├── pause ├── .gitignore ├── Dockerfile └── pause.go ├── .gitignore ├── kubelet.service ├── Dockerfile.hyperkube ├── kube-proxy.yaml ├── Dockerfile.etcd ├── kubernetes.yaml ├── README.md └── LICENSE /pause/.gitignore: -------------------------------------------------------------------------------- 1 | pause 2 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | etcd 2 | images 3 | kubectl 4 | kubelet 5 | -------------------------------------------------------------------------------- /kubelet.service: -------------------------------------------------------------------------------- 1 | [Unit] 2 | Description=Kubernetes Kubelet 3 | Documentation=https://github.com/kubernetes/kubernetes 4 | 5 | [Service] 6 | ExecStart=/usr/bin/kubelet \ 7 | --api-servers=http://rpi-master:8080 \ 8 | --allow-privileged=true \ 9 | --config=/etc/kubernetes/manifests \ 10 | --v=2 11 | Restart=on-failure 12 | RestartSec=5 13 | 14 | [Install] 15 | WantedBy=multi-user.target 16 | -------------------------------------------------------------------------------- /pause/Dockerfile: -------------------------------------------------------------------------------- 1 | # Copyright 2014 The Kubernetes Authors All rights reserved. 2 | # 3 | # Licensed under the Apache License, Version 2.0 (the "License"); 4 | # you may not use this file except in compliance with the License. 5 | # You may obtain a copy of the License at 6 | # 7 | # http://www.apache.org/licenses/LICENSE-2.0 8 | # 9 | # Unless required by applicable law or agreed to in writing, software 10 | # distributed under the License is distributed on an "AS IS" BASIS, 11 | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 | # See the License for the specific language governing permissions and 13 | # limitations under the License. 14 | 15 | FROM scratch 16 | ADD pause / 17 | ENTRYPOINT ["/pause"] 18 | -------------------------------------------------------------------------------- /Dockerfile.hyperkube: -------------------------------------------------------------------------------- 1 | # Copyright 2015 Skippbox 2 | # 3 | # Licensed under the Apache License, Version 2.0 (the "License"); 4 | # you may not use this file except in compliance with the License. 5 | # You may obtain a copy of the License at 6 | # 7 | # http://www.apache.org/licenses/LICENSE-2.0 8 | # 9 | # Unless required by applicable law or agreed to in writing, software 10 | # distributed under the License is distributed on an "AS IS" BASIS, 11 | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 | # See the License for the specific language governing permissions and 13 | # limitations under the License. 14 | 15 | FROM resin/rpi-raspbian:wheezy 16 | 17 | RUN apt-get update 18 | RUN apt-get -yy -q install iptables ca-certificates 19 | 20 | COPY hyperkube /hyperkube 21 | -------------------------------------------------------------------------------- /pause/pause.go: -------------------------------------------------------------------------------- 1 | // +build linux 2 | 3 | /* 4 | Copyright 2014 The Kubernetes Authors All rights reserved. 5 | Licensed under the Apache License, Version 2.0 (the "License"); 6 | you may not use this file except in compliance with the License. 7 | You may obtain a copy of the License at 8 | http://www.apache.org/licenses/LICENSE-2.0 9 | Unless required by applicable law or agreed to in writing, software 10 | distributed under the License is distributed on an "AS IS" BASIS, 11 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 | See the License for the specific language governing permissions and 13 | limitations under the License. 14 | */ 15 | 16 | package main 17 | 18 | import ( 19 | "os" 20 | "os/signal" 21 | "syscall" 22 | ) 23 | 24 | func main() { 25 | c := make(chan os.Signal, 1) 26 | signal.Notify(c, os.Interrupt, os.Kill, syscall.SIGTERM) 27 | 28 | // Block until a signal is received. 29 | <-c 30 | } 31 | -------------------------------------------------------------------------------- /kube-proxy.yaml: -------------------------------------------------------------------------------- 1 | # Copyright 2015 Skippbox, Ltd 2 | # Licensed under the Apache License, Version 2.0 (the "License"); 3 | # you may not use this file except in compliance with the License. 4 | # You may obtain a copy of the License at 5 | # 6 | # http://www.apache.org/licenses/LICENSE-2.0 7 | # 8 | # Unless required by applicable law or agreed to in writing, software 9 | # distributed under the License is distributed on an "AS IS" BASIS, 10 | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 11 | # See the License for the specific language governing permissions and 12 | # limitations under the License. 13 | 14 | apiVersion: v1 15 | kind: Pod 16 | metadata: 17 | name: kube-system 18 | spec: 19 | hostNetwork: true 20 | containers: 21 | - name: "kube-proxy" 22 | image: "hyperkube" 23 | args: 24 | - "/hyperkube" 25 | - "proxy" 26 | - "--master=http://rpi-master:8080" 27 | - "--v=2" 28 | securityContext: 29 | privileged: true 30 | -------------------------------------------------------------------------------- /Dockerfile.etcd: -------------------------------------------------------------------------------- 1 | # Copyright 2015 Skippbox, Ltd 2 | # Licensed under the Apache License, Version 2.0 (the "License"); 3 | # you may not use this file except in compliance with the License. 