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Add PDB configuration toggle (#583)

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* Don't create an impossible disruption budget for smaller clusters.
* sync PDB also on update
This commit is contained in:
Felix Kunde
2019-06-18 10:48:21 +02:00
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parent 3553144cda
commit 6918394562
13 changed files with 205 additions and 40 deletions
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docs/administrator.md
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@@ -154,6 +154,22 @@ data:
pod_antiaffinity_topology_key: "failure-domain.beta.kubernetes.io/zone"
```
### Pod Disruption Budget
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 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. 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
In some cases, you might want to add `labels` that are specific to a given