fix: support pdb in kube 1.20

.github/actions/deploy-operator/action.yaml

@@ -16,13 +16,39 @@ runs:
   - name: Install cert-manager
     shell: bash
     run: |
+      cert_manager_version=""
+      kube_min_version=$(kubectl version --output=yaml | yq '.serverVersion.minor')
+      if [ ${kube_min_version} -le 21 ]; then
+        cert_manager_version="v1.11.5"
+      fi
+      if [ ${kube_min_version} -le 20 ]; then
+        cert_manager_version="v1.10.2"
+      fi
+      if [ ${kube_min_version} -le 19 ]; then
+        cert_manager_version="v1.8.2"
+      fi
+      if [ ${kube_min_version} -le 18 ]; then
+        cert_manager_version="v1.7.3"
+      fi
+      if [ ${kube_min_version} -le 17 ]; then
+        cert_manager_version="v1.6.3"
+      fi
+      if [ ${kube_min_version} -le 16 ]; then
+        cert_manager_version="v1.5.5"
+      fi
+      if [ ${kube_min_version} -le 15 ]; then
+        echo "Kubernetes version is too low, please upgrade to 1.15+"
+        exit 1
+      fi
+
       helm repo add jetstack https://charts.jetstack.io
       helm repo update
       helm install \
         cert-manager jetstack/cert-manager \
         --namespace cert-manager \
         --create-namespace \
-        --set installCRDs=true
+        --set installCRDs=true \
+        --version "$cert_manager_version"
   - name: Deploy operator by helm
     shell: bash
     run: |

.github/workflows/build-reloader-image.yaml

@@ -28,29 +28,29 @@ jobs:
         else
           echo "::set-output name=registry::ghcr.io"
         fi
-    - uses: docker/setup-qemu-action@v2
-    - uses: docker/setup-buildx-action@v2
-    - uses: docker/login-action@v2
+    - uses: docker/setup-qemu-action@v3
+    - uses: docker/setup-buildx-action@v3
+    - uses: docker/login-action@v3
       if: github.ref_type == 'tag'
       with:
         registry: docker.io
         username: ${{ secrets.DOCKER_HUB_USER }}
         password: ${{ secrets.DOCKER_HUB_TOKEN }}
-    - uses: docker/login-action@v2
+    - uses: docker/login-action@v3
       if: github.ref_type == 'branch'
       with:
         registry: ghcr.io
         username: ${{ github.actor }}
         password: ${{ github.token }}
-    - uses: docker/metadata-action@v4
+    - uses: docker/metadata-action@v5
       id: meta
       with:
         images: ${{ steps.registry.outputs.registry }}/${{ github.repository }}-reloader
         flavor: |
           latest=true
         tags: |
           type=semver,pattern={{version}},value=${{ steps.version.outputs.version }}
-    - uses: docker/build-push-action@v3
+    - uses: docker/build-push-action@v5
       with:
         push: true
         pull: true

