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Hostname based failover

Solved754 views28th March 2024
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Chris Glover [DevOps Advocate]1.13K 27th March 2024 0 Comments

Hi,

I'm about to configure hostname based failover for my DMS. The documentation is a bit vague about what should be configured in DNS.

I'm assuming I need to create A records with the same hostname pointing to two IPs e.g.

failover_hostname.domain.com A 10.0.0.1

failover_hostname.domain.com A 10.0.0.2

Thanks

Chris Glover [DevOps Advocate] Selected answer as best 28th March 2024

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Michiel Saelen [SLC] [DevOps Enabler]5.63K Posted 28th March 2024 2 Comments

Hi Chris,

This is indeed correct. When you connect to your failover pair, you use the hostname instead of the IP which will resolve in one of the two IPs. If it resolves into the inactive, then it will rewrite the URL to point to the active DMA. This happens through URL rewrite rules under the default website in IIS. This rule will automatically be enabled/disabled by DM.

If you are using HTTPS, you need to ensure that you are using certificates that have the hostname you use to connect in the subject or in the subject alternative names. To test if your certificate is valid you can use https://[YOUR_HOSTNAME]/ConnectionSettings.txt from your browser from where you want to connect. The browser will typically tell you if there is a certificate issue.

Chris Glover [DevOps Advocate] Posted new comment 28th March 2024
Michiel Saelen [SLC] [DevOps Enabler] commented 28th March 2024

Note: The ConnectionSettings.txt will not rewrite to the active one. This will always give the information from the IP that was resolved.

Chris Glover [DevOps Advocate] commented 28th March 2024

Brilliant! Thanks very much

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