ARO Quickstart - Private Cluster with JumpHost

A Quickstart guide to deploying a Private Azure RedHat OpenShift cluster.

Once the cluster is running you will need a way to access the private network that ARO is deployed into.

Author: Paul Czarkowski

Prerequisites

Azure CLI

Obviously you’ll need to have an Azure account to configure the CLI against.

MacOS

See Azure Docs for alternative install options.

1. Install Azure CLI using homebrew

    brew update && brew install azure-cli
   

Linux

See Azure Docs for alternative install options.

1. Import the Microsoft Keys

    sudo rpm --import https://packages.microsoft.com/keys/microsoft.asc
   

2. Add the Microsoft Yum Repository

    cat << EOF | sudo tee /etc/yum.repos.d/azure-cli.repo
    [azure-cli]
    name=Azure CLI
    baseurl=https://packages.microsoft.com/yumrepos/azure-cli
    enabled=1
    gpgcheck=1
    gpgkey=https://packages.microsoft.com/keys/microsoft.asc
    EOF
   

3. Install Azure CLI

    sudo dnf install -y azure-cli
   

Prepare Azure Account for Azure OpenShift

1. Log into the Azure CLI by running the following and then authorizing through your Web Browser

    az login
   

2. Make sure you have enough Quota (change the location if you’re not using East US)

    az vm list-usage --location "East US" -o table
   

   see Addendum - Adding Quota to ARO account if you have less than 36 Quota left for Total Regional vCPUs.

3. Register resource providers

    az provider register -n Microsoft.RedHatOpenShift --wait
    az provider register -n Microsoft.Compute --wait
    az provider register -n Microsoft.Storage --wait
    az provider register -n Microsoft.Authorization --wait
   

Get Red Hat pull secret

1. Log into cloud.redhat.com

2. Browse to https://cloud.redhat.com/openshift/install/azure/aro-provisioned

3. click the Download pull secret button and remember where you saved it, you’ll reference it later.

Deploy Azure OpenShift

Variables and Resource Group

Set some environment variables to use later, and create an Azure Resource Group.

1. Set the following environment variables

   Change the values to suit your environment, but these defaults should work.

    AZR_RESOURCE_LOCATION=eastus
    AZR_RESOURCE_GROUP=openshift-private
    AZR_CLUSTER=private-cluster
    AZR_PULL_SECRET=~/Downloads/pull-secret.txt
    NETWORK_SUBNET=10.0.0.0/20
    CONTROL_SUBNET=10.0.0.0/24
    MACHINE_SUBNET=10.0.1.0/24
    FIREWALL_SUBNET=10.0.2.0/24
    JUMPHOST_SUBNET=10.0.3.0/24
   

2. Create an Azure resource group

    az group create \
      --name $AZR_RESOURCE_GROUP \
      --location $AZR_RESOURCE_LOCATION
   

Networking

Create a virtual network with two empty subnets

1. Create virtual network

    az network vnet create \
      --address-prefixes $NETWORK_SUBNET \
      --name "$AZR_CLUSTER-aro-vnet-$AZR_RESOURCE_LOCATION" \
      --resource-group $AZR_RESOURCE_GROUP
   

2. Create control plane subnet

    az network vnet subnet create \
      --resource-group $AZR_RESOURCE_GROUP \
      --vnet-name "$AZR_CLUSTER-aro-vnet-$AZR_RESOURCE_LOCATION" \
      --name "$AZR_CLUSTER-aro-control-subnet-$AZR_RESOURCE_LOCATION" \
      --address-prefixes $CONTROL_SUBNET \
      --service-endpoints Microsoft.ContainerRegistry
   

3. Create machine subnet

    az network vnet subnet create \
      --resource-group $AZR_RESOURCE_GROUP \
      --vnet-name "$AZR_CLUSTER-aro-vnet-$AZR_RESOURCE_LOCATION" \
      --name "$AZR_CLUSTER-aro-machine-subnet-$AZR_RESOURCE_LOCATION" \
      --address-prefixes $MACHINE_SUBNET \
      --service-endpoints Microsoft.ContainerRegistry
   

4. Disable network policies on the control plane subnet

   This is required for the service to be able to connect to and manage the cluster.

    az network vnet subnet update \
      --name "$AZR_CLUSTER-aro-control-subnet-$AZR_RESOURCE_LOCATION" \
      --resource-group $AZR_RESOURCE_GROUP \
      --vnet-name "$AZR_CLUSTER-aro-vnet-$AZR_RESOURCE_LOCATION" \
      --disable-private-link-service-network-policies true
   

Firewall + Internet Egress

This replaces the routes for the cluster to go through the Firewall for egress vs the Loadbalancer which we can later remove. It does come with extra Azure costs of course.

