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Merge branch 'master' into release-1.5

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Saad Ali
2016-12-12 16:21:05 -08:00
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_includes/partner-script.js
+14
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@@ -196,6 +196,13 @@
link: 'https://content.mirantis.com/Containerizing-OpenStack-on-Kubernetes-Video-Landing-Page.html',
blurb: 'Mirantis builds and manages private clouds with open source software such as OpenStack, deployed as containers orchestrated by Kubernetes.'
},
{
type: 0,
name: 'Kubernetic',
logo: 'kubernetic',
link: 'https://kubernetic.com/',
blurb: 'Kubernetic is a Kubernetes Desktop client that simplifies and democratizes cluster management for DevOps.'
},
{
type: 1,
name: 'Apprenda',
@@ -266,6 +273,13 @@
link: 'http://www.skippbox.com/services/',
blurb: 'Skippbox brings its Kubernetes expertise to help companies embrace Kubernetes on their way to digital transformation. Skippbox offers both professional services and expert training.'
},
{
type: 1,
name: 'Harbur',
logo: 'harbur',
link: 'https://harbur.io/',
blurb: 'Based in Barcelona, Harbur is a consulting firm that helps companies deploy self-healing solutions empowered by Container technologies'
},
{
type: 1,
name: 'Endocode',
docs/getting-started-guides/minikube.md
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@@ -6,144 +6,314 @@ assignees:
---
Minikube is a tool that makes it easy to run Kubernetes locally. Minikube runs a single-node Kubernetes cluster inside a VM on your laptop for users looking to try out Kubernetes or develop with it day-to-day.
* TOC
{:toc}
Minikube starts a single node kubernetes cluster locally for purposes of development and testing.
Minikube packages and configures a Linux VM, Docker and all Kubernetes components, optimized for local development.
Minikube supports Kubernetes features such as:
### Minikube Features
* DNS
* NodePorts
* ConfigMaps and Secrets
* Dashboards
* Minikube supports Kubernetes features such as:
* DNS
* NodePorts
* ConfigMaps and Secrets
* Dashboards
* Container Runtime: Docker, and [rkt](https://github.com/coreos/rkt)
* Enabling CNI (Container Network Interface)
* Ingress
Minikube does not yet support Cloud Provider specific features such as:
* LoadBalancers
* PersistentVolumes
* Ingress
## Installation
### Requirements
Minikube requires that VT-x/AMD-v virtualization is enabled in BIOS on all platforms.
* OS X
* [xhyve driver](./DRIVERS.md#xhyve-driver), [VirtualBox](https://www.virtualbox.org/wiki/Downloads) or [VMware Fusion](https://www.vmware.com/products/fusion) installation
* Linux
* [VirtualBox](https://www.virtualbox.org/wiki/Downloads) or [KVM](http://www.linux-kvm.org/) installation,
* VT-x/AMD-v virtualization must be enabled in BIOS
* `kubectl` must be on your path. To install kubectl:
To check that this is enabled on Linux, run:
**Kubectl for Linux/amd64**
```
curl -Lo kubectl http://storage.googleapis.com/kubernetes-release/release/{{page.version}}.0/bin/linux/amd64/kubectl && chmod +x kubectl && sudo mv kubectl /usr/local/bin/
```
**Kubectl for OS X/amd64**
```
curl -Lo kubectl http://storage.googleapis.com/kubernetes-release/release/{{page.version}}.0/bin/darwin/amd64/kubectl && chmod +x kubectl && sudo mv kubectl /usr/local/bin/
```
### Instructions
See the installation instructions for the [latest release](https://github.com/kubernetes/minikube/releases).
## Quickstart
Here's a brief demo of minikube usage.
If you want to change the VM driver add the appropriate `--vm-driver=xxx` flag to `minikube start`. Minikube Supports
the following drivers:
* virtualbox
* vmwarefusion
* kvm ([driver installation](./DRIVERS.md#kvm-driver))
* xhyve ([driver installation](./DRIVERS.md#xhyve-driver))
Note that the IP below is dynamic and can change. It can be retrieved with `minikube ip`.
```shell
cat /proc/cpuinfo | grep 'vmx\|svm'
```
This command should output something if the setting is enabled.
