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Code snippents shouldn't include the command prompt (#12779)

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This commit is contained in:
Neha Yadav
2019-03-07 15:01:05 +05:30
committed by Kubernetes Prow Robot
parent 99e4d3bac6
commit d3cca48e3f
40 changed files with 1052 additions and 441 deletions
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content/en/docs/concepts/cluster-administration/manage-deployment.md
+83 -30
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@@ -26,7 +26,10 @@ Many applications require multiple resources to be created, such as a Deployment
Multiple resources can be created the same way as a single resource:
```shell
$ kubectl create -f https://k8s.io/examples/application/nginx-app.yaml
kubectl create -f https://k8s.io/examples/application/nginx-app.yaml
```
```shell
service/my-nginx-svc created
deployment.apps/my-nginx created
```
@@ -36,13 +39,13 @@ The resources will be created in the order they appear in the file. Therefore, i
`kubectl create` also accepts multiple `-f` arguments:
```shell
$ kubectl create -f https://k8s.io/examples/application/nginx/nginx-svc.yaml -f https://k8s.io/examples/application/nginx/nginx-deployment.yaml
kubectl create -f https://k8s.io/examples/application/nginx/nginx-svc.yaml -f https://k8s.io/examples/application/nginx/nginx-deployment.yaml
```
And a directory can be specified rather than or in addition to individual files:
```shell
$ kubectl create -f https://k8s.io/examples/application/nginx/
kubectl create -f https://k8s.io/examples/application/nginx/
```
`kubectl` will read any files with suffixes `.yaml`, `.yml`, or `.json`.
@@ -52,7 +55,10 @@ It is a recommended practice to put resources related to the same microservice o
A URL can also be specified as a configuration source, which is handy for deploying directly from configuration files checked into github:
```shell
$ kubectl create -f https://raw.githubusercontent.com/kubernetes/website/master/content/en/examples/application/nginx/nginx-deployment.yaml
kubectl create -f https://raw.githubusercontent.com/kubernetes/website/master/content/en/examples/application/nginx/nginx-deployment.yaml
```
```shell
deployment.apps/my-nginx created
```
@@ -61,7 +67,10 @@ deployment.apps/my-nginx created
Resource creation isn't the only operation that `kubectl` can perform in bulk. It can also extract resource names from configuration files in order to perform other operations, in particular to delete the same resources you created:
```shell
$ kubectl delete -f https://k8s.io/examples/application/nginx-app.yaml
kubectl delete -f https://k8s.io/examples/application/nginx-app.yaml
```
```shell
deployment.apps "my-nginx" deleted
service "my-nginx-svc" deleted
```
@@ -69,13 +78,16 @@ service "my-nginx-svc" deleted
In the case of just two resources, it's also easy to specify both on the command line using the resource/name syntax:
```shell
$ kubectl delete deployments/my-nginx services/my-nginx-svc
kubectl delete deployments/my-nginx services/my-nginx-svc
```
For larger numbers of resources, you'll find it easier to specify the selector (label query) specified using `-l` or `--selector`, to filter resources by their labels:
```shell
$ kubectl delete deployment,services -l app=nginx
kubectl delete deployment,services -l app=nginx
```
```shell
deployment.apps "my-nginx" deleted
service "my-nginx-svc" deleted
```
@@ -83,7 +95,10 @@ service "my-nginx-svc" deleted
Because `kubectl` outputs resource names in the same syntax it accepts, it's easy to chain operations using `$()` or `xargs`:
```shell
$ kubectl get $(kubectl create -f docs/concepts/cluster-administration/nginx/ -o name | grep service)
kubectl get $(kubectl create -f docs/concepts/cluster-administration/nginx/ -o name | grep service)
```
```shell
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
my-nginx-svc LoadBalancer 10.0.0.208 <pending> 80/TCP 0s
```
@@ -108,14 +123,20 @@ project/k8s/development
