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Merge branch 'master' into release-1.8

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steveperry-53
2017-08-07 08:56:51 -07:00
parent 0f1d4ce86e f16dfcf349
commit 4032cd08d7
30 changed files with 150 additions and 118 deletions
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docs/admin/bootstrap-tokens.md
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@@ -127,7 +127,7 @@ commands.
In addition to authentication, the tokens can be used to sign a ConfigMap. This
is used early in a cluster bootstrap process before the client trusts the API
server. The signed ConfigMap can be authenicated by the shared token.
server. The signed ConfigMap can be authenticated by the shared token.
The ConfigMap that is signed is `cluster-info` in the `kube-public` namespace.
The typical flow is that a client reads this ConfigMap while unauthenticated and
docs/concepts/architecture/nodes.md
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@@ -185,7 +185,7 @@ For self-registration, the kubelet is started with the following options:
- `--kubeconfig` - Path to credentials to authenticate itself to the apiserver.
- `--cloud-provider` - How to talk to a cloud provider to read metadata about itself.
- `--register-node` - Automatically register with the API server.
- `--register-with-taints` - Register the node with the given list of taints (comma seperated `<key>=<value>:<effect>`). No-op if `register-node` is false.
- `--register-with-taints` - Register the node with the given list of taints (comma separated `<key>=<value>:<effect>`). No-op if `register-node` is false.
- `--node-ip` IP address of the node.
- `--node-labels` - Labels to add when registering the node in the cluster.
- `--node-status-update-frequency` - Specifies how often kubelet posts node status to master.
docs/concepts/configuration/assign-pod-node.md
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@@ -293,7 +293,7 @@ Highly Available database statefulset has one master and three replicas, one may
|:--------------------:|:-------------------:|:------------------:|:------------------:|
| *DB-MASTER* | *DB-REPLICA-1* | *DB-REPLICA-2* | *DB-REPLICA-3* |
[Here](https://kubernetes.io/docs/tutorials/stateful-application/zookeeper/#tolerating-node-failure) is an example of zookeper statefulset configured with anti-affinity for high availablity.
[Here](https://kubernetes.io/docs/tutorials/stateful-application/zookeeper/#tolerating-node-failure) is an example of zookeper statefulset configured with anti-affinity for high availability.
For more information on inter-pod affinity/anti-affinity, see the design doc
[here](https://git.k8s.io/community/contributors/design-proposals/podaffinity.md).
docs/concepts/overview/working-with-objects/kubernetes-objects.md
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@@ -21,7 +21,7 @@ To work with Kubernetes objects--whether to create, modify, or delete them--you'
### Object Spec and Status
Every Kubernetes object includes two nested object fields that govern the object's configuration: the object *spec* and the object *status*. The *spec*, which you must provide, describes your *desired state* for the object--the characteristics that you want the object to have. The *status* describes the *actual state* for the object, and is supplied and updated by the Kubernetes system. At any given time, the Kubernetes Control Plane actively manages an object's actual state to match the desired state you supplied.
Every Kubernetes object includes two nested object fields that govern the object's configuration: the object *spec* and the object *status*. The *spec*, which you must provide, describes your *desired state* for the object--the characteristics that you want the object to have. The *status* describes the *actual state* of the object, and is supplied and updated by the Kubernetes system. At any given time, the Kubernetes Control Plane actively manages an object's actual state to match the desired state you supplied.
For example, a Kubernetes Deployment is an object that can represent an application running on your cluster. When you create the Deployment, you might set the Deployment spec to specify that you want three replicas of the application to be running. The Kubernetes system reads the Deployment spec and starts three instances of your desired application--updating the status to match your spec. If any of those instances should fail (a status change), the Kubernetes system responds to the difference between spec and status by making a correction--in this case, starting a replacement instance.
docs/concepts/overview/working-with-objects/labels.md
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@@ -40,7 +40,7 @@ These are just examples of commonly used labels; you are free to develop your ow
## Syntax and character set
_Labels_ are key value pairs. Valid label keys have two segments: an optional prefix and name, separated by a slash (`/`). The name segment is required and must be 63 characters or less, beginning and ending with an alphanumeric character (`[a-z0-9A-Z]`) with dashes (`-`), underscores (`_`), dots (`.`), and alphanumerics between. The prefix is optional. If specified, the prefix must be a DNS subdomain: a series of DNS labels separated by dots (`.`), not longer than 253 characters in total, followed by a slash (`/`).
