Drop support for Kube 1.25 and 1.26

Signed-off-by: Jakub Scholz <www@scholzj.com>

Author: scholzj

.azure/scripts/setup-kubernetes.sh

@@ -3,7 +3,7 @@ set -xe
 
 rm -rf ~/.kube
 
-KUBE_VERSION=${KUBE_VERSION:-1.25.0}
+KUBE_VERSION=${KUBE_VERSION:-1.27.0}
 MINIKUBE_REGISTRY_IMAGE=${REGISTRY_IMAGE:-"registry"}
 COPY_DOCKER_LOGIN=${COPY_DOCKER_LOGIN:-"false"}
 
@@ -66,6 +66,7 @@ if [ "$TEST_CLUSTER" = "minikube" ]; then
     export KUBECONFIG=$HOME/.kube/config
     # We can turn on network polices support by adding the following options --cni=calico
     # However, it seems not working properly with kube 1.25, we should revisit it once we drop it
+    # Covered by https://github.com/strimzi/strimzi-kafka-operator/issues/11639
     minikube start --driver=docker --kubernetes-version=${KUBE_VERSION} \
       --insecure-registry=localhost:5000 --extra-config=apiserver.authorization-mode=Node,RBAC \
       --cpus=${MINIKUBE_CPU} --memory=${MINIKUBE_MEMORY} --force

.azure/templates/steps/default_variables.yaml

@@ -22,7 +22,7 @@ variables:
   repo_slug: $(Build.Repository.Name)
   commit_message: $(Build.SourceVersionMessage)
   test_cluster: minikube
-  test_kubectl_version: v1.25.0
+  test_kubectl_version: v1.27.0
   strimzi_default_log_level: DEBUG
   operator_image_pull_policy: IfNotPresent
   components_image_pull_policy: IfNotPresent

.azure/templates/steps/prerequisites/install_minikube.yaml

@@ -3,5 +3,5 @@ steps:
     displayName: "Setup Minikube cluster"
     env:
       TEST_CLUSTER: minikube
-      TEST_KUBECTL_VERSION: v1.25.0
+      TEST_KUBECTL_VERSION: v1.27.0
       TEST_MINIKUBE_VERSION: v1.36.0

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -46,7 +46,7 @@ body:
     attributes:
       label: Kubernetes version
       description: Kubernetes version where the bug occurred
-      placeholder: e.g. Kubernetes 1.25, OpenShift 4.11
+      placeholder: e.g. Kubernetes 1.27, OpenShift 4.11
     validations:
       required: true
   - type: input

CHANGELOG.md

@@ -4,6 +4,11 @@
 
 * n/a
 
+### Changes, deprecations and removals
+
+* **From Strimzi 0.48.0 on, we support only Kubernetes 1.27 and newer.**
+  Kubernetes 1.25 and 1.26 are not supported anymore.
+
 ## 0.47.0
 
 * Adding progress tracking for Cruise Control rebalances

api/pom.xml

@@ -225,7 +225,7 @@
                                 <argument>io.strimzi.crdgenerator.DocGenerator</argument>
                                 <argument>--linker</argument>
                                 <argument>io.strimzi.crdgenerator.KubeLinker</argument>
-                                <argument>https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.25/</argument>
+                                <argument>https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.27/</argument>
                                 <argument>modules/appendix_crds.adoc</argument>
                                 <argument>io.strimzi.api.kafka.model.kafka.Kafka</argument>
                                 <argument>io.strimzi.api.kafka.model.connect.KafkaConnect</argument>

api/src/main/java/io/strimzi/platform/KubernetesVersion.java

@@ -13,9 +13,9 @@ public class KubernetesVersion implements Comparable<KubernetesVersion> {
 
     // Notable Kubernetes versions => this includes the minimal supported version and for example also any Kubernetes
     // versions from some features are supported.
-    public static final KubernetesVersion V1_25 = new KubernetesVersion(1, 25);
+    public static final KubernetesVersion V1_27 = new KubernetesVersion(1, 27);
 
-    public static final KubernetesVersion MINIMAL_SUPPORTED_VERSION = V1_25;
+    public static final KubernetesVersion MINIMAL_SUPPORTED_VERSION = V1_27;
     public static final int MINIMAL_SUPPORTED_MAJOR = MINIMAL_SUPPORTED_VERSION.major;
     public static final int MINIMAL_SUPPORTED_MINOR = MINIMAL_SUPPORTED_VERSION.minor;
 

crd-generator/src/main/java/io/strimzi/crdgenerator/annotations/Crd.java

@@ -142,7 +142,7 @@ Subresources subresources() default @Subresources(
 
             /**
              * The scale subresource of a custom resources that this is the definition for.
-             * @see <a href="https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.25/#customresourcesubresourcescale-v1-apiextensions-k8s-io">Kubernetes 1.25 API documtation</a>
+             * @see <a href="https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.27/#customresourcesubresourcescale-v1-apiextensions-k8s-io">Kubernetes 1.27 API documtation</a>
              */
             @interface Scale {
                 /**

documentation/modules/appendix_crds.adoc

@@ -18,7 +18,7 @@
 :ProductVersionPrevious: 0.47.0
 
 // Kubernetes versions
-:KubernetesVersion: 1.25 and later
+:KubernetesVersion: 1.27 and later
 
 // Kafka upgrade attributes used in kafka upgrades section
 :DefaultKafkaVersion: 4.0.0
@@ -75,7 +75,7 @@
 :K8sMeaningOfMemory: link:https://kubernetes.io/docs/concepts/configuration/manage-compute-resources-container/#meaning-of-memory[Meaning of memory^]
 :K8sManagingComputingResources: link:https://kubernetes.io/docs/concepts/configuration/manage-compute-resources-container/[Managing Compute Resources for Containers^]
 :K8sLivenessReadinessProbes: link:https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-probes/[Configure Liveness and Readiness Probes^]
-:K8sNetworkPolicyPeerAPI: link:https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.25/#networkpolicypeer-v1-networking-k8s-io[NetworkPolicyPeer API reference^]
+:K8sNetworkPolicyPeerAPI: link:https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.27/#networkpolicypeer-v1-networking-k8s-io[NetworkPolicyPeer API reference^]
 :K8sImagePullPolicies: link:https://kubernetes.io/docs/concepts/containers/images/#updating-images[Disruptions^]
 :K8sCRDs: link:https://kubernetes.io/docs/tasks/access-kubernetes-api/custom-resources/custom-resource-definitions/[Extend the Kubernetes API with CustomResourceDefinitions^]
 :K8sResizingPersistentVolumesUsingKubernetes: link:https://kubernetes.io/blog/2018/07/12/resizing-persistent-volumes-using-kubernetes/[Resizing Persistent Volumes using Kubernetes^]