allow control of EC2 elastic IPs
Bug #437877 reported by
Arjen Lentz
This bug affects 1 person
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
mysql-mmm |
New
|
Undecided
|
Unassigned |
Bug Description
MMM1 docu notes that EC2 does not support virtual IPs; this is outdated info (at least since March 2008).
See http://
In a nutshell: at EC2 the concept is called Elastic IPs, and there are commands to control them, once allocated.
All MMM2 needs to do it use those commands rather than its default arp response magic.
This can be used for the writer as well as the reader roles.
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Addendum... since there's already a hook for DNS control, perhaps a generic interface to allow multiple methods would be the way to go.
For the EC2 elastic IPs, apparently
- it's classified as "out-of-datacentre" traffic and thus charged.
- it's slightly slower, leading me to believe they might proxy it rather than assigning the IP to an instance.
Another method is to not use DNS but /etc/hosts and update it at high frequency.
With a generic interface we can add a few methods to choose from as appropriate.