簡介：kn 是 Knative 命令行操作客戶端。 通過 kn 可以方便的操作Knative 相關(guān)的資源。

kn 是 Knative 命令行操作客戶端。 通過 kn 可以方便的操作Knative 相關(guān)的資源。

安裝 Kn

可以通過官方獲取對應(yīng)的 Kn 二進制
? macOS
? Linux
? Windows
kn 會與 kubectl 使用同樣的config 文件，默認(rèn)使用 $HOME/.kube/config

服務(wù)管理

使用 Kn 命令可以執(zhí)行： list, create, delete, apply, 和 update 操作Knative services.

創(chuàng)建服務(wù)

使用 create 命令:
kn service create
示例：

$ kn service create helloworld-go --env TARGET=knative --image registry.cn-hangzhou.aliyuncs.com/knative-sample/helloworld-go:73fbdd56 yuncs.com/knative-sample/helloworld-go:73fbdd56 Creating service 'helloworld-go' in namespace 'default':0.116s The Route is still working to reflect the latest desired specification.0.216s Configuration "helloworld-go" is waiting for a Revision to become ready.3.075s ...3.149s Ingress has not yet been reconciled.3.299s ...3.762s Ready to serve. Service 'helloworld-go' created to latest revision 'helloworld-go-pyqqz-1' is available at URL: http://helloworld-go.default.example.com

使用 apply 命令：
kn service apply
示例：

# Create an initial service with using 'kn service apply', if the service has not # been already created kn service apply s0 --image registry.cn-hangzhou.aliyuncs.com/knative-sample/helloworld-go:73fbdd56 # Apply the service again which is a no-operation if none of the options changed kn service apply s0 --image registry.cn-hangzhou.aliyuncs.com/knative-sample/helloworld-go:73fbdd56 # Add an environment variable to your service. Note, that you have to always fully # specify all parameters (in contrast to 'kn service update') kn service apply s0 --image registry.cn-hangzhou.aliyuncs.com/knative-sample/helloworld-go:73fbdd56 --env TARGET=knative # Read the service declaration from a file kn service apply s0 --filename my-svc.yml

查看服務(wù)

查詢服務(wù)列表示例：

kn service list NAME URL LATEST AGE CONDITIONS READY REASON helloworld-go http://helloworld-go.default.example.com helloworld-go-pyqqz-1 55s 3 OK / 3 True

查詢服務(wù)詳情示例：

kn service describe helloworld-go Name: helloworld-go Namespace: default Age: 14m URL: http://helloworld-go.default.example.com Revisions:100% @latest (helloworld-go-cvclp-2) [2](9m)Image: registry.cn-hangzhou.aliyuncs.com/knative-sample/helloworld-go:160e4dc8 (pinned to 032b80) Conditions:OK TYPE AGE REASON++ Ready 9m++ ConfigurationsReady 9m++ RoutesReady 9m

或者以 yaml 方式展示詳情：

$ kn service describe helloworld-go -oyaml apiVersion: serving.knative.dev/v1 kind: Service metadata:annotations:serving.knative.dev/creator: 1041208914252405-1606806762serving.knative.dev/lastModifier: 1041208914252405-1606806762creationTimestamp: "2020-12-09T06:07:41Z"generation: 2name: helloworld-gonamespace: defaultresourceVersion: "39555635"selfLink: /apis/serving.knative.dev/v1/namespaces/default/services/helloworld-gouid: 763e8214-7c2d-476c-bd88-40b32a30597d spec:template:metadata:annotations:client.knative.dev/user-image: registry.cn-hangzhou.aliyuncs.com/knative-sample/helloworld-go:160e4dc8creationTimestamp: nullname: helloworld-go-cvclp-2spec:containerConcurrency: 0containers:- env:- name: TARGETvalue: knativeimage: registry.cn-hangzhou.aliyuncs.com/knative-sample/helloworld-go:160e4dc8name: user-containerreadinessProbe:successThreshold: 1tcpSocket:port: 0resources: {}timeoutSeconds: 300traffic:- latestRevision: truepercent: 100 status:address:url: http://helloworld-go.default.svc.cluster.localconditions:- lastTransitionTime: "2020-12-09T06:13:33Z"status: "True"type: ConfigurationsReady- lastTransitionTime: "2020-12-09T06:13:34Z"status: "True"type: Ready- lastTransitionTime: "2020-12-09T06:13:34Z"status: "True"type: RoutesReadylatestCreatedRevisionName: helloworld-go-cvclp-2latestReadyRevisionName: helloworld-go-cvclp-2observedGeneration: 2traffic:- latestRevision: truepercent: 100revisionName: helloworld-go-cvclp-2url: http://helloworld-go.default.example.com

更新服務(wù)（創(chuàng)建新版本）

使用 update 命令：
kn service update NAME
示例：

$ kn service update helloworld-go --image registry.cn-hangzhou.aliyuncs.com/knative-sample/helloworld-go:160e4dc8 Updating Service 'helloworld-go' in namespace 'default':3.609s Traffic is not yet migrated to the latest revision.3.631s Ingress has not yet been reconciled.4.066s Ready to serve. Service 'helloworld-go' updated to latest revision 'helloworld-go-cvclp-2' is available at URL: http://helloworld-go.default.example.com

使用 apply 也可進行更新服務(wù)

kn service apply # Add an environment variable to your service. Note, that you have to always fully # specify all parameters (in contrast to 'kn service update') kn service apply s0 --image registry.cn-hangzhou.aliyuncs.com/knative-sample/helloworld-go:160e4dc8 --env TARGET=knative

刪除服務(wù)

示例：

kn service delete helloworld-go

版本管理

查看版本

kn revision list NAME SERVICE TRAFFIC TAGS GENERATION AGE CONDITIONS READY REASON helloworld-go-cvclp-2 helloworld-go 100% 2 40s 4 OK / 4 True helloworld-go-pyqqz-1 helloworld-go 1 6m29s 3 OK / 4 True

查看版本詳情

$ kn revision describe helloworld-go-cvclp-2 Name: helloworld-go-cvclp-2 Namespace: default Age: 3m Image: registry.cn-hangzhou.aliyuncs.com/knative-sample/helloworld-go:160e4dc8 (pinned to 032b80) Env: TARGET=knative Service: helloworld-go Conditions:OK TYPE AGE REASON++ Ready 3m++ ContainerHealthy 3m++ ResourcesAvailable 3mI Active 2m NoTraffic

刪除版本

$ kn revision delete helloworld-go-pyqqz-1 Revision 'helloworld-go-pyqqz-1' deleted in namespace 'default'.

其它

除了上面介紹的 service、revision。 Kn 還支持如下的資源操作, 有興趣的可以自己試用一下。
? kn broker - 管理事件 brokers
? kn channel - 管理事件 channels
? kn route - 管理服務(wù)路由 routes
? kn source - 管理事件源 sources
? kn trigger - 管理事件 triggers

原文鏈接：https://developer.aliyun.com/article/779806?

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