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User, Admin, and Developer guides.
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# Kubernetes Documentation # Kubernetes Documentation
* [Primary concepts](#primary-concepts) * The [User's guide](user-guide.md) is for anyone who wants to run programs and services on an exisiting Kubernetes cluster.
* [Further reading](#further-reading)
* The [Cluster Admin's guide](cluster-admin-guide.md) is for anyone setting up a Kubernetes cluster or administering it.
Getting started guides are in [getting-started-guides](getting-started-guides). * The [Developer guide](developer-guide.md) is for anyone wanting to write programs that access the kubernetes API,
write plugins or extensions, or modify the core code of kubernetes.
There are example files and walkthroughs in the [examples](../examples) folder. * The [Kubectl Command Line Interface]([kubectl.md](kubectl.md)) is a detailed reference on the `kubectl` CLI.
If you're developing Kubernetes, docs are in the [devel](devel) folder. * The [API object documentation](http://kubernetes.io/third_party/swagger-ui/) is a detailed description of all fields found in core API objects.
Design docs are in [design](design). * An overview of the [Design of Kubernetes](../DESIGN.md)
API objects are explained at [http://kubernetes.io/third_party/swagger-ui/](http://kubernetes.io/third_party/swagger-ui/).
Frequently asked questions are answered on this project's [wiki](https://github.com/GoogleCloudPlatform/kubernetes/wiki).
## Primary concepts
* **Overview** ([overview.md](overview.md)): A brief overview
of Kubernetes concepts.
* **Nodes** ([node.md](node.md)): A node is a worker machine in Kubernetes.
* **Pods** ([pods.md](pods.md)): A pod is a tightly-coupled group of containers
with shared volumes.
* **The Life of a Pod** ([pod-states.md](pod-states.md)):
Covers the intersection of pod states, the PodStatus type, the life-cycle
of a pod, events, restart policies, and replication controllers.
* **Replication Controllers** ([replication-controller.md](replication-controller.md)):
A replication controller ensures that a specified number of pod "replicas" are
running at any one time.
* **Services** ([services.md](services.md)): A Kubernetes service is an abstraction
which defines a logical set of pods and a policy by which to access them.
* **Volumes** ([volumes.md](volumes.md)): A Volume is a directory, possibly with some
data in it, which is accessible to a Container.
* **Labels** ([labels.md](labels.md)): Labels are key/value pairs that are
attached to objects, such as pods. Labels can be used to organize and to
select subsets of objects.
* **Accessing the API** ([accessing_the_api.md](accessing_the_api.md)):
Ports, IPs, proxies, and firewall rules.
* **Kubernetes Web Interface** ([ui.md](ui.md)): Accessing the Kubernetes
web user interface.
* **Kubectl Command Line Interface** ([kubectl.md](kubectl.md)):
The `kubectl` command line reference.
* **Roadmap** ([roadmap.md](roadmap.md)): The set of supported use cases, features,
docs, and patterns that are required before Kubernetes 1.0.
* **Glossary** ([glossary.md](glossary.md)): Terms and concepts.
* **Cluster Management** ([cluster_management.md](cluster_management.md)): Starting and upgrading clusters.
## Further reading
* **Annotations** ([annotations.md](annotations.md)): Attaching
arbitrary non-identifying metadata.
* **API Conventions** ([api-conventions.md](api-conventions.md)):
Defining the verbs and resources used in the Kubernetes API.
* **Authentication Plugins** ([authentication.md](authentication.md)):
The current and planned states of authentication tokens.
* **Authorization Plugins** ([authorization.md](authorization.md)):
Authorization applies to all HTTP requests on the main apiserver port.
This doc explains the available authorization implementations.
* **API Client Libraries** ([client-libraries.md](client-libraries.md)):
A list of existing client libraries, both supported and user-contributed.
* **Kubernetes Container Environment** ([container-environment.md](container-environment.md)):
Describes the environment for Kubelet managed containers on a Kubernetes
node.
* **DNS Integration with SkyDNS** ([dns.md](dns.md)):
Resolving a DNS name directly to a Kubernetes service.
* **Identifiers** ([identifiers.md](identifiers.md)): Names and UIDs
explained.
* **Images** ([images.md](images.md)): Information about container images
and private registries.
