# Deploy Coder on Azure with an Application Gateway

In certain enterprise environments, the [Azure Application Gateway](https://learn.microsoft.com/en-us/azure/application-gateway/ingress-controller-overview) is required.

These steps serve as a proof-of-concept example so that you can get Coder running with Kubernetes on Azure. Your deployment might require a separate Postgres server or signed certificates.

The Application Gateway supports:

* Websocket traffic (required for workspace connections)
* TLS termination

Refer to Microsoft's documentation on how to [enable application gateway ingress controller add-on for an existing AKS cluster with an existing application gateway](https://learn.microsoft.com/en-us/azure/application-gateway/tutorial-ingress-controller-add-on-existing).
The steps here follow the Microsoft tutorial for a Coder deployment.

## Deploy Coder on Azure with an Application Gateway [#deploy-coder-on-azure-with-an-application-gateway]

1. Create Azure resource group:

   ```sql
   az group create --name myResourceGroup --location eastus
   ```

2. Create AKS cluster:

   ```sql
   az aks create --name myCluster --resource-group myResourceGroup --network-plugin azure --enable-managed-identity --generate-ssh-keys
   ```

3. Create public IP:

   ```sql
   az network public-ip create --name myPublicIp --resource-group myResourceGroup --allocation-method Static --sku Standard
   ```

4. Create VNet and subnet:

   ```sql
   az network vnet create --name myVnet --resource-group myResourceGroup --address-prefix 10.0.0.0/16 --subnet-name mySubnet --subnet-prefix 10.0.0.0/24
   ```

5. Create Azure application gateway, attach VNet, subnet and public IP:

   ```sql
   az network application-gateway create --name myApplicationGateway --resource-group myResourceGroup --sku Standard_v2 --public-ip-address myPublicIp --vnet-name myVnet --subnet mySubnet --priority 100
   ```

6. Get app gateway ID:

   ```sql
   appgwId=$(az network application-gateway show --name myApplicationGateway --resource-group myResourceGroup -o tsv --query "id")
   ```

7. Enable app gateway ingress to AKS cluster:

   ```sql
   az aks enable-addons --name myCluster --resource-group myResourceGroup --addon ingress-appgw --appgw-id $appgwId
   ```

8. Get AKS node resource group:

   ```sql
   nodeResourceGroup=$(az aks show --name myCluster --resource-group myResourceGroup -o tsv --query "nodeResourceGroup")
   ```

9. Get AKS VNet name:

   ```sql
   aksVnetName=$(az network vnet list --resource-group $nodeResourceGroup -o tsv --query "[0].name")
   ```

10. Get AKS VNet ID:

    ```sql
    aksVnetId=$(az network vnet show --name $aksVnetName --resource-group $nodeResourceGroup -o tsv --query "id")
    ```

11. Peer VNet to AKS VNet:

    ```sql
    az network vnet peering create --name AppGWtoAKSVnetPeering --resource-group myResourceGroup --vnet-name myVnet --remote-vnet $aksVnetId --allow-vnet-access
    ```

12. Get app gateway VNet ID:

    ```sql
    appGWVnetId=$(az network vnet show --name myVnet --resource-group myResourceGroup -o tsv --query "id")
    ```

13. Peer AKS VNet to app gateway VNet:

    ```sql
    az network vnet peering create --name AKStoAppGWVnetPeering --resource-group $nodeResourceGroup --vnet-name $aksVnetName --remote-vnet $appGWVnetId --allow-vnet-access
    ```

14. Get AKS credentials:

    ```sql
    az aks get-credentials --name myCluster --resource-group myResourceGroup
    ```

15. Create Coder namespace:

    ```sh
    kubectl create ns coder
    ```

16. Deploy non-production PostgreSQL instance to AKS cluster:

    ```sh
    helm repo add bitnami https://charts.bitnami.com/bitnami
    helm install coder-db bitnami/postgresql \
    --set image.repository=bitnamilegacy/postgresql \
    --namespace coder \
    --set auth.username=coder \
    --set auth.password=coder \
    --set auth.database=coder \
    --set persistence.size=10Gi
    ```

17. Create the PostgreSQL secret:

    ```sh
    kubectl create secret generic coder-db-url -n coder --from-literal=url="postgres://coder:coder@coder-db-postgresql.coder.svc.cluster.local:5432/coder?sslmode=disable"
    ```

18. Deploy Coder to AKS cluster:

    ```sh
    helm repo add coder-v2 https://helm.coder.com/v2
    helm install coder coder-v2/coder \
        --namespace coder \
     --values values.yaml \
     --version 2.25.2
    ```

19. Clean up Azure resources:

    ```sql
    az group delete --name myResourceGroup
    az group delete --name MC_myResourceGroup_myCluster_eastus
    ```

20. Deploy the gateway - this needs clarification

21. After you deploy the gateway, add the following entries to Helm's `values.yaml` file before you deploy Coder:

    ```yaml
      service:
        enable: true
        type: ClusterIP
        sessionAffinity: None
        externalTrafficPolicy: Cluster
        loadBalancerIP: ""
        annotations: {}
        httpNodePort: ""
        httpsNodePort: ""

      ingress:
        enable: true
        className: "azure-application-gateway"
        host: ""
        wildcardHost: ""
        annotations: {}
        tls:
          enable: false
          secretName: ""
          wildcardSecretName: ""
    ```