One of the most common load balancing techniques is Round Robin, which is used to balance traffic across multiple servers. While basic Round Robin is restricted to even distribution, Weighted Round Robin can be dispersed among servers unevenly. In Constellix, this is achieved using DNS record pools. In this tutorial, you will learn how to create a record pool with a Weighted Round Robin configuration. For example purposes, we will be using A record pools, but the steps apply to AAAA, CNAME, and ANAME record pools as well.
Weighted Round Robin is most used in DNS configurations when web traffic needs to be distributed across multiple servers based on capacity, performance, or cost. To learn more about load balancing, visit our DNS Load Balancing resource.
A. Name: Give your pool/Weighted Round Robin 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: ITO is a latency-based load balancer that accounts for round trip time (RTT) and is especially useful for multi-cloud environments. Visit our What is ITO Latency-based Load Balancing resource for more information.
E. Contact Notify: This option allows you to select a contact list to send notifications to. If you have not set up a contact list yet, visit our tutorial on How to Create a Contact List.
F. IP: Enter the IP address (or host) you are pointing to.
G. Weight: When using Weighted Round Robin, you can 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.
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.
Note: You can filter through the options by typing the associated IP or fully qualified domain name (FQDN) in the text field.
For "Always On" or "Always Off,” skip this step.
I. Policy: There are four policies:
J. Active: This column displays whether the IP is active or not being returned.
K. Speed: If using ITO, the connection speed will be shown here.
L. Status: This column represents the UP or DOWN status of IPs according to the associated Sonar health check.
M. Trash: Clicking the red trash can icon will permanently delete an IP from your record pool.
N. Add Another IP: You will need to click this option for each additional IP you want to add to the Weighted Round Robin record pool configuration.
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.
5. Apply Pool to Domain
Be sure to apply the pool(s) to your domain for your configuration to take effect. If you need help with this step, view this tutorial.
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