By default, performing a bulk operation on `project/k8s/development` will stop at the first level of the directory, not processing any subdirectories. If we had tried to create the resources in this directory using the following command, we would have encountered an error:
```shell
$ kubectl create -f project/k8s/development
kubectl create -f project/k8s/development
```
```shell
error: you must provide one or more resources by argument or filename (.json|.yaml|.yml|stdin)
```
Instead, specify the `--recursive` or `-R` flag with the `--filename,-f` flag as such:
```shell
$ kubectl create -f project/k8s/development --recursive
kubectl create -f project/k8s/development --recursive
```
```shell
configmap/my-config created
deployment.apps/my-deployment created
persistentvolumeclaim/my-pvc created
@@ -126,7 +147,10 @@ The `--recursive` flag works with any operation that accepts the `--filename,-f`
The `--recursive` flag also works when multiple `-f` arguments are provided:
```shell
$ kubectl create -f project/k8s/namespaces -f project/k8s/development --recursive
kubectl create -f project/k8s/namespaces -f project/k8s/development --recursive
```
```shell
namespace/development created
namespace/staging created
configmap/my-config created
@@ -169,8 +193,11 @@ and
The labels allow us to slice and dice our resources along any dimension specified by a label:
```shell
$ kubectl create -f examples/guestbook/all-in-one/guestbook-all-in-one.yaml
$ kubectl get pods -Lapp -Ltier -Lrole
kubectl create -f examples/guestbook/all-in-one/guestbook-all-in-one.yaml
kubectl get pods -Lapp -Ltier -Lrole
```
```shell
NAME READY STATUS RESTARTS AGE APP TIER ROLE
guestbook-fe-4nlpb 1/1 Running 0 1m guestbook frontend <none>
guestbook-fe-ght6d 1/1 Running 0 1m guestbook frontend <none>
@@ -180,7 +207,12 @@ guestbook-redis-slave-2q2yf 1/1 Running 0 1m guestboo
guestbook-redis-slave-qgazl 1/1 Running 0 1m guestbook backend slave
my-nginx-divi2 1/1 Running 0 29m nginx <none> <none>
my-nginx-o0ef1 1/1 Running 0 29m nginx <none> <none>
$ kubectl get pods -lapp=guestbook,role=slave
```
```shell
kubectl get pods -lapp=guestbook,role=slave
```
```shell
NAME READY STATUS RESTARTS AGE
guestbook-redis-slave-2q2yf 1/1 Running 0 3m
guestbook-redis-slave-qgazl 1/1 Running 0 3m
@@ -240,7 +272,10 @@ Sometimes existing pods and other resources need to be relabeled before creating
For example, if you want to label all your nginx pods as frontend tier, simply run:
```shell
$ kubectl label pods -l app=nginx tier=fe
kubectl label pods -l app=nginx tier=fe
```
```shell
pod/my-nginx-2035384211-j5fhi labeled
pod/my-nginx-2035384211-u2c7e labeled
pod/my-nginx-2035384211-u3t6x labeled
@@ -250,7 +285,9 @@ This first filters all pods with the label "app=nginx", and then labels them wit
To see the pods you just labeled, run:
```shell
$ kubectl get pods -l app=nginx -L tier
kubectl get pods -l app=nginx -L tier
```
```shell
NAME READY STATUS RESTARTS AGE TIER
my-nginx-2035384211-j5fhi 1/1 Running 0 23m fe
my-nginx-2035384211-u2c7e 1/1 Running 0 23m fe
@@ -266,8 +303,10 @@ For more information, please see [labels](/docs/concepts/overview/working-with-o
Sometimes you would want to attach annotations to resources. Annotations are arbitrary non-identifying metadata for retrieval by API clients such as tools, libraries, etc. This can be done with `kubectl annotate`. For example:
```shell
$ kubectl annotate pods my-nginx-v4-9gw19 description='my frontend running nginx'
$ kubectl get pods my-nginx-v4-9gw19 -o yaml
kubectl annotate pods my-nginx-v4-9gw19 description='my frontend running nginx'
kubectl get pods my-nginx-v4-9gw19 -o yaml
```
```shell
apiversion: v1
kind: pod
metadata:
@@ -283,14 +322,18 @@ For more information, please see [annotations](/docs/concepts/overview/working-w
When load on your application grows or shrinks, it's easy to scale with `kubectl`. For instance, to decrease the number of nginx replicas from 3 to 1, do:
```shell
$ kubectl scale deployment/my-nginx --replicas=1
kubectl scale deployment/my-nginx --replicas=1
```
```shell
deployment.extensions/my-nginx scaled
```
Now you only have one pod managed by the deployment.