To check that this is enabled on OSX (most newer Macs have this enabled by default), run:
```shell
sysctl -a | grep machdep.cpu.features | grep VMX
```
This command should output something if the setting is enabled.
#### Linux
Minikube requires the latest [Virtualbox](https://www.virtualbox.org/wiki/Downloads) to be installed on your system.
#### OSX
Minikube requires one of the following:
* The latest [Virtualbox](https://www.virtualbox.org/wiki/Downloads).
* The latest version of [VMWare Fusion](https://www.vmware.com/products/fusion).
### Install `minikube`
See the [latest Minikube release](https://github.com/kubernetes/minikube/releases) for installation instructions.
### Install `kubectl`
You will need to download and install the kubectl client binary for `${K8S_VERSION}` (in this example: `{{page.version}}.0`)
to run commands against the cluster.
```shell
# linux/amd64
curl -Lo kubectl https://storage.googleapis.com/kubernetes-release/release/{{page.version}}.0/bin/linux/amd64/kubectl && chmod +x kubectl && sudo mv kubectl /usr/local/bin/
# linux/386
curl -Lo kubectl https://storage.googleapis.com/kubernetes-release/release/{{page.version}}.0/bin/linux/386/kubectl && chmod +x kubectl && sudo mv kubectl /usr/local/bin/
# linux/arm
curl -Lo kubectl https://storage.googleapis.com/kubernetes-release/release/{{page.version}}.0/bin/linux/arm/kubectl && chmod +x kubectl && sudo mv kubectl /usr/local/bin/
# linux/arm64
curl -Lo kubectl https://storage.googleapis.com/kubernetes-release/release/{{page.version}}.0/bin/linux/arm64/kubectl && chmod +x kubectl && sudo mv kubectl /usr/local/bin/
#linux/ppc64le
curl -Lo kubectl https://storage.googleapis.com/kubernetes-release/release/{{page.version}}.0/bin/linux/ppc64le/kubectl && chmod +x kubectl && sudo mv kubectl /usr/local/bin/
# OS X/amd64
curl -Lo kubectl https://storage.googleapis.com/kubernetes-release/release/{{page.version}}.0/bin/darwin/amd64/kubectl && chmod +x kubectl && sudo mv kubectl /usr/local/bin/
# OS X/386
curl -Lo kubectl https://storage.googleapis.com/kubernetes-release/release/{{page.version}}.0/bin/darwin/386/kubectl && chmod +x kubectl && sudo mv kubectl /usr/local/bin/
```
For Windows, download [kubectl.exe](http://storage.googleapis.com/kubernetes-release/release/{{page.version}}.0/bin/windows/amd64/kubectl.exe) and save it to a location on your PATH.
The generic download path is:
```
https://storage.googleapis.com/kubernetes-release/release/${K8S_VERSION}/bin/${GOOS}/${GOARCH}/${K8S_BINARY}
```
### Starting the cluster
To start a cluster, run the command:
```shell
minikube start
$ minikube start
Starting local Kubernetes cluster...
Kubectl is now configured to use the cluster.
Running pre-create checks...
Creating machine...
Starting local Kubernetes cluster...
$ kubectl run hello-minikube --image=gcr.io/google_containers/echoserver:1.4 --port=8080
deployment "hello-minikube" created
$ kubectl expose deployment hello-minikube --type=NodePort
service "hello-minikube" exposed
# We have now launched an echoserver pod but we have to wait until the pod is up before curling/accessing it
# via the exposed service.
# To check whether the pod is up and running we can use the following:
$ kubectl get pod
NAME READY STATUS RESTARTS AGE
hello-minikube-3383150820-vctvh 1/1 ContainerCreating 0 3s
# We can see that the pod is still being created from the ContainerCreating status
$ kubectl get pod
NAME READY STATUS RESTARTS AGE
hello-minikube-3383150820-vctvh 1/1 Running 0 13s
# We can see that the pod is now Running and we will now be able to curl it:
$ curl $(minikube service hello-minikube --url)
CLIENT VALUES:
client_address=192.168.99.1
command=GET
real path=/
...
$ minikube stop
Stopping local Kubernetes cluster...
Stopping "minikube"...
```
This will build and start a lightweight local cluster, consisting of a master, etcd, Docker and a single node.
### Using rkt container engine
Minikube will also create a "minikube" context, and set it to default in kubectl.
