Kubernetes生产实践系列之二十七：Kubernetes Operator之构建memcached operator并进行部署

ゞ浴缸里的玫瑰 2023-02-17 03:21 3阅读 0赞

## **一、前言** ##

在文章[《Kubernetes生产实践系列之二十六：Kubernetes Operator之Operator SDK开发环境构建》][Kubernetes_Kubernetes Operator_Operator SDK]中，对于Operator的基本原理和开发方法进行了介绍。其实在之前的文章[《Kubernetes生产实践系列之六：使用etcd-operator在Kubernetes部署 HA etcd集群》][Kubernetes_etcd-operator_Kubernetes_ HA etcd]和文章[《Kubernetes生产实践系列之十一：Kubernetes Mysql Operator方案对比》][Kubernetes_Kubernetes Mysql Operator]中，已经在生产环境中使用了Operator进行有状态的数据存储服务etcd和Mysql的交付：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nsb3VkdnRlY2g_size_16_color_FFFFFF_t_70][] ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nsb3VkdnRlY2g_size_16_color_FFFFFF_t_70 1][]

其实业界现在已经将Operator作为应用在Kubernetes进行标准化、自动化、规模化部署和交付事实标准，网站[https://operatorhub.io/][https_operatorhub.io]收集了大量的不同技术和业务方向的Operator，而网站[https://github.com/operator-framework/awesome-operators][https_github.com_operator-framework_awesome-operators]也列举了不少靠谱可用的Operator：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nsb3VkdnRlY2g_size_16_color_FFFFFF_t_70 2][][https://operatorhub.io/][https_operatorhub.io]

本文将根据例子构建一个memcached operator并进行部署：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nsb3VkdnRlY2g_size_16_color_FFFFFF_t_70 3][]

转载自https://blog.csdn.net/cloudvtech

## **二、构建Operator** ##

### 2.1 下载代码 ###

cd /root/gowork/src/
    
    git clone https://github.com/operator-framework/operator-sdk-samples.git
    cd /root/gowork/src/operator-sdk-samples/memcached-operator

### 2.2 修改部分代码逻辑 ###

Operator binary code

/root/gowork/src/operator-sdk-samples/memcached-operator/cmd/manager/main.go

Controller code

/root/gowork/src/memcached-operator/vendor/github.com/operator-framework/operator-sdk-samples/memcached-operator/pkg/controller/memcached/memcached_controller.go

### 2.3 构建 ###

export GOROOT=/usr/lib/golang
    export GOPATH=/root/gowork
    export GO111MODULE=off
    
    go get -u github.com/golang/dep/cmd/dep
    /root/gowork/bin/dep ensure -v
    
    
    export IMAGE=172.2.2.11:5000/memcached-operator:v0.3.1
    operator-sdk build $IMAGE --verbose --image-build-args --no-cache
    
    docker push $IMAGE

转载自https://blog.csdn.net/cloudvtech

## **三、部署Operator** ##

### 3.1 部署 ###

sed "s@REPLACE_IMAGE@$IMAGE@g" -i deploy/operator.yaml
    
    kubectl create ns $NAMESPACE
    kubectl create -f deploy/crds/cache_v1alpha1_memcached_crd.yaml -n $NAMESPACE
    kubectl create -f deploy/service_account.yaml -n $NAMESPACE
    kubectl create -f deploy/role.yaml -n $NAMESPACE
    kubectl create -f deploy/role_binding.yaml -n $NAMESPACE
    kubectl create -f deploy/operator.yaml -n $NAMESPACE

cache\_v1alpha1\_memcached\_crd.yaml

apiVersion: apiextensions.k8s.io/v1beta1
    kind: CustomResourceDefinition
    metadata:
      name: memcacheds.cache.example.com
    spec:
      group: cache.example.com
      names:
        kind: Memcached
        listKind: MemcachedList
        plural: memcacheds
        singular: memcached
      scope: Namespaced
      subresources:
        status: {}
      validation:
        openAPIV3Schema:
          description: Memcached is the Schema for the memcacheds 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/sig-architecture/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/sig-architecture/api-conventions.md#types-kinds'
              type: string
            metadata:
              type: object
            spec:
              description: MemcachedSpec defines the desired state of Memcached
              properties:
                size:
                  description: Size is the size of the memcached deployment
                  format: int32
                  type: integer
              required:
              - size
              type: object
            status:
              description: MemcachedStatus defines the observed state of Memcached
              properties:
                nodes:
                  description: Nodes are the names of the memcached pods
                  items:
                    type: string
                  type: array
                  x-kubernetes-list-type: set
              required:
              - nodes
              type: object
          type: object
      version: v1alpha1
      versions:
      - name: v1alpha1
        served: true
        storage: true

### 3.2 查看部署结果 ###

kubectl get pod -n $NAMESPACE
    NAME                                  READY   STATUS    RESTARTS   AGE
    memcached-operator-57f77b4bd8-dcp7v   1/1     Running   0          8s

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nsb3VkdnRlY2g_size_16_color_FFFFFF_t_70 4][]

转载自https://blog.csdn.net/cloudvtech

## **四、部署memcached集群** ##

### 4.1 部署 ###

kubectl apply -f cache_v1alpha1_memcached_cr.yaml -n $NAMESPACE

cache\_v1alpha1\_memcached\_cr.yaml

apiVersion: cache.example.com/v1alpha1
    kind: Memcached
    metadata:
      name: example-memcached
    spec:
      # Add fields here
      size: 3

### 4.2 Operator的日志 ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nsb3VkdnRlY2g_size_16_color_FFFFFF_t_70 5][]

### 4.3 修改集群部署参数增加replica：3->7 ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nsb3VkdnRlY2g_size_16_color_FFFFFF_t_70 6][]

转载自https://blog.csdn.net/cloudvtech

[Kubernetes_Kubernetes Operator_Operator SDK]: https://blog.csdn.net/cloudvtech/article/details/106696487
[Kubernetes_etcd-operator_Kubernetes_ HA etcd]: https://blog.csdn.net/cloudvtech/article/details/105605204
[Kubernetes_Kubernetes Mysql Operator]: https://blog.csdn.net/cloudvtech/article/details/105629201
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nsb3VkdnRlY2g_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200418221407800.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nsb3VkdnRlY2g=,size_16,color_FFFFFF,t_70
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[https_operatorhub.io]: https://operatorhub.io/
[https_github.com_operator-framework_awesome-operators]: https://github.com/operator-framework/awesome-operators
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nsb3VkdnRlY2g_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20200613112601168.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Nsb3VkdnRlY2g=,size_16,color_FFFFFF,t_70
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