在上篇文章中介绍了Operator SDK的安装和设定过程，这篇文章继续使用官方的示例来介绍一下如何使用Operator SDK进行Operator的创建和构建等过程。

事前准备

liumiaocn:~ liumiao$ which operator-sdk
/usr/local/bin/operator-sdk
liumiaocn:~ liumiao$ operator-sdk version
operator-sdk version: "v1.2.0", commit: "215fc50b2d4acc7d92b36828f42d7d1ae212015c", kubernetes version: "v1.18.8", go version: "go1.15.3", GOOS: "darwin", GOARCH: "amd64"
liumiaocn:~ liumiao$ go version
go version go1.15.5 darwin/amd64
liumiaocn:~ liumiao$

步骤1: init操作

执行命令：operator-sdk init --domain=example.com --repo=github.com/example-inc/memcached-operator

liumiaocn:~ liumiao$ mkdir memcached-operator
liumiaocn:~ liumiao$ cd memcached-operator/
liumiaocn:memcached-operator liumiao$ operator-sdk init --domain=example.com --repo=github.com/example-inc/memcached-operator
Writing scaffold for you to edit...
Get controller runtime:
$ go get sigs.k8s.io/controller-runtime@v0.6.3
go: downloading sigs.k8s.io/controller-runtime v0.6.3
...省略
go: downloading google.golang.org/appengine v1.5.0
Update go.mod:
$ go mod tidy
go: downloading go.uber.org/zap v1.10.0
...省略
go: downloading github.com/kr/text v0.1.0
Running make:
$ make
go: creating new go.mod: module tmp
...省略
/Users/liumiao/go/bin/controller-gen object:headerFile="hack/boilerplate.go.txt" paths="./..."
go fmt ./...
go vet ./...
go build -o bin/manager main.go
Next: define a resource with:
$ operator-sdk create api
liumiaocn:memcached-operator liumiao$

执行完毕，整体目录结构如下所示

liumiaocn:memcached-operator liumiao$ ls
Dockerfile  PROJECT     config      go.sum      main.go
Makefile    bin     go.mod      hack
liumiaocn:memcached-operator liumiao$ tree .
.
├── Dockerfile
├── Makefile
├── PROJECT
├── bin
│   └── manager
├── config
│   ├── certmanager
│   │   ├── certificate.yaml
│   │   ├── kustomization.yaml
│   │   └── kustomizeconfig.yaml
│   ├── default
│   │   ├── kustomization.yaml
│   │   ├── manager_auth_proxy_patch.yaml
│   │   ├── manager_webhook_patch.yaml
│   │   └── webhookcainjection_patch.yaml
│   ├── manager
│   │   ├── kustomization.yaml
│   │   └── manager.yaml
│   ├── prometheus
│   │   ├── kustomization.yaml
│   │   └── monitor.yaml
│   ├── rbac
│   │   ├── auth_proxy_client_clusterrole.yaml
│   │   ├── auth_proxy_role.yaml
│   │   ├── auth_proxy_role_binding.yaml
│   │   ├── auth_proxy_service.yaml
│   │   ├── kustomization.yaml
│   │   ├── leader_election_role.yaml
│   │   ├── leader_election_role_binding.yaml
│   │   └── role_binding.yaml
│   ├── scorecard
│   │   ├── bases
│   │   │   └── config.yaml
│   │   ├── kustomization.yaml
│   │   └── patches
│   │       ├── basic.config.yaml
│   │       └── olm.config.yaml
│   └── webhook
│       ├── kustomization.yaml
│       ├── kustomizeconfig.yaml
│       └── service.yaml
├── go.mod
├── go.sum
├── hack
│   └── boilerplate.go.txt
└── main.go12 directories, 34 files
liumiaocn:memcached-operator liumiao$