4 | # You may obtain a copy of the License at 5 | # 6 | # http://www.apache.org/licenses/LICENSE-2.0 7 | # 8 | # Unless required by applicable law or agreed to in writing, software 9 | # distributed under the License is distributed on an "AS IS" BASIS, 10 | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 11 | # See the License for the specific language governing permissions and 12 | # limitations under the License. 13 | 14 | FROM hypriot/rpi-golang 15 | 16 | RUN mkdir -p /go/src/app 17 | RUN mkdir -p /var/lib/etcd 18 | WORKDIR /go/src/app 19 | ENV ETCD_UNSUPPORTED_ARCH="arm" 20 | 21 | # this will ideally be built by the ONBUILD below ;) 22 | CMD ["go-wrapper", "run"] 23 | 24 | COPY . /go/src/app 25 | RUN mv /go/src/app/go-wrapper /goroot/bin/go-wrapper 26 | RUN chmod +x /goroot/bin/go-wrapper 27 | RUN go-wrapper download 28 | RUN go-wrapper install 29 | 30 | ENTRYPOINT ["etcd"] 31 | 32 | EXPOSE 4001 7001 2379 2380 33 | -------------------------------------------------------------------------------- /kubernetes.yaml: -------------------------------------------------------------------------------- 1 | # Copyright 2015 Skippbox, Ltd 2 | # Licensed under the Apache License, Version 2.0 (the "License"); 3 | # you may not use this file except in compliance with the License. 4 | # You may obtain a copy of the License at 5 | # 6 | # http://www.apache.org/licenses/LICENSE-2.0 7 | # 8 | # Unless required by applicable law or agreed to in writing, software 9 | # distributed under the License is distributed on an "AS IS" BASIS, 10 | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 11 | # See the License for the specific language governing permissions and 12 | # limitations under the License. 13 | 14 | apiVersion: v1 15 | kind: Pod 16 | metadata: 17 | name: kube-controller 18 | spec: 19 | hostNetwork: true 20 | containers: 21 | - name: "etcd" 22 | image: "etcd" 23 | args: 24 | - "--data-dir=/var/lib/etcd" 25 | - "--advertise-client-urls=http://127.0.0.1:2379" 26 | - "--listen-client-urls=http://127.0.0.1:2379" 27 | - "--listen-peer-urls=http://127.0.0.1:2380" 28 | - "--name=etcd" 29 | - name: "kube-apiserver" 30 | image: "hyperkube" 31 | args: 32 | - "/hyperkube" 33 | - "apiserver" 34 | - "--allow-privileged=true" 35 | - "--etcd-servers=http://127.0.0.1:2379" 36 | - "--insecure-bind-address=0.0.0.0" 37 | - "--service-cluster-ip-range=10.200.20.0/24" 38 | - "--v=2" 39 | - name: "kube-controller-manager" 40 | image: "hyperkube" 41 | args: 42 | - "/hyperkube" 43 | - "controller-manager" 44 | - "--master=http://127.0.0.1:8080" 45 | - "--v=2" 46 | - name: "kube-scheduler" 47 | image: "hyperkube" 48 | args: 49 | - "/hyperkube" 50 | - "scheduler" 51 | - "--master=http://127.0.0.1:8080" 52 | - "--v=2" 53 | - name: "kube-proxy" 54 | image: "hyperkube" 55 | args: 56 | - "/hyperkube" 57 | - "proxy" 58 | - "--master=http://127.0.0.1:8080" 59 | - "--v=2" 60 | securityContext: 61 | privileged: true 62 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | 16 | 17 | Kubernetes on RaspberryPI 18 | ========================= 19 | 20 | This sets up a one node Kubernetes cluster on a RaspberryPI. This is based on the [Hypriot](http://blog.hypriot.com) Docker image for RPi. 21 | 22 | Why ? Because it is the easiest way to start experimenting with containers on ARM architectures which can be extremely useful for the IoT and Embedded business. 23 | It can also be a great platform to investigate scalability issues of both Docker and Kubernetes. 24 | 25 | Requirements 26 | ------------ 27 | 28 | You will need a RaspberryPi and you will need to have installed the Hypriot OS [image](http://blog.hypriot.com/getting-started-with-docker-on-your-arm-device/) on it 29 | 30 | For the impatient: 31 | ------------------ 32 | 33 | 1. Clone this repository on your Pi 34 | 35 | `$ git clone git@github.com:Project31/kubernetes-installer-rpi.git` 36 | 37 | `$ cd ./kubernetes-installer-rpi` 38 | 39 | 2. Install a master `build-master.sh` script 40 | 41 | `$ ./build-master.sh` 42 | 43 | 3. On a different RPi install a node `build-node.sh` script 44 | 45 | The longer version: 46 | ------------------- 47 | 48 | We use the Kubernetes `kubelet` running as a systemd unit to monitor a few Docker containers that make up the Kubernetes _cluster_. 49 | The Kubelet binary for ARM is downloaded and installed in `/usr/bin/kubelet`, a manifest is copied to `/etc/kubernetes/manifests/kubernetes.yaml` which represents a Kubernetes Pod that make up all the required containers. 50 | 51 | In this pod we have: 52 | 53 | 1. An `etcd` container. Which we run by building an etcd image from scratch on the PI. 54 | 2. Several containers based on the Hyperkube image. Hyperkube is a single binary that can start all the Kubernetes components: API server, controller, scheduler. 55 | We build a local Hyperkube image. 56 | 3. Then a little trick. Kubernetes does assume that you will run the nodes on x86_64 and automatically pulls an image called the _pause_ container. This container is used to get an IP and share that IP with all the containers in the pod. For the PI, we need to run this pause container on ARM, we trick Kubernetes by building the image `gcr.io/google_containers/pause:0.8.0` locally after having compiled the pause Golang code for ARM. 57 | 4. Finally, we download the Kubernetes client `kubectl` for ARM from the official release: 58 | 59 | `$ curl -fsSL -o kubectl https://storage.googleapis.com/kubernetes-release/release/v1.0.3/bin/linux/arm/kubectl` 60 | 61 | The ARM binaries for the `kubelet` and `hyperkube` are downloaded from https://github.com/Project31/kubernetes-arm 62 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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