If the prefix is omitted, the label key is presumed to be private to the user. Automated system components (e.g. `kube-scheduler`, `kube-controller-manager`, `kube-apiserver`, `kubectl`, or other third-party automation) which add labels to end-user objects must specify a prefix. The `kubernetes.io/` prefix is reserved for Kubernetes core components.
If the prefix is omitted, the label Key is presumed to be private to the user. Automated system components (e.g. `kube-scheduler`, `kube-controller-manager`, `kube-apiserver`, `kubectl`, or other third-party automation) which add labels to end-user objects must specify a prefix. The `kubernetes.io/` prefix is reserved for Kubernetes core components.
Valid label values must be 63 characters or less and must be empty or begin and end with an alphanumeric character (`[a-z0-9A-Z]`) with dashes (`-`), underscores (`_`), dots (`.`), and alphanumerics between.
docs/concepts/overview/working-with-objects/names.md
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@@ -15,4 +15,4 @@ Names are generally client-provided. Only one object of a given kind can have a
## UIDs
UID are generated by Kubernetes. Every object created over the whole lifetime of a Kubernetes cluster has a distinct UID (i.e., they are spatially and temporally unique).
UIDs are generated by Kubernetes. Every object created over the whole lifetime of a Kubernetes cluster has a distinct UID (i.e., they are spatially and temporally unique).
docs/concepts/services-networking/service.md
+24 -2
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@@ -435,7 +435,24 @@ In a split-horizon DNS environment you would need two services to be able to rou
This can be achieved by adding the following annotations to the service based on cloud provider.
For AWS:
{% capture default_tab %}
Select one of the tabs.
{% endcapture %}
{% capture gcp %}
```yaml
[...]
metadata:
name: my-service
annotations:
cloud.google.com/load-balancer-type: "internal"
[...]
```
For more information, see the [docs](https://cloud.google.com/container-engine/docs/internal-load-balancing).
{% endcapture %}
{% capture aws %}
```yaml
[...]
metadata:
@@ -444,8 +461,9 @@ metadata:
service.beta.kubernetes.io/aws-load-balancer-internal: 0.0.0.0/0
[...]
```
{% endcapture %}
For Azure:
{% capture azure %}
```yaml
[...]
metadata:
@@ -454,7 +472,11 @@ metadata:
service.beta.kubernetes.io/azure-load-balancer-internal: "true"
[...]
```
{% endcapture %}
{% assign tab_names = 'Default,GCP,AWS,Azure' | split: ',' | compact %}
{% assign tab_contents = site.emptyArray | push: default_tab | push: gcp | push: aws | push: azure %}
{% include tabs.md %}
#### SSL support on AWS
For partial SSL support on clusters running on AWS, starting with 1.3 two
docs/concepts/storage/volumes.md
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@@ -322,10 +322,10 @@ See the [iSCSI example](https://github.com/kubernetes/kubernetes/tree/{{page.git
### fc (fibre channel)
An `fc` volume allows an existing fibre channel volume to be mounted into your pod.
You can specify single or multiple target World Wide Names to the parameter
targetWWNs in your volume configuration. If multiple WWNs are specified,
targetWWNs expects that those WWNs form multipath connection.
An `fc` volume allows an existing fibre channel volume to be mounted in a pod.
You can specify single or multiple target World Wide Names using the parameter
`targetWWNs` in your volume configuration. If multiple WWNs are specified,
targetWWNs expect that those WWNs are from multi-path connections.
__Important: You must configure FC SAN Zoning to allocate and mask those
LUNs (volumes) to the target WWNs beforehand so that Kubernetes hosts
@@ -693,7 +693,7 @@ spec:
fsType: xfs
```
For further detail, plese the see the [ScaleIO examples](https://github.com/kubernetes/kubernetes/tree/{{page.githubbranch}}/examples/volumes/scaleio).
For further detail, please the see the [ScaleIO examples](https://github.com/kubernetes/kubernetes/tree/{{page.githubbranch}}/examples/volumes/scaleio).
### StorageOS
A `storageos` volume allows an existing [StorageOS](https://www.storageos.com) volume to be mounted into your pod.
docs/home/contribute/style-guide.md
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@@ -46,7 +46,7 @@ represents.
1. Display information about a pod:
kubectl describe pod <pod-name>
kubectl describe pod <pod-name>
where `<pod-name>` is the name of one of your pods.
docs/tasks/access-application-cluster/load-balance-access-application-cluster.md
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@@ -32,11 +32,11 @@ load-balanced access to an application running in a cluster.