* **Logging** ([logging.md](logging.md)): Pointers to logging info.
* **Namespaces** ([namespaces.md](namespaces.md)): Namespaces help different
projects, teams, or customers to share a kubernetes cluster.
* **Networking** ([networking.md](networking.md)): Pod networking overview.
* **OpenVSwitch GRE/VxLAN networking** ([ovs-networking.md](ovs-networking.md)):
Using OpenVSwitch to set up networking between pods across
Kubernetes nodes.
* **The Kubernetes Resource Model** ([resources.md](resources.md)):
Provides resource information such as size, type, and quantity to assist in
assigning Kubernetes resources appropriately.
* **Using Salt to configure Kubernetes** ([salt.md](salt.md)): The Kubernetes
cluster can be configured using Salt.
* There are example files and walkthroughs in the [examples](../examples) folder.

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# Kubernetes Cluster Admin Guide
The cluster admin guide is for anyone creating or administering a Kubernetes cluster.
It assumes some familiarity with concepts in the [User Guide](user-guide.md).
## Planning a cluster
There are many different examples of how to setup a kubernetes cluster. Many of them are listed in this
[matrix](docs/getting-started-guides/README.md). We call each of the combinations in this matrix a *distro*.
Before chosing a particular guide, here are some things to consider:
- Are you just looking to try out Kubernetes on your laptop, or build a high-availability many-node cluster? Both
models are supported, but some distros are better for one case or the other.
- Will you be using a hosted Kubernetes cluster, such as [GKE](https://cloud.google.com/container-engine), or setting
one up yourself?
- Will your cluster be on-premises, or in the cloud (IaaS)? Kubernetes does not directly support hybrid clusters. We
recommend setting up multiple clusters rather than spanning distant locations.
- Will you be running Kubernetes on "bare metal" or virtual machines? Kubernetes supports both, via different distros.
- Do you just want to run a cluster, or do you expect to do active development of kubernetes project code? If the
latter, it is better to pick a distro actively used by other developers. Some distros only use binary releases, but
offer is a greater variety of choices.
- Not all distros are maintained as actively. Prefer ones which are listed as tested on a more recent version of
Kubernetes.
- If you are configuring kubernetes on-premises, you will need to consider what [networking
model](../../docs/networking.md) fits best.
- If you are designing for very [high-availability](availability.md), you may want multiple clusters in multiple zones.
## Setting up a cluster
Pick one of the Getting Started Guides from the [matrix](docs/getting-started-guides/README.md) and follow it.
If none of the Getting Started Guides fits, you may want to pull ideas from several of the guides.
One option for custom networking is *OpenVSwitch GRE/VxLAN networking* ([ovs-networking.md](ovs-networking.md)), which
uses OpenVSwitch to set up networking between pods across
Kubernetes nodes.
If you are modifying an existing guide which uses Salt, this document explains [how Salt is used in the Kubernetes
project.](salt.md).
## Upgrading a cluster
[Upgrading a cluster](cluster_management.md).
## Managing nodes
[Managing nodes](node.md).
## Optional Cluster Services
* **DNS Integration with SkyDNS** ([dns.md](dns.md)):
Resolving a DNS name directly to a Kubernetes service.
* **Logging** with [Kibana](logging.md)
## Multi-tenant support
* **Namespaces** ([namespaces.md](namespaces.md)): Namespaces help different
projects, teams, or customers to share a kubernetes cluster.
## Security
* **Kubernetes Container Environment** ([container-environment.md](container-environment.md)):
Describes the environment for Kubelet managed containers on a Kubernetes
node.
* **Securing access to the API Server** [accessing the api]( accessing_the_api.md)
* **Authentication** [authentication]( authentication.md)
* **Authorization** [authorization]( authorization.md)

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# Kubernetes Developer Guide
The developer guide is for anyone wanting to either write code which directly accesses the
kubernetes API, or to contribute directly to the kubernetes project.
It assumes some familiarity with concepts in the [User Guide](user-guide.md) and the [Cluster Admin
Guide](cluster-admin-guide.md).
## Developing against the Kubernetes API
* API objects are explained at [http://kubernetes.io/third_party/swagger-ui/](http://kubernetes.io/third_party/swagger-ui/).
