k8s-on-openstack

An opinionated way to deploy a Kubernetes cluster on top of an OpenStack cloud.

It is based on the following tools:

• kubeadm
• ansible

Getting started

The following mandatory environment variables need to be set before calling ansible-playbook:

• OS_*: standard OpenStack environment variables such as OS_AUTH_URL, OS_USERNAME, ...
• KEY: name of an existing SSH keypair

The following optional environment variables can also be set:

• NAME: name of the Kubernetes cluster, used to derive instance names, kubectl configuration and security group name
• IMAGE: name of an existing Ubuntu 16.04 image
• EXTERNAL_NETWORK: name of the neutron external network, defaults to 'public'
• FLOATING_IP_POOL: name of the floating IP pool
• FLOATING_IP_NETWORK_UUID: uuid of the floating IP network (required for LBaaSv2)
• NODE_MEMORY: how many MB of memory should nodes have, defaults to 4GB
• NODE_COUNT: how many nodes should we provision, defaults to 3
• MASTER_BOOT_FROM_VOLUME: boot the master instance on a volume for data persistence, defaults to True
• MASTER_TERMINATE_VOLUME: delete the volume when master instance is destroy, defaults to True
• MASTER_VOLUME_SIZE: size of the master volume
• MASTER_MEMORY: how many MB of memory should master have, defaults to 4 GB

Spin up a new cluster:

$ ansible-playbook site.yaml

Destroy the cluster:

$ ansible-playbook destroy.yaml

Prerequisites

• Ansible (tested with version 2.4 but probably also works with older ones)
• Shade library required by Ansible OpenStack modules (python-shade for Debian)

CI/CD

The following environment variables needs to be defined:

• OS_AUTH_URL
• OS_PASSWORD
• OS_USERNAME
• OS_DOMAIN_NAME

Authors

• François Deppierraz francois.deppierraz@infraly.ch
• Oli Schacher oli.schacher@switch.ch
• Saverio Proto saverio.proto@switch.ch

References

• https://kubernetes.io/docs/getting-started-guides/kubeadm/
• https://www.weave.works/docs/net/latest/kube-addon/
• https://github.com/kubernetes/dashboard#kubernetes-dashboard