VNet-VNet example

VNet-VNet connections use VPN gateways to send encrypted traffic between Azure virtual networks. Advantages include:

• Cluster domain name is directly accessible without a NAT.
• VNets from different subscriptions don't need to be associated with the same Active Directory tenant.

Cons include:

• Bandwidth is limited. See the virtual network gateway planning table.
• Configuration is complicated.
• There's an associated cost. See the virtual network gateway planning table.

Example

This example shows how to connect using VNet-VNet connections.

To use this method, you need to create Azure VPN gateways in each connected virtual network.

Assume that your cluster is on a subscription called development and is being accessed from a Linux client VM on another subscription called test. It has the following properties:

• Cluster:
  • Subscription: development
  • Cluster ID: p-mckwlbakq5
  • Account ID: brcxzr08qr7rbei1
  • Organization's domain name: biganimal.io

• Linux client VM called vm-client:
  • Subscription: test
  • Resource group: rg-client
  • Virtual network: vnet-client
  • Virtual network subnet: snet-client

Prerequisites

To walk through an example in your own environment, you need:

• Your cluster URL. You can find the URL in the Connect tab of your cluster instance in the BigAnimal portal.

• The IP address of your cluster. You can find the IP address of your cluster using the following command:

  → WrapCopy

  dig +short p-mckwlbakq5.brcxzr08qr7rbei1.biganimal.io

  Output

  10.240.1.218

• A Postgresql client, such as psql, installed on your client VM.

Step 1: Create a VPN gateway for the cluster's virtual network

1. In the Azure portal, search for Virtual network gateways. Locate Virtual network gateways in the search results and select it.

2. On the Virtual network gateways page, select + Create.

3. On the Create virtual network gateway page, create the VPN gateway for the cluster's resource virtual network vnet-japaneast. Name the VPN gateway vpng-biganimal.

   

Step 2: Create a VPN gateway for the client VM virtual network

In the same way, create the gateway for your client VM virtual network vnet-client. Name the client VPN gateway vpng-client.

Step 3: Add a gateway connection between the two VPN gateways

Use the Azure CLI or PowerShell to add a VPN gateway connection from vpng-biganimal:

1. Get the VPN gateway ID of vpng-client.

   From the BigAnimal subscription:

   → WrapCopy

   az network vnet-gateway show -n vpng-biganimal -g brCxzr08qr7RBEi1-rg-japaneast-management --query "[id]" -otsv

   Output

   subscriptions/.../vpng-biganimal

   From the client VM's subscription:

   → WrapCopy

   az network vnet-gateway show -n vpng-client -g rg-client --query "[id]" -o tsv

   Output

   /subscriptions/.../vpng-client

2. From the BigAnimal subscription, create a connection from vpng-biganimal to vpng-client:

   → WrapCopy

   az network vpn-connection create \
       -n vpnc-biganimal-client \
       -g brCxzr08qr7RBEi1-rg-japaneast-management \
       --vnet-gateway1 /subscriptions/.../vpng-biganimal \
       -l japaneast 
       --shared-key "a_very_long_and_complex_psk" \
       --vnet-gateway2 /subscriptions/.../vpng-client
   

   Note the value for --shared-key. It is a PSK for pairing authentication from both sides needed in the next step.

3. From the client VM's subscription, create another connection from vpng-client to vpng-ebdcloud:

   → WrapCopy

   az network vpn-connection create \
       -n vpnc-client-biganimal \
       -g rg-client \
       --vnet-gateway1 /subscriptions/.../vpng-client \
       -l japaneast \
       --shared-key "a_very_long_and_complex_psk!" \
       --vnet-gateway2 /subscriptions/.../vpng-biganimal

Step 4: Verify the connection

1. After a few minutes, verify the gateway connection status from either virtual networks with the following command:

   → WrapCopy

   az network vpn-connection show --name vpnc-client-biganimal -g rg-client \
       --query "[connectionStatus]" -o tsv

   Output

   Connected

2. Verify the connectivity to the cluster:

   → WrapCopy

   dig +short p-mckwlbakq5.brcxzr08qr7rbei1.biganimal.io 
   psql -h p-mckwlbakq5.brcxzr08qr7rbei1.biganimal.io -U edb_admin

   Output

   10.240.1.123 
   Password for user edb_admin: 
   
   psql (13.4 (Ubuntu 13.4-1.pgdg28.84+1), server 13.4.8 (Debian 13.4.8-1+deb10)) 
   WARNING : psql major version 13, server major version 13. Some psql features might not work. 
   SSL connection (protocol : TLSV1.3cipherTLS_AES_256_GCM_SHA384, bits : 256, compression : off) Type "help" for help. 
   
   edb_admin=>
   

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