A role that deploys a statuful set containing elasticsearch on a kubernetes cluster running on AWS.

This role depends on you having a kubernetes cluster. It uses a headless service for discovery of elasticsearch nodes.

The following variables should be set before using this role:

• k8s_cluster: The name of the cluster you want to deploy to
• k8s_namespace: The namespace to deploy elasticsearch in. Default is elasticsearch
• elasticsearch_image: Find a list of elasticsearch docker images here
• elasticsearch_image_version: defaults to 5.2.1

For more variables you can override, look into defaults/main.yml

For rolling upgrade the upgrade strategy is set to on delete. Follow the instruction on elasticsearch site to make the rolling upgrade fast:

https://www.elastic.co/guide/en/elasticsearch/reference/current/rolling-upgrades.html

Don't forget to update the currently elected master last. As a master reelection has a bit of downtime. When deleting the master first a new node gets elected that will later be shut down again. Making this downtime happen twice.