Merge pull request #188 from vovtz/patch-1

#187 Check `Capabilities` to render `PodDisruptionBudget` manifest

Author: joejulian

charts/redpanda/Chart.yaml

@@ -23,13 +23,9 @@ type: application
 # The chart version and the app version are not the same and will not track
 # together. The chart version is a semver representation of changes to this
 # chart.
-version: 2.3.8
+version: 2.3.9
 # The app version is the default version of Redpanda to install.
 appVersion: v22.3.3
-# kubeVersion must be suffixed with "-0" to be able to match cloud providers
-# kubernetes versions like "v1.23.8-gke.1900". Their suffix is interpreted as a
-# pre-release. Our "-0" allows pre-releases to be matched.
-kubeVersion: "^1.21.0-0"
 icon: https://images.ctfassets.net/paqvtpyf8rwu/3cYHw5UzhXCbKuR24GDFGO/73fb682e6157d11c10d5b2b5da1d5af0/skate-stand-panda.svg
 sources:
   - https://github.com/redpanda-data/helm-charts

charts/redpanda/templates/poddisruptionbudget.yaml

@@ -15,6 +15,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */}}
 
+{{- if .Capabilities.APIVersions.Has "policy/v1/PodDisruptionBudget" }}
 apiVersion: policy/v1
 kind: PodDisruptionBudget
 metadata:
@@ -35,3 +36,6 @@ spec:
       app.kubernetes.io/name: {{ template "redpanda.name" . }}
       app.kubernetes.io/instance: {{ .Release.Name | quote }}
   maxUnavailable: {{ .Values.statefulset.budget.maxUnavailable | int64 }}
+{{- else if (not .Values.ephemeralUsage.enabled) }}
+{{- fail "You must use Kubernetes 1.21+ for a production cluster. If you're not using this in production and you know why doing this is a bad idea, you can set 'ephemeralUsage.enabled=false' to continue." }}
+{{- end }}

charts/redpanda/values.yaml

@@ -466,6 +466,13 @@ listeners:
         # This listener port will be used for the external port if this is not included
         nodePort: 30081
 
+### Non-production usage
+#
+# ephemeralUsage - Enabling this key relaxes some properties related to high availability, like the
+#   implementation of a PodDisruptionBudget (this enables deployment onto older K8s versions as well)
+ephemeralUsage:
+  enabled: false
+
 # Expert Config
 
 # This section contains various settings supported by Redpanda that may not work