I've recently gotten scalr installed and able to launch a farm with
the standard roles www, app and mysqllvm.
In the farm config I specified 1 www, 1-2 app and 1 mysqllvm (for
now).

Every time I launch the farm is spins-up more instances that are
necessary - for example, 3 instances of www, two instances app and 1
instance of mysqllvm. I've increased the default timeout and the
timeouts for each role to be 600s.  Looking at the event logs:

20-05-2009 15:16:02     INFO    Cloud   PollerProcess   Farm Cloud, role
app scaling down. i-b7d2a9de will be terminated in 44.1 minutes.
Launch time: 2009-05-20T15:10:07.000Z, Current time: 2009-05-20
15:16:02
20-05-2009 15:15:03     INFO    Cloud   PollerProcess   Farm Cloud, role app
scaling down. i-b7d2a9de will be terminated in 45.1 minutes. Launch
time: 2009-05-20T15:10:07.000Z, Current time: 2009-05-20 15:15:03
20-05-2009 15:14:20     INFO    Cloud   i-b7d2a9de/trap-hostup.sh
10.252.178.9 UP. Scalr notified me that 10.252.178.9 of role app
(Custom role: app) is up.
20-05-2009 15:14:19     INFO    Cloud   EventObserver   Instance i-7dd1aa14.
Is DB Master = 0
20-05-2009 15:14:14     INFO    Cloud   i-7dd1aa14/trap-inithost.sh
Received INIT trap from UDP: [174.129.119.97]:32979 (AWS account ID:
273151577831). Finishing host start-up.
20-05-2009 15:14:11     INFO    Cloud   i-7dd1aa14/instance-init.sh     Host
10.252.178.9/app initialized. Awaiting authentication data.
20-05-2009 15:14:03     WARN    Cloud   PollerProcess   Disaster: No
instances running in role mysqllvm!
20-05-2009 15:13:28     INFO    Cloud   EventObserver   Instance i-b7d2a9de.
Is DB Master = 0
20-05-2009 15:13:28     INFO    Cloud   EventObserver   Adding system A
records to zone cloud.apez.biz
20-05-2009 15:13:24     INFO    Cloud   i-b7d2a9de/trap-inithost.sh
Received INIT trap from UDP: [174.129.119.97]:32979 (AWS account ID:
273151577831). Finishing host start-up.
20-05-2009 15:13:20     INFO    Cloud   i-b7d2a9de/instance-init.sh     Host
10.254.91.131/app initialized. Awaiting authentication data.
20-05-2009 15:13:02     WARN    Cloud   PollerProcess   Disaster: No
instances running in role www!
20-05-2009 15:12:03     WARN    Cloud   PollerProcess   Disaster: No
instances running in role www!
20-05-2009 15:11:02     WARN    Cloud   PollerProcess   Disaster: No
instances running in role www!
20-05-2009 15:10:02     WARN    Cloud   PollerProcess   Disaster: No
instances running in role app!
20-05-2009 15:09:04     WARN    Cloud   PollerProcess   Disaster: No
instances running in role app!

Any idea why it does this?

It also seems to confuse itself with the multiple www roles and the
single elastic IP address, finally leaving the DNS zone records for
www.%hostname% pointing to the dynamic external address instead of the
elastic one (but reporting the elastic one on the scalr pages).  Using
the edit zone function and hitting save causes it to update correctly
though.

Making progress :)
(next I plan to attempt to customize the www load balancer role to use
Apache with mod_proxy and mod_rewrite as our application requires some
mod_rewrite-based traffic routing).

Cheers.

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