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Author: nhathoang989

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+# Deploying with OpenTofu
+
+OpenTofu is an open-source infrastructure as code tool that allows you to define and provision infrastructure across multiple cloud providers. This guide will help you deploy Mixcore using OpenTofu.
+
+## Prerequisites
+
+- [OpenTofu](https://opentofu.org/docs/intro/install/) installed
+- Cloud provider CLI tools installed:
+  - [AWS CLI](https://aws.amazon.com/cli/) for AWS
+  - [Azure CLI](https://docs.microsoft.com/en-us/cli/azure/install-azure-cli) for Azure
+  - [gcloud CLI](https://cloud.google.com/sdk/docs/install) for GCP
+- [kubectl](https://kubernetes.io/docs/tasks/tools/) installed
+- [Helm](https://helm.sh/docs/intro/install/) installed
+
+## Configuration
+
+### Cloud Provider Setup
+
+#### AWS
+```sh
+# Configure AWS credentials
+export AWS_ACCESS_KEY_ID=your_access_key
+export AWS_SECRET_ACCESS_KEY=your_secret_key
+```
+
+#### Azure
+```sh
+# Login to Azure
+az login
+
+# Set environment variables
+export ARM_SUBSCRIPTION_ID=your_subscription_id
+export ARM_TENANT_ID=your_tenant_id
+export ARM_CLIENT_ID=your_client_id
+export ARM_CLIENT_SECRET=your_client_secret
+```
+
+#### GCP
+```sh
+# Login to GCP
+gcloud auth login
+gcloud auth application-default login
+
+# Set project
+export GOOGLE_PROJECT=your_project_id
+```
+
+### OpenTofu Configuration
+
+1. Create a `terraform.tfvars` file:
+```hcl
+cloud_provider = "aws"  # or "azure" or "gcp"
+cluster_name = "mixcore-cluster"
+sqlserver_password = "your_password"
+mysql_password = "your_password"
+redis_password = "your_password"
+```
+
+2. Review and customize `values.yaml` for Helm configuration:
+```yaml
+# See cloud/opentofu/values.yaml for configuration options
+```
+
+## Deployment
+
+1. Initialize OpenTofu:
+```sh
+cd cloud/opentofu
+tofu init
+```
+
+2. Plan the deployment:
+```sh
+tofu plan
+```
+
+3. Apply the deployment:
+```sh
+tofu apply
+```
+
+## Accessing the Application
+
+1. Get the cluster endpoint:
+```sh
+tofu output cluster_endpoint
+```
+
+2. Get the kubeconfig:
+```sh
+tofu output kubeconfig > kubeconfig.yaml
+export KUBECONFIG=kubeconfig.yaml
+```
+
+3. Access services:
+- Main application: http://<load-balancer-ip>
+- SQL Server: <load-balancer-ip>:1433
+- MySQL: <load-balancer-ip>:3306
+- Redis: <load-balancer-ip>:6379
+
+## Updating Configuration
+
+1. Edit `values.yaml` for Helm configuration:
+```sh
+nano cloud/opentofu/values.yaml
+```
+
+2. Apply changes:
+```sh
+tofu apply
+```
+
+## Destroying Resources
+
+To destroy all resources:
+```sh
+tofu destroy
+```
+
+## CI/CD Integration
+
+### GitHub Actions
+```yaml
+deploy-infra:
+  needs: build-and-push
+  runs-on: ubuntu-latest
+  steps:
+    - uses: actions/checkout@v3
+    
+    - name: Setup OpenTofu
+      uses: hashicorp/setup-terraform@v2
+      with:
+        terraform_version: "1.5.0"
+        
+    - name: Deploy Infrastructure
+      run: |
+        cd cloud/opentofu
+        tofu init
+        tofu apply -auto-approve
+```
+
+### GitLab CI/CD
+```yaml
+deploy-infra:
+  stage: deploy
+  image:
+    name: hashicorp/terraform:light
+    entrypoint: [""]
+  script:
+    - cd cloud/opentofu
+    - terraform init
+    - terraform apply -auto-approve
+  only:
+    - main
+```
+
+## Troubleshooting
+
+### Common Issues
+
+1. **Authentication Errors**
+   - Verify cloud provider credentials
+   - Check environment variables
+   - Ensure CLI tools are properly configured
+
+2. **Resource Creation Failures**
+   - Check resource quotas
+   - Verify network configurations
+   - Review cloud provider logs
+
+3. **Kubernetes Connection Issues**
+   - Verify kubeconfig
+   - Check cluster status
+   - Ensure proper RBAC permissions
+
+### Logs and Monitoring
+
+1. **OpenTofu Logs**
+```sh
+# Enable debug logging
+export TF_LOG=DEBUG
+tofu apply
+```
+
+2. **Kubernetes Logs**
+```sh
+# View pod logs
+kubectl logs -f deployment/mixcore -n mixcore
+
+# View resource usage
+kubectl top pods -n mixcore
+```
+
+## Best Practices
+
+1. **State Management**
+   - Use remote state storage
+   - Enable state locking
+   - Regular state backups
+
+2. **Security**
+   - Use secrets management
+   - Implement least privilege
+   - Regular security audits
+
+3. **Maintenance**
+   - Regular updates
+   - Backup procedures
+   - Disaster recovery planning
+
+## Additional Resources
+
+- [OpenTofu Documentation](https://opentofu.org/docs)
+- [Kubernetes Documentation](https://kubernetes.io/docs)
+- [Helm Documentation](https://helm.sh/docs)
+- [Cloud Provider Documentation](https://docs.aws.amazon.com/index.html)