步骤2: 创建API

执行命令：operator-sdk create api --group cache --version v1 --kind Memcached --resource=true --controller=true

liumiaocn:memcached-operator liumiao$ operator-sdk create api --group cache --version v1 --kind Memcached --resource=true --controller=true
Writing scaffold for you to edit...
api/v1/memcached_types.go
controllers/memcached_controller.go
Running make:
$ make
go: creating new go.mod: module tmp
go: found sigs.k8s.io/controller-tools/cmd/controller-gen in sigs.k8s.io/controller-tools v0.3.0
/Users/liumiao/go/bin/controller-gen object:headerFile="hack/boilerplate.go.txt" paths="./..."
go fmt ./...
go vet ./...
go build -o bin/manager main.go
liumiaocn:memcached-operator liumiao$

步骤3: 构建镜像

执行命令：make docker-build IMG=liumiaocn/memcache:v1

liumiaocn:memcached-operator liumiao$ make docker-build IMG=liumiaocn/memcache:v1
go: creating new go.mod: module tmp
go: found sigs.k8s.io/controller-tools/cmd/controller-gen in sigs.k8s.io/controller-tools v0.3.0
/Users/liumiao/go/bin/controller-gen object:headerFile="hack/boilerplate.go.txt" paths="./..."
go fmt ./...
go vet ./...
/Users/liumiao/go/bin/controller-gen "crd:trivialVersions=true" rbac:roleName=manager-role webhook paths="./..." output:crd:artifacts:config=config/crd/bases
mkdir -p /Users/liumiao/memcached-operator/testbin
test -f /Users/liumiao/memcached-operator/testbin/setup-envtest.sh || curl -sSLo /Users/liumiao/memcached-operator/testbin/setup-envtest.sh https://raw.githubusercontent.com/kubernetes-sigs/controller-runtime/v0.6.3/hack/setup-envtest.sh
source /Users/liumiao/memcached-operator/testbin/setup-envtest.sh; fetch_envtest_tools /Users/liumiao/memcached-operator/testbin; setup_envtest_env /Users/liumiao/memcached-operator/testbin; go test ./... -coverprofile cover.out
fetching envtest tools@1.16.4 (into '/Users/liumiao/memcached-operator/testbin')
x bin/
x bin/etcd
x bin/kubectl
x bin/kube-apiserver
setting up env vars
?       github.com/example-inc/memcached-operator   [no test files]
?       github.com/example-inc/memcached-operator/api/v1    [no test files]
ok      github.com/example-inc/memcached-operator/controllers   6.020s  coverage: 0.0% of statements
docker build . -t liumiaocn/memcache:v1
Sending build context to Docker daemon  323.3MB
Step 1/14 : FROM golang:1.13 as builder
1.13: Pulling from library/golang
d6ff36c9ec48: Pull complete
c958d65b3090: Pull complete
edaf0a6b092f: Pull complete
80931cf68816: Pull complete
813643441356: Pull complete
799f41bb59c9: Pull complete
16b5038bccc8: Pull complete
Digest: sha256:8ebb6d5a48deef738381b56b1d4cd33d99a5d608e0d03c5fe8dfa3f68d41a1f8
Status: Downloaded newer image for golang:1.13---> d6f3656320fe
Step 2/14 : WORKDIR /workspace---> Running in eb0a5f21e3fe
Removing intermediate container eb0a5f21e3fe---> dbb6e3e63541
Step 3/14 : COPY go.mod go.mod---> 4ab6a945e245
Step 4/14 : COPY go.sum go.sum---> 293a4eec3dbb
Step 5/14 : RUN go mod download---> Running in d057c3fac1d5
go: finding cloud.google.com/go v0.38.0
go: finding github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78
...省略
go: finding sigs.k8s.io/yaml v1.2.0
Removing intermediate container d057c3fac1d5---> e83e6409c8f6
Step 6/14 : COPY main.go main.go---> 72236a1f1ba2
Step 7/14 : COPY api/ api/---> 2e8254e6e37e
Step 8/14 : COPY controllers/ controllers/---> 879e2f79eab2
Step 9/14 : RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 GO111MODULE=on go build -a -o manager main.go---> Running in ca5c33fa8fb0
Removing intermediate container ca5c33fa8fb0---> ab3a3a66312d
Step 10/14 : FROM gcr.io/distroless/static:nonroot
nonroot: Pulling from distroless/static
e59bd8947ac7: Already exists
Digest: sha256:dfabf95aa48990eec883b8b75462b1304678ebe9f36bdbca7841f5ddbd32af96
Status: Downloaded newer image for gcr.io/distroless/static:nonroot---> aa99000bc55d
Step 11/14 : WORKDIR /---> Running in 3913d069fe17
Removing intermediate container 3913d069fe17---> 3241720e1ab6
Step 12/14 : COPY --from=builder /workspace/manager .---> 4e2497bbc978
Step 13/14 : USER nonroot:nonroot---> Running in d55a63335b21
Removing intermediate container d55a63335b21---> 740854feb14e
Step 14/14 : ENTRYPOINT ["/manager"]---> Running in 5271112557de
Removing intermediate container 5271112557de---> 46e4c9af60d8
Successfully built 46e4c9af60d8
Successfully tagged liumiaocn/memcache:v1
liumiaocn:memcached-operator liumiao$

