Minor fixes for Development Documentation
Further cleans up the development documentation with spacing and more readable text.
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# Cluster getting Started
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This doc outlines the steps needed to setup a local dev cluster within which you
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can deploy/test an ingress controller. Note that you can also setup the ingress controller
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locally.
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## Deploy a Development cluster
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### Single node local cluster
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You can run the nginx ingress controller locally on any node with access to the
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internet, and the following dependencies: [docker](https://docs.docker.com/engine/getstarted/step_one/), [etcd](https://github.com/coreos/etcd/releases), [golang](https://golang.org/doc/install), [cfssl](https://github.com/cloudflare/cfssl#installation), [openssl](https://www.openssl.org/), [make](https://www.gnu.org/software/make/), [gcc](https://gcc.gnu.org/), [git](https://git-scm.com/download/linux).
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Clone the kubernetes repo:
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```console
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$ cd $GOPATH/src/k8s.io
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$ git clone https://github.com/kubernetes/kubernetes.git
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```
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Add yourself to the docker group, if you haven't done so already (or give
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local-up-cluster sudo)
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```
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$ sudo usermod -aG docker $USER
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$ sudo reboot
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..
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$ docker ps
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CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
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```
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**NB: the next step will bring up Kubernetes daemons directly on your dev
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machine, no sandbox, iptables rules, routes, loadbalancers, network bridges
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etc are created on the host.**
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```console
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$ cd $GOPATH/src/k8s.io/kubernetes
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$ hack/local-up-cluster.sh
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```
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Check for Ready nodes
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```console
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$ kubectl get no --context=local
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NAME STATUS AGE VERSION
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127.0.0.1 Ready 5s v1.6.0-alpha.0.1914+8ccecf93aa6db5-dirty
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```
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### Minikube cluster
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[Minikube](https://github.com/kubernetes/minikube) is a popular way to bring up
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a sandboxed local cluster. You will first need to [install](https://github.com/kubernetes/minikube/releases)
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the minikube binary, then bring up a cluster
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```console
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$ minikube start
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```
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Check for Ready nodes
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```console
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$ kubectl get no
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NAME STATUS AGE VERSION
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minikube Ready 42m v1.4.6
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```
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List the existing addons
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```console
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$ minikube addons list
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- addon-manager: enabled
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- dashboard: enabled
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- kube-dns: enabled
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- heapster: disabled
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```
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If this list already contains the ingress controller, you don't need to
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redeploy it. If the addon controller is disabled, you can enable it with
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```console
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$ minikube addons enable ingress
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```
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If the list *does not* contain the ingress controller, you can either update
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minikube, or deploy it yourself as shown in the next section.
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You may want to consider [using the VM's docker
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daemon](https://github.com/kubernetes/minikube/blob/master/README.md#reusing-the-docker-daemon)
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when developing.
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### CoreOS Kubernetes
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[CoreOS Kubernetes](https://github.com/coreos/coreos-kubernetes/) repository has `Vagrantfile`
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scripts to easily create a new Kubernetes cluster on VirtualBox, VMware or AWS.
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Follow the CoreOS [doc](https://coreos.com/kubernetes/docs/latest/kubernetes-on-vagrant-single.html)
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for detailed instructions.
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## Deploy the ingress controller
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You can deploy an ingress controller on the cluster setup in the previous step
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[like this](../../examples/deployment).
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## Run against a remote cluster
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If the controller you're interested in using supports a "dry-run" flag, you can
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run it on any machine that has `kubectl` access to a remote cluster. Eg:
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```console
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$ cd $GOPATH/k8s.io/ingress/controllers/gce
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$ glbc --help
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--running-in-cluster Optional, if this controller is running in a kubernetes cluster, use the
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pod secrets for creating a Kubernetes client. (default true)
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$ ./glbc --running-in-cluster=false
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I1210 17:49:53.202149 27767 main.go:179] Starting GLBC image: glbc:0.9.2, cluster name
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```
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Note that this is equivalent to running the ingress controller on your local
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machine, so if you already have an ingress controller running in the remote
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cluster, they will fight for the same ingress.
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