediscluster-2","stacktrace":"github.com/go-logr/zapr.(*zapLogger).Error\n\t/go/pkg/mod/github.com/go-logr/zapr@v0.1.1/zapr.go:128\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.4.0/pkg/internal/controller/controller.go:258\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.4.0/pkg/internal/controller/controller.go:232\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).worker\n\t/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.4.0/pkg/internal/controller/controller.go:211\nk8s.io/apimachinery/pkg/util/wait.JitterUntil.func1\n\t/go/pkg/mod/k8s.io/apimachinery@v0.0.0-20191004115801-a2eda9f80ab8/pkg/util/wait/wait.go:152\nk8s.io/apimachinery/pkg/util/wait.JitterUntil\n\t/go/pkg/mod/k8s.io/apimachinery@v0.0.0-20191004115801-a2eda9f80ab8/pkg/util/wait/wait.go:153\nk8s.io/apimachinery/pkg/util/wait.Until\n\t/go/pkg/mod/k8s.io/apimachinery@v0.0.0-20191004115801-a2eda9f80ab8/pkg/util/wait/wait.go:88"}
{"level":"info","ts":1674011426.9420218,"logger":"controller_distributedrediscluster","msg":"Reconciling DistributedRedisCluster","Request.Namespace":"default","Request.Name":"example-distributedrediscluster"}
{"level":"info","ts":1674011426.997737,"logger":"controller_distributedrediscluster","msg":">>>>>> clustering","Request.Namespace":"default","Request.Name":"example-distributedrediscluster"}

同样，Sentinel的Operator原理也是类似，不做过多重复描述

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