注：如果事前docker login设定完毕，可以直接执行make docker-build docker-push推送至镜像仓库中。

构建之后相关镜像信息如下所示：

liumiaocn:memcached-operator liumiao$ docker images |grep memcache
liumiaocn/memcache                                                   v1                                               46e4c9af60d8        6 minutes ago       46.5MB
liumiaocn:memcached-operator liumiao$

步骤4: 运行Operator

使用如下命令运行刚刚创建的Operator

执行命令：make install && make deploy IMG=liumiaocn/memcache:v1

liumiaocn:memcached-operator liumiao$ make install && make deploy IMG=liumiaocn/memcache:v1
go: creating new go.mod: module tmp
go: found sigs.k8s.io/controller-tools/cmd/controller-gen in sigs.k8s.io/controller-tools v0.3.0
/Users/liumiao/go/bin/controller-gen "crd:trivialVersions=true" rbac:roleName=manager-role webhook paths="./..." output:crd:artifacts:config=config/crd/bases
go: creating new go.mod: module tmp
go: downloading sigs.k8s.io/kustomize/kustomize/v3 v3.5.4
...省略
go: downloading github.com/konsorten/go-windows-terminal-sequences v1.0.1
/Users/liumiao/go/bin/kustomize build config/crd | kubectl apply -f -
customresourcedefinition.apiextensions.k8s.io/memcacheds.cache.example.com created
go: creating new go.mod: module tmp
go: found sigs.k8s.io/controller-tools/cmd/controller-gen in sigs.k8s.io/controller-tools v0.3.0
/Users/liumiao/go/bin/controller-gen "crd:trivialVersions=true" rbac:roleName=manager-role webhook paths="./..." output:crd:artifacts:config=config/crd/bases
go: creating new go.mod: module tmp
cd config/manager && /Users/liumiao/go/bin/kustomize edit set image controller=liumiaocn/memcache:v1
/Users/liumiao/go/bin/kustomize build config/default | kubectl apply -f -
namespace/memcached-operator-system created
customresourcedefinition.apiextensions.k8s.io/memcacheds.cache.example.com configured
role.rbac.authorization.k8s.io/memcached-operator-leader-election-role created
clusterrole.rbac.authorization.k8s.io/memcached-operator-manager-role created
clusterrole.rbac.authorization.k8s.io/memcached-operator-metrics-reader created
clusterrole.rbac.authorization.k8s.io/memcached-operator-proxy-role created
rolebinding.rbac.authorization.k8s.io/memcached-operator-leader-election-rolebinding created
clusterrolebinding.rbac.authorization.k8s.io/memcached-operator-manager-rolebinding created
clusterrolebinding.rbac.authorization.k8s.io/memcached-operator-proxy-rolebinding created
service/memcached-operator-controller-manager-metrics-service created
deployment.apps/memcached-operator-controller-manager created
liumiaocn:memcached-operator liumiao$