1. Run a Hello World application in your cluster:
kubectl run hello-world --replicas=2 --labels="run=load-balancer-example" --image=gcr.io/google-samples/node-hello:1.0 --port=8080
kubectl run hello-world --replicas=2 --labels="run=load-balancer-example" --image=gcr.io/google-samples/node-hello:1.0 --port=8080
1. List the pods that are running the Hello World application:
kubectl get pods --selector="run=load-balancer-example"
kubectl get pods --selector="run=load-balancer-example"
The output is similar to this:
@@ -46,7 +46,7 @@ load-balanced access to an application running in a cluster.
1. List the replica set for the two Hello World pods:
kubectl get replicasets --selector="run=load-balancer-example"
kubectl get replicasets --selector="run=load-balancer-example"
The output is similar to this:
@@ -55,13 +55,13 @@ load-balanced access to an application running in a cluster.
1. Create a Service object that exposes the replica set:
kubectl expose rs <your-replica-set-name> --type="LoadBalancer" --name="example-service"
kubectl expose rs <your-replica-set-name> --type="LoadBalancer" --name="example-service"
where `<your-replica-set-name>` is the name of your replica set.
1. Display the IP addresses for your service:
kubectl get services example-service
kubectl get services example-service
The output shows the internal IP address and the external IP address of
your service. If the external IP address shows as `<pending>`, repeat the
@@ -86,8 +86,8 @@ load-balanced access to an application running in a cluster.
Note: If you are using Minikube, enter these commands:
kubectl cluster-info
kubectl describe services example-service
kubectl cluster-info
kubectl describe services example-service
The output displays the IP address of your Minikube node and the NodePort
value for your service. Then enter this command to access the Hello World
docs/tasks/access-application-cluster/port-forward-access-application-cluster.md
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@@ -26,7 +26,7 @@ for database debugging.
1. Create a pod:
kubectl create -f https://k8s.io/docs/tasks/access-application-cluster/redis-master.yaml
kubectl create -f https://k8s.io/docs/tasks/access-application-cluster/redis-master.yaml
The output of a successful command verifies that the pod was created:
@@ -34,7 +34,7 @@ for database debugging.
1. Check to see whether the pod is running and ready:
kubectl get pods
kubectl get pods
When the pod is ready, the output displays a STATUS of Running:
@@ -44,7 +44,7 @@ for database debugging.
1. Verify that the Redis server is running in the pod and listening on port 6379:
{% raw %}
kubectl get pods redis-master --template='{{(index (index .spec.containers 0).ports 0).containerPort}}{{"\n"}}'
kubectl get pods redis-master --template='{{(index (index .spec.containers 0).ports 0).containerPort}}{{"\n"}}'
{% endraw %}
The output displays the port:
@@ -55,7 +55,7 @@ for database debugging.
1. Forward port 6379 on the local workstation to port 6379 of redis-master pod:
kubectl port-forward redis-master 6379:6379
kubectl port-forward redis-master 6379:6379
The output is similar to this:
docs/tasks/access-application-cluster/service-access-application-cluster.md
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@@ -33,7 +33,7 @@ provides load balancing for an application that has two running instances.
1. Run a Hello World application in your cluster:
kubectl run hello-world --replicas=2 --labels="run=load-balancer-example" --image=gcr.io/google-samples/node-hello:1.0 --port=8080
kubectl run hello-world --replicas=2 --labels="run=load-balancer-example" --image=gcr.io/google-samples/node-hello:1.0 --port=8080
The preceding command creates a
[Deployment](/docs/concepts/workloads/controllers/deployment/)
@@ -45,21 +45,21 @@ provides load balancing for an application that has two running instances.
1. Display information about the Deployment:
kubectl get deployments hello-world
kubectl describe deployments hello-world
kubectl get deployments hello-world
kubectl describe deployments hello-world
1. Display information about your ReplicaSet objects:
kubectl get replicasets
kubectl describe replicasets
kubectl get replicasets
kubectl describe replicasets
1. Create a Service object that exposes the deployment:
kubectl expose deployment hello-world --type=NodePort --name=example-service
kubectl expose deployment hello-world --type=NodePort --name=example-service
1. Display information about the Service:
kubectl describe services example-service
kubectl describe services example-service
The output is similar to this:
@@ -80,7 +80,7 @@ provides load balancing for an application that has two running instances.