To switch back to this context later, run this command: `kubectl config use-context minikube`.
Type `minikube stop` to shut the cluster down.
Minikube also includes the [Kubernetes dashboard](http://kubernetes.io/docs/user-guide/ui/). Run this command to see the included kube-system pods:
To use [rkt](https://github.com/coreos/rkt) as the container runtime run:
```shell
$ kubectl get pods --all-namespaces
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system kube-addon-manager-127.0.0.1 1/1 Running 0 35s
kube-system kubernetes-dashboard-9brhv 1/1 Running 0 20s
$ minikube start \
--network-plugin=cni \
--container-runtime=rkt \
--iso-url=https://github.com/coreos/minikube-iso/releases/download/v0.0.5/minikube-v0.0.5.iso
```
Run this command to open the Kubernetes dashboard:
This will use an alternative minikube ISO image containing both rkt, and Docker, and enable CNI networking.
### Driver plugins
See [DRIVERS](./DRIVERS.md) for details on supported drivers and how to install
plugins, if required.
### Reusing the Docker daemon
When using a single VM of kubernetes its really handy to reuse the Docker daemon inside the VM; as this means you don't have to build on your host machine and push the image into a docker registry - you can just build inside the same docker daemon as minikube which speeds up local experiments.
To be able to work with the docker daemon on your mac/linux host use the [docker-env command](./docs/minikube_docker-env.md) in your shell:
```
eval $(minikube docker-env)
```
you should now be able to use docker on the command line on your host mac/linux machine talking to the docker daemon inside the minikube VM:
```
docker ps
```
On Centos 7, docker may report the following error:
```
Could not read CA certificate "/etc/docker/ca.pem": open /etc/docker/ca.pem: no such file or directory
```
The fix is to update /etc/sysconfig/docker to ensure that minikube's environment changes are respected:
```
< DOCKER_CERT_PATH=/etc/docker
---
> if [ -z "${DOCKER_CERT_PATH}" ]; then
> DOCKER_CERT_PATH=/etc/docker
> fi
```
Remember to turn off the imagePullPolicy:Always, as otherwise kubernetes won't use images you built locally.
## Managing your Cluster
### Starting a Cluster
The [minikube start](./docs/minikube_start.md) command can be used to start your cluster.
This command creates and configures a virtual machine that runs a single-node Kubernetes cluster.
This command also configures your [kubectl](http://kubernetes.io/docs/user-guide/kubectl-overview/) installation to communicate with this cluster.
### Configuring Kubernetes
Minikube has a "configurator" feature that allows users to configure the Kubernetes components with arbitrary values.
To use this feature, you can use the `--extra-config` flag on the `minikube start` command.
This flag is repeated, so you can pass it several times with several different values to set multiple options.
This flag takes a string of the form `component.key=value`, where `component` is one of the strings from the above list, `key` is a value on the
configuration struct and `value` is the value to set.
Valid `key`s can be found by examining the documentation for the Kubernetes `componentconfigs` for each component.
Here is the documentation for each supported configuration:
* [kubelet](https://godoc.org/k8s.io/kubernetes/pkg/apis/componentconfig#KubeletConfiguration)
* [apiserver](https://godoc.org/k8s.io/kubernetes/cmd/kube-apiserver/app/options#APIServer)
* [proxy](https://godoc.org/k8s.io/kubernetes/pkg/apis/componentconfig#KubeProxyConfiguration)
* [controller-manager](https://godoc.org/k8s.io/kubernetes/pkg/apis/componentconfig#KubeControllerManagerConfiguration)
* [etcd](https://godoc.org/github.com/coreos/etcd/etcdserver#ServerConfig)
* [scheduler](https://godoc.org/k8s.io/kubernetes/pkg/apis/componentconfig#KubeSchedulerConfiguration)
#### Examples
To change the `MaxPods` setting to 5 on the Kubelet, pass this flag: `--extra-config=kubelet.MaxPods=5`.
This feature also supports nested structs. To change the `LeaderElection.LeaderElect` setting to `true` on the scheduler, pass this flag: `--extra-config=scheduler.LeaderElection.LeaderElect=true`.
To set the `AuthorizationMode` on the `apiserver` to `RBAC`, you can use: `--extra-config=apiserver.AuthorizationMode=RBAC`.
