High Availability Virtual IP address

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Andrew Westfall

March 04, 2013 22:55

We are continually plagued by the inability to use a basic HA IP address between mutliple VMs. This would allow you to run a truly redundant load balancer setup within a cloud, unlike what is currently supported with the built in OnApp load balancer. 

 

The main reasons for this request are to provide always available services, such as web, database and email etc. The current OnApp firewall prevents more than one VM from having the same IP as another, thus defeating the logic behind a virutal IP address. 

 

This would be a great addition to in OnApp 3.1 so that others can run truly redundant services within the same cloud.

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  Trent Lloyd March 12, 2013 03:35

  It is possible to add the same IP address to more than 1 VM already, you can select to show already allocated IPs.
   

  You would just need to use some cluster software to handle flipping the IP between VMs.

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  Andrew Westfall May 24, 2013 07:15

  Unfortunately due to OnApp firewall restrictions the sharing of the same IP between two or more VMs is not possible.

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  Trent Lloyd May 24, 2013 09:16

  That is incorrect, you can add the same IP to more than 1 VM.  There is an option for it to "show used ips".

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  James Withall November 18, 2013 12:45

  To confirm, Trent is correct here, however this option does need to be enabled in Settings > Configuration > Defaults > Allows to start more than one Virtual Server with the same IP

  That could be why you were not seeing it previously Andrew.

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  Daniel Hoffman November 25, 2013 12:25

  We do this in a LOT of places and are known for complaining when it breaks! Since OnApp 3.0 stay away from keepalived as its multicast based and use heartbeat on linux.

   

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