鲁达 简介： kn 是 Knative 命令行操作客户端。 通过 kn 可以方便的操作Knative 相关的资源。
安装 Kn
可以通过官方获取对应的 Kn 二进制
• macOS
• Linux
• Windows
kn 会与 kubectl 使用同样的config 文件，默认使用 $HOME/.kube/config
服务管理
使用 Kn 命令可以执行： list, create, delete, apply, 和 update 操作Knative services.
创建服务
使用 create 命令:
kn service create
示例：
$ kn service create helloworld-go --env TARGET=knative --image regi 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: 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 regi # Apply the service again which is a no-operation if none of the options changed kn service apply s0 --image regi # 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 regi --env TARGET=knative # Read the service declaration from a file kn service apply s0 --filename my-查看服务
查询服务列表示例：
kn service list NAME URL LATEST AGE CONDITIONS READY REASON helloworld-go helloworld-go-pyqqz-1 55s 3 OK / 3 True查询服务详情示例：
kn service describe helloworld-go Name: helloworld-go Namespace: default Age: 14m URL: Revisions: 100% @latest (helloworld-go-cvclp-2) [2](9m) Image: regi (pinned to 032b80) Conditions: OK TYPE AGE REASON ++ Ready 9m ++ ConfigurationsReady 9m ++ RoutesReady 9m或者以 yaml 方式展示详情：
$ kn service describe helloworld-go -oyaml apiVersion: kind: Service metadata: annotations: : 1041208914252405-1606806762 : 1041208914252405-1606806762 creationTimestamp: "2020-12-09T06:07:41Z" generation: 2 name: helloworld-go namespace: default resourceVersion: "39555635" selfLink: /apis//namespaces/default/services/helloworld-go uid: 763e8214-7c2d-476c-bd88-40b32a30597d spec: template: metadata: annotations: client.knative.dev/user-image: regi creationTimestamp: null name: helloworld-go-cvclp-2 spec: containerConcurrency: 0 containers: - env: - name: TARGET value: knative image: regi name: user-container readinessProbe: successThreshold: 1 tcpSocket: port: 0 resources: {} timeoutSeconds: 300 traffic: - latestRevision: true percent: 100 status: address: url: conditions: - 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: RoutesReady latestCreatedRevisionName: helloworld-go-cvclp-2 latestReadyRevisionName: helloworld-go-cvclp-2 observedGeneration: 2 traffic: - latestRevision: true percent: 100 revisionName: helloworld-go-cvclp-2 url: 更新服务（创建新版本）
使用 update 命令：
kn service update NAME
示例：
$ kn service update helloworld-go --image regi 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: 使用 apply 也可进行更新服务
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 regi --env TARGET=knative删除服务
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查看版本详情
$ kn revision describe helloworld-go-cvclp-2 Name: helloworld-go-cvclp-2 Namespace: default Age: 3m Image: regi (pinned to 032b80) Env: TARGET=knative Service: helloworld-go Conditions: OK TYPE AGE REASON ++ Ready 3m ++ ContainerHealthy 3m ++ ResourcesAvailable 3m I Active 2m NoTraffic删除版本
$ kn revision delete helloworld-go-pyqqz-1 Revision 'helloworld-go-pyqqz-1' deleted in namespace 'default'.其它
除了上面介绍的 service、revision。 Kn 还支持如下的资源操作, 有兴趣的可以自己试用一下。
• kn broker - 管理事件 brokers
• kn channel - 管理事件 channels
• kn route - 管理服务路由 routes
• kn source - 管理事件源 sources
• kn trigger - 管理事件 triggers
作者：元毅
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