what is the primary advantage to enabling round-robin dns?

Configure DNS Failover with Circular Robin

Modified on: Tue, 13 Jul, 2021 at 12:39 PM

What is circular-robin?
For an explanation of the round-robin configuration, delight visit our tutorial hither.

What is DNS Failover?
The DNS Failover service from DNS Made Easy is used to keep sites and web services online in the event of system or network issues. This is done by moving DNS traffic to another IP address that you accept running at another location. This service can as well be used to drift traffic between redundant internet connections. A DNS Failover configuration with a round-robin will split traffic evenly betwixt hosts unless 1 of the hosts is offline in which case information technology would exist removed from the circular-robin puddle.

Here is how the DNS Failover services piece of work:
DNS Failover services are configured on A records which bespeak to IP addresses. DNS Made Like shooting fish in a barrel's monitoring nodes check your main IP address on a two to 4-minute monitoring window. You can gear up upward the monitoring servers to check if your service is running on either TCP, UDP, HTTP, or HTTPS protocols, and on any port. Every bit soon equally your primary server fails to respond from at least 2 dissimilar geographic monitoring locations, your DNS is instantly updated on all DNS Made Easy name servers globally to point a secondary IP address equally long as it does reply on the same port and protocol configured. You can specify upwards to v IP addresses for each of your hostnames.

When would this exist used?
Round Robin with Failover is a very mutual setup for organizations that uses multiple data centers and wants traffic going to all of them. This configuration would ensure that y'all can have the traffic spread of Round Robin while likewise ensuring that if ane data center goes down, we will take it out of the rotation of IPs that would come up upward in a query. This would ensure no downtime for terminate-users.

one. Navigate to Managed DNS
At the pinnacle of the Control Panel, Click the DNS Menu and select Managed DNS from the drop-downwardly.

2. Select your Domain
 Select a domain from either the "Recently Updated Domains" box, or start typing the domain name in the textbox on the "Select Domain" tab.

3. Add round-robin A records (if they do not exist already)

• If an A record does not already exist for the desired name, then under A Records click the plus sign (+) to add a new A record.

• We will add a root record (an A tape with the name field left bare) to the domain example.com with an IP accost of 1.2.3.4 and a TTL of 180 seconds. If yous are adding DNS Failover to an existing A tape, and then you volition desire to edit the TTL of this record to set up it to a lower value. Records that utilise DNS Failover services should take a TTL betwixt 180-300 seconds. Click Submit

• Now, we will add together a second circular-robin A record with an IP address of 1.1.1.ane and a TTL of 180 seconds. At this point in the configuration, traffic to example.com is split up 50/50 between one.2.3.four and 1.i.ane.i. Click Submit

• Now we will set upwards a contact list for notification of the failover event. Select the Config carte, Click on Contact Lists

• Click on the plus sign (+) to add a new contact listing

• Give the contact listing an identifiable name and enter the email accost(es) you would like included in the list, one per line. Click SubmitAnnotation: Groups are discussed in a separate tutorial here, however, if you are the but user for your account your contact list should exist part of the Default grouping. Otherwise, information technology should be part of whatsoever group is set up to take management permissions for the domain.

5. Configure Failover

• At present we fix DNS Failover. IMPORTANT Annotation: The System Monitoring and DNS Failover options configured in this portion of the tutorial are examples only. Each configuration will differ based on monitoring requirements. Select the DNS Menu, select Managed DNS

• Select a domain from either the Recently Updated Domains box, or offset typing the domain proper noun in the textbox on the Select Domain tab

• Under the SM / FO column next to the A record, click off to edit the configuration.

• Enable System Monitoring and/or DNS Failover by checking the boxes. These tin be used independently of ane some other if yous wish.

A. Provide a System Description – this will be included in the notification you receive so you know which system the notification is for.

B. Select your contact list to be notified of IP statuses or changes – Nosotros select the one we created. The default notification is to the Account Possessor which is the email accost on file for the business relationship (yous can view this under the Config – Users carte).

C. Select a maximum number of emails yous would like to receive regarding each system monitoring and/or failover event

D.Select a Sensitivity Level – The sensitivity option in DNS Failover allows you to specify different numbers of checks the monitoring locations will make against the IP. High Sensitivity ways fewer checks, three checks are fabricated in firsthand succession of 1 another to ostend the status of the server. Medium Sensitivity (which is the default) performs six immediate checks. Low Sensitivity performs nine immediate checks. The lower the sensitivity level, the more confirmations the monitoring servers volition brand.

Due east. Configure a port and protocol to monitor based on what criteria you want to confirm is reachable on your server. In the instance here we are configuring the master IP address of 1.ii.iii.4 to be monitored on HTTP port lxxx and failing over to the IP address 1.2.3.five if the primary is not available.

F.Enter the fully qualified domain proper noun of the arrangement you are monitoring. This is the full hostname of the monitored organization.

• This is optional. Nosotros take also added a file and string to query for in the HTTP configuration (this is but instance information), these fields are optional with an HTTP or HTTPS configuration. The system will query http://ane.2.3.iv:80/alphabetize.html and look for the string of Upwardly in the showtime 1KB of text on that page. All these criteria must be met for the IP to be considered online. In improver, the webserver must answer with a 200 response lawmaking.
• This is optional. We have also enabled the "Plough off auto-failover after start failure" feature with a checkmark. This means that DNS Failover volition not revert traffic back to the master IP address automatically. The current IP will remain one.two.3.5 until it is manually edited information technology back to 1.two.three.4.
• Configure the same settings for the second A record with an IP of 1.two.3.5. We are configuring the primary IP address of 1.2.3.5 to be monitored on HTTP port 80 and failover to the IP address one.2.three.4 if the chief is not available. Now, if 1.2.3.4 is not available 100% of traffic volition exist sent to 1.2.3.5, and if ane.2.3.5 is not available 100% of traffic will be sent to 1.2.3.four. If both IP addresses are bachelor traffic will be split up 50/l betwixt one.2.iii.iv and 1.2.3.5.

For your data, beneath is the list of networks our monitoring services will cheque your primary IP address from:

• 208.94.147.0/24
• 208.94.150.0/24
• 208.94.151.0/24
• 96.45.91.0/24
• 96.45.92.0/24
• 96.45.93.0/24

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Source: https://support.dnsmadeeasy.com/support/solutions/articles/47001000470-configure-dns-failover-with-round-robin

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