* **Annotations** ([annotations.md](annotations.md)): are for attaching arbitrary non-identifying metadata to objects.
Programs that automate Kubernetes objects may use annotations to store small amounts of their state.
* **API Conventions** ([api-conventions.md](api-conventions.md)):
Defining the verbs and resources used in the Kubernetes API.
* **API Client Libraries** ([client-libraries.md](client-libraries.md)):
A list of existing client libraries, both supported and user-contributed.
## Writing Plugins
* **Authentication Plugins** ([authentication.md](authentication.md)):
The current and planned states of authentication tokens.
* **Authorization Plugins** ([authorization.md](authorization.md)):
Authorization applies to all HTTP requests on the main apiserver port.
This doc explains the available authorization implementations.
## Contributing to the Kubernetes Project
See this [README](../docs/devel/README.md).

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# Kubernetes User Guide
The user guide is intended for anyone who wants to run programs and services
on an existing Kubernetes cluster. Setup and administration of a
Kubernetes cluster is described in the [Cluster Admin Guide](cluster-admin-guide.md).
The developer guide describes is for anyone wanting to either write code which directly accesses the
kubernetes API, or to contribute directly to the kubernetes project.
## Primary concepts
* **Overview** ([overview.md](overview.md)): A brief overview
of Kubernetes concepts.
* **Nodes** ([node.md](node.md)): A node is a worker machine in Kubernetes.
* **Pods** ([pods.md](pods.md)): A pod is a tightly-coupled group of containers
with shared volumes.
* **The Life of a Pod** ([pod-states.md](pod-states.md)):
Covers the intersection of pod states, the PodStatus type, the life-cycle
of a pod, events, restart policies, and replication controllers.
* **Replication Controllers** ([replication-controller.md](replication-controller.md)):
A replication controller ensures that a specified number of pod "replicas" are
running at any one time.
* **Services** ([services.md](services.md)): A Kubernetes service is an abstraction
which defines a logical set of pods and a policy by which to access them.
* **Volumes** ([volumes.md](volumes.md)): A Volume is a directory, possibly with some
data in it, which is accessible to a Container.
* **Labels** ([labels.md](labels.md)): Labels are key/value pairs that are
attached to objects, such as pods. Labels can be used to organize and to
select subsets of objects.
* **Accessing the API** ([accessing_the_api.md](accessing_the_api.md)):
Ports, IPs, proxies, and firewall rules.
* **Kubernetes Web Interface** ([ui.md](ui.md)): Accessing the Kubernetes
web user interface.
* **Kubectl Command Line Interface** ([kubectl.md](kubectl.md)):
The `kubectl` command line reference.
* **Roadmap** ([roadmap.md](roadmap.md)): The set of supported use cases, features,
docs, and patterns that are required before Kubernetes 1.0.
* **Glossary** ([glossary.md](glossary.md)): Terms and concepts.
## Further reading
* **Annotations** ([annotations.md](annotations.md)): Attaching
arbitrary non-identifying metadata.
* **Kubernetes Container Environment** ([container-environment.md](container-environment.md)):
Describes the environment for Kubelet managed containers on a Kubernetes
node.
* **DNS Integration with SkyDNS** ([dns.md](dns.md)):
Resolving a DNS name directly to a Kubernetes service.
* **Identifiers** ([identifiers.md](identifiers.md)): Names and UIDs
explained.
* **Images** ([images.md](images.md)): Information about container images
and private registries.
* **Logging** ([logging.md](logging.md)): Pointers to logging info.
* **Namespaces** ([namespaces.md](namespaces.md)): Namespaces help different
projects, teams, or customers to share a kubernetes cluster.
* **Networking** ([networking.md](networking.md)): Pod networking overview.
* **The Kubernetes Resource Model** ([resources.md](resources.md)):
Provides resource information such as size, type, and quantity to assist in
assigning Kubernetes resources appropriately.
* **Accessing cluster services via a Proxy** [accessing-the-cluster.md](../docs/accessing-the-cluster.md)
* The [API object documentation](http://kubernetes.io/third_party/swagger-ui/).
* Frequently asked questions are answered on this project's [wiki](https://github.com/GoogleCloudPlatform/kubernetes/wiki).