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+# CHT 4.x to 5.x Helm Charts Migration Guide
+
+## Overview
+
+This guide covers the migration of Kubernetes based CHT 4.x deployments using the [legacy Helm charts](https://github.com/medic/helm-charts) to the [new charts](https://github.com/medic/cht-core/tree/master/scripts/build/helm) introduced in CHT 5.x. The new Helm chart require updates to your `values.yaml` file. 
+
+Before starting be sure you have a `git clone` of the [CHT Core repository](https://github.com/medic/cht-core/) and that you have updated it with `git pull origin` to ensure you have the latest changes locally.  
+
+## Migration Steps
+
+{{% steps %}}
+
+### Step 1: Prepare Migration Values File
+
+1. Export the values from your existing 4.x deployment into the `migration-5x-values.yaml` file:
+   ```bash
+   helm get values <your-release-name> --namespace <your-namespace> > migration-5x-values.yaml
+   ```
+2. Be sure all booleans are unquoted by running these two `sed` commands which will correct them in the `migration-5x-values.yaml` file:
+ 
+   ```
+   sed -i 's/: "false"/: false/g' migration-5x-values.yaml
+   sed -i 's/: "true"/: true/g' migration-5x-values.yaml
+   ```
+
+
+3. Update the `migration-5x-values.yaml` file to be compliant with  5.x deployment requirements:
+
+   ```yaml
+   # Change field names - keep the same true/false value from your 4.x deployment
+   # Use true for multi-node deployments, false for single-node deployments
+   couchdb:
+     clusteredCouchEnabled: false  # was: clusteredCouch_enabled: false
+   
+   # For most migrations, use false. Use true for pre-created volumes for provisioning
+   couchdb_data:
+     preExistingDataAvailable: false  # Keep using dynamic storage provisioning  
+   
+   # Add required API service configuration
+   api:
+     service:
+       type: ClusterIP
+   
+   # Update image versions to 5.x
+   chtversion: 5.0.0
+   cht_image_tag: 5.0.0
+   ```
+
+4. Depending on the hosting environment, make a final edit to `migration-5x-values.yaml` file:
+   
+  {{< tabs items="GKE,EKS,K3s-K3d" >}}
+
+  {{< tab >}}
+  ```yaml
+  couchdb:
+    persistent_disk:
+      size: <size>  # Set appropriate size for your needs
+  ```
+  {{< /tab >}}
+
+  {{< tab >}}
+  ```yaml
+  ebs:
+    preExistingEBSVolumeSize: <size>  # Set appropriate size for your needs
+  ```
+  {{< /tab >}}
+
+  {{< tab >}}
+  ```yaml
+  couchdb:
+    storage_class: local-path  # was: "local-storage"
+  ```
+  {{< /tab >}}
+
+  {{< /tabs >}}
+
+### Step 2: Perform the Migration
+
+1. Upgrade the helm deployment form same directory as `migration-5x-values.yaml`.  As well, update `/path/to/cht-core` to be the location where CHT Core repo is checked out:
+   ```bash
+   helm upgrade <your-release-name> /path/to/cht-core/scripts/build/helm \
+     -f migration-5x-values.yaml \
+     --namespace <your-namespace>
+   ```
+
+2. **Monitor the upgrade**:
+   ```bash
+   helm status <your-release-name> --namespace <your-namespace>
+   kubectl get pods--namespace <your-namespace>
+   ```
+
+### Step 3: Verify Migration Success
+
+1. Check pod status:
+   ```bash
+   kubectl get pods -n <your-namespace>
+   ```
+
+2. Verify new 5.x components:
+   ```bash
+   # Look for the new couchdb-nouveau component
+   kubectl get pods --namespace <your-namespace> | grep nouveau
+   ```
+
+3. Test data integrity
+
+4. Test application access
+
+{{% /steps %}}
+
+## Best Practices
+
+1. **Test First**: Always test migrations in a non-production environment
+2. **Backup Data**: Ensure complete data backup before migration
+3. **Monitor Closely**: Watch deployment logs and metrics during migration
+4. **Document Changes**: Keep track of any custom configurations
+5. **Plan Downtime**: Schedule migrations during maintenance windows
+
+## Breaking Changes Reference
+
+| Change Type | Old (4.x) | New (5.x) | Platform | Impact |
+|-------------|-----------|-----------|----------|---------|
+| Field Rename | `clusteredCouch_enabled` | `couchdb.clusteredCouchEnabled` | All | Critical |
+| Field Rename | `local.diskPath` | `local_storage.preExistingDiskPath-1` | All | Critical |
+| New Field | - | `api.service.type: ClusterIP` | All | Critical |
+| Storage Config | Default sizes | `couchdb.couchdb_node_storage_size` required | All | Critical |
+| Storage Config | Default sizes | `couchdb.persistent_disk.size` required | GKE | Critical |
+| Storage Config | Default sizes | `ebs.preExistingEBSVolumeSize` required | EKS | Critical |
+| Storage Class | `local-storage` | `local-path` | K3s-K3d | Minor |
+| Structure | Flat config | Nested couchdb configuration | All | Medium |
+
+## Getting Help
+
+If you encounter issues during migration:
+
+1. Check the [CHT Documentation](https://docs.communityhealthtoolkit.org/)
+2. Review the [CHT Forum](https://forum.communityhealthtoolkit.org/)
+3. Open an issue in the [CHT Core Repository](https://github.com/medic/cht-core/issues)
+