文章目錄

通過OpenShift Console實現

部署並測試Hello的Serverless應用

說明

OpenShift Serverless Operator爲無服務器應用提供提供了Knative Serving的運行環境。需要以下兩步就可以在OpenShift上運行Knative應用：安裝所需的Operator和配置Knative Serving運行環境。

客戶端環境

從以下地址下載對應環境的OpenShift Client和Knative Client，然後將oc和kn配置到PATH中。

https://mirror.openshift.com/pub/openshift-v4/clients/oc/4.3/
https://mirror.openshift.com/pub/openshift-v4/clients/serverless/latest/

環境配置

我們可以用OpenShift控制檯或OpenShift命令行創建Knative及其所需的運行環境。下面分別介紹這兩種方法。

通過OpenShift Console實現

安裝OpenShift Serverless Operator

注意：通過OpenShift Console安裝OpenShift Serverless Operator時候，OpenShift會自動安裝OpenShift Serverless Operator所依賴的Service Mesh Opeator，因此Operator的安裝過程非常簡單。

用集羣管理員登錄OpenShift Console。
在Administrator視圖中進入Operators->OperatorHub，然後找到“OpenShift Serverless Operator”，點擊進入，最後在右滑窗口中接受所有缺省配置一直到完成即可。
完後上一步後，可以在控制檯中進入任意一個項目（例如default項目），可以在Operators->Installed Operators中看到以下Operators。此時就完成了OpenShift Serverless Operator安裝。

創建Knative Serving應用運行環境

Knative Serving提供了Serverless應用的支撐運行環境。Knative Serving必須運行在knative-serving項目中。

創建knative-serving項目。

$ oc new-project knative-serving

切換到knative-serving項目，再次進入Operators->Installed Operators，然後進入OpenShift Serverless Operator的配置。
在Overview頁面中點擊Knative Serving區域的Create Instance鏈接。
在Create KnativeServing界面中接受缺省配置，然後點擊Create。
然後進入名爲knative-serving的KnativeServing配置。需要等一段時間，直到下圖中4個狀態全部爲True，此時就成功創建了Knative Serving環境。
可以切換到knative-serving項目的Developer視圖，可以以下6個Deployment。

創建Knative Serving應用運行環境

創建knative-serving.yaml文件，內容爲以下部分：

apiVersion: v1
kind: Namespace
metadata:
  name: knative-serving
---
apiVersion: operator.knative.dev/v1alpha1
kind: KnativeServing
metadata:
  name: knative-serving
  namespace: knative-serving

執行命令創建項目和KnativeServing資源

$oc apply -f knative-serving.yaml

查看knative-serving的狀態，成功完成後顯示以下內容。

$ oc get knativeserving.operator.knative.dev/knative-serving -n knative-serving --template='{{range .status.conditions}}{{printf "%s =%s\n" .type .status}}{{end}}'
DependenciesInstalled=True
DeploymentsAvailable=True
InstallSucceeded=True
Ready=True

部署並測試Hello的Serverless應用

創建knative-demo項目。

$ oc new-project knative-demo

部署Knative的Hello應用。其中“–env TARGET=Knative”是將字符串傳給TARGET環境變量。

$ kn service create hello --image gcr.io/knative-samples/helloworld-go --env TARGET=Knative
Creating service 'hello' in namespace 'knative-demo':
 
  0.296s The Route is still working to reflect the latest desired specification.
  0.393s Configuration "hello" is waiting for a Revision to become ready.
 33.138s ...
 33.369s Ingress has not yet been reconciled.
 33.466s Configuration "hello" is waiting for a Revision to become ready.
 33.543s Ingress has not yet been reconciled.
 74.629s Ready to serve.
 
Service 'hello' created with latest revision 'hello-nvhqs-1' and URL:
http://hello.knative-demo.apps.cluster-shanghai-3d3e.shanghai-3d3e.example.opentlc.com

查看Knative的Service列表。

$ kn service list
NAME    URL                                                                                      LATEST          AGE    CONDITIONS   READY   REASON
hello   http://hello.knative-demo.apps.cluster-shanghai-3d3e.shanghai-3d3e.example.opentlc.com   hello-nvhqs-1   2m4s   3 OK / 3     True

查看knative-demo項目中的所有資源，其中包括Knative的configuration、service、revision、route對象，還有OpenShift的service、deployment、rs對象。注意：當前項目中還沒有pod資源。

