MintMaker: Deploy Redis for Renovate cache

Redis will be used by renovate PLRs to store and retrieve cache in order
to improve performance and decrease the number of API calls. Connection
is not password protected, but a network policy exists to restrict
access only to pods in the "mintmaker" namespace. I think that a
password is unnecessary since it would complicate the deployment and no
sensitive or important data will be stored in the database. The
persistent volume exists to back up the data so that Redis can reload it
after restart.

The memory limit was chosen somewhat arbitrarily, but we can increase it
if high use is observed over time. OOM errors should not happen since
Redis limit is configured lower than Openshift limit.

Author: querti

Diff for: components/mintmaker/base/kustomization.yaml

@@ -1,6 +1,7 @@
 resources:
 - cronjobs/
 - rbac/
+- redis-cache/
 
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization

Diff for: components/mintmaker/base/redis-cache/kustomization.yaml

@@ -0,0 +1,9 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+- redis-configmap.yaml
+- redis-deployment.yaml
+- redis-networkpolicy.yaml
+- redis-pvc.yaml
+- redis-service.yaml
+namespace: mintmaker

Diff for: components/mintmaker/base/redis-cache/redis-configmap.yaml

@@ -0,0 +1,25 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: redis-config
+  namespace: mintmaker
+data:
+  redis.conf: |
+    bind 0.0.0.0
+    protected-mode no
+    port 6379
+    maxmemory 800mb
+    maxmemory-policy allkeys-lru
+    dir /var/lib/redis/data
+
+    appendonly yes
+    aof-use-rdb-preamble yes
+    appendfsync everysec
+
+    save 900 1
+    save 300 10
+    save 60 10000
+
+    logfile ""
+    loglevel notice
+

Diff for: components/mintmaker/base/redis-cache/redis-deployment.yaml

@@ -0,0 +1,49 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: redis
+  namespace: mintmaker
+spec:
+  replicas: 1
+  strategy:
+    type: Recreate
+  selector:
+    matchLabels:
+      app: redis
+  template:
+    metadata:
+      labels:
+        app: redis
+    spec:
+      serviceAccountName: mintmaker-controller-manager
+      containers:
+        - name: redis
+          image: registry.redhat.io/rhel9/redis-7:9.5
+          ports:
+            - containerPort: 6379
+          command: ["container-entrypoint"]
+          args: ["run-redis"]
+          resources:
+            requests:
+              memory: "800Mi"
+              cpu: "0.75"
+            limits:
+              memory: "1Gi"
+              cpu: "1"
+          securityContext:
+            runAsNonRoot: true
+            runAsUser: 1001
+            readOnlyRootFilesystem: true
+          volumeMounts:
+            - name: redis-data
+              mountPath: /var/lib/redis/data
+            - name: redis-config
+              mountPath: /etc/redis/redis.conf
+              subPath: redis.conf
+      volumes:
+        - name: redis-data
+          persistentVolumeClaim:
+            claimName: redis-pvc
+        - name: redis-config
+          configMap:
+            name: redis-config

Diff for: components/mintmaker/base/redis-cache/redis-networkpolicy.yaml

@@ -0,0 +1,12 @@
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: restrict-redis-access
+  namespace: mintmaker
+spec:
+  podSelector:
+    matchLabels:
+      app: redis
+  ingress:
+  - from:
+    - podSelector: {}

Diff for: components/mintmaker/base/redis-cache/redis-pvc.yaml

@@ -0,0 +1,14 @@
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: redis-pvc
+  namespace: mintmaker
+spec:
+  accessModes:
+    - ReadWriteOnce
+  mountOptions:
+    - dir_mode=0777
+    - file_mode=0777
+  resources:
+    requests:
+      storage: 5Gi

Diff for: components/mintmaker/base/redis-cache/redis-service.yaml

@@ -0,0 +1,12 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: redis
+  namespace: mintmaker
+spec:
+  selector:
+    app: redis
+  ports:
+    - port: 6379
+      targetPort: 6379
+  type: ClusterIP