```shell
$ kubectl get pods -l app=nginx
kubectl get pods -l app=nginx
```
```shell
NAME READY STATUS RESTARTS AGE
my-nginx-2035384211-j5fhi 1/1 Running 0 30m
```
@@ -298,7 +341,9 @@ my-nginx-2035384211-j5fhi 1/1 Running 0 30m
To have the system automatically choose the number of nginx replicas as needed, ranging from 1 to 3, do:
```shell
$ kubectl autoscale deployment/my-nginx --min=1 --max=3
kubectl autoscale deployment/my-nginx --min=1 --max=3
```
```shell
horizontalpodautoscaler.autoscaling/my-nginx autoscaled
```
@@ -320,7 +365,9 @@ Then, you can use [`kubectl apply`](/docs/reference/generated/kubectl/kubectl-co
This command will compare the version of the configuration that you're pushing with the previous version and apply the changes you've made, without overwriting any automated changes to properties you haven't specified.
```shell
$ kubectl apply -f https://k8s.io/examples/application/nginx/nginx-deployment.yaml
kubectl apply -f https://k8s.io/examples/application/nginx/nginx-deployment.yaml
```
```shell
deployment.apps/my-nginx configured
```
@@ -339,18 +386,20 @@ To use apply, always create resource initially with either `kubectl apply` or `k
Alternatively, you may also update resources with `kubectl edit`:
```shell
$ kubectl edit deployment/my-nginx
kubectl edit deployment/my-nginx
```
This is equivalent to first `get` the resource, edit it in text editor, and then `apply` the resource with the updated version:
```shell
$ kubectl get deployment my-nginx -o yaml > /tmp/nginx.yaml
$ vi /tmp/nginx.yaml
kubectl get deployment my-nginx -o yaml > /tmp/nginx.yaml
vi /tmp/nginx.yaml
# do some edit, and then save the file
$ kubectl apply -f /tmp/nginx.yaml
kubectl apply -f /tmp/nginx.yaml
deployment.apps/my-nginx configured
$ rm /tmp/nginx.yaml
rm /tmp/nginx.yaml
```
This allows you to do more significant changes more easily. Note that you can specify the editor with your `EDITOR` or `KUBE_EDITOR` environment variables.
@@ -370,7 +419,9 @@ and
In some cases, you may need to update resource fields that cannot be updated once initialized, or you may just want to make a recursive change immediately, such as to fix broken pods created by a Deployment. To change such fields, use `replace --force`, which deletes and re-creates the resource. In this case, you can simply modify your original configuration file:
```shell
$ kubectl replace -f https://k8s.io/examples/application/nginx/nginx-deployment.yaml --force
kubectl replace -f https://k8s.io/examples/application/nginx/nginx-deployment.yaml --force
```
```shell
deployment.apps/my-nginx deleted
deployment.apps/my-nginx replaced
```
@@ -385,14 +436,16 @@ you should read [how to use `kubectl rolling-update`](/docs/tasks/run-applicatio
Let's say you were running version 1.7.9 of nginx:
```shell
$ kubectl run my-nginx --image=nginx:1.7.9 --replicas=3
kubectl run my-nginx --image=nginx:1.7.9 --replicas=3
```
```shell
deployment.apps/my-nginx created
```
To update to version 1.9.1, simply change `.spec.template.spec.containers[0].image` from `nginx:1.7.9` to `nginx:1.9.1`, with the kubectl commands we learned above.
```shell
$ kubectl edit deployment/my-nginx
kubectl edit deployment/my-nginx
```
That's it! The Deployment will declaratively update the deployed nginx application progressively behind the scene. It ensures that only a certain number of old replicas may be down while they are being updated, and only a certain number of new replicas may be created above the desired number of pods. To learn more details about it, visit [Deployment page](/docs/concepts/workloads/controllers/deployment/).