Do I need my own domain with Google App Engine? - google-app-engine

My application is to use the Google App Engine to provide an embarrassingly parallel computation (and to serve the results to www-browsers). I've been through the Google App Engine "getting started" tutorial but I'm not sure if I need to register my own domain. Do I?

Nope. You can get at your app using the URL <<your-app-id>>.appspot.com. If you later want to wire that up to a separate domain that you own, you can do that, too.

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GeoDNS routing on Google Cloud Load Balancer with Google App Engine as backend

We are looking to use Google App Engine for one of our low latency service. We are required to provide low latency service across the globe. Since Google App Engine is a regional service and there is no straight forward way to deploy it multi-regional. So, looking at Google Load Balancer to route at DNS level, but that also does not seems to be possible as load balancer not supporting App Engine as a backend service. Is there any other way to achieve GeoDNS routing in GCP for App Engine service.
There is not an direct way to achieve GeoDNS routing since App Engine is a regional service, as you said.
Read this feature request to have further insight on this. In the second comment they state the two possible workarounds, useful for both standard and flexible environments:
The workaround is how you mentioned, using a single project with a load balancer to route requests to Compute Engine instances in
different regions. Then have each Compute Engine instance act as
proxies to an App Engine project in each of the different regions
(where you would copy your code to each App Engine project).
It may be easier in the meantime to use Google Kubernetes Engine instead of App Engine for multi-regional application serving.
You could star the FR to support it.

Google Cloud Datastore requires app engine?

Im creating a Node.js website that probably won't have loads of traffic, and was looking into cheap solutions to host the site. Came across Google cloud services offering free usage for their services with limits. A f1-mirco is more than enough for my needs, but I will happily pay for some usage if it goes over by any chance.
I wanted to setup a linux centOS 7 on GCE (which I already did), and run my application and REST API on it. Now here comes the problem.
I tried to use Google's datastore service, but it sprung an app engine instance and without it datastore won't work.
Is datastore entirely relying on app engine to function?? In the docs, it said if you use any of the client API, it requires app engine. What can I do to not use the client api and query data then? Don't want to use the app engine at the moment or datastore is just not for me then?
Thanks for any help!
Some of the underlying infrastructure of Cloud Datastore and App Engine are still tied together for creation, etc. So while creating an Cloud Datastore database also defines an App Engine instance for the project, it doesn't require you to use it. You don't get charged for App Engine either, unless you decide to deploy an App using it.
You should be totally fine use the Google Cloud Node client library on the f1 micro instance.

How do I serve an app engine version via subdomain when my app runs through Google Apps?

I'm trying to use a subdomain to serve a matching version id with Google App Engine and Google Apps. I've gone through the documentation but it's still unclear to me.
On this page regarding custom domains, it says I'm in a special case for using Google Apps. test.example.com -> to load "test" version of the application.
https://cloud.google.com/appengine/docs/domain -
Note that the instructions on this page are for App Engine apps that use an ordinary HTTP connection and are not served through Google Apps. Here are some related procedures that require different instructions:
This leads me to here https://support.google.com/a/answer/91080
It looks like the only way to add this subdomain in Google Apps is the Sites URL field.
Will the Sites URL correspond to the App Engine version ID?
You only need to use Google Apps to map an appengine app to a domain if you need https. Right now, Google Apps is the only way you can upload an SSL cert - hence this restriction.
If you do map your appengine app to a domain through google apps, you can do what you want by using wildcard subdomain mapping. Read more here..
The whole process is tedious, slow, and painful, and thats only when its not confusing, so put aside a good few hours to make all the changes and wait for DNS to propagate.

Google App Engine Access Cloud Datastore from Different Project

I have been trying to find a solution to accessing a datastore in one project from a different google app engine project. I went through the tutorial on accessing a datastore from a different project's compute engine, however, this is not what I am looking for. What is required here is accessing a datastore on one project from a different app engine project. Has anyone done this successfully? Any ideas?
Cheers
As #Patrice says, this is possible by using the Remote API for Java (or for Python), which lets you access different App Engine services from any other application, as stated in the documentation.
For a more specific information on how to access the Datastore remotely with the Remote API, please take a look at this article from the documentation that explains step by step all the procedure.
Please, take into account that if your Google account is configured to use 2-Step Verification, you will need an App Password that authorizes the app to access your account resources.
there is actually an API that lets you make calls to App Engine services from anywhere, even from another App, as long as the credentials are ok, it's called the "remote API"

Do I have to use App Engine to write glassware with Mirror API?

I am trying Python quickstart project (https://developers.google.com/glass/develop/mirror/quickstart/python) and it is implemented on GAE, however, looking at the code it does not seem that there is much dependency on App Engine itself (code is kind of complicated and I still do not understand it all though).
Is this required to host Mirror-based glassware on App Engine?
Is this required to host Mirror-based glassware on App Engine?
No, it is not required. What you really need is ability to use Google API's and Mirror API is just one of them.
Java quick start, for example does not run on top of GAE.

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