Enhanced Failover

LB + Health Checking

Easily integrate health checks into your load balancing configurations, with baked in Failover. Failover automatically moves your traffic from unavailable resources to healthy ones.

The "most affordable" and "easiest to configure" kind of load balancing.

DNS Failover is natively integrated with almost all of our services:

  • GeoProximity
  • Global Load Balancing
  • Traffic Steering
  • Round Robin
  • Latency Load Balancing

Failover is supported for A, AAAA, ANAME, and CNAME records.

All you need to do is enable Failover for your record, and specify the IP addresses or hostnames of your "backup" resources. These backups are only used when the primary IP/hostname is unavailable.

View Tutorial
Round robin

What Our Customers Say:

"For critical web applications, you need to have an independent system that is capable of monitoring your primary infrastructure, detecting failure, and switching to an independent secondary system. "

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Types of DNS Failover

There are three setting for enhanced failover. Rankings determine the order the backup IP addresses will be served when the primary IP in unavailable.

Ranking Mode Description How It Works
Normal Always lowest levels Attempt to keep the IP address to the most preferred system in the list.
Off On Any Failover Move to an active IP Turn off failover after any failover.
One Way Move to higher levels Only failover your domains to IPs that are further down the list. For example, IP #1 will failover to #2, and #2 will failover to #3, but it will never go back to #1 unless manually changed.

Round Robin

Multi-Value LB

The most basic of load balancing services is called round robin. Round robin is often compared to a rotor because it returns one endpoint at a time in a cyclical manner.

Let’s say you want to point your domain to three geographically distributed web servers: , , and with round robin enabled. Each time your domain is queried, it will return the next IP in the list.

View Tutorial
Round robin
Weighted Round robin

Weighted Round Robin

Multi-Value + Weights

The second kind of load balancing is called weighted round robin and allows you to distribute uneven amounts of traffic across your endpoints. This is great way to prioritize servers and resources in your network that have more capacity. You can also use weights to slowly roll out an update to only segments of your users at a time.

Record Pools

In Constellix, you need to configure weighted round robin using record pools. Pools are groups of endpoints, which are applied to DNS records. When the record is queried, it will rotate through the different endpoints in the pool at each request. We like to think of round robin pools as rotors.

There are many ways to customize record pools. For instance, you can choose how many endpoints are returned each time the record is queried.

View Tutorial

Round Robin with Failover

Multi-Value + Health Checks

You can integrate monitoring checks with your round robin/multi-value configurations. That way, only healthy endpoints are served to users. If an endpoint is detected as down, it will be removed from the rotation. But if it comes back as healthy, it will be included in the next cycle.

View Tutorial

You can also use Round Robin with Failover if you want just one endpoint to be returned unless it is down. If it does come back as down, then we will failover the other endpoints which will be returned in a round robin fashion.

In this case, you would create two pools, one with just your primary endpoint. The second pool would contain the endpoints you want to failover to.

Round robin with failover
Round robin

Performance-based LB

Latency Routing (ITO)

ITO, Internet Traffic Optimization, uses integrated monitoring checks, just like Round Robin with Failover, but it can also account for the round trip time (RTT) of the systems in your load balancing configuration.

Enable ITO in your load balancing pools and traffic will only be sent to the fastest responding resource(s). You can choose to return one or multiple resources in an ITO pool.

Latency load balancing is ideal for multi-vendor configurations like multi-CDN, multi-DDoS, or multi-cloud.

Keep in mind... Latency load balancing is configured by region, so you want to have multiple resources in whichever region you are using this feature.

GeoDNS + Load Balancing

Regional LB

All of our load balancing services can be configured regionally. That means, the load balancing policy will only be used when a user from a specified region makes a query for that record.

Regional load balancing can be used to build your own region-specific CDN (Content Delivery Network), create custom routing rules for a single region, and so much more.

Can't Get Enough?

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Stay Online During the Apocalypse

Dig into the many different kinds of load balancing, how they differ from other traffic managers like failover and round robin

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Intro to Geo Load Balancing

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