1. List the pods that are running the Hello World application:
kubectl get pods --selector="run=load-balancer-example" --output=wide
kubectl get pods --selector="run=load-balancer-example" --output=wide
The output is similar to this:
docs/tasks/access-kubernetes-api/http-proxy-access-api.md
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@@ -13,7 +13,7 @@ This page shows how to use an HTTP proxy to access the Kubernetes API.
* If you do not already have an application running in your cluster, start
a Hello world application by entering this command:
kubectl run node-hello --image=gcr.io/google-samples/node-hello:1.0 --port=8080
kubectl run node-hello --image=gcr.io/google-samples/node-hello:1.0 --port=8080
{% endcapture %}
docs/tasks/administer-cluster/change-default-storage-class.md
+4 -4
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@@ -38,7 +38,7 @@ for details about addon manager and how to disable individual addons.
1. List the StorageClasses in your cluster:
kubectl get storageclass
kubectl get storageclass
The output is similar to this:
@@ -56,7 +56,7 @@ for details about addon manager and how to disable individual addons.
To mark a StorageClass as non-default, you need to change its value to `false`:
kubectl patch storageclass <your-class-name> -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"false"}}}'
kubectl patch storageclass <your-class-name> -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"false"}}}'
where `<your-class-name>` is the name of your chosen StorageClass.
@@ -65,7 +65,7 @@ for details about addon manager and how to disable individual addons.
Similarly to the previous step, you need to add/set the annotation
`storageclass.kubernetes.io/is-default-class=true`.
kubectl patch storageclass <your-class-name> -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'
kubectl patch storageclass <your-class-name> -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'
Please note that at most one StorageClass can be marked as default. If two
or more of them are marked as default, Kubernetes ignores the annotation,
@@ -73,7 +73,7 @@ for details about addon manager and how to disable individual addons.
1. Verify that your chosen StorageClass is default:
kubectl get storageclass
kubectl get storageclass
The output is similar to this:
docs/tasks/administer-cluster/change-pv-reclaim-policy.md
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@@ -31,7 +31,7 @@ the corresponding `PersistentVolume` is not be deleted. Instead, it is moved to
1. List the PersistentVolumes in your cluster:
kubectl get pv
kubectl get pv
The output is similar to this:
@@ -45,13 +45,13 @@ the corresponding `PersistentVolume` is not be deleted. Instead, it is moved to
1. Chose one of your PersistentVolumes and change its reclaim policy:
kubectl patch pv <your-pv-name> -p '{"spec":{"persistentVolumeReclaimPolicy":"Retain"}}'
kubectl patch pv <your-pv-name> -p '{"spec":{"persistentVolumeReclaimPolicy":"Retain"}}'
where `<your-pv-name>` is the name of your chosen PersistentVolume.
1. Verify that your chosen PersistentVolume has the right policy:
kubectl get pv
kubectl get pv
The output is similar to this:
docs/tasks/configure-pod-container/assign-cpu-ram-container.md
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@@ -45,11 +45,11 @@ for the `Pod`:
1. Create a Pod based on the YAML configuration file:
kubectl create -f https://k8s.io/docs/tasks/configure-pod-container/cpu-ram.yaml
kubectl create -f https://k8s.io/docs/tasks/configure-pod-container/cpu-ram.yaml
1. Display information about the pod:
kubectl describe pod cpu-ram-demo
kubectl describe pod cpu-ram-demo
The output is similar to this:
docs/tasks/configure-pod-container/assign-pods-nodes.md
+5 -5
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@@ -19,7 +19,7 @@ Kubernetes cluster.
1. List the nodes in your cluster:
kubectl get nodes
kubectl get nodes
The output is similar to this:
@@ -30,13 +30,13 @@ Kubernetes cluster.
1. Chose one of your nodes, and add a label to it:
kubectl label nodes <your-node-name> disktype=ssd
kubectl label nodes <your-node-name> disktype=ssd
where `<your-node-name>` is the name of your chosen node.
1. Verify that your chosen node has a `disktype=ssd` label:
kubectl get nodes --show-labels
kubectl get nodes --show-labels
The output is similar to this:
@@ -60,11 +60,11 @@ a `disktype=ssd` label.
