One of the most common load balancing techniques is a Round Robin configuration that utilizes DNS record pools. This tutorial will explain how to create pools for A records, which are used to balance traffic across multiple IPv4 addresses. Traffic can be distributed evenly (standard Round Robin) or based on the performance or capacity of the systems in the pool (Weighted Round Robin).
If you want to distribute traffic across multiple servers using a regular or Weighted Round Robin configuration, you can add multiple IPv4 addresses to a pool and then apply them to the same record.
You can also create a failover record pool using A records. This technique works similarly to Round Robin except that with a failover pool, your traffic will only be sent to healthy resources in the pool. For instance, if you have your A record pointed to three different IPs, and one of them is unavailable, the downed IP will not be returned.
To learn more about load balancing, use cases, and to view video tutorials visit our DNS Load Balancing page.
A. Name: Give your pool configuration an identifiable name.
B. Num Return: Specify the number of IPs you want to have returned in the pool.
C. Min Available: Enter the minimum number of IPs that must be available in the pool.
D. Enable ITO: For more information on ITO, click here.
E. Contact Notify: This option allows you to select a contact list to send notifications to. For help setting up a contact list, go here.
F. IP: Enter the IPv4 address you are pointing to.
G. Weight: You can distribute weight equally between IPs in a pool, or choose a different weight for each IP, depending on how you want to optimize your traffic. A higher weight will send more traffic to that IP. See our Weighted Round Robin tutorial to learn more.
H. Sonar Check: If you set Policy (see step I. below) to "Follow Sonar" or "Off on Failure," click in the “Sonar Check” field and select the desired Sonar Check from the drop-down text box.
For "Always On" or "Always Off,” skip this step.
I. Policy: There are four policies:
J. Add Another IP: You will need to click this option for each additional IP you want to add to the record pool.
Once you have entered all the necessary values for your record pool, click the green Save button at the bottom left of the pop-up window to store the pool.
4. Apply Pool to Domain
Be sure to apply the pool(s) to your domain for your record pool configurations to take effect. If you need help with this step, view this tutorial.
For more information on our services and features, click here.