### Stopping a Cluster
The [minikube stop](./docs/minikube_stop.md) command can be used to stop your cluster.
This command shuts down the minikube virtual machine, but preserves all cluster state and data.
Starting the cluster again will restore it to it's previous state.
### Deleting a Cluster
The [minikube delete](./docs/minikube_delete.md) command can be used to delete your cluster.
This command shuts down and deletes the minikube virtual machine. No data or state is preserved.
## Interacting With your Cluster
### Kubectl
The `minikube start` command creates a "[kubectl context](http://kubernetes.io/docs/user-guide/kubectl/kubectl_config_set-context/)" called "minikube".
This context contains the configuration to communicate with your minikube cluster.
Minikube sets this context to default automatically, but if you need to switch back to it in the future, run:
`kubectl config use-context minikube`,
or pass the context on each command like this: `kubectl get pods --context=minikube`.
### Dashboard
To access the [Kubernetes Dashboard](http://kubernetes.io/docs/user-guide/ui/), run this command in a shell after starting minikube to get the address:
```shell
minikube dashboard
```
### Test it out
List the nodes in your cluster by running:
### Services
To access a service exposed via a node port, run this command in a shell after starting minikube to get the address:
```shell
kubectl get nodes
minikube service [-n NAMESPACE] [--url] NAME
```
Minikube contains a built-in Docker daemon for running containers.
If you use another Docker daemon for building your containers, you will have to publish them to a registry before minikube can pull them.
You can use minikube's built in Docker daemon to avoid this extra step of pushing your images.
Use the built-in Docker daemon with:
## Networking
The minikube VM is exposed to the host system via a host-only IP address, that can be obtained with the `minikube ip` command.
Any services of type `NodePort` can be accessed over that IP address, on the NodePort.
To determine the NodePort for your service, you can use a `kubectl` command like this:
`kubectl get service $SERVICE --output='jsonpath="{.spec.ports[0].NodePort}"'`
## Persistent Volumes
Minikube supports [PersistentVolumes](http://kubernetes.io/docs/user-guide/persistent-volumes/) of type `hostPath`.
These PersistentVolumes are mapped to a directory inside the minikube VM.
The Minikube VM boots into a tmpfs, so most directories will not be persisted across reboots (`minikube stop`).
However, Minikube is configured to persist files stored under the following host directories:
* `/data`
* `/var/lib/localkube`
* `/var/lib/docker`
Here is an example PersistentVolume config to persist data in the '/data' directory:
```yaml
apiVersion: v1
kind: PersistentVolume
metadata:
name: pv0001
spec:
accessModes:
- ReadWriteOnce
capacity:
storage: 5Gi
hostPath:
path: /data/pv0001/
```
## Mounted Host Folders
Some drivers will mount a host folder within the VM so that you can easily share files between the VM and host. These are not configurable at the moment and different for the driver and OS you are using. Note: Host folder sharing is not implemented on Linux yet.
| Driver | OS | HostFolder | VM |
| --- | --- | --- | --- |
| Virtualbox | OSX | /Users | /Users |
| Virtualbox | Windows | C://Users | /c/Users |
| VMWare Fusion | OSX | /Users | /Users |
| Xhyve | OSX | /Users | /Users |
## Private Container Registries
To access a private container registry, follow the steps on [this page](http://kubernetes.io/docs/user-guide/images/).
We recommend you use ImagePullSecrets, but if you would like to configure access on the minikube VM you can place the `.dockercfg` in the `/home/docker` directory or the `config.json` in the `/home/docker/.docker` directory.
## Add-ons
In order to have minikube properly start/restart custom addons, place the addon(s) you wish to be launched with minikube in the `.minikube/addons` directory. Addons in this folder will be moved to the minikubeVM and launched each time minikube is started/restarted.
## Documentation
For a list of minikube's available commands see the [full CLI docs](./docs/minikube.md).
## Using Minikube with an HTTP Proxy
Minikube creates a Virtual Machine that includes Kubernetes and a Docker daemon.
When Kubernetes attempts to schedule containers using Docker, the Docker daemon may require external network access to pull containers.
If you are behind an HTTP proxy, you may need to supply Docker with the proxy settings.
To do this, pass the required environment variables as flags during `minikube start`.
