some stuff for create and reset cluster, storageclasses and cassandra statefulset setup

Author: Yannic Nevado Hidalgo

cassandra-statefulset/cassandra-statefulset.yaml

@@ -0,0 +1,92 @@
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: cassandra
+  labels:
+    app: cassandra
+spec:
+  serviceName: cassandra
+  replicas: 2
+  selector:
+    matchLabels:
+      app: cassandra
+  template:
+    metadata:
+      labels:
+        app: cassandra
+    spec:
+      terminationGracePeriodSeconds: 1800
+      containers:
+      - name: cassandra
+        image: gcr.io/google-samples/cassandra:v13
+        imagePullPolicy: Always
+        ports:
+        - containerPort: 7000
+          name: intra-node
+        - containerPort: 7001
+          name: tls-intra-node
+        - containerPort: 7199
+          name: jmx
+        - containerPort: 9042
+          name: cql
+        resources:
+          limits:
+            cpu: "500m"
+            memory: 1Gi
+          requests:
+            cpu: "500m"
+            memory: 1Gi
+        securityContext:
+          capabilities:
+            add:
+              - IPC_LOCK
+        lifecycle:
+          preStop:
+            exec:
+              command: 
+              - /bin/sh
+              - -c
+              - nodetool drain
+        env:
+          - name: MAX_HEAP_SIZE
+            value: 512M
+          - name: HEAP_NEWSIZE
+            value: 100M
+          - name: CASSANDRA_SEEDS
+            value: "cassandra-0.cassandra.default.svc.cluster.local"
+          - name: CASSANDRA_CLUSTER_NAME
+            value: "K8Demo"
+          - name: CASSANDRA_DC
+            value: "DC1-K8Demo"
+          - name: CASSANDRA_RACK
+            value: "Rack1-K8Demo"
+          - name: POD_IP
+            valueFrom:
+              fieldRef:
+                fieldPath: status.podIP
+        readinessProbe:
+          exec:
+            command:
+            - /bin/bash
+            - -c
+            - /ready-probe.sh
+          initialDelaySeconds: 15
+          timeoutSeconds: 5
+        # These volume mounts are persistent. They are like inline claims,
+        # but not exactly because the names need to match exactly one of
+        # the stateful pod volumes.
+        volumeMounts:
+        - name: cassandra-data
+          mountPath: /cassandra_data
+  # These are converted to volume claims by the controller
+  # and mounted at the paths mentioned above.
+  # do not use these in production until ssd GCEPersistentDisk or other ssd pd
+  volumeClaimTemplates:
+  - metadata:
+      name: cassandra-data
+    spec:
+      accessModes: [ "ReadWriteOnce" ]
+      storageClassName: standard
+      resources:
+        requests:
+          storage: 1Gi

create_operator_setup.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+
+set -x
+
+kubectl create -f manifests/configmap.yaml --namespace zalando-postgres
+
+kubectl create -f manifests/operator-service-account-rbac.yaml --namespace zalando-postgres
+
+kubectl create -f manifests/postgres-operator.yaml --namespace zalando-postgres
+
+sleep 5
+
+kubectl get pod -l name=postgres-operator --namespace zalando-postgres
+
+kubectl create -f manifests/minimal-postgres-manifest.yaml --namespace zalando-postgres

manifests/minimal-postgres-manifest.yaml

@@ -8,7 +8,7 @@ metadata:
   # name of the pod
   # podtemplate is statefulset -> every instance has the same name with own ordinalindex
   name: acid-minimal-cluster
-  # namespace in k82 where the pods will be created
+  # namespace in k8s where the pods will be created
   namespace: zalando-postgres
 spec:
   # required parameter from patroni

reset_postgres_operator_setup.sh

@@ -0,0 +1,17 @@
+#!/bin/sh
+
+set -x
+
+kubectl delete clusterroles zalando-postgres-operator -n zalando-postgres
+
+kubectl delete clusterrolebindings zalando-postgres-operator -n zalando-postgres
+
+kubectl delete serviceaccounts  zalando-postgres-operator -n zalando-postgres
+
+kubectl delete secrets foo-user.acid-minimal-cluster.credentials postgres.acid-minimal-cluster.credentials standby.acid-minimal-cluster.credentials zalando.acid-minimal-cluster.credentials -n zalando-postgres
+
+kubectl delete configmaps postgres-operator -n zalando-postgres
+
+kubectl delete postgresql acid-minimal-cluster --namespace zalando-postgres
+
+kubectl delete service acid-minimal-cluster acid-minimal-cluster-repl -n zalando-postgres

storageclasses_longhorn/default.yml

@@ -0,0 +1,12 @@
+kind: StorageClass
+apiVersion: storage.k8s.io/v1
+metadata:
+  name: standard
+  annotations:
+    storageclass.beta.kubernetes.io/is-default-class: "true"
+provisioner: driver.longhorn.io
+parameters:
+  numberOfReplicas: "2"
+  staleReplicaTimeout: "30"
+  fromBackup: ""
+  recurringJobs: '[{"name":"backup", "task":"backup", "cron":"5 2 * * *", "retain":7},{"name":"week", "task":"backup", "cron":"15 2 * * 0", "retain":5},{"name":"month", "task":"backup", "cron":"25 2 1 * *", "retain":6}]'

storageclasses_longhorn/reduced-redundancy.yml

@@ -0,0 +1,9 @@
+kind: StorageClass
+apiVersion: storage.k8s.io/v1
+metadata:
+  name: reduced-redundancy
+provisioner: driver.longhorn.io
+parameters:
+  numberOfReplicas: "1"
+  staleReplicaTimeout: "30"
+  fromBackup: ""