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171 lines
6.4 KiB
Markdown
171 lines
6.4 KiB
Markdown
Getting started locally
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-----------------------
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**Table of Contents**
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- [Requirements](#requirements)
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- [Linux](#linux)
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- [Docker](#docker)
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- [etcd](#etcd)
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- [go](#go)
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- [OpenSSL](#openssl)
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- [Clone the repository](#clone-the-repository)
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- [Starting the cluster](#starting-the-cluster)
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- [Running a container](#running-a-container)
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- [Running a user defined pod](#running-a-user-defined-pod)
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- [Troubleshooting](#troubleshooting)
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- [I cannot reach service IPs on the network.](#i-cannot-reach-service-ips-on-the-network)
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- [I cannot create a replication controller with replica size greater than 1! What gives?](#i-cannot-create-a-replication-controller-with-replica-size-greater-than-1--what-gives)
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- [I changed Kubernetes code, how do I run it?](#i-changed-kubernetes-code-how-do-i-run-it)
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- [kubectl claims to start a container but `get pods` and `docker ps` don't show it.](#kubectl-claims-to-start-a-container-but-get-pods-and-docker-ps-dont-show-it)
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- [The pods fail to connect to the services by host names](#the-pods-fail-to-connect-to-the-services-by-host-names)
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### Requirements
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#### Linux
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Not running Linux? Consider running [Minikube](http://kubernetes.io/docs/getting-started-guides/minikube/), or on a cloud provider like [Google Compute Engine](../getting-started-guides/gce.md).
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#### Docker
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At least [Docker](https://docs.docker.com/installation/#installation)
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1.3+. Ensure the Docker daemon is running and can be contacted (try `docker
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ps`). Some of the Kubernetes components need to run as root, which normally
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works fine with docker.
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#### etcd
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You need an [etcd](https://github.com/coreos/etcd/releases) in your path, please make sure it is installed and in your ``$PATH``.
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#### go
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You need [go](https://golang.org/doc/install) in your path (see [here](development.md#go-versions) for supported versions), please make sure it is installed and in your ``$PATH``.
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#### OpenSSL
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You need [OpenSSL](https://www.openssl.org/) installed. If you do not have the `openssl` command available, you may see the following error in `/tmp/kube-apiserver.log`:
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```
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server.go:333] Invalid Authentication Config: open /tmp/kube-serviceaccount.key: no such file or directory
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```
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### Clone the repository
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In order to run kubernetes you must have the kubernetes code on the local machine. Cloning this repository is sufficient.
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```$ git clone --depth=1 https://github.com/kubernetes/kubernetes.git```
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The `--depth=1` parameter is optional and will ensure a smaller download.
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### Starting the cluster
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In a separate tab of your terminal, run the following (since one needs sudo access to start/stop Kubernetes daemons, it is easier to run the entire script as root):
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```sh
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cd kubernetes
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hack/local-up-cluster.sh
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```
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This will build and start a lightweight local cluster, consisting of a master
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and a single node. Type Control-C to shut it down.
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If you've already compiled the Kubernetes components, then you can avoid rebuilding them with this script by using the `-O` flag.
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```sh
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./hack/local-up-cluster.sh -O
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```
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You can use the cluster/kubectl.sh script to interact with the local cluster. hack/local-up-cluster.sh will
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print the commands to run to point kubectl at the local cluster.
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### Running a container
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Your cluster is running, and you want to start running containers!
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You can now use any of the cluster/kubectl.sh commands to interact with your local setup.
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```sh
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cluster/kubectl.sh get pods
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cluster/kubectl.sh get services
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cluster/kubectl.sh get replicationcontrollers
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cluster/kubectl.sh run my-nginx --image=nginx --replicas=2 --port=80
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## begin wait for provision to complete, you can monitor the docker pull by opening a new terminal
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sudo docker images
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## you should see it pulling the nginx image, once the above command returns it
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sudo docker ps
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## you should see your container running!
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exit
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## end wait
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## introspect Kubernetes!
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cluster/kubectl.sh get pods
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cluster/kubectl.sh get services
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cluster/kubectl.sh get replicationcontrollers
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```
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### Running a user defined pod
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Note the difference between a [container](../user-guide/containers.md)
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and a [pod](../user-guide/pods.md). Since you only asked for the former, Kubernetes will create a wrapper pod for you.
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However you cannot view the nginx start page on localhost. To verify that nginx is running you need to run `curl` within the docker container (try `docker exec`).
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You can control the specifications of a pod via a user defined manifest, and reach nginx through your browser on the port specified therein:
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```sh
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cluster/kubectl.sh create -f test/fixtures/doc-yaml/user-guide/pod.yaml
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```
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Congratulations!
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### Troubleshooting
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#### I cannot reach service IPs on the network.
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Some firewall software that uses iptables may not interact well with
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kubernetes. If you have trouble around networking, try disabling any
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firewall or other iptables-using systems, first. Also, you can check
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if SELinux is blocking anything by running a command such as `journalctl --since yesterday | grep avc`.
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By default the IP range for service cluster IPs is 10.0.*.* - depending on your
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docker installation, this may conflict with IPs for containers. If you find
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containers running with IPs in this range, edit hack/local-cluster-up.sh and
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change the service-cluster-ip-range flag to something else.
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#### I cannot create a replication controller with replica size greater than 1! What gives?
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You are running a single node setup. This has the limitation of only supporting a single replica of a given pod. If you are interested in running with larger replica sizes, we encourage you to try the local vagrant setup or one of the cloud providers.
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#### I changed Kubernetes code, how do I run it?
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```sh
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cd kubernetes
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make
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hack/local-up-cluster.sh
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```
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#### kubectl claims to start a container but `get pods` and `docker ps` don't show it.
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One or more of the Kubernetes daemons might've crashed. Tail the logs of each in /tmp.
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#### The pods fail to connect to the services by host names
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To start the DNS service, you need to set the following variables:
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```sh
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KUBE_ENABLE_CLUSTER_DNS=true
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KUBE_DNS_SERVER_IP="10.0.0.10"
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KUBE_DNS_DOMAIN="cluster.local"
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KUBE_DNS_REPLICAS=1
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```
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To know more on DNS service you can look [here](http://issue.k8s.io/6667). Related documents can be found [here](../../build-tools/kube-dns/#how-do-i-configure-it)
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