For example:
```shell
eval $(minikube docker-env)
$ minikube start --docker-env HTTP_PROXY=http://$YOURPROXY:PORT \
--docker-env HTTPS_PROXY=https://$YOURPROXY:PORT
```
This command sets up the Docker environment variables so a Docker client can communicate with the minikube Docker daemon.
```shell
docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
42c643fea98b gcr.io/google_containers/kubernetes-dashboard-amd64:v1.0.1 "/dashboard --port=90" 3 minutes ago Up 3 minutes k8s_kubernetes-dashboard.1d0d880_kubernetes-dashboard-9brhv_kube-system_5062dd0b-370b-11e6-84b6-5eab1f51187f_134cba4c
475db7659edf gcr.io/google_containers/pause-amd64:3.0 "/pause" 3 minutes ago Up 3 minutes k8s_POD.2225036b_kubernetes-dashboard-9brhv_kube-system_5062dd0b-370b-11e6-84b6-5eab1f51187f_e76d8136
e9096501addf gcr.io/google-containers/kube-addon-manager-amd64:v2 "/opt/kube-addons.sh" 3 minutes ago Up 3 minutes k8s_kube-addon-manager.a1c58ca2_kube-addon-manager-127.0.0.1_kube-system_48abed82af93bb0b941173334110923f_82655b7d
64748893cf7c gcr.io/google_containers/pause-amd64:3.0 "/pause" 4 minutes ago Up 4 minutes k8s_POD.d8dbe16c_kube-addon-manager-127.0.0.1_kube-system_48abed82af93bb0b941173334110923f_c67701c3
```
## Known Issues
* Features that require a Cloud Provider will not work in Minikube. These include:
* LoadBalancers
* Features that require multiple nodes. These include:
* Advanced scheduling policies
## Design
Minikube uses [libmachine](https://github.com/docker/machine/tree/master/libmachine) for provisioning VMs, and [localkube](https://github.com/kubernetes/minikube/tree/master/pkg/localkube) (originally written and donated to this project by [RedSpread](https://redspread.com/)) for running the cluster.
For more information about minikube, see the [proposal](https://github.com/kubernetes/kubernetes/blob/master/docs/proposals/local-cluster-ux.md).
## Additional Links:
* **Goals and Non-Goals**: For the goals and non-goals of the minikube project, please see our [roadmap](./ROADMAP.md).
* **Development Guide**: See [CONTRIBUTING.md](./CONTRIBUTING.md) for an overview of how to send pull requests.
* **Building Minikube**: For instructions on how to build/test minikube from source, see the [build guide](./BUILD_GUIDE.md)
* **Adding a New Dependency**: For instructions on how to add a new dependency to minikube see the [adding dependencies guide](./ADD_DEPENDENCY.md)
* **Updating Kubernetes**: For instructions on how to add a new dependency to minikube see the [updating kubernetes guide](./UPDATE_KUBERNETES.md)
## Community
Contributions, questions, and comments are all welcomed and encouraged! minkube developers hang out on [Slack](https://kubernetes.slack.com) in the #minikube channel (get an invitation [here](http://slack.kubernetes.io/)). We also have the [kubernetes-dev Google Groups mailing list](https://groups.google.com/forum/#!forum/kubernetes-dev). If you are posting to the list please prefix your subject with "minikube: ".
docs/user-guide/kubectl-cheatsheet.md
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@@ -178,7 +178,7 @@ $ KUBE_EDITOR="nano" kubectl edit svc/docker-registry # Use an alternative edi
## Scaling Resources
```console
$ kubectl scale --replicas=3 rs/foo # Scale a replicaset named 'foo' to
$ kubectl scale --replicas=3 rs/foo # Scale a replicaset named 'foo' to 3
$ kubectl scale --replicas=3 -f foo.yaml # Scale a resource specified in "foo.yaml" to 3
$ kubectl scale --current-replicas=2 --replicas=3 deployment/mysql # If the deployment named mysql's current size is 2, scale mysql to 3
$ kubectl scale --replicas=5 rc/foo rc/bar rc/baz # Scale multiple replication controllers
docs/user-guide/prereqs.md
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@@ -7,30 +7,52 @@ assignees:
To deploy and manage applications on Kubernetes, you’ll use the Kubernetes command-line tool, [kubectl](/docs/user-guide/kubectl/). It lets you inspect your cluster resources, create, delete, and update components, and much more. You will use it to look at your new cluster and bring up example apps.