结果确认

liumiaocn:memcached-operator liumiao$ kubectl get service -A |grep memcache
memcached-operator-system   memcached-operator-controller-manager-metrics-service   ClusterIP   10.110.206.48   <none>        8443/TCP                 110s
liumiaocn:memcached-operator liumiao$ kubectl get pod -A |grep memcache
memcached-operator-system   memcached-operator-controller-manager-5df85cb9cb-fmcns   2/2     Running   0          119s
liumiaocn:memcached-operator liumiao$
liumiaocn:memcached-operator liumiao$ kubectl get deployment -A |grep memcache
memcached-operator-system   memcached-operator-controller-manager   1/1     1            1           2m13s
liumiaocn:memcached-operator liumiao$

crd确认

liumiaocn:memcached-operator liumiao$ kubectl get crds
NAME                           CREATED AT
memcacheds.cache.example.com   2020-11-24T06:32:57Z
liumiaocn:memcached-operator liumiao$

详细信息确认

liumiaocn:memcached-operator liumiao$ kubectl describe crd memcacheds.cache.example.com
Name:         memcacheds.cache.example.com
Namespace:
Labels:       <none>
Annotations:  controller-gen.kubebuilder.io/version: v0.3.0
API Version:  apiextensions.k8s.io/v1
Kind:         CustomResourceDefinition
Metadata:Creation Timestamp:  2020-11-24T06:32:57ZGeneration:          1Managed Fields:API Version:  apiextensions.k8s.io/v1Fields Type:  FieldsV1fieldsV1:f:status:f:acceptedNames:f:listKind:f:singular:Manager:      kube-apiserverOperation:    UpdateTime:         2020-11-24T06:32:57ZAPI Version:  apiextensions.k8s.io/v1beta1Fields Type:  FieldsV1fieldsV1:f:metadata:f:annotations:.:f:controller-gen.kubebuilder.io/version:f:kubectl.kubernetes.io/last-applied-configuration:f:spec:f:conversion:.:f:strategy:f:group:f:names:f:kind:f:listKind:f:plural:f:singular:f:preserveUnknownFields:f:scope:f:subresources:.:f:status:f:validation:.:f:openAPIV3Schema:.:f:description:f:properties:.:f:apiVersion:.:f:description:f:type:f:kind:.:f:description:f:type:f:metadata:.:f:type:f:spec:.:f:description:f:properties:.:f:foo:.:f:description:f:type:f:type:f:status:.:f:description:f:type:f:type:f:version:f:versions:f:status:f:acceptedNames:f:kind:f:plural:f:conditions:f:storedVersions:Manager:         kubectlOperation:       UpdateTime:            2020-11-24T06:33:00ZResource Version:  35707Self Link:         /apis/apiextensions.k8s.io/v1/customresourcedefinitions/memcacheds.cache.example.comUID:               9ca0a50d-797b-4361-b9e8-44ee46979cbd
Spec:Conversion:Strategy:  NoneGroup:       cache.example.comNames:Kind:                   MemcachedList Kind:              MemcachedListPlural:                 memcachedsSingular:               memcachedPreserve Unknown Fields:  trueScope:                    NamespacedVersions:Name:  v1Schema:openAPIV3Schema:Description:  Memcached is the Schema for the memcacheds APIProperties:API Version: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#resourcesType:         stringKind: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-kindsType:         stringMetadata:Type:  objectSpec:Description:  MemcachedSpec defines the desired state of MemcachedProperties:Foo:Description:  Foo is an example field of Memcached. Edit Memcached_types.go to remove/updateType:         stringType:             objectStatus:Description:  MemcachedStatus defines the observed state of MemcachedType:         objectType:             objectServed:               trueStorage:              trueSubresources:Status:
Status:Accepted Names:Kind:       MemcachedList Kind:  MemcachedListPlural:     memcachedsSingular:   memcachedConditions:Last Transition Time:  2020-11-24T06:32:57ZMessage:               no conflicts foundReason:                NoConflictsStatus:                TrueType:                  NamesAcceptedLast Transition Time:  2020-11-24T06:32:57ZMessage:               the initial names have been acceptedReason:                InitialNamesAcceptedStatus:                TrueType:                  EstablishedStored Versions:v1
Events:  <none>
liumiaocn:memcached-operator liumiao$

步骤5: 创建自定义资源

执行命令：kubectl apply -f config/samples/cache_v1_memcached.yaml

liumiaocn:memcached-operator liumiao$ kubectl apply -f config/samples/cache_v1_memcached.yaml
memcached.cache.example.com/memcached-sample created
liumiaocn:memcached-operator liumiao$