1. Use the configuration file to create a pod that will get scheduled on your
chosen node:
kubectl create -f https://k8s.io/docs/tasks/configure-pod-container/pod.yaml
kubectl create -f https://k8s.io/docs/tasks/configure-pod-container/pod.yaml
1. Verify that the pod is running on your chosen node:
kubectl get pods --output=wide
kubectl get pods --output=wide
The output is similar to this:
docs/tasks/configure-pod-container/configure-projected-volume-storage.md
+10 -10
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@@ -24,22 +24,22 @@ Here is the configuration file for the Pod:
1. Create the Secrets:
# Create files containing the username and password:
echo -n "admin" > ./username.txt
echo -n "1f2d1e2e67df" > ./password.txt
# Create files containing the username and password:
echo -n "admin" > ./username.txt
echo -n "1f2d1e2e67df" > ./password.txt
# Package these files into secrets:
kubectl create secret generic user --from-file=./username.txt
kubectl create secret generic pass --from-file=./password.txt
# Package these files into secrets:
kubectl create secret generic user --from-file=./username.txt
kubectl create secret generic pass --from-file=./password.txt
1. Create the Pod:
kubectl create -f projected-volume.yaml
kubectl create -f projected-volume.yaml
1. Verify that the Pod's Container is running, and then watch for changes to
the Pod:
kubectl get --watch pod test-projected-volume
kubectl get --watch pod test-projected-volume
The output looks like this:
@@ -48,11 +48,11 @@ the Pod:
1. In another terminal, get a shell to the running Container:
kubectl exec -it test-projected-volume -- /bin/sh
kubectl exec -it test-projected-volume -- /bin/sh
1. In your shell, verify that the `projected-volume` directory contains your projected sources:
/ # ls /projected-volume/
/ # ls /projected-volume/
{% endcapture %}
{% capture whatsnext %}
docs/tasks/debug-application-cluster/audit.md
+1 -1
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@@ -73,7 +73,7 @@ the [kube-apiserver][kube-apiserver]:
--feature-gates=AdvancedAuditing=true
```
`AdvancedAuditing`is customizeable in two ways. Policy, which determines what's recorded,
`AdvancedAuditing`is customizable in two ways. Policy, which determines what's recorded,
and backends, which persist records. Backend implementations include logs files and
webhooks.
docs/tasks/debug-application-cluster/debug-pod-replication-controller.md
+2 -2
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@@ -45,8 +45,8 @@ case you can try several things:
command. Here are some example command lines that extract just the necessary
information:
kubectl get nodes -o yaml | grep '\sname\|cpu\|memory'
kubectl get nodes -o json | jq '.items[] | {name: .metadata.name, cap: .status.capacity}'
kubectl get nodes -o yaml | grep '\sname\|cpu\|memory'
kubectl get nodes -o json | jq '.items[] | {name: .metadata.name, cap: .status.capacity}'
The [resource quota](/docs/concepts/policy/resource-quotas/)
feature can be configured to limit the total amount of
docs/tasks/debug-application-cluster/determine-reason-pod-failure.md
+3 -3
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@@ -37,7 +37,7 @@ the container starts.
1. Create a Pod based on the YAML configuration file:
kubectl create -f https://k8s.io/docs/tasks/debug-application-cluster/termination.yaml
kubectl create -f https://k8s.io/docs/tasks/debug-application-cluster/termination.yaml
In the YAML file, in the `cmd` and `args` fields, you can see that the
container sleeps for 10 seconds and then writes "Sleep expired" to
@@ -46,13 +46,13 @@ the container starts.
1. Display information about the Pod:
kubectl get pod termination-demo
kubectl get pod termination-demo
Repeat the preceding command until the Pod is no longer running.
1. Display detailed information about the Pod:
kubectl get pod --output=yaml
kubectl get pod --output=yaml
The output includes the "Sleep expired" message:
docs/tasks/inject-data-application/define-command-argument-container.md
+3 -3
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@@ -39,11 +39,11 @@ file for the Pod defines a command and two arguments:
1. Create a Pod based on the YAML configuration file:
kubectl create -f https://k8s.io/docs/tasks/inject-data-application/commands.yaml
kubectl create -f https://k8s.io/docs/tasks/inject-data-application/commands.yaml
1. List the running Pods:
kubectl get pods
kubectl get pods
The output shows that the container that ran in the command-demo Pod has
completed.
