Skip to content
This repository has been archived by the owner on Nov 9, 2021. It is now read-only.

Commit

Permalink
Removing Deprecated Command; rak8s.io Move
Browse files Browse the repository at this point in the history
Signed-off-by: Chris Short <[email protected]>
  • Loading branch information
chris-short committed Jan 16, 2018
1 parent 4fe2f5c commit 48c28ab
Show file tree
Hide file tree
Showing 3 changed files with 87 additions and 9 deletions.
92 changes: 85 additions & 7 deletions README.md
Original file line number Diff line number Diff line change
@@ -1,23 +1,101 @@
# rak8s (pronounced rackets - /ˈrækɪts/)

## Stand up a Raspberry Pi based Kubernetes cluster with Ansible
Stand up a Raspberry Pi based Kubernetes cluster with Ansible

### Why?
## Why?

Because Raspberry Pis are rad, Ansible is awesome, and Kubernetes is keen!
* Raspberry Pis are rad
* Ansible is awesome
* Kubernetes is keen

Also, it's cheaper than a year of GKE. Plus, why not run Kubernetes in your home?

# Prerequisites

## Hardware

* Raspberry Pi 3 (3 or more)
* [Raspbian Lite](https://www.raspberrypi.org/downloads/raspbian/)
* Raspberry Pis should have static IPs (requirement for Kubernetes and Ansible inventory)
* Class 10 SD Cards
* Network connection (wireless or wired) with access to the internet

## Software

* [Raspbian Lite](https://www.raspberrypi.org/downloads/raspbian/) (installed on each Raspberry Pi)

* Raspberry Pis should have static IPs
* Requirement for Kubernetes and Ansible inventory
* You can set these via OS configuration or DHCP reservations (your choice)

* Ability to SSH into all Raspberry Pis and escalate privileges with sudo
* The pi user is fine just change its password
* The pi user is fine just change its password

* [Ansible](http://docs.ansible.com/ansible/latest/intro_installation.html) 2.2 or higher

# Recommendations
* [`kubectl`](https://kubernetes.io/docs/tasks/tools/install-kubectl/) should be available on the system you intend to use to interact with the Kubernetes cluster.
* If you are going to login to one of the Raspberry Pis to interact with the cluster `kubectl` is installed and configured by default on the master Kubernetes master.
* If you are administering the cluster from a remote machine (your laptop, desktop, server, bastion host, etc.) `kubectl` will not be installed on the remote machine but it will be configured to interact with the newly built cluster once `kubectl` is installed.

## Recommendations

* Since Raspbian Lite is being used it's recommended that the video memory of the Raspberry Pi 3s be set to its lowest setting (16 MB).
* Setup SSH key pairs so your password is not required every time Ansible runs

# Stand Up Your Kubernetes Cluster

## Download the latest release or clone the repo:

```
git clone https://github.com/rak8s/rak8s.git
```

## Modify ansible.cfg and inventory

Modify the `inventory` file to suit your environment. Change the names to your liking and the IPs to the addresses of your Raspberry Pis.

If your SSH user on the Raspberry Pis are not the Raspbian default `pi` user modify `remote_user` in the `ansible.cfg`.

## Confirm Ansible is working with your Raspberry Pis:

```ansible -m ping all```

## Deploy, Deploy, Deploy

```ansible-playbook cluster.yml```

# Interact with Kubernetes

## CLI

Test your Kubernetes cluster is up and running:

```kubectl get nodes```

The output should look something like this:

```
NAME STATUS ROLES AGE VERSION
pik8s000 Ready master 2d v1.9.1
pik8s001 Ready <none> 2d v1.9.1
pik8s002 Ready <none> 2d v1.9.1
pik8s003 Ready <none> 2d v1.9.1
pik8s005 Ready <none> 2d v1.9.1
pik8s004 Ready <none> 2d v1.9.1
```

## Dashboard

rak8s installs the non-HTTPS version of the Kubernetes dashboard. This is not recommended for production clusters but, it simplifies the setup. Access the dashboard by running:

```kubectl proxy```

Then open a web browser and navigate to:
[http://localhost:8001/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy/](http://localhost:8001/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy/)

# Etymology

**rak8s** (pronounced rackets - /ˈrækɪts/)

Coined by [Kendrick Coleman](https://github.com/kacole2) on [13 Jan 2018](https://twitter.com/KendrickColeman/status/952242602690129921)

# References & Credits

Expand Down
2 changes: 1 addition & 1 deletion roles/master/tasks/main.yml
Original file line number Diff line number Diff line change
Expand Up @@ -28,7 +28,7 @@
when: kubeadm_init

- name: Join Kubernetes Cluster
shell: kubeadm join --skip-preflight-checks --token {{ token }} {{ groups['master'][0] }}:6443 --discovery-token-unsafe-skip-ca-verification
shell: kubeadm join --ignore-preflight-errors=all --token {{ token }} {{ groups['master'][0] }}:6443 --discovery-token-unsafe-skip-ca-verification
when: kubeadm_reset|succeeded
register: kubeadm_join

Expand Down
2 changes: 1 addition & 1 deletion roles/workers/tasks/main.yml
Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,7 @@
register: kubeadm_reset

- name: Join Kubernetes Cluster
shell: kubeadm join --skip-preflight-checks --token {{ token }} {{ groups['master'][0] }}:6443 --discovery-token-unsafe-skip-ca-verification
shell: kubeadm join --ignore-preflight-errors=all --token {{ token }} {{ groups['master'][0] }}:6443 --discovery-token-unsafe-skip-ca-verification
when: kubeadm_reset|succeeded
register: kubeadm_join

Expand Down

0 comments on commit 48c28ab

Please sign in to comment.