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Add section about volume increase

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erthalion 2018-06-05 11:42:01 +02:00
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@ -242,3 +242,34 @@ metadata:
Note that timezone required for `timestamp` (offset relative to UTC, see RFC
3339 section 5.6)
## Increase volume size
PostgreSQL operator supports statefulset volume resize if you're using the
operator on top of AWS. For that you need to apply manifest with a new size,
and the operator will find out that a volume size needs to be changed:
```
apiVersion: "acid.zalan.do/v1"
kind: postgresql
metadata:
name: acid-test-cluster
spec:
volume:
size: 5Gi # new volume size
```
You can only increase a volume size in this way, if a new requested size is
smaller than the previous one nothing will be done. After this update all the
new pods in a statefulset will be created with a new volume size. To increase a
volume size on already existing pods in a statefulset, the operator will
perform the following steps:
* modify EBS volume size
* resize an actuall filesystem use `resize2fs`
Note that if before a volume size was increased a statefulset was scaled down
and (after the change was applied) scaled back, those pods that were down will
have an old volume size, since a statefulset doesn't delete volumes.