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Change and clarify wording

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erthalion 2018-06-06 17:36:21 +02:00
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commit dab6c01cc7
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@ -246,8 +246,8 @@ Note that timezone required for `timestamp` (offset relative to UTC, see RFC
## Increase volume size ## Increase volume size
PostgreSQL operator supports statefulset volume resize if you're using the 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, operator on top of AWS. For that you need to change the size field of the
and the operator will find out that a volume size needs to be changed: volume description in the cluster manifest and apply it:
``` ```
apiVersion: "acid.zalan.do/v1" apiVersion: "acid.zalan.do/v1"
@ -260,16 +260,22 @@ spec:
size: 5Gi # new volume size size: 5Gi # new volume size
``` ```
You can only increase a volume size in this way, if a new requested size is The operator compares the new value of the size field with the previous one and
smaller than the previous one nothing will be done. After this update all the acts on differences.
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 You can only enlarge the volume with the process described above, shrinking is
not supported and will emit a warning. After this update all the new volumes in
a statefulset are allocated according to the new size. To enlarge persistent
volumes attached to the running pods, the operator performs the following
actions:
* resize an actuall filesystem use `resize2fs` * call AWS API to change the volume size
Note that if before a volume size was increased a statefulset was scaled down * connect to the pod using `kubectl exec` and resize the filesystem with
and (after the change was applied) scaled back, those pods that were down will `resize2fs`.
have an old volume size, since a statefulset doesn't delete volumes.
Fist step has a limitation, AWS rate-limits this operation to no more than once
every 6 hours.
Note that if the statefulset is scaled down before resizing the size changes
are only applied to the volumes attached to the running pods. The size of the
volumes that correspond to the previously running pods is not changed.