Hey Hussein,

How did you manage network configurations in app.yaml file for App Engine. 
I have an App Engine Flex and an Elasticsearch on Compute Engine under same 
VPC. But i am not able to connect my app engine to the internal ip of 
compute engine to access elasticsearch.

Thanks.!

On Friday, May 8, 2015 at 3:03:09 AM UTC+5:30, Hussein Vastani wrote:
>
> Hi,
> At my current gig we've been grappling with the same problem, and there 
> seems to be a solution in the 1.9.19 SDK release (finally!). 
>
> So my context is: my java frontend instances need to hit my elasticsearch 
> cluster hosted on GCE. The only way to reach the cluster was via a reverse 
> proxy exposed through a GCE public IP address. I was using basic auth to 
> authenticate my App Engine frontend instances. As you would expect the 
> latency has been hurting. Search queries that should take 10ms, instead 
> come back in 150ms (10x slow). After additional processing in my frontend 
> request, that adds up pretty quickly to noticeable latency user-side. 
>
> I posted about the problem some time ago in this group here 
> <https://groups.google.com/d/topic/google-appengine/rfRIECYud94/discussion> 
> and 
> the issue tracker here 
> <https://code.google.com/p/googleappengine/issues/detail?id=11679>. I got 
> an acknowledgement from Google and the fix appeared in the 1.9.19 release, 
> a bit quietly (the issue is still open).
>
> So the solution for me is to run a managed VM on the same network as my 
> elasticsearch cluster, and that way I should be able to access my cluster 
> "directly" using internal network addresses, without going out of the 
> Google network. The 1.9.19 SDK allows you to specify a network in the 
> configuration for your managed vm, that defaults to the default GCE network 
> of your project. Thus I either directly route my search requests to my 
> managed VM or have my front end instances talk to my managed VM over http. 
>
> (For my particular case, I expect additional latency savings because I can 
> run a full elasticsearch client on the managed VM that knows the cluster 
> state, instead of using the naked elasticsearch REST API, as I do now, from 
> my front end instances. That saves me an additional network hop that is 
> needed to figure out which nodes in my cluster to hit.)
>
> I guess, the same should work for you no?
>
> I'll post next week about the results of migrating to a managed VM setup.
>
> Good luck!
> H
>
>
> On Thursday, May 7, 2015 at 1:52:39 PM UTC-4, Ian Childress wrote:
>>
>> We (our Go dev team) want to connect our app engine apps to our compute 
>> engine apps directly using internal IP address. From my understanding 
>> through documentation and exhaustive searching, the solution is to use a 
>> public IP address. This solution requires whitelisting an entire ip block 
>> (Google's ip block for app engine). This both increases security risk as 
>> well as charges additional bandwidth. The other solution is to use a 
>> messaging service PubSub. This is fine for submitting tasks to be performed 
>> by the back end app, but it prevents the app engine from receiving the 
>> response from the compute engine. 
>>
>> Have I missed the solution somewhere that allows for internal 
>> communication between app engine and compute engine? Using a job queue or 
>> public IP is not a replacement for an internal socket connection.
>>
>

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