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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
  • weave-net

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:

  • STATE: set to present by default and must be set to absent to destroy the cluster
  • 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
  • NETWORK: name of the network to which instances should be connected
  • SUBNET_UUID: UUID of the subnet to which instances should be connected (required for LBaaSv2)
  • 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:

$ STATE=absent ansible-playbook site.yaml

CI/CD

The following environment variables needs to be defined:

  • OS_AUTH_URL
  • OS_PASSWORD
  • OS_USERNAME

Author

References