确认Operator相关日志信息

liumiaocn:memcached-operator liumiao$ kubectl logs deployment.apps/memcached-operator-controller-manager -n memcached-operator-system -c manager
2020-11-24T06:33:10.178Z    INFO    controller-runtime.metrics  metrics server is starting to listen    {"addr": "127.0.0.1:8080"}
2020-11-24T06:33:10.179Z    INFO    setup   starting manager
I1124 06:33:10.179468       1 leaderelection.go:242] attempting to acquire leader lease  memcached-operator-system/f1c5ece8.example.com...
2020-11-24T06:33:10.179Z    INFO    controller-runtime.manager  starting metrics server {"path": "/metrics"}
I1124 06:33:10.285304       1 leaderelection.go:252] successfully acquired lease memcached-operator-system/f1c5ece8.example.com
2020-11-24T06:33:10.286Z    INFO    controller  Starting EventSource    {"reconcilerGroup": "cache.example.com", "reconcilerKind": "Memcached", "controller": "memcached", "source": "kind source: /, Kind="}
2020-11-24T06:33:10.286Z    DEBUG   controller-runtime.manager.events   Normal  {"object": {"kind":"ConfigMap","namespace":"memcached-operator-system","name":"f1c5ece8.example.com","uid":"93c817f8-5a1b-46c3-a579-974425b59d14","apiVersion":"v1","resourceVersion":"35765"}, "reason": "LeaderElection", "message": "memcached-operator-controller-manager-5df85cb9cb-fmcns_db02b1d3-c780-42ab-99f1-56da6bcb7ed9 became leader"}
2020-11-24T06:33:10.387Z    INFO    controller  Starting Controller {"reconcilerGroup": "cache.example.com", "reconcilerKind": "Memcached", "controller": "memcached"}
2020-11-24T06:33:10.387Z    INFO    controller  Starting workers    {"reconcilerGroup": "cache.example.com", "reconcilerKind": "Memcached", "controller": "memcached", "worker count": 1}
2020-11-24T06:37:51.245Z    DEBUG   controller  Successfully Reconciled {"reconcilerGroup": "cache.example.com", "reconcilerKind": "Memcached", "controller": "memcached", "name": "memcached-sample", "namespace": "default"}
liumiaocn:memcached-operator liumiao$

步骤6: 删除CR和相关资源

执行命令：kubectl delete -f config/samples/cache_v1_memcached.yaml

liumiaocn:memcached-operator liumiao$ kubectl delete -f config/samples/cache_v1_memcached.yaml
memcached.cache.example.com "memcached-sample" deleted
liumiaocn:memcached-operator liumiao$ kubectl logs deployment.apps/memcached-operator-controller-manager -n memcached-operator-system -c manager
2020-11-24T06:33:10.178Z    INFO    controller-runtime.metrics  metrics server is starting to listen    {"addr": "127.0.0.1:8080"}
2020-11-24T06:33:10.179Z    INFO    setup   starting manager
I1124 06:33:10.179468       1 leaderelection.go:242] attempting to acquire leader lease  memcached-operator-system/f1c5ece8.example.com...
2020-11-24T06:33:10.179Z    INFO    controller-runtime.manager  starting metrics server {"path": "/metrics"}
I1124 06:33:10.285304       1 leaderelection.go:252] successfully acquired lease memcached-operator-system/f1c5ece8.example.com
2020-11-24T06:33:10.286Z    INFO    controller  Starting EventSource    {"reconcilerGroup": "cache.example.com", "reconcilerKind": "Memcached", "controller": "memcached", "source": "kind source: /, Kind="}
2020-11-24T06:33:10.286Z    DEBUG   controller-runtime.manager.events   Normal  {"object": {"kind":"ConfigMap","namespace":"memcached-operator-system","name":"f1c5ece8.example.com","uid":"93c817f8-5a1b-46c3-a579-974425b59d14","apiVersion":"v1","resourceVersion":"35765"}, "reason": "LeaderElection", "message": "memcached-operator-controller-manager-5df85cb9cb-fmcns_db02b1d3-c780-42ab-99f1-56da6bcb7ed9 became leader"}
2020-11-24T06:33:10.387Z    INFO    controller  Starting Controller {"reconcilerGroup": "cache.example.com", "reconcilerKind": "Memcached", "controller": "memcached"}
2020-11-24T06:33:10.387Z    INFO    controller  Starting workers    {"reconcilerGroup": "cache.example.com", "reconcilerKind": "Memcached", "controller": "memcached", "worker count": 1}
2020-11-24T06:37:51.245Z    DEBUG   controller  Successfully Reconciled {"reconcilerGroup": "cache.example.com", "reconcilerKind": "Memcached", "controller": "memcached", "name": "memcached-sample", "namespace": "default"}
2020-11-24T06:41:34.574Z    DEBUG   controller  Successfully Reconciled {"reconcilerGroup": "cache.example.com", "reconcilerKind": "Memcached", "controller": "memcached", "name": "memcached-sample", "namespace": "default"}
liumiaocn:memcached-operator liumiao$