.github/workflows/cts.yaml

@@ -18,6 +18,8 @@ jobs:
           - minikube
           - k3s
         kubernetes-version:
+          - "v1.20.0"
+          - "v1.21.0"
           - "v1.22.0"
           - "v1.23.0"
           - "v1.24.0"
@@ -59,17 +61,17 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
-    - uses: docker/setup-buildx-action@v2
-    - uses: docker/setup-qemu-action@v2
+    - uses: docker/setup-buildx-action@v3
+    - uses: docker/setup-qemu-action@v3
       with:
         image: tonistiigi/binfmt:latest
         platforms: all
-    - uses: docker/login-action@v2
+    - uses: docker/login-action@v3
       with:
         registry: ghcr.io
         username: ${{ github.actor }}
         password: ${{ github.token }}
-    - uses: docker/metadata-action@v4
+    - uses: docker/metadata-action@v5
       id: meta
       with:
         images: ghcr.io/${{ github.repository }}
@@ -79,7 +81,7 @@ jobs:
           type=ref,event=branch
           type=ref,event=tag
           type=semver,pattern={{version}}
-    - uses: docker/build-push-action@v3
+    - uses: docker/build-push-action@v5
       with:
         push: true
         pull: true
@@ -100,6 +102,8 @@ jobs:
           - minikube
           - k3s
         kubernetes-version:
+          - "v1.20.0"
+          - "v1.21.0"
           - "v1.22.0"
           - "v1.23.0"
           - "v1.24.0"
@@ -144,7 +148,7 @@ jobs:
       - name: Make sure all of pods can be deleted
         run: |
           kubectl delete ${{ matrix.emqx[0] }} ${{ matrix.emqx[1] }}
-          kubectl wait --for=delete pods -l "apps.emqx.io/instance=${{ matrix.emqx[1] }}"
+          kubectl wait --for=delete pods -l "apps.emqx.io/instance=${{ matrix.emqx[1] }}" --timeout=300s
       - if: failure()
         run: kubectl logs -l "control-plane=controller-manager" -n emqx-operator-system -c manager --tail=1000
       - if: failure()

.github/workflows/release.yml

@@ -26,9 +26,9 @@ jobs:
           echo "Need update appVersion for Chart.yaml"
           exit 1
         fi
-    - uses: docker/setup-qemu-action@v2
-    - uses: docker/setup-buildx-action@v2
-    - uses: docker/metadata-action@v4
+    - uses: docker/setup-qemu-action@v3
+    - uses: docker/setup-buildx-action@v3
+    - uses: docker/metadata-action@v5
       id: meta
       with:
         images: ${{ github.repository_owner }}/emqx-operator-controller
@@ -38,12 +38,12 @@ jobs:
           type=ref,event=tag
           type=semver,pattern={{version}}
           type=semver,pattern={{major}}.{{minor}}
-    - uses: docker/login-action@v2
+    - uses: docker/login-action@v3
       if: startsWith(github.ref, 'refs/tags/')
       with:
         username: ${{ secrets.DOCKER_HUB_USER }}
         password: ${{ secrets.DOCKER_HUB_TOKEN }}
-    - uses: docker/build-push-action@v3
+    - uses: docker/build-push-action@v5
       with:
         platforms: linux/amd64,linux/arm64,linux/arm/v7
         push: ${{ startsWith(github.ref, 'refs/tags/') }}

config/samples/emqx/v2beta1/emqx-full.yaml

@@ -20,7 +20,6 @@ spec:
         apps.emqx.io/instance: emqx
         apps.emqx.io/managed-by: emqx-operator
         apps.emqx.io/db-role: core
-      annotations:
     spec:
       replicas: 2
       volumeClaimTemplates:

controllers/apps/v2beta1/add_pdb.go

@@ -4,22 +4,45 @@
 	"context"
 
 	emperror "emperror.dev/errors"
+	semver "github.com/Masterminds/semver/v3"
 	appsv2beta1 "github.com/emqx/emqx-operator/apis/apps/v2beta1"
 	innerReq "github.com/emqx/emqx-operator/internal/requester"
 	"github.com/go-logr/logr"
 	policyv1 "k8s.io/api/policy/v1"
+	policyv1beta1 "k8s.io/api/policy/v1beta1"
 	k8sErrors "k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/util/intstr"
+	"k8s.io/client-go/discovery"
 	ctrl "sigs.k8s.io/controller-runtime"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+	kubeConfig "sigs.k8s.io/controller-runtime/pkg/client/config"
 )
 