$ oc get all -n knative-demo
NAME                            TYPE           CLUSTER-IP       EXTERNAL-IP                                                       PORT(S)                             AGE
service/hello                   ExternalName   <none>           cluster-local-gateway.knative-serving-ingress.svc.cluster.local   <none>                              10m
service/hello-nvhqs-1           ClusterIP      172.30.69.130    <none>                                                            80/TCP                              10m
service/hello-nvhqs-1-private   ClusterIP      172.30.125.146   <none>                                                            80/TCP,9090/TCP,9091/TCP,8022/TCP   10m
 
NAME                                       READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/hello-nvhqs-1-deployment   0/0     0            0           10m
 
NAME                                                  DESIRED   CURRENT   READY   AGE
replicaset.apps/hello-nvhqs-1-deployment-66db57b95f   0         0         0       10m
 
NAME                                         CONFIG NAME   K8S SERVICE NAME   GENERATION   READY   REASON
revision.serving.knative.dev/hello-nvhqs-1   hello         hello-nvhqs-1      1            True
 
NAME                                      LATESTCREATED   LATESTREADY     READY   REASON
configuration.serving.knative.dev/hello   hello-nvhqs-1   hello-nvhqs-1   True
 
NAME                              URL                                                                                      READY   REASON
route.serving.knative.dev/hello   http://hello.knative-demo.apps.cluster-shanghai-3d3e.shanghai-3d3e.example.opentlc.com   True
 
NAME                                URL                                                                                      LATESTCREATED   LATESTREADY     READY   REASON
service.serving.knative.dev/hello   http://hello.knative-demo.apps.cluster-shanghai-3d3e.shanghai-3d3e.example.opentlc.com   hello-nvhqs-1   hello-nvhqs-1   True

在OpenShift Console中進入knative-demo的Developer視圖，可以看到和hello應用相關的資源。
訪問hello應用的地址，確認可以返回“Hello Knative!”，其中“Knative”爲傳進去的環境變量。

$ curl http://hello.knative-demo.apps.cluster-shanghai-3d3e.shanghai-3d3e.example.opentlc.com
Hello Knative!

此時立即執行以下命令，確認此時可以查看項目在運行的Pod資源。不過在一分鐘以後會又看不到Pod了。

$ oc get pod
NAME                                          READY   STATUS    RESTARTS   AGE
pod/hello-rfgt4-1-deployment-a0cd0125-cfvny   2/2     Running   0          22s

更新名爲hello的service的環境變量內容。

$ kn service update hello --env TARGET=Kn
Updating Service 'hello' in namespace 'knative-demo':
 
 10.760s Traffic is not yet migrated to the latest revision.
 10.871s Ingress has not yet been reconciled.
 12.231s Ready to serve.
 
Service 'hello' updated with latest revision 'hello-cfvny-2' and URL:
http://hello.knative-demo.apps.cluster-shanghai-3d3e.shanghai-3d3e.example.opentlc.com

訪問hello應用的地址，確認可以返回結果已經變化。

$ curl http://hello.knative-demo.apps.cluster-shanghai-3d3e.shanghai-3d3e.example.opentlc.com
Hello Kn!

查看項目所有資源，確認OpenShift的deployment、rs對象和Knative的revision對象都已經有了一個新版的配置。

$ oc get all
NAME                                          READY   STATUS    RESTARTS   AGE
pod/hello-cfvny-2-deployment-d4cd7655-rfgt4   2/2     Running   0          22s
 
NAME                            TYPE           CLUSTER-IP       EXTERNAL-IP                                                       PORT(S)                             AGE
service/hello                   ExternalName   <none>           cluster-local-gateway.knative-serving-ingress.svc.cluster.local   <none>                              5h6m
service/hello-cfvny-2           ClusterIP      172.30.69.131    <none>                                                            80/TCP                              6m22s
service/hello-cfvny-2-private   ClusterIP      172.30.64.141    <none>                                                            80/TCP,9090/TCP,9091/TCP,8022/TCP   6m22s
service/hello-nvhqs-1           ClusterIP      172.30.69.130    <none>                                                            80/TCP                              5h6m
service/hello-nvhqs-1-private   ClusterIP      172.30.125.146   <none>                                                            80/TCP,9090/TCP,9091/TCP,8022/TCP   5h6m
  
NAME                                       READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/hello-cfvny-2-deployment   1/1     1            1           6m22s
deployment.apps/hello-nvhqs-1-deployment   0/0     0            0           5h6m
 
NAME                                                  DESIRED   CURRENT   READY   AGE
replicaset.apps/hello-cfvny-2-deployment-d4cd7655     1         1         1       6m22s
replicaset.apps/hello-nvhqs-1-deployment-66db57b95f   0         0         0       5h6m
 
NAME                                      LATESTCREATED   LATESTREADY     READY   REASON
configuration.serving.knative.dev/hello   hello-cfvny-2   hello-cfvny-2   True
  