@@ -51,7 +51,7 @@ file for the Pod defines a command and two arguments:
1. To see the output of the command that ran in the container, view the logs
from the Pod:
kubectl logs command-demo
kubectl logs command-demo
The output shows the values of the HOSTNAME and KUBERNETES_PORT environment
variables:
docs/tasks/inject-data-application/define-environment-variable-container.md
+3 -3
View File
@@ -34,11 +34,11 @@ Pod:
1. Create a Pod based on the YAML configuration file:
kubectl create -f https://k8s.io/docs/tasks/inject-data-application/envars.yaml
kubectl create -f https://k8s.io/docs/tasks/inject-data-application/envars.yaml
1. List the running Pods:
kubectl get pods -l purpose=demonstrate-envars
kubectl get pods -l purpose=demonstrate-envars
The output is similar to this:
@@ -47,7 +47,7 @@ Pod:
1. Get a shell to the container running in your Pod:
kubectl exec -it envar-demo -- /bin/bash
kubectl exec -it envar-demo -- /bin/bash
1. In your shell, run the `printenv` command to list the environment variables.
docs/tasks/inject-data-application/distribute-credentials-secure.md
+10 -10
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@@ -37,16 +37,16 @@ username and password:
1. Create the Secret
kubectl create -f secret.yaml
kubectl create -f secret.yaml
**Note:** If you want to skip the Base64 encoding step, you can create a Secret
by using the `kubectl create secret` command:
kubectl create secret generic test-secret --from-literal=username='my-app' --from-literal=password='39528$vdg7Jb'
kubectl create secret generic test-secret --from-literal=username='my-app' --from-literal=password='39528$vdg7Jb'
1. View information about the Secret:
kubectl get secret test-secret
kubectl get secret test-secret
Output:
@@ -56,7 +56,7 @@ username and password:
1. View more detailed information about the Secret:
kubectl describe secret test-secret
kubectl describe secret test-secret
Output:
@@ -80,11 +80,11 @@ Here is a configuration file you can use to create a Pod:
1. Create the Pod:
kubectl create -f secret-pod.yaml
kubectl create -f secret-pod.yaml
1. Verify that your Pod is running:
kubectl get pod secret-test-pod
kubectl get pod secret-test-pod
Output:
@@ -94,7 +94,7 @@ Here is a configuration file you can use to create a Pod:
1. Get a shell into the Container that is running in your Pod:
kubectl exec -it secret-test-pod -- /bin/bash
kubectl exec -it secret-test-pod -- /bin/bash
1. The secret data is exposed to the Container through a Volume mounted under
`/etc/secret-volume`. In your shell, go to the directory where the secret data
@@ -127,11 +127,11 @@ Here is a configuration file you can use to create a Pod:
1. Create the Pod:
kubectl create -f secret-envars-pod.yaml
kubectl create -f secret-envars-pod.yaml
1. Verify that your Pod is running:
kubectl get pod secret-envars-test-pod
kubectl get pod secret-envars-test-pod
Output:
@@ -140,7 +140,7 @@ Here is a configuration file you can use to create a Pod:
1. Get a shell into the Container that is running in your Pod:
kubectl exec -it secret-envars-test-pod -- /bin/bash
kubectl exec -it secret-envars-test-pod -- /bin/bash
1. In your shell, display the environment variables:
docs/tasks/run-application/horizontal-pod-autoscale.md
+20 -10
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@@ -123,18 +123,28 @@ Kubernetes 1.6 adds support for making use of custom metrics in the Horizontal P
You can add custom metrics for the Horizontal Pod Autoscaler to use in the `autoscaling/v2alpha1` API.
Kubernetes then queries the new custom metrics API to fetch the values of the appropriate custom metrics.
### Prerequisites
### Requirements
In order to use custom metrics in the Horizontal Pod Autoscaler, you must deploy your cluster with the
`--horizontal-pod-autoscaler-use-rest-clients` flag on the controller manager set to true. You must then configure
your controller manager to speak to the API server through the API server aggregator, by setting the controller
manager's target API server to the API server aggregator (using the `--apiserver` flag). The resource metrics API and
custom metrics API must also be registered with the API server aggregator, and must be served by API servers running
on the cluster.
To use custom metrics with your Horizontal Pod Autoscaler, you must set the necessary configurations when deploying your cluster:
You can use Heapster's implementation of the resource metrics API by running Heapster with the`--api-server` flag set
to true. A separate component must provide the custom metrics API (more information on the custom metrics API is
available at [the k8s.io/metrics repository](https://github.com/kubernetes/metrics)).
* [Enable the API aggregation layer](/docs/tasks/access-kubernetes-api/configure-aggregation-layer/) if you have not already done so.
