public_git
/
postgres-operator
mirror of https://github.com/zalando/postgres-operator.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

address review comments

This commit is contained in:
Felix Kunde 2019-06-17 17:39:00 +02:00
parent 16b167b76c
commit d2a63f334c
1 changed files with 5 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
docs/administrator.md
View File

@ -158,15 +158,17 @@ data:
By default the operator uses a PodDisruptionBudget (PDB) to protect the cluster
from voluntarily disruptions and hence unwanted DB downtime. The `MinAvailable`
parameter of the PDB is set to `1` which makes it work for single-node clusters
or in situations when there is no master (e.g. standby clusters).
parameter of the PDB is set to `1` which prevents killing masters in single-node
clusters and/or the last remaining running instance in a multi-node cluster.
The PDB is only relaxed in two scenarios:
* If a cluster is scaled down to `0` instances (e.g. for draining nodes)
* If the PDB is disabled in the configuration (`enable_pod_disruption_budget`)
The PDB is still in place having `MinAvailable` set to `0`. If enabled it will
be automatically set to `1` on scale up.
be automatically set to `1` on scale up. Disabling PDBs helps avoiding blocking
Kubernetes upgrades in managed K8s environments at the cost of prolonged DB
downtime. See PR #384 for the use case.
### Add cluster-specific labels