Use Persistent Volumes by default for ES nodes #913
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nkvoll
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Jun 8, 2019
By default they will get a 1Gi volume, which is chosen because matches roughly 1:1 vs the default heap.
Users can opt out of this behavior by specifying the data volume in the Elasticsearch resource directly
```yaml
apiVersion: elasticsearch.k8s.elastic.co/v1alpha1
kind: Elasticsearch
metadata:
name: elasticsearch-sample
spec:
version: "7.1.0"
nodes:
- nodeCount: 1
podTemplate:
spec:
volumes:
- name: elasticsearch-data
emptyDir: {}
```
Builds on top of elastic#1024
Closes: elastic#913
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By default, we're currently using
emptyDir, which isn't particularly suitable for ES. The tradeoff is generally thatemptyDiris not safe,PersistentVolumesby default may have worse performance.Since most (all?) K8s distributions come with a default storage class, we can make it the default (i.e if nothing regarding data volumes are specified, we'll create a PVC).
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