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209 lines
7.2 KiB
Markdown
209 lines
7.2 KiB
Markdown
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# kubernetes-bundle
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The kubernetes-bundle allows you to deploy the many services of
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Kubernetes to a cloud environment and get started using the Kubernetes
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technology quickly.
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## Kubernetes
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Kubernetes is an open source system for managing containerized
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applications. Kubernetes uses [Docker](http://docker.com) to run
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containerized applications.
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## Juju TL;DR
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The [Juju](https://jujucharms.com) system provides provisioning and
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orchestration across a variety of clouds and bare metal. A juju bundle
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describes collection of services and how they interrelate. `juju
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quickstart` allows you to bootstrap a deployment environment and
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deploy a bundle.
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## Dive in!
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#### Install Juju Quickstart
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You will need to
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[install the Juju client](https://jujucharms.com/get-started) and
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`juju-quickstart` as prerequisites. To deploy the bundle use
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`juju-quickstart` which runs on Mac OS (`brew install
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juju-quickstart`) or Ubuntu (`apt-get install juju-quickstart`).
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### Deploy a Kubernetes Bundle
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Use the 'juju quickstart' command to deploy a Kubernetes cluster to any cloud
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supported by Juju.
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The charm store version of the Kubernetes bundle can be deployed as follows:
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juju quickstart u/kubernetes/kubernetes-cluster
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> Note: The charm store bundle may be locked to a specific Kubernetes release.
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Alternately you could deploy a Kubernetes bundle straight from github or a file:
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juju quickstart -i https://raw.githubusercontent.com/whitmo/bundle-kubernetes/master/bundles.yaml
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The command above does few things for you:
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- Starts a curses based gui for managing your cloud or MAAS credentials
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- Looks for a bootstrapped deployment environment, and bootstraps if
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required. This will launch a bootstrap node in your chosen
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deployment environment (machine 0).
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- Deploys the Juju GUI to your environment onto the bootstrap node.
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- Provisions 4 machines, and deploys the Kubernetes services on top of
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them (Kubernetes-master, two Kubernetes nodes using flannel, and etcd).
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- Orchestrates the relations among the services, and exits.
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Now you should have a running Kubernetes. Run `juju status
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--format=oneline` to see the address of your kubernetes-master unit.
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For further reading on [Juju Quickstart](https://pypi.python.org/pypi/juju-quickstart)
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Go to the [Getting started with Juju guide](https://kubernetes.io/docs/getting-started-guides/ubuntu/installation/#setting-up-kubernetes-with-juju)
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for more information about deploying a development Kubernetes cluster.
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### Using the Kubernetes Client
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You'll need the Kubernetes command line client,
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[kubectl](https://github.com/kubernetes/kubernetes/blob/master/docs/user-guide/kubectl/kubectl.md)
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to interact with the created cluster. The kubectl command is
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installed on the kubernetes-master charm. If you want to work with
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the cluster from your computer you will need to install the binary
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locally.
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You can access kubectl by a number ways using juju.
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via juju run:
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juju run --service kubernetes-master/0 "sudo kubectl get nodes"
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via juju ssh:
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juju ssh kubernetes-master/0 -t "sudo kubectl get nodes"
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You may also SSH to the kubernetes-master unit (`juju ssh kubernetes-master/0`)
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and call kubectl from the command prompt.
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See the
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[kubectl documentation](https://github.com/kubernetes/kubernetes/blob/master/docs/user-guide/kubectl/kubectl.md)
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for more details of what can be done with the command line tool.
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### Scaling up the cluster
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You can add capacity by adding more Docker units:
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juju add-unit docker
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### Known Limitations
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Kubernetes currently has several platform specific functionality. For
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example load balancers and persistence volumes only work with the
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Google Compute provider at this time.
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The Juju integration uses the Kubernetes null provider. This means
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external load balancers and storage can't be directly driven through
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Kubernetes config files at this time. We look forward to adding these
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capabilities to the charms.
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## More about the components the bundle deploys
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### Kubernetes master
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The master controls the Kubernetes cluster. It manages for the worker
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nodes and provides the primary interface for control by the user.
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### Kubernetes node
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The nodes are the servers that perform the work. Nodes must
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communicate with the master and run the workloads that are assigned to
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them.
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### Flannel-docker
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Flannel provides individual subnets for each machine in the cluster by
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creating a
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[software defined networking](http://en.wikipedia.org/wiki/Software-defined_networking).
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### Docker
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An open platform for distributed applications for developers and sysadmins.
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### Etcd
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Etcd persists state for Flannel and Kubernetes. It is a distributed
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key-value store with an http interface.
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## For further information on getting started with Juju
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Juju has complete documentation with regard to setup, and cloud
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configuration on it's own
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[documentation site](https://jujucharms.com/docs/).
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- [Getting Started](https://jujucharms.com/docs/stable/getting-started)
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- [Using Juju](https://jujucharms.com/docs/stable/charms)
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## Installing the kubectl outside of kubernetes-master unit
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Download the Kubernetes release from:
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https://github.com/kubernetes/kubernetes/releases and extract
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the release, you can then just directly use the cli binary at
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./kubernetes/platforms/linux/amd64/kubectl
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You'll need the address of the kubernetes-master as environment variable :
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juju status kubernetes-master/0
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Grab the public-address there and export it as KUBERNETES_MASTER
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environment variable :
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export KUBERNETES_MASTER=$(juju status --format=oneline kubernetes-master | grep kubernetes-master | cut -d' ' -f3):8080
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And now you can run kubectl on the command line :
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kubectl get no
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See the
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[kubectl documentation](https://github.com/kubernetes/kubernetes/blob/master/docs/user-guide/kubectl/kubectl.md)
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for more details of what can be done with the command line tool.
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## Hacking on the kubernetes-bundle and associated charms
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The kubernetes-bundle is open source and available on github.com. If
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you want to get started developing on the bundle you can clone it from
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github.
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git clone https://github.com/kubernetes/kubernetes.git
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Go to the [Getting started with Juju guide](https://kubernetes.io/docs/getting-started-guides/ubuntu/installation/#setting-up-kubernetes-with-juju)
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for more information about the bundle or charms.
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## How to contribute
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Send us pull requests! We'll send you a cookie if they include tests and docs.
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## Current and Most Complete Information
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The charms and bundles are in the [kubernetes](https://github.com/kubernetes/kubernetes)
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repository in github.
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- [kubernetes-master charm on GitHub](https://github.com/kubernetes/kubernetes/tree/master/cluster/juju/charms/trusty/kubernetes-master)
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- [kubernetes charm on GitHub](https://github.com/kubernetes/kubernetes/tree/master/cluster/juju/charms/trusty/kubernetes)
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More information about the
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[Kubernetes project](https://github.com/kubernetes/kubernetes)
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or check out the
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[Kubernetes Documentation](https://github.com/kubernetes/kubernetes/tree/master/docs)
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for more details about the Kubernetes concepts and terminology.
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Having a problem? Check the [Kubernetes issues database](https://github.com/kubernetes/kubernetes/issues)
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for related issues.
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[]()
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