You can skip this step if you don’t need to restrict egress.

1. Make sure you have the AZ CLI firewall extensions

    az extension add -n azure-firewall
    az extension update -n azure-firewall
   

2. Create a firewall network, IP, and firewall

    az network vnet subnet create \
        -g $AZR_RESOURCE_GROUP \
        --vnet-name "$AZR_CLUSTER-aro-vnet-$AZR_RESOURCE_LOCATION" \
        -n "AzureFirewallSubnet" \
        --address-prefixes $FIREWALL_SUBNET
   
    az network public-ip create -g $AZR_RESOURCE_GROUP -n fw-ip \
      --sku "Standard" --location $AZR_RESOURCE_LOCATION
   
    az network firewall create -g $AZR_RESOURCE_GROUP \
      -n aro-private -l $AZR_RESOURCE_LOCATION
   

3. Configure the firewall

this may take 15 minutes

```bash
az network firewall ip-config create -g $AZR_RESOURCE_GROUP \
  -f aro-private -n fw-config --public-ip-address fw-ip \
  --vnet-name "$AZR_CLUSTER-aro-vnet-$AZR_RESOURCE_LOCATION"

FWPUBLIC_IP=$(az network public-ip show -g $AZR_RESOURCE_GROUP -n fw-ip --query "ipAddress" -o tsv)
FWPRIVATE_IP=$(az network firewall show -g $AZR_RESOURCE_GROUP -n aro-private --query "ipConfigurations[0].privateIpAddress" -o tsv)

echo $FWPUBLIC_IP
echo $FWPRIVATE_IP
```

1. Create and configure a route table

    az network route-table create -g $AZR_RESOURCE_GROUP --name aro-udr
   
    az network route-table route create -g $AZR_RESOURCE_GROUP --name aro-udr --route-table-name aro-udr --address-prefix 0.0.0.0/0 --next-hop-type VirtualAppliance --next-hop-ip-address $FWPRIVATE_IP
   

2. Create application rules for ARO resources

    az network firewall application-rule create -g $AZR_RESOURCE_GROUP -f aro-private \
      --collection-name 'ARO' \
      --action allow \
      --priority 100 \
      -n 'required' \
      --source-addresses '*' \
      --protocols 'http=80' 'https=443' \
      --target-fqdns 'registry.redhat.io' '*.quay.io' 'sso.redhat.com' 'management.azure.com' 'mirror.openshift.com' 'api.openshift.com' 'quay.io' '*.blob.core.windows.net' 'gcs.prod.monitoring.core.windows.net' 'registry.access.redhat.com' 'login.microsoftonline.com' '*.servicebus.windows.net' '*.table.core.windows.net' 'grafana.com'
   

3. Create application rules for dockerhub

    az network firewall application-rule create -g $AZR_RESOURCE_GROUP -f aro-private \
    --collection-name 'Docker' \
    --action allow \
    --priority 200 \
    -n 'docker' \
    --source-addresses '*' \
    --protocols 'http=80' 'https=443' \
    --target-fqdns '*cloudflare.docker.com' '*registry-1.docker.io' 'apt.dockerproject.org' 'auth.docker.io'
   

4. Update the subnets to use the Firewall

    az network vnet subnet update -g $AZR_RESOURCE_GROUP \
      --vnet-name $AZR_CLUSTER-aro-vnet-$AZR_RESOURCE_LOCATION \
      --name "$AZR_CLUSTER-aro-control-subnet-$AZR_RESOURCE_LOCATION" \
      --route-table aro-udr
   
    az network vnet subnet update -g $AZR_RESOURCE_GROUP \
      --vnet-name $AZR_CLUSTER-aro-vnet-$AZR_RESOURCE_LOCATION \
      --name "$AZR_CLUSTER-aro-machine-subnet-$AZR_RESOURCE_LOCATION" \
      --route-table aro-udr
   

The cluster itself

1. Create the cluster

   This will take between 30 and 45 minutes.

    az aro create \
      --resource-group $AZR_RESOURCE_GROUP \
      --name $AZR_CLUSTER \
      --vnet "$AZR_CLUSTER-aro-vnet-$AZR_RESOURCE_LOCATION" \
      --master-subnet "$AZR_CLUSTER-aro-control-subnet-$AZR_RESOURCE_LOCATION" \
      --worker-subnet "$AZR_CLUSTER-aro-machine-subnet-$AZR_RESOURCE_LOCATION" \
      --apiserver-visibility Private \
      --ingress-visibility Private \
      --pull-secret @$AZR_PULL_SECRET
   

Jump Host

With the cluster in a private network, we can create a Jump host in order to connect to it. You can do this while the cluster is being created.

