使用operator-sdk 创新crd

安装operator-sdk

下载

RELEASE_VERSION=v0.11.0
curl -LO https://github.com/operator-framework/operator-sdk/releases/download/${RELEASE_VERSION}/operator-sdk-${RELEASE_VERSION}-x86_64-linux-gnu
curl -LO https://github.com/operator-framework/operator-sdk/releases/download/${RELEASE_VERSION}/operator-sdk-${RELEASE_VERSION}-x86_64-linux-gnu.asc
gpg --verify operator-sdk-${RELEASE_VERSION}-x86_64-linux-gnu.asc

如果本机没有安装公钥，会报错如下：

$ gpg --verify operator-sdk-${RELEASE_VERSION}-x86_64-apple-darwin.asc
$ gpg: assuming signed data in 'operator-sdk-${RELEASE_VERSION}-x86_64-apple-darwin'
$ gpg: Signature made Fri Apr  5 20:03:22 2019 CEST
$ gpg:                using RSA key <KEY_ID>
$ gpg: Can't check signature: No public key

执行如下脚本：

gpg --recv-key "$KEY_ID"
gpg --keyserver keyserver.ubuntu.com --recv-key "$KEY_ID"

安装

$ chmod +x operator-sdk-${RELEASE_VERSION}-x86_64-linux-gnu && sudo mkdir -p /usr/local/bin/ && sudo cp operator-sdk-${RELEASE_VERSION}-x86_64-linux-gnu /usr/local/bin/operator-sdk && rm operator-sdk-${RELEASE_VERSION}-x86_64-linux-gnu

创建新的工程

## 初始化工程
mkdir -p $GOPATH/example/
cd $GOPATH/example
export GO111MODULE=on
operator-sdk new cronjob-operator --repo github.com//ThinkBlue1991/cronjob-operator
cd cronjob-operator

## 添加CRD的api
operator-sdk add api --api-version=cache.example.com/v1alpha1 --kind=CronJob

定义Status和spec

• 修改pkg/apis/cache/v1alphal/cronjob_types.go
• 修改types后，针对resource进行更新和生成代码

operator-sdk generate k8s

openapi验证

operator-sdk generate openapi

查看deploy/crds/cache.example.com_cronjob_crd.yaml 其中根据spec定义了crd参数的属性

增加新的Controller

operator-sdk add controller --api-version=cache.example.com/v1alpha1 --kind=CronJob

会在pkg/controller/cronjob/下出现cronjob_controller.go文件 修改cronjob_controller.go文件，主要关心函数func (r *ReconcileMemcached) Reconcile(request reconcile.Request) (reconcile.Result, error)

编译运行operator

kubectl create -f deploy/crds/cache.example.com_cronjob_crd.yaml

operator-sdk build hub.geovis.io/zhangjx/cronjob-operator:v0.1
docker push hub.geovis.io/zhangjx/cronjob-operator:v0.1

Note: hub.geovis.io是本地的私有仓库；dockerhub:docker pull zhangjx1991/cronjobs:v0.1

修改operator.yaml文件

sed -i 's|REPLACE_IMAGE|hub.geovis.io/zhangjx/cronjob-operator:v0.1|g' deploy/operator.yaml

执行其他的yaml文件

# Setup Service Account
$ kubectl create -f deploy/service_account.yaml
# Setup RBAC 
$ kubectl create -f deploy/role.yaml
$ kubectl create -f deploy/role_binding.yaml
# Deploy the app-operator
$ kubectl create -f deploy/operator.yam

创建新的cronjob

kubectl create -f deploy/crds/cronjob.yaml

查看结果

crd

operator

job

Note:执行4次job任务，cronjob任务结束