## Installing kubectl
## Install kubectl Binary Via curl
If you downloaded a pre-compiled [release](https://github.com/kubernetes/kubernetes/releases), kubectl should be under `platforms/<os>/<arch>` from the tar bundle.
If you built from source, kubectl should be either under `_output/local/bin/<os>/<arch>` or `_output/dockerized/bin/<os>/<arch>`.
The kubectl binary doesn't have to be installed to be executable, but the rest of the walkthrough will assume that it's in your PATH.
The simplest way to install is to copy or move kubectl into a dir already in PATH (e.g. `/usr/local/bin`). For example:
Download the latest release with the command:
```shell
# OS X
$ sudo cp kubernetes/platforms/darwin/amd64/kubectl /usr/local/bin/kubectl
curl -LO https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/darwin/amd64/kubectl
# Linux
$ sudo cp kubernetes/platforms/linux/amd64/kubectl /usr/local/bin/kubectl
curl -LO https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl
```
You also need to ensure it's executable:
If you want to download a specific version of kubectl you can replace the nested curl command from above with the version you want. (e.g. v1.4.6, v1.5.0-beta.2)
Make the kubectl binary executable and move it to your PATH (e.g. `/usr/local/bin`):
```shell
$ sudo chmod +x /usr/local/bin/kubectl
chmod +x ./kubectl
sudo mv ./kubectl /usr/local/bin/kubectl
```
If you prefer not to copy kubectl, you need to ensure the tool is in your path:
## Extract kubectl from Release .tar.gz or Compiled Source
If you downloaded a pre-compiled [release](https://github.com/kubernetes/kubernetes/releases), kubectl will be under `platforms/<os>/<arch>` from the tar bundle.
If you compiled kubernetes from source, kubectl should be either under `_output/local/bin/<os>/<arch>` or `_output/dockerized/bin/<os>/<arch>`.
Copy or move kubectl into a directory already in your PATH (e.g. `/usr/local/bin`). For example:
```shell
# OS X
sudo cp platforms/darwin/amd64/kubectl /usr/local/bin/kubectl
# Linux
sudo cp platforms/linux/amd64/kubectl /usr/local/bin/kubectl
```
Next make it executable with the following command:
```shell
sudo chmod +x /usr/local/bin/kubectl
```
The kubectl binary doesn't have to be installed to be executable, but the rest of the walkthrough will assume that it's in your PATH.
If you prefer not to copy kubectl, you need to ensure it is in your path:
```shell
# OS X
@@ -57,4 +79,4 @@ If you see a url response, you are ready to go.
## What's next?
[Learn how to launch and expose your application.](/docs/user-guide/quick-start)
[Learn how to launch and expose your application.](/docs/user-guide/quick-start)
docs/user-guide/production-pods.md
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@@ -11,11 +11,11 @@ You've seen [how to configure and deploy pods and containers](/docs/user-guide/c
* TOC
{:toc}
## Persistent storage
## Using a Volume for storage
The container file system only lives as long as the container does, so when a container crashes and restarts, changes to the filesystem will be lost and the container will restart from a clean slate. To access more-persistent storage, outside the container file system, you need a [*volume*](/docs/user-guide/volumes). This is especially important to stateful applications, such as key-value stores and databases.
The container file system only lives as long as the container does, so when a container crashes and restarts, changes to the filesystem will be lost and the container will restart from a clean slate. For more consistent storage that lasts for the life of a Pod, you need a [*volume*](/docs/user-guide/volumes). This is especially important to stateful applications, such as key-value stores and databases.
For example, [Redis](http://redis.io/) is a key-value cache and store, which we use in the [guestbook](https://github.com/kubernetes/kubernetes/tree/{{page.githubbranch}}/examples/guestbook/) and other examples. We can add a volume to it to store persistent data as follows:
For example, [Redis](http://redis.io/) is a key-value cache and store, which we use in the [guestbook](https://github.com/kubernetes/kubernetes/tree/{{page.githubbranch}}/examples/guestbook/) and other examples. We can add a volume to it to store data as follows:
{% include code.html language="yaml" file="redis-deployment.yaml" ghlink="/docs/user-guide/redis-deployment.yaml" %}
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