![]() ![]() You can now open the feature branch at the URL Traffic splitting, canary, and blue/green deployments This is deployed with the command: gcloud app deploy dispatch.yaml -project mattctest These dispatch rules define how traffic is routed from a URL to a service: dispatch: This allows you to test some traffic routing rules that means you can access the new service from a URL like (as opposed to the unique service URL of To route the subdirectory of blueheader to the new service, create a file called displatch.yaml with the