1. Create jump subnet

    az network vnet subnet create \
      --resource-group $AZR_RESOURCE_GROUP \
      --vnet-name "$AZR_CLUSTER-aro-vnet-$AZR_RESOURCE_LOCATION" \
      --name JumpSubnet \
      --address-prefixes $JUMPHOST_SUBNET \
      --service-endpoints Microsoft.ContainerRegistry
   

2. Create a jump host

    az vm create --name jumphost \
        --resource-group $AZR_RESOURCE_GROUP \
        --ssh-key-values $HOME/.ssh/id_rsa.pub \
        --admin-username aro \
        --image "RedHat:RHEL:8.2:8.2.2021040911" \
        --subnet JumpSubnet \
        --public-ip-address jumphost-ip \
        --vnet-name "$AZR_CLUSTER-aro-vnet-$AZR_RESOURCE_LOCATION"
   

3. Save the jump host public IP address

   ```bash JUMP_IP=$(az vm list-ip-addresses -g $AZR_RESOURCE_GROUP -n jumphost -o tsv
   –query ‘[].virtualMachine.network.publicIpAddresses[0].ipAddress’) echo $JUMP_IP

4. ssh to jump host forwarding port 1337 as a socks proxy.

   replace the IP with the IP of the jump box from the previous step.

    ssh -D 1337 -C -i $HOME/.ssh/id_rsa aro@$JUMP_IP
   

5. test the socks proxy

    curl --socks5-hostname localhost:1337 http://www.google.com/
   

6. Install tools

    sudo yum install -y gcc libffi-devel python3-devel openssl-devel jq
   
    sudo rpm --import https://packages.microsoft.com/keys/microsoft.asc
    echo -e "[azure-cli]
    name=Azure CLI
    baseurl=https://packages.microsoft.com/yumrepos/azure-cli
    enabled=1
    gpgcheck=1
    gpgkey=https://packages.microsoft.com/keys/microsoft.asc" | sudo tee /etc/yum.repos.d/azure-cli.repo
    sudo dnf install -y microsoft-azure-cli
   
    wget https://mirror.openshift.com/pub/openshift-v4/clients/ocp/latest/openshift-client-linux.tar.gz
   
    mkdir openshift
    tar -zxvf openshift-client-linux.tar.gz -C openshift
    sudo install openshift/oc /usr/local/bin/oc
    sudo install openshift/kubectl /usr/local/bin/kubectl
   

7. Wait until the ARO cluster is fully provisioned.

8. Login to Azure

    az login
   

9. Get OpenShift console URL

   set these variables to match the ones you set at the start.

    AZR_RESOURCE_GROUP=openshift-private
    AZR_CLUSTER=private-cluster
   
    APISERVER=$(az aro show \
      --name $AZR_CLUSTER \
      --resource-group $AZR_RESOURCE_GROUP \
      -o tsv --query apiserverProfile.url)
    echo $APISERVER
   

10. Get OpenShift credentials

     ADMINPW=$(az aro list-credentials \
       --name $AZR_CLUSTER \
       --resource-group $AZR_RESOURCE_GROUP \
       --query kubeadminPassword \
       -o tsv)
    

Test Access

1. Test Access to the cluster via the socks proxy

Unfortunately you can’t [easily] use the socks proxy with the oc command, but at least you can access the console via the socks proxy.

    CONSOLE=$(az aro show \
      --name $AZR_CLUSTER \
      --resource-group $AZR_RESOURCE_GROUP \
      -o tsv --query consoleProfile)

    echo $CONSOLE

    curl --socks5-hostname localhost:1337 $CONSOLE

1. Set localhost:1337 as a socks proxy in your browser and verify you can access the cluster by browsing to the $CONSOLE url.

Delete Cluster

Once you’re done its a good idea to delete the cluster to ensure that you don’t get a surprise bill.

1. Delete the cluster

    az aro delete -y \
      --resource-group $AZR_RESOURCE_GROUP \
      --name $AZR_CLUSTER
   

2. Delete the Azure resource group

   Only do this if there’s nothing else in the resource group.

    az group delete -y \
      --name $AZR_RESOURCE_GROUP
   

Adendum

Adding Quota to ARO account

1. Create an Azure Support Request

2. Set Issue Type to “Service and subscription limits (quotas)”

3. Set Quota Type to “Compute-VM (cores-vCPUs) subscription limit increases”

4. Click Next Solutions »

5. Click Enter details

6. Set Deployment Model to “Resource Manager

7. Set Locations to “(US) East US”

8. Set Types to “Standard”

9. Under Standard check “DSv3” and “DSv4”

10. Set New vCPU Limit for each (example “60”)

11. Click Save and continue

12. Click Review + create »

13. Wait until quota is increased.