NAME                                         CONFIG NAME   K8S SERVICE NAME   GENERATION   READY   REASON
revision.serving.knative.dev/hello-cfvny-2   hello         hello-cfvny-2      2            True
revision.serving.knative.dev/hello-nvhqs-1   hello         hello-nvhqs-1      1            True
 
NAME                                URL                                                                                      LATESTCREATED   LATESTREADY     READY   REASON
service.serving.knative.dev/hello   http://hello.knative-demo.apps.cluster-shanghai-3d3e.shanghai-3d3e.example.opentlc.com   hello-cfvny-2   hello-cfvny-2   True
 
NAME                              URL                                                                                      READY   REASON
route.serving.knative.dev/hello   http://hello.knative-demo.apps.cluster-shanghai-3d3e.shanghai-3d3e.example.opentlc.com   True

查看名爲hello的service詳細信息。確認最新的revision（hello-cfvny-2）接收了100%的請求。

$ kn service describe hello
Name:       hello
Namespace:  knative-demo
Age:        5h
URL:        http://hello.knative-demo.apps.cluster-shanghai-3d3e.shanghai-3d3e.example.opentlc.com
 
Revisions:
  100%  @latest (hello-cfvny-2) [2] (2m)
        Image:  gcr.io/knative-samples/helloworld-go (pinned to 5ea96b)
 
Conditions:
  OK TYPE                   AGE REASON
  ++ Ready                   2m
  ++ ConfigurationsReady     2m
  ++ RoutesReady             2m

查看Knative的revision對象。確認結果和（10）看到的項目包括的revision一樣。

$ kn revision list
NAME            SERVICE   GENERATION   AGE     CONDITIONS   READY   REASON
hello-cfvny-2   hello     2            45m     3 OK / 4     True
hello-nvhqs-1   hello     1            5h46m   3 OK / 4     True

執行命令，將請求平均發給以上2個revision。

$ kn service update hello --traffic @latest=50 --traffic hello-nvhqs-1=50
Updating Service 'hello' in namespace 'knative-demo':
 
  0.066s The Route is still working to reflect the latest desired specification.
  0.090s Ingress has not yet been reconciled.
  1.450s Ready to serve.
 
Service 'hello' updated with latest revision 'hello-cfvny-2' (unchanged) and URL:
http://hello.knative-demo.apps.cluster-shanghai-3d3e.shanghai-3d3e.example.opentlc.com

查看Knative的service對象，確認配置修改爲2個revision各自接收50%的請求。

$ kn service describe hello
Name:       hello
Namespace:  knative-demo
Age:        5h
URL:        http://hello.knative-demo.apps.cluster-shanghai-3d3e.shanghai-3d3e.example.opentlc.com
 
Revisions:
   50%  @latest (hello-cfvny-2) [2] (41m)
        Image:  gcr.io/knative-samples/helloworld-go (pinned to 5ea96b)
   50%  hello-nvhqs-1 [1] (5h)
        Image:  gcr.io/knative-samples/helloworld-go (pinned to 5ea96b)
 
Conditions:
  OK TYPE                   AGE REASON
  ++ Ready                   6m
  ++ ConfigurationsReady    41m
  ++ RoutesReady             6m

在OpenShift控制檯的Developer視圖中可以上可以看到hello應用的Toplogy。
點擊上圖的Set Traffic Distribution按鈕，可以在彈出窗口中可以爲不同的Revision分配流量比例。
多次訪問hello應用，確認返回結果部分是“Hello Knative!”、部分是“Hello Kn!”。

$ curl http://hello.knative-demo.apps.cluster-shanghai-3d3e.shanghai-3d3e.example.opentlc.com
Hello Knative!
$ curl http://hello.knative-demo.apps.cluster-shanghai-3d3e.shanghai-3d3e.example.opentlc.com
Hello Kn!

OpenShift 4.3 之Knative-Tutorial(1) 配置Serverless運行環境

文章目錄

說明

客戶端環境

環境配置

通過OpenShift Console實現

安裝OpenShift Serverless Operator

創建Knative Serving應用運行環境

創建Knative Serving應用運行環境

部署並測試Hello的Serverless應用

工作中用到的腳本合集

24-5-18 X

容器入門（1） - 安裝和使用Docker Registry

容器入門（3） - skopeo

OpenShift 4.3 - 基於虛擬機的BareMetal離線安裝（Shell說明）

OpenShift 4.3 - 基於虛擬機的BareMetal離線安裝（7-9）

容器入門（2） - podman

https://yachay.unat.edu.pe/blog/index.php?comment_area=format_blog&comment_component=blog&comment_co

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