* Register your resource metrics API and your
custom metrics API with the API aggregation layer. Both of these API servers must be running *on* your cluster.
* *Resource Metrics API*: You can use Heapster's implementation of the resource metrics API, by running Heapster with its `--api-server` flag set to true.
* *Custom Metrics API*: This must be provided by a separate component. To get started with boilerplate code, see the [kubernetes-incubator/custom-metrics-apiserver](https://github.com/kubernetes-incubator/custom-metrics-apiserver) and the [k8s.io/metrics](https://github.com/kubernetes/metrics) repositories.
* Set the appropriate flags for kube-controller-manager:
* `--horizontal-pod-autoscaler-use-rest-clients` should be true.
* `--kubeconfig <path-to-kubeconfig>` OR `--master <ip-address-of-apiserver>`
Note that either the `--master` or `--kubeconfig` flag can be used; `--master` will override `--kubeconfig` if both are specified. These flags specify the location of the API aggregation layer, allowing the controller manager to communicate to the API server.
In Kubernetes 1.7, the standard aggregation layer that Kubernetes provides runs in-process with the kube-apiserver, so the target IP address can be found with `kubectl get pods --selector k8s-app=kube-apiserver --namespace kube-system -o jsonpath='{.items[0].status.podIP}'`.
## Further reading
docs/tasks/run-application/run-single-instance-stateful-application.md
+5 -5
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@@ -85,11 +85,11 @@ for a secure solution.
1. Deploy the contents of the YAML file:
kubectl create -f https://k8s.io/docs/tasks/run-application/mysql-deployment.yaml
kubectl create -f https://k8s.io/docs/tasks/run-application/mysql-deployment.yaml
1. Display information about the Deployment:
kubectl describe deployment mysql
kubectl describe deployment mysql
Name: mysql
Namespace: default
@@ -108,14 +108,14 @@ for a secure solution.
1. List the pods created by the Deployment:
kubectl get pods -l app=mysql
kubectl get pods -l app=mysql
NAME READY STATUS RESTARTS AGE
mysql-63082529-2z3ki 1/1 Running 0 3m
1. Inspect the Persistent Volume:
kubectl describe pv mysql-pv
kubectl describe pv mysql-pv
Name: mysql-pv
Labels: <none>
@@ -135,7 +135,7 @@ for a secure solution.
1. Inspect the PersistentVolumeClaim:
kubectl describe pvc mysql-pv-claim
kubectl describe pvc mysql-pv-claim
Name: mysql-pv-claim
Namespace: default
docs/tasks/run-application/run-stateless-application-deployment.md
+8 -8
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@@ -38,11 +38,11 @@ a Deployment that runs the nginx:1.7.9 Docker image:
1. Create a Deployment based on the YAML file:
kubectl create -f https://k8s.io/docs/tasks/run-application/deployment.yaml
kubectl create -f https://k8s.io/docs/tasks/run-application/deployment.yaml
1. Display information about the Deployment:
kubectl describe deployment nginx-deployment
kubectl describe deployment nginx-deployment
user@computer:~/kubernetes.github.io$ kubectl describe deployment nginx-deployment
Name: nginx-deployment
@@ -64,7 +64,7 @@ a Deployment that runs the nginx:1.7.9 Docker image:
1. List the pods created by the deployment:
kubectl get pods -l app=nginx
kubectl get pods -l app=nginx
NAME READY STATUS RESTARTS AGE
nginx-deployment-1771418926-7o5ns 1/1 Running 0 16h
@@ -72,7 +72,7 @@ a Deployment that runs the nginx:1.7.9 Docker image:
1. Display information about a pod:
kubectl describe pod <pod-name>
kubectl describe pod <pod-name>
where `<pod-name>` is the name of one of your pods.
@@ -85,11 +85,11 @@ specifies that the deployment should be updated to use nginx 1.8.
