Azure load balancers have external and internal load balancers, but for the purpose of this document, we will use an internal load balancer. The IP address of this internal load balancer is also used as a virtual IP address later, making it an access point for protected services.

  1. From Azure Home > Load balancers, select +Add and create a load balancer for this environment as shown in the following table.
Project Details
Subscription Your subscrition ID This is the subscription ID issued when subscribing to Azure services.
Resource group sios20rg
Instance details
Name sios20ilb
Region (Asia Pacific) Southeast Asia
Type Internal *Note 1
SKU Basic
Tier Regional
Configure virtual network
Virtual network sios20vnet
Subnet sios20sub1 (
IP address assignment Static
Private IP address *Note 2

*Note 1: Since this is an internal load balancer, you must select “Internal”.

*Note 2: This value is also used as a virtual IP address later, making it an access point for protected services.

  1. Click Review + Create, review the details and then click Create.

  1. Add the two virtual machines for the created cluster to the backend pool of the internal load balancer. Select Azure Home > Load balancers > Load balancer name > Backend pools > Add and configure the following:
Add Backend Pool
Name sios20backendpool
Backend Pool Configuration NIC
IP version IPv4
Associated to (Configure only when Basic is selected for SKU) Virtual machine
Target #1
Virtual machine sios20lknode01
IP address ipconfig1 ( *Note
Target #2
Virtual machine sios20lknode02
IP address ipconfig1 ( *Note

*Note: Link the backend pool with the primary (the first) network interface of the virtual machine you previously created.

  1. Click Add and verify that the backend pool has been created.

  1. Click Azure Home > Load balancers > Load balancer name > Health Probes > +Add and configure the following:
Health probe
Name sios20probe
Protocol TCP *Note
Port 12345 *Note
Interval 5
Unhealthy threshold 2

*Note: For health probes, specify the port used by the GenLB.

  1. Click Add and confirm that the probe has been created.

  1. Next, configure load balancing rules. From Azure Home > Load balancers > Load balancer name > Load balancing rules, click +Add and configure the following:
Add load balancing rule
Name sios20ilbrule
IP Version IPv4
Frontend IP address (LoadBalancerFrontEnd)
Protocol TCP
Port 1521 (Oracle)
5432 (PostgreSQL)
Backend port 1521 (Oracle)
5432 (PostgreSQL)
Backend pool sios20backendpool (2 virtual machines)
Health probe sios20probe (TCP:12345)
Session persistence None (default)
Idle timeout 4 (default)
Floating IP Enabled

*Note: Specify the port used by the application as the load balancing port.

  1. Click OK and verify that the load balancing rule has been created.

  1. Open Azure Home > Virtual machines and start the following three virtual machines and log in as lkadmin via RDP. If you are using a domain, add all three to the domain and log in as an administrator of the domain. (Steps to add VMs to the domain are not described in this document. Here we add the machines to the sios20.local domain and log in as SIOS20\lkadmin.)
  • sios20lknode01
  • sios20lknode02
  • sios20lkclient


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