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+# Deploying MongoDB Operator with Replicated
+
+This pattern demonstrates deploying the Percona MongoDB Operator using multiple Helm charts with KOTS orchestration. The operator chart installs Custom Resource Definitions (CRDs), and the database chart deploys a MongoDB replica set cluster. Proper weight configuration ensures the operator is ready before the database deploys.
+
+## Architecture
+
+- **Operator Chart** (`psmdb-operator`): Installs the Percona MongoDB Operator and CRDs
+- **Database Chart** (`psmdb-db`): Deploys a MongoDB replica set cluster
+
+## KOTS HelmChart Configuration
+
+### Operator Chart
+
+```yaml
+apiVersion: kots.io/v1beta2
+kind: HelmChart
+metadata:
+  name: psmdb-operator
+spec:
+  chart:
+    name: psmdb-operator
+    chartVersion: 1.17.0
+    helmRepositories:
+      - name: percona
+        repository: https://percona.github.io/percona-helm-charts/
+  weight: -10
+  namespace: mongodb-system
+  helmUpgradeFlags:
+    - --create-namespace
+    - --wait
+    - --timeout
+    - 300s
+  values:
+    watchAllNamespaces: false
+    watchNamespace: "default"
+```
+
+The `weight: -10` ensures the operator installs before the database chart. The `--wait` flag ensures CRDs are registered before proceeding.
+
+Note: Ensure that `spec.values.watchNamespace` matches the namespace where you deploy the database chart. If you change the database namespace from `default`, update `watchNamespace` accordingly so the operator reconciles your CRs.
+
+### Database Chart
+
+```yaml
+apiVersion: kots.io/v1beta2
+kind: HelmChart
+metadata:
+  name: psmdb-database
+spec:
+  chart:
+    name: psmdb-db
+    chartVersion: 1.17.0
+    helmRepositories:
+      - name: percona
+        repository: https://percona.github.io/percona-helm-charts/
+  weight: 10
+  namespace: default
+  helmUpgradeFlags:
+    - --wait
+    - --timeout
+    - 600s
+  values:
+    crVersion: 1.17.0
+    replsets:
+      - name: rs0
+        size: repl{{ ConfigOption "mongodb_replica_count" }}
+        volumeSpec:
+          persistentVolumeClaim:
+            storageClassName: repl{{ ConfigOption "storage_class" }}
+            resources:
+              requests:
+                storage: repl{{ ConfigOption "mongodb_storage_size" }}
+        resources:
+          limits:
+            cpu: "2"
+            memory: "4G"
+          requests:
+            cpu: "500m"
+            memory: "1G"
+  optionalValues:
+    - when: 'repl{{ ConfigOptionEquals "enable_backups" "1" }}'
+      recursiveMerge: true
+      values:
+        backup:
+          enabled: true
+          storages:
+            s3-backup:
+              type: s3
+              s3:
+                bucket: my-backup-bucket
+                region: us-west-2
+                credentialsSecret: mongodb-s3-credentials
+          tasks:
+            - name: daily-backup
+              enabled: true
+              schedule: "0 2 * * *"
+              storageName: s3-backup
+              compressionType: gzip
+```
+
+The `weight: 10` ensures this installs after the operator. The extended timeout (600s) allows time for database pods to initialize. Config values from the KOTS Config section are passed to the Helm chart using template functions.
+
+## KOTS Config Options
+
+Configure MongoDB settings via KOTS Config:
+
+```yaml
+apiVersion: kots.io/v1beta1
+kind: Config
+metadata:
+  name: mongodb-config
+spec:
+  groups:
+    - name: mongodb_settings
+      title: MongoDB Configuration
+      items:
+        - name: mongodb_replica_count
+          title: Replica Set Size
+          type: text
+          default: "3"
+
+        - name: mongodb_storage_size
+          title: Storage Size Per Replica
+          type: text
+          default: "20Gi"
+
+        - name: storage_class
+          title: Storage Class
+          type: text
+          default: "standard"
+
+        - name: enable_backups
+          title: Enable Automated Backups
+          type: bool
+          default: "0"
+```
+
+## Connection Secrets
+
+The Percona MongoDB Operator automatically provisions Kubernetes secrets for database access:
+
+### User Secrets
+
+The operator creates a Kubernetes secret containing connection credentials for applications:
+- Database admin credentials
+- User credentials
+- System user accounts
+
+**For Helm deployments**, the secret name follows the pattern: `<release-name>-psmdb-db-secrets`
+
+For example, if you install the `psmdb-db` chart with release name `my-mongodb`, the secret will be named `my-mongodb-psmdb-db-secrets`.