1. Apply the new YAML file:
kubectl apply -f https://k8s.io/docs/tutorials/stateless-application/deployment-update.yaml
kubectl apply -f https://k8s.io/docs/tutorials/stateless-application/deployment-update.yaml
1. Watch the deployment create pods with new names and delete the old pods:
kubectl get pods -l app=nginx
kubectl get pods -l app=nginx
## Scaling the application by increasing the replica count
@@ -101,11 +101,11 @@ should have four pods:
1. Apply the new YAML file:
kubectl apply -f https://k8s.io/docs/tutorials/stateless-application/deployment-scale.yaml
kubectl apply -f https://k8s.io/docs/tutorials/stateless-application/deployment-scale.yaml
1. Verify that the Deployment has four pods:
kubectl get pods -l app=nginx
kubectl get pods -l app=nginx
The output is similar to this:
docs/tutorials/object-management-kubectl/declarative-object-management-configuration.md
+3 -3
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@@ -894,7 +894,7 @@ configuration involves several manual steps:
1. Export the live object to a local configuration file:
kubectl get <kind>/<name> -o yaml --export > <kind>_<name>.yaml
kubectl get <kind>/<name> -o yaml --export > <kind>_<name>.yaml
1. Manually remove the `status` field from the configuration file.
@@ -903,7 +903,7 @@ configuration involves several manual steps:
1. Set the `kubectl.kubernetes.io/last-applied-configuration` annotation on the object:
kubectl replace --save-config -f <kind>_<name>.yaml
kubectl replace --save-config -f <kind>_<name>.yaml
1. Change processes to use `kubectl apply` for managing the object exclusively.
@@ -915,7 +915,7 @@ TODO(pwittrock): Why doesn't export remove the status field? Seems like it shou
1. Set the `kubectl.kubernetes.io/last-applied-configuration` annotation on the object:
kubectl replace --save-config -f <kind>_<name>.yaml
kubectl replace --save-config -f <kind>_<name>.yaml
1. Change processes to use `kubectl apply` for managing the object exclusively.
docs/tutorials/object-management-kubectl/imperative-object-management-configuration.md
+2 -2
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@@ -97,13 +97,13 @@ several manual steps.
1. Export the live object to a local object configuration file:
kubectl get <kind>/<name> -o yaml --export > <kind>_<name>.yaml
kubectl get <kind>/<name> -o yaml --export > <kind>_<name>.yaml
1. Manually remove the status field from the object configuration file.
1. For subsequent object management, use `replace` exclusively.
kubectl replace -f <kind>_<name>.yaml
kubectl replace -f <kind>_<name>.yaml
## Defining controller selectors and PodTemplate labels
docs/tutorials/stateless-application/expose-external-ip-address.md
+10 -10
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@@ -40,7 +40,7 @@ external IP address.
1. Run a Hello World application in your cluster:
kubectl run hello-world --replicas=5 --labels="run=load-balancer-example" --image=gcr.io/google-samples/node-hello:1.0 --port=8080
kubectl run hello-world --replicas=5 --labels="run=load-balancer-example" --image=gcr.io/google-samples/node-hello:1.0 --port=8080
The preceding command creates a
[Deployment](/docs/concepts/workloads/controllers/deployment/)
@@ -52,21 +52,21 @@ external IP address.
1. Display information about the Deployment:
kubectl get deployments hello-world
kubectl describe deployments hello-world
kubectl get deployments hello-world
kubectl describe deployments hello-world
1. Display information about your ReplicaSet objects:
kubectl get replicasets
kubectl describe replicasets
kubectl get replicasets
kubectl describe replicasets
1. Create a Service object that exposes the deployment:
kubectl expose deployment hello-world --type=LoadBalancer --name=my-service
kubectl expose deployment hello-world --type=LoadBalancer --name=my-service
1. Display information about the Service:
kubectl get services my-service
kubectl get services my-service
The output is similar to this:
@@ -78,7 +78,7 @@ external IP address.
1. Display detailed information about the Service:
kubectl describe services my-service
kubectl describe services my-service
The output is similar to this:
@@ -104,13 +104,13 @@ external IP address.
addresses of the pods that are running the Hello World application. To
verify these are pod addresses, enter this command:
kubectl get pods --output=wide
kubectl get pods --output=wide
The output is similar to this:
NAME ... IP NODE
hello-world-2895499144-1jaz9 ... 10.0.1.6 gke-cluster-1-default-pool-e0b8d269-1afc
hello-world-2895499144-2e5uh ... 0.0.1.8 gke-cluster-1-default-pool-e0b8d269-1afc
hello-world-2895499144-2e5uh ... 10.0.1.8 gke-cluster-1-default-pool-e0b8d269-1afc
hello-world-2895499144-9m4h1 ... 10.0.0.6 gke-cluster-1-default-pool-e0b8d269-5v7a
hello-world-2895499144-o4z13 ... 10.0.1.7 gke-cluster-1-default-pool-e0b8d269-1afc
hello-world-2895499144-segjf ... 10.0.2.5 gke-cluster-1-default-pool-e0b8d269-cpuc