最终的目录和文件结构如下所示

liumiaocn:memcached-operator liumiao$ pwd
/Users/liumiao/memcached-operator
liumiaocn:memcached-operator liumiao$ tree .
.
├── Dockerfile
├── Makefile
├── PROJECT
├── api
│   └── v1
│       ├── groupversion_info.go
│       ├── memcached_types.go
│       └── zz_generated.deepcopy.go
├── bin
│   └── manager
├── config
│   ├── certmanager
│   │   ├── certificate.yaml
│   │   ├── kustomization.yaml
│   │   └── kustomizeconfig.yaml
│   ├── crd
│   │   ├── bases
│   │   │   └── cache.example.com_memcacheds.yaml
│   │   ├── kustomization.yaml
│   │   ├── kustomizeconfig.yaml
│   │   └── patches
│   │       ├── cainjection_in_memcacheds.yaml
│   │       └── webhook_in_memcacheds.yaml
│   ├── default
│   │   ├── kustomization.yaml
│   │   ├── manager_auth_proxy_patch.yaml
│   │   ├── manager_webhook_patch.yaml
│   │   └── webhookcainjection_patch.yaml
│   ├── manager
│   │   ├── kustomization.yaml
│   │   └── manager.yaml
│   ├── prometheus
│   │   ├── kustomization.yaml
│   │   └── monitor.yaml
│   ├── rbac
│   │   ├── auth_proxy_client_clusterrole.yaml
│   │   ├── auth_proxy_role.yaml
│   │   ├── auth_proxy_role_binding.yaml
│   │   ├── auth_proxy_service.yaml
│   │   ├── kustomization.yaml
│   │   ├── leader_election_role.yaml
│   │   ├── leader_election_role_binding.yaml
│   │   ├── memcached_editor_role.yaml
│   │   ├── memcached_viewer_role.yaml
│   │   ├── role.yaml
│   │   └── role_binding.yaml
│   ├── samples
│   │   ├── cache_v1_memcached.yaml
│   │   └── kustomization.yaml
│   ├── scorecard
│   │   ├── bases
│   │   │   └── config.yaml
│   │   ├── kustomization.yaml
│   │   └── patches
│   │       ├── basic.config.yaml
│   │       └── olm.config.yaml
│   └── webhook
│       ├── kustomization.yaml
│       ├── kustomizeconfig.yaml
│       └── service.yaml
├── controllers
│   ├── memcached_controller.go
│   └── suite_test.go
├── cover.out
├── go.mod
├── go.sum
├── hack
│   └── boilerplate.go.txt
├── main.go
└── testbin├── bin│   ├── etcd│   ├── kube-apiserver│   └── kubectl└── setup-envtest.sh21 directories, 54 files
liumiaocn:memcached-operator liumiao$

总结

看似只是按照步骤创建了一系列的操作，实际上如果有真正进行CRD封装的经验的会了解这个过程中脚手架确实能帮助省去了很多精力，比如可以直接将精力放在生成的controller的实现之上。

参考内容

https://sdk.operatorframework.io/docs/building-operators/golang/quickstart/

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Operator基础：3: 使用Operator SDK创建Operator

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