Copy from content/ja/docs/tutorials/stateless-application/
Signed-off-by: Takuma Hashimoto <takumaxd+github@gmail.com>pull/15672/head
Takuma Hashimoto
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---
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title: "ステートレスアプリケーション"
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weight: 40
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---
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---
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title: Exposing an External IP Address to Access an Application in a Cluster
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content_template: templates/tutorial
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weight: 10
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---
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{{% capture overview %}}
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This page shows how to create a Kubernetes Service object that exposes an
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external IP address.
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{{% /capture %}}
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{{% capture prerequisites %}}
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* Install [kubectl](/docs/tasks/tools/install-kubectl/).
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* Use a cloud provider like Google Kubernetes Engine or Amazon Web Services to
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create a Kubernetes cluster. This tutorial creates an
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[external load balancer](/docs/tasks/access-application-cluster/create-external-load-balancer/),
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which requires a cloud provider.
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* Configure `kubectl` to communicate with your Kubernetes API server. For
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instructions, see the documentation for your cloud provider.
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{{% /capture %}}
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{{% capture objectives %}}
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* Run five instances of a Hello World application.
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* Create a Service object that exposes an external IP address.
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* Use the Service object to access the running application.
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{{% /capture %}}
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{{% capture lessoncontent %}}
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## Creating a service for an application running in five pods
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1. Run a Hello World application in your cluster:
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{{< codenew file="service/load-balancer-example.yaml" >}}
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```shell
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kubectl apply -f https://k8s.io/examples/service/load-balancer-example.yaml
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```
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The preceding command creates a
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[Deployment](/docs/concepts/workloads/controllers/deployment/)
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object and an associated
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[ReplicaSet](/docs/concepts/workloads/controllers/replicaset/)
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object. The ReplicaSet has five
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[Pods](/docs/concepts/workloads/pods/pod/),
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each of which runs the Hello World application.
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1. Display information about the Deployment:
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kubectl get deployments hello-world
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kubectl describe deployments hello-world
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1. Display information about your ReplicaSet objects:
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kubectl get replicasets
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kubectl describe replicasets
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1. Create a Service object that exposes the deployment:
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kubectl expose deployment hello-world --type=LoadBalancer --name=my-service
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1. Display information about the Service:
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kubectl get services my-service
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The output is similar to this:
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NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
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my-service LoadBalancer 10.3.245.137 104.198.205.71 8080/TCP 54s
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Note: If the external IP address is shown as \<pending\>, wait for a minute
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and enter the same command again.
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1. Display detailed information about the Service:
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kubectl describe services my-service
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The output is similar to this:
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Name: my-service
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Namespace: default
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Labels: app.kubernetes.io/name=load-balancer-example
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Annotations: <none>
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Selector: app.kubernetes.io/name=load-balancer-example
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Type: LoadBalancer
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IP: 10.3.245.137
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LoadBalancer Ingress: 104.198.205.71
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Port: <unset> 8080/TCP
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NodePort: <unset> 32377/TCP
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Endpoints: 10.0.0.6:8080,10.0.1.6:8080,10.0.1.7:8080 + 2 more...
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Session Affinity: None
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Events: <none>
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Make a note of the external IP address (`LoadBalancer Ingress`) exposed by
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your service. In this example, the external IP address is 104.198.205.71.
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Also note the value of `Port` and `NodePort`. In this example, the `Port`
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is 8080 and the `NodePort` is 32377.
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1. In the preceding output, you can see that the service has several endpoints:
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10.0.0.6:8080,10.0.1.6:8080,10.0.1.7:8080 + 2 more. These are internal
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addresses of the pods that are running the Hello World application. To
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verify these are pod addresses, enter this command:
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kubectl get pods --output=wide
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The output is similar to this:
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NAME ... IP NODE
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hello-world-2895499144-1jaz9 ... 10.0.1.6 gke-cluster-1-default-pool-e0b8d269-1afc
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hello-world-2895499144-2e5uh ... 10.0.1.8 gke-cluster-1-default-pool-e0b8d269-1afc
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hello-world-2895499144-9m4h1 ... 10.0.0.6 gke-cluster-1-default-pool-e0b8d269-5v7a
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hello-world-2895499144-o4z13 ... 10.0.1.7 gke-cluster-1-default-pool-e0b8d269-1afc
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hello-world-2895499144-segjf ... 10.0.2.5 gke-cluster-1-default-pool-e0b8d269-cpuc
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1. Use the external IP address (`LoadBalancer Ingress`) to access the Hello
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World application:
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curl http://<external-ip>:<port>
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where `<external-ip>` is the external IP address (`LoadBalancer Ingress`)
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of your Service, and `<port>` is the value of `Port` in your Service
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description.
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If you are using minikube, typing `minikube service my-service` will
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automatically open the Hello World application in a browser.
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The response to a successful request is a hello message:
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Hello Kubernetes!
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{{% /capture %}}
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{{% capture cleanup %}}
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To delete the Service, enter this command:
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kubectl delete services my-service
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To delete the Deployment, the ReplicaSet, and the Pods that are running
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the Hello World application, enter this command:
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kubectl delete deployment hello-world
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{{% /capture %}}
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{{% capture whatsnext %}}
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Learn more about
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[connecting applications with services](/docs/concepts/services-networking/connect-applications-service/).
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{{% /capture %}}
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@ -0,0 +1,21 @@
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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labels:
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app.kubernetes.io/name: load-balancer-example
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name: hello-world
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spec:
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replicas: 5
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selector:
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matchLabels:
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app.kubernetes.io/name: load-balancer-example
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template:
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metadata:
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labels:
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app.kubernetes.io/name: load-balancer-example
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spec:
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containers:
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- image: gcr.io/google-samples/node-hello:1.0
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name: hello-world
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ports:
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- containerPort: 8080
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