mirror of https://github.com/k3s-io/k3s
133 lines
4.7 KiB
Markdown
133 lines
4.7 KiB
Markdown
<!-- BEGIN MUNGE: UNVERSIONED_WARNING -->
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<!-- BEGIN STRIP_FOR_RELEASE -->
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<img src="http://kubernetes.io/img/warning.png" alt="WARNING"
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width="25" height="25">
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<img src="http://kubernetes.io/img/warning.png" alt="WARNING"
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width="25" height="25">
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<img src="http://kubernetes.io/img/warning.png" alt="WARNING"
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width="25" height="25">
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<img src="http://kubernetes.io/img/warning.png" alt="WARNING"
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width="25" height="25">
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<img src="http://kubernetes.io/img/warning.png" alt="WARNING"
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width="25" height="25">
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<h2>PLEASE NOTE: This document applies to the HEAD of the source tree</h2>
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If you are using a released version of Kubernetes, you should
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refer to the docs that go with that version.
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<!-- TAG RELEASE_LINK, added by the munger automatically -->
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<strong>
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The latest release of this document can be found
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[here](http://releases.k8s.io/release-1.1/docs/getting-started-guides/docker-multinode.md).
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Documentation for other releases can be found at
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[releases.k8s.io](http://releases.k8s.io).
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</strong>
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--
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<!-- END STRIP_FOR_RELEASE -->
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<!-- END MUNGE: UNVERSIONED_WARNING -->
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Running Multi-Node Kubernetes Using Docker
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------------------------------------------
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_Note_:
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These instructions are somewhat significantly more advanced than the [single node](docker.md) instructions. If you are
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interested in just starting to explore Kubernetes, we recommend that you start there.
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**Table of Contents**
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- [Prerequisites](#prerequisites)
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- [Overview](#overview)
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- [Bootstrap Docker](#bootstrap-docker)
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- [Master Node](#master-node)
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- [Adding a worker node](#adding-a-worker-node)
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- [Deploy a DNS](#deploy-a-dns)
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- [Testing your cluster](#testing-your-cluster)
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## Prerequisites
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The only thing you need is a machine with **Docker 1.7.1 or higher**
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## Overview
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This guide will set up a 2-node Kubernetes cluster, consisting of a _master_ node which hosts the API server and orchestrates work
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and a _worker_ node which receives work from the master. You can repeat the process of adding worker nodes an arbitrary number of
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times to create larger clusters.
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Here's a diagram of what the final result will look like:
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### Bootstrap Docker
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This guide also uses a pattern of running two instances of the Docker daemon
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1) A _bootstrap_ Docker instance which is used to start system daemons like `flanneld` and `etcd`
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2) A _main_ Docker instance which is used for the Kubernetes infrastructure and user's scheduled containers
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This pattern is necessary because the `flannel` daemon is responsible for setting up and managing the network that interconnects
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all of the Docker containers created by Kubernetes. To achieve this, it must run outside of the _main_ Docker daemon. However,
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it is still useful to use containers for deployment and management, so we create a simpler _bootstrap_ daemon to achieve this.
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You can specify the version on every node before install:
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```sh
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export K8S_VERSION=<your_k8s_version (e.g. 1.2.0-alpha.7)>
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export ETCD_VERSION=<your_etcd_version (e.g. 2.2.1)>
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export FLANNEL_VERSION=<your_flannel_version (e.g. 0.5.5)>
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export FLANNEL_IFACE=<flannel_interface (defaults to eth0)>
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export FLANNEL_IPMASQ=<flannel_ipmasq_flag (defaults to true)>
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```
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Otherwise, we'll use latest `hyperkube` image as default k8s version.
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## Master Node
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The first step in the process is to initialize the master node.
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The MASTER_IP step here is optional, it defaults to the first value of `hostname -I`.
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Clone the Kubernetes repo, and run [master.sh](docker-multinode/master.sh) on the master machine _with root_:
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```console
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$ export MASTER_IP=<your_master_ip (e.g. 1.2.3.4)>
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$ cd kubernetes/docs/getting-started-guides/docker-multinode/
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$ ./master.sh
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```
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`Master done!`
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See [here](docker-multinode/master.md) for detailed instructions explanation.
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## Adding a worker node
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Once your master is up and running you can add one or more workers on different machines.
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Clone the Kubernetes repo, and run [worker.sh](docker-multinode/worker.sh) on the worker machine _with root_:
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```console
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$ export MASTER_IP=<your_master_ip (e.g. 1.2.3.4)>
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$ cd kubernetes/docs/getting-started-guides/docker-multinode/
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$ ./worker.sh
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```
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`Worker done!`
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See [here](docker-multinode/worker.md) for detailed instructions explanation.
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## Deploy a DNS
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See [here](docker-multinode/deployDNS.md) for instructions.
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## Testing your cluster
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Once your cluster has been created you can [test it out](docker-multinode/testing.md)
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For more complete applications, please look in the [examples directory](../../examples/)
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<!-- BEGIN MUNGE: GENERATED_ANALYTICS -->
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[]()
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<!-- END MUNGE: GENERATED_ANALYTICS -->
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