+
+### Internal Secrets
+
+The operator creates two key secret types:
+- **Application credentials secret**: `<release-name>-psmdb-db-secrets` (primary secret your apps should consume)
+- **Internal operator secret**: `internal-<release-name>-psmdb-db-users` (used by the operator; do not modify)
+
+The internal secret mirrors the application secret and is used exclusively by the operator for internal operations.
+
+**Documentation:**
+- [Application and System Users](https://docs.percona.com/percona-operator-for-mongodb/users.html)
+- [Connect to MongoDB](https://docs.percona.com/percona-operator-for-mongodb/connect.html)
+
+### Accessing Connection Credentials
+
+The application credentials secret contains keys for various system users. Key fields include:
+
+- `MONGODB_DATABASE_ADMIN_USER` - Admin username (default: `databaseAdmin`)
+- `MONGODB_DATABASE_ADMIN_PASSWORD` - Admin password
+- Additional user credentials for backup, monitoring, and cluster operations
+
+**Retrieving credentials:**
+
+```bash
+# Get the admin username
+kubectl get secret <release-name>-psmdb-db-secrets -n default \
+  -o jsonpath='{.data.MONGODB_DATABASE_ADMIN_USER}' | base64 -d
+
+# Get the admin password
+kubectl get secret <release-name>-psmdb-db-secrets -n default \
+  -o jsonpath='{.data.MONGODB_DATABASE_ADMIN_PASSWORD}' | base64 -d
+```
+
+**Connection string format for replica sets:**
+
+```
+mongodb://<username>:<password>@<release-name>-rs0.<namespace>.svc.cluster.local/admin?replicaSet=rs0&ssl=false
+```
+
+**Using credentials in application deployments:**
+
+```yaml
+apiVersion: v1
+kind: Pod
+metadata:
+  name: mongodb-client
+spec:
+  containers:
+  - name: mongodb-client
+    image: mongo:6.0
+    env:
+    - name: MONGODB_USER
+      valueFrom:
+        secretKeyRef:
+          name: <release-name>-psmdb-db-secrets
+          key: MONGODB_DATABASE_ADMIN_USER
+    - name: MONGODB_PASSWORD
+      valueFrom:
+        secretKeyRef:
+          name: <release-name>-psmdb-db-secrets
+          key: MONGODB_DATABASE_ADMIN_PASSWORD
+```
+
+See the [Percona connection documentation](https://docs.percona.com/percona-operator-for-mongodb/connect.html) for complete details on available secret keys and connection methods.
+
+## Upgrading
+
+- Keep `spec.chart.chartVersion` for `psmdb-operator` and the `crVersion` in the database chart values in lockstep (e.g., both `1.17.0`).
+- Upgrade order matters due to CRDs and controller changes: apply operator upgrade first (lower weight), then the database chart (higher weight).
+- Re-verify that `watchNamespace` is correct after namespace changes, and allow additional time for reconciliation during major upgrades.
+
+## Additional Resources
+
+- [Replicated HelmChart Reference](https://docs.replicated.com/reference/custom-resource-helmchart-v2)
+- [Orchestrating Resource Deployment](https://docs.replicated.com/vendor/orchestrating-resource-deployment)
+- [Percona MongoDB Operator Documentation](https://docs.percona.com/percona-operator-for-mongodb/)
+- [Helm Hooks Documentation](https://helm.sh/docs/topics/charts_hooks/)