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Conflicts: _data/tasks.yml _data/tutorials.yml docs/tasks/access-kubernetes-api/http-proxy-access-api.md docs/tasks/index.md docs/tutorials/index.md
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---
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---
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The Tutorials section of the Kubernetes documentation is a work in progress.
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#### Stateless Applications
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* [Running a Stateless Application Using a Deployment](/docs/tutorials/stateless-application/run-stateless-application-deployment/)
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* [Exposing an External IP Address Using a Service](/docs/tutorials/stateless-application/expose-external-ip-address-service/)
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### What's next
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If you would like to write a tutorial, see
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[Using Page Templates](/docs/contribute/page-templates/)
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for information about the tutorial page type and the tutorial template.
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apiVersion: extensions/v1beta1
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kind: Deployment
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metadata:
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name: nginx-deployment
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spec:
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replicas: 2
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template:
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metadata:
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labels:
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app: nginx
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spec:
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containers:
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- name: nginx
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image: nginx:1.8 # Update the version of nginx from 1.7.9 to 1.8
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ports:
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- containerPort: 80
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apiVersion: extensions/v1beta1
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kind: Deployment
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metadata:
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name: nginx-deployment
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spec:
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replicas: 2 # tells deployment to run 2 pods matching the template
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template: # create pods using pod definition in this template
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metadata:
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# unlike pod-nginx.yaml, the name is not included in the meta data as a unique name is
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# generated from the deployment name
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labels:
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app: nginx
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spec:
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containers:
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- name: nginx
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image: nginx:1.7.9
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ports:
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- containerPort: 80
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Contact GitHub API Training Shop Blog About
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---
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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 external
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clients can use to access an application running in a cluster. The
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Service exposes a stable IP address and provides load balancing for
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an application that has two running instances.
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{% endcapture %}
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{% capture prerequisites %}
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* Install [kubectl](http://kubernetes.io/docs/user-guide/prereqs).
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* Create a Kubernetes cluster, including a running Kubernetes
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API server. One way to create a new cluster is to use
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[Minikube](/docs/getting-started-guides/minikube).
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* Configure `kubectl` to communicate with your Kubernetes API server. This
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configuration is done automatically if you use Minikube.
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{% endcapture %}
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{% capture objectives %}
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* Run two 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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{% endcapture %}
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{% capture lessoncontent %}
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### Creating a service for an application running in two pods
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1. Run a Hello World application in your cluster:
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kubectl run hello-world --replicas=2 --labels="run=load-balancer-example" --image=gcr.io/google-samples/node-hello:1.0 --port=8080
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The preceding command creates a
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[Deployment](/docs/user-guide/deployments/)
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object and an associated
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[ReplicaSet](/docs/user-guide/replicasets/)
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object. The ReplicaSet has two
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[Pods](/docs/user-guide/pods/),
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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 the ReplicaSet:
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kubectl get replicasets hello-world
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kubectl describe replicasets hello-world
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1. List the pods that are running the Hello World application:
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kubectl get pods --selector="run=load-balancer-example"
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The output is similar to this:
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NAME READY STATUS RESTARTS AGE
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hello-world-2189936611-8fyp0 1/1 Running 0 6m
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hello-world-2189936611-9isq8 1/1 Running 0 6m
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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="example-service"
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1. Display the IP addresses for your service:
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kubectl get services example-service
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The output shows the internal IP address and the external IP address of
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your service. If the external IP address shows as `<pending>`, repeat the
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command.
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Note: If you are using Minikube, you don't get an external IP address. The
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external IP address remains in the pending state.
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NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
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example-service 10.0.0.160 <pending> 8080/TCP 40s
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1. Use your service to access the Hello World application:
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curl <your-external-ip-address>:8080
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where `<your-external-ip-address>` is the external IP address of your
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service.
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The output is a hello message from the application:
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Hello Kubernetes!
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Note: If you are using Minikube, enter these commands:
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kubectl cluster-info
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kubectl describe services example-service
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The output displays the IP address of your Minikube node and the NodePort
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value for your service. Enter this command to access the Hello World
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application:
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curl <minikube-node-ip-address>:<service-node-port>
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where `<minikube-node-ip-address>` us the IP address of your Minikube node,
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and `<service-node-port>` is the NodePort value for your service.
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### Using a service configuration file
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As an alternative to using `kubectl expose`, you can use a
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[service configuration file](/docs/user-guide/services/operations)
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to create a Service.
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{% endcapture %}
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{% capture cleanup %}
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To delete the Service, enter this command:
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kubectl delete services example-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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{% endcapture %}
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{% capture whatsnext %}
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Learn more about
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[connecting applications with services](/docs/user-guide/connecting-applications/).
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{% endcapture %}
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{% include templates/tutorial.md %}
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@@ -0,0 +1,114 @@
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---
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---
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{% capture overview %}
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This page shows how to run an application using a Kubernetes Deployment object.
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{% endcapture %}
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{% capture objectives %}
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* Create an nginx deployment.
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* Use kubectl to list information about the deployment.
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* Update the deployment.
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{% endcapture %}
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{% capture prerequisites %}
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* To do this tutorial, you need a Kubernetes cluster, including a running
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Kubernetes API server. You can use an existing cluster, or you can create a
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new cluster. One way to create a new cluster is to use
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[Minikube](/docs/getting-started-guides/minikube).
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* You also need to have `kubectl` installed on your local machine, and `kubectl`
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must be configured to communicate with your Kubernetes API server. This
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configuration is done automatically if you use Minikube.
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{% endcapture %}
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{% capture lessoncontent %}
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### Creating and exploring an nginx deployment
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You can run an application by creating a Kubernetes Deployment object, and you
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can describe a Deployment in a YAML file. For example, this YAML file describes
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a Deployment that runs the nginx:1.7.9 Docker image:
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{% include code.html language="yaml" file="deployment.yaml" ghlink="/docs/tutorials/stateless-application/deployment.yaml" %}
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1. Create a Deployment based on the YAML file:
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export REPO=https://raw.githubusercontent.com/kubernetes/kubernetes.github.io/master
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kubectl create -f $REPO/docs/tutorials/stateless-application/deployment.yaml
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1. Display information about the Deployment:
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kubectl describe deployment nginx-deployment
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user@computer:~/kubernetes.github.io$ kubectl describe deployment nginx-deployment
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Name: nginx-deployment
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Namespace: default
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CreationTimestamp: Tue, 30 Aug 2016 18:11:37 -0700
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Labels: app=nginx
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Selector: app=nginx
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Replicas: 2 updated | 2 total | 2 available | 0 unavailable
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StrategyType: RollingUpdate
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MinReadySeconds: 0
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RollingUpdateStrategy: 1 max unavailable, 1 max surge
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OldReplicaSets: <none>
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NewReplicaSet: nginx-deployment-1771418926 (2/2 replicas created)
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No events.
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1. List the pods created by the deployment:
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kubectl get pods -l app=nginx
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NAME READY STATUS RESTARTS AGE
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nginx-deployment-1771418926-7o5ns 1/1 Running 0 16h
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nginx-deployment-1771418926-r18az 1/1 Running 0 16h
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1. Display information about a pod:
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kubectl display pod <pod-name>
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where `<pod-name>` is the name of one of your pods.
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### Updating the deployment
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You can update the deployment by applying a new YAML file. This YAML file
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specifies that the deployment should be updated to use nginx 1.8.
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{% include code.html language="yaml" file="deployment-update.yaml" ghlink="/docs/tutorials/stateless-application/deployment-update.yaml" %}
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1. Apply the new YAML file:
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kubectl apply -f $REPO/docs/tutorials/stateless-application/deployment-update.yaml
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1. Watch the deployment create pods with new names and delete the old pods:
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kubectl get pods -l app=nginx
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### Deleting a deployment
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Delete the deployment by name:
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kubectl delete deployment nginx-deployment
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{% endcapture %}
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{% capture whatsnext %}
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* Learn more about [Deployment objects](/docs/user-guide/deployments/).
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* Learn more about [Deploying applications](/docs/user-guide/deploying-applications/)
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{% endcapture %}
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{% include templates/tutorial.md %}
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