We have an application that requires a few components to be installed in series and some of those components need to be built simultaneously. First we have cassandra which requires the IPs of all hosts that will be part of the cluster during install time. We don't have those IPs until the instances are launched which means we need the simultaneous launch of that farm so that we can discover all of the members in that cluster. After this it will move to the next components which aren't near as picky with other members being up and available. So if scalr could go through each farm role sequentially and launch the all of the farm role instances simultaneously that would be ideal.
On Monday, February 13, 2017 at 5:48:06 PM UTC-7, Marc O'Brien wrote: > > Hey Jeff, > > This functionality is not currently available in Open Source or Enterprise > Scalr. As of today only the Sequential and Simultaneous launch options are > available. Keep in mind that even if configured for Sequential launch > Scalr is only able to place the API call with your Cloud Provider for > handling and it is possible that your observed launch order may in some > cases differ from what you have defined in the Farm Designer. Typically > this is par for the course in the Cloud as failures may occur at any time, > and the right solution here is to alter the way of thinking about > application architecture so that you account for the typical types of > failures that can and will occur for cloud resources. (Ref. Pets vs. Cattle > ideology) Ideally your application and the Orchestration logic you > implement will allow for dynamic (re)configuration of your nodes and > services to maintain operability, regardless of the order launched or > unexpected scale in/out events. If this is a hard requirement for your use > case you may be able to work around this by using custom scaling metrics or > our API to increase autoscaling minimum from 0 to your desired count for > each subsequent Farm Role in sequence after the successful simultaneous > launch of your first Farm Role, but of course this will require quite a bit > of logic design on your end to achieve your desired results. Having said > that, we are always looking for feedback and new use cases from our users > so that we can ensure Scalr meets our customer's needs as efficiently as > possible. If you do have a use case where this functionality would be a > hard requirement, could you please provide any details you may be able to > share about such a use case? > > Many thanks, > Wm. Marc O'Brien > Scalr Technical Support > > > > > On Monday, February 13, 2017 at 5:27:53 PM UTC-7, Jeff Gojkovich wrote: >> >> Is there a way within Opensource Scalr to launch an entire farm role >> simultaneously and then each farm role serially? >> >> -- >> Jeff >> > -- You received this message because you are subscribed to the Google Groups "scalr-discuss" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