 type addPdb struct {
 	*EMQXReconciler
 }
 
 func (a *addPdb) reconcile(ctx context.Context, logger logr.Logger, instance *appsv2beta1.EMQX, _ innerReq.RequesterInterface) subResult {
-	pdbList := generatePodDisruptionBudget(instance)
+	discoveryClient, _ := discovery.NewDiscoveryClientForConfig(kubeConfig.GetConfigOrDie())
+	kubeVersion, _ := discoveryClient.ServerVersion()
+	v, _ := semver.NewVersion(kubeVersion.String())
+
+	pdbList := []client.Object{}
+	if v.LessThan(semver.MustParse("1.21")) {
+		corePdb, replPdb := generatePodDisruptionBudgetV1beta1(instance)
+		pdbList = append(pdbList, corePdb)
+		if replPdb != nil {
+			pdbList = append(pdbList, replPdb)
+		}
+	} else {
+		corePdb, replPdb := generatePodDisruptionBudget(instance)
+		pdbList = append(pdbList, corePdb)
+		if replPdb != nil {
+			pdbList = append(pdbList, replPdb)
+		}
+	}
+
 	for _, pdb := range pdbList {
 		if err := ctrl.SetControllerReference(instance, pdb, a.Scheme); err != nil {
 			return subResult{err: emperror.Wrap(err, "failed to set controller reference")}
@@ -33,8 +56,7 @@
 	return subResult{}
 }
 
-func generatePodDisruptionBudget(instance *appsv2beta1.EMQX) []*policyv1.PodDisruptionBudget {
-	pdbList := []*policyv1.PodDisruptionBudget{}
+func generatePodDisruptionBudget(instance *appsv2beta1.EMQX) (*policyv1.PodDisruptionBudget, *policyv1.PodDisruptionBudget) {
 	corePdb := &policyv1.PodDisruptionBudget{
 		TypeMeta: metav1.TypeMeta{
 			APIVersion: "policy/v1",
@@ -58,15 +80,50 @@
 			},
 		},
 	}
-	pdbList = append(pdbList, corePdb)
 	if appsv2beta1.IsExistReplicant(instance) {
 		replPdb := corePdb.DeepCopy()
 		replPdb.Name = instance.ReplicantNamespacedName().Name
 		replPdb.Spec.Selector.MatchLabels = appsv2beta1.CloneAndMergeMap(
 			appsv2beta1.DefaultReplicantLabels(instance),
 			instance.Spec.ReplicantTemplate.Labels,
 		)
-		pdbList = append(pdbList, replPdb)
+		return corePdb, replPdb
+	}
+	return corePdb, nil
+}
+
+func generatePodDisruptionBudgetV1beta1(instance *appsv2beta1.EMQX) (*policyv1beta1.PodDisruptionBudget, *policyv1beta1.PodDisruptionBudget) {
+	corePdb := &policyv1beta1.PodDisruptionBudget{
+		TypeMeta: metav1.TypeMeta{
+			APIVersion: "policy/v1",
+			Kind:       "PodDisruptionBudget",
+		},
+		ObjectMeta: metav1.ObjectMeta{
+			Namespace: instance.Namespace,
+			Name:      instance.CoreNamespacedName().Name,
+			Labels:    appsv2beta1.CloneAndMergeMap(appsv2beta1.DefaultLabels(instance), instance.Labels),
+		},
+		Spec: policyv1beta1.PodDisruptionBudgetSpec{
+			Selector: &metav1.LabelSelector{
+				MatchLabels: appsv2beta1.CloneAndMergeMap(
+					appsv2beta1.DefaultCoreLabels(instance),
+					instance.Spec.CoreTemplate.Labels,
+				),
+			},
+			MinAvailable: &intstr.IntOrString{
+				Type:   intstr.Int,
+				IntVal: 1,
+			},
+		},
+	}
+	if appsv2beta1.IsExistReplicant(instance) {
+		replPdb := corePdb.DeepCopy()
+		replPdb.Name = instance.ReplicantNamespacedName().Name
+		replPdb.Spec.Selector.MatchLabels = appsv2beta1.CloneAndMergeMap(
+			appsv2beta1.DefaultReplicantLabels(instance),
+			instance.Spec.ReplicantTemplate.Labels,
+		)
+		return corePdb, replPdb
 	}
-	return pdbList
+	return corePdb, nil
 }