Merge pull request #39196 from atiratree/pdbs-arbitrary-controllers
PDBs: mention scale subresource in Arbitrary Controllers and Selectorspull/41993/head
commit
b55e8bcaf5
|
@ -56,7 +56,7 @@ is enabled.
|
|||
|
||||
You can also use PDBs with pods which are not controlled by one of the above
|
||||
controllers, or arbitrary groups of pods, but there are some restrictions,
|
||||
described in [Arbitrary Controllers and Selectors](#arbitrary-controllers-and-selectors).
|
||||
described in [Arbitrary workloads and arbitrary selectors](#arbitrary-controllers-and-selectors).
|
||||
|
||||
## Think about how your application reacts to disruptions
|
||||
|
||||
|
@ -283,19 +283,24 @@ Policies:
|
|||
Pods in `Pending`, `Succeeded` or `Failed` phase are always considered for eviction.
|
||||
{{< /note >}}
|
||||
|
||||
## Arbitrary Controllers and Selectors
|
||||
## Arbitrary workloads and arbitrary selectors {#arbitrary-controllers-and-selectors}
|
||||
|
||||
You can skip this section if you only use PDBs with the built-in
|
||||
application controllers (Deployment, ReplicationController, ReplicaSet, and StatefulSet),
|
||||
with the PDB selector matching the controller's selector.
|
||||
workload resources (Deployment, ReplicaSet, StatefulSet and ReplicationController)
|
||||
or with {{< glossary_tooltip term_id="CustomResourceDefinition" text="custom resources" >}}
|
||||
that implement a `scale` [subresource](/docs/concepts/extend-kubernetes/api-extension/custom-resources/#advanced-features-and-flexibility),
|
||||
and where the PDB selector exactly matches the selector of the Pod's owning resource.
|
||||
|
||||
You can use a PDB with pods controlled by another type of controller, by an
|
||||
You can use a PDB with pods controlled by another resource, by an
|
||||
"operator", or bare pods, but with these restrictions:
|
||||
|
||||
- only `.spec.minAvailable` can be used, not `.spec.maxUnavailable`.
|
||||
- only an integer value can be used with `.spec.minAvailable`, not a percentage.
|
||||
|
||||
You can use a selector which selects a subset or superset of the pods belonging to a built-in
|
||||
controller. The eviction API will disallow eviction of any pod covered by multiple PDBs,
|
||||
It is not possible to use other availability configurations,
|
||||
because Kubernetes cannot derive a total number of pods without a supported owning resource.
|
||||
|
||||
You can use a selector which selects a subset or superset of the pods belonging to a
|
||||
workload resource. The eviction API will disallow eviction of any pod covered by multiple PDBs,
|
||||
so most users will want to avoid overlapping selectors. One reasonable use of overlapping
|
||||
PDBs is when pods are being transitioned from one PDB to another.
|
||||
|
|
Loading…
Reference in New Issue