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Merge pull request #39532 from Zhuzhenghao/run-stateless 

Add syntax tag to highlight the command
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Kubernetes Prow Robot 2023-02-18 23:49:37 -08:00 committed by GitHub
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content/en/docs/tasks/run-application/run-stateless-application-deployment.md
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@ -9,27 +9,16 @@ weight: 10
This page shows how to run an application using a Kubernetes Deployment object.
## {{% heading "objectives" %}}
* Create an nginx deployment.
* Use kubectl to list information about the deployment.
* Update the deployment.
- Create an nginx deployment.
- Use kubectl to list information about the deployment.
- Update the deployment.
## {{% heading "prerequisites" %}}
{{< include "task-tutorial-prereqs.md" >}} {{< version-check >}}
<!-- lessoncontent -->
## Creating and exploring an nginx deployment
@ -40,60 +29,71 @@ a Deployment that runs the nginx:1.14.2 Docker image:
{{< codenew file="application/deployment.yaml" >}}
1. Create a Deployment based on the YAML file:
kubectl apply -f https://k8s.io/examples/application/deployment.yaml
```shell
kubectl apply -f https://k8s.io/examples/application/deployment.yaml
```
1. Display information about the Deployment:
kubectl describe deployment nginx-deployment
```shell
kubectl describe deployment nginx-deployment
```
The output is similar to this:
The output is similar to this:
Name: nginx-deployment
Namespace: default
CreationTimestamp: Tue, 30 Aug 2016 18:11:37 -0700
Labels: app=nginx
Annotations: deployment.kubernetes.io/revision=1
Selector: app=nginx
Replicas: 2 desired | 2 updated | 2 total | 2 available | 0 unavailable
StrategyType: RollingUpdate
MinReadySeconds: 0
RollingUpdateStrategy: 1 max unavailable, 1 max surge
Pod Template:
Labels: app=nginx
Containers:
nginx:
Image: nginx:1.14.2
Port: 80/TCP
Environment: <none>
Mounts: <none>
Volumes: <none>
Conditions:
Type Status Reason
---- ------ ------
Available True MinimumReplicasAvailable
Progressing True NewReplicaSetAvailable
OldReplicaSets: <none>
NewReplicaSet: nginx-deployment-1771418926 (2/2 replicas created)
No events.
```
Name: nginx-deployment
Namespace: default
CreationTimestamp: Tue, 30 Aug 2016 18:11:37 -0700
Labels: app=nginx
Annotations: deployment.kubernetes.io/revision=1
Selector: app=nginx
Replicas: 2 desired | 2 updated | 2 total | 2 available | 0 unavailable
StrategyType: RollingUpdate
MinReadySeconds: 0
RollingUpdateStrategy: 1 max unavailable, 1 max surge
Pod Template:
Labels: app=nginx
Containers:
nginx:
Image: nginx:1.14.2
Port: 80/TCP
Environment: <none>
Mounts: <none>
Volumes: <none>
Conditions:
Type Status Reason
---- ------ ------
Available True MinimumReplicasAvailable
Progressing True NewReplicaSetAvailable
OldReplicaSets: <none>
NewReplicaSet: nginx-deployment-1771418926 (2/2 replicas created)
No events.
```
1. List the Pods created by the deployment:
kubectl get pods -l app=nginx
```shell
kubectl get pods -l app=nginx
```
The output is similar to this:
The output is similar to this:
NAME READY STATUS RESTARTS AGE
nginx-deployment-1771418926-7o5ns 1/1 Running 0 16h
nginx-deployment-1771418926-r18az 1/1 Running 0 16h
```
NAME READY STATUS RESTARTS AGE
nginx-deployment-1771418926-7o5ns 1/1 Running 0 16h
nginx-deployment-1771418926-r18az 1/1 Running 0 16h
```
1. Display information about a Pod:
kubectl describe pod <pod-name>
```shell
kubectl describe pod <pod-name>
```
where `<pod-name>` is the name of one of your Pods.
where `<pod-name>` is the name of one of your Pods.
## Updating the deployment
@ -104,11 +104,15 @@ specifies that the deployment should be updated to use nginx 1.16.1.
1. Apply the new YAML file:
kubectl apply -f https://k8s.io/examples/application/deployment-update.yaml
```shell
kubectl apply -f https://k8s.io/examples/application/deployment-update.yaml
```
1. Watch the deployment create pods with new names and delete the old pods:
kubectl get pods -l app=nginx
```shell
kubectl get pods -l app=nginx
```
## Scaling the application by increasing the replica count
@ -120,25 +124,33 @@ should have four Pods:
1. Apply the new YAML file:
kubectl apply -f https://k8s.io/examples/application/deployment-scale.yaml
```shell
kubectl apply -f https://k8s.io/examples/application/deployment-scale.yaml
```
1. Verify that the Deployment has four Pods:
kubectl get pods -l app=nginx
```shell
kubectl get pods -l app=nginx
```
The output is similar to this:
The output is similar to this:
NAME READY STATUS RESTARTS AGE
nginx-deployment-148880595-4zdqq 1/1 Running 0 25s
nginx-deployment-148880595-6zgi1 1/1 Running 0 25s
nginx-deployment-148880595-fxcez 1/1 Running 0 2m
nginx-deployment-148880595-rwovn 1/1 Running 0 2m
```
NAME READY STATUS RESTARTS AGE
nginx-deployment-148880595-4zdqq 1/1 Running 0 25s
nginx-deployment-148880595-6zgi1 1/1 Running 0 25s
nginx-deployment-148880595-fxcez 1/1 Running 0 2m
nginx-deployment-148880595-rwovn 1/1 Running 0 2m
```
## Deleting a deployment
Delete the deployment by name:
kubectl delete deployment nginx-deployment
```shell
kubectl delete deployment nginx-deployment
```
## ReplicationControllers -- the Old Way
@ -147,14 +159,6 @@ which in turn uses a ReplicaSet. Before the Deployment and ReplicaSet were
added to Kubernetes, replicated applications were configured using a
[ReplicationController](/docs/concepts/workloads/controllers/replicationcontroller/).
## {{% heading "whatsnext" %}}
* Learn more about [Deployment objects](/docs/concepts/workloads/controllers/deployment/).
- Learn more about [Deployment objects](/docs/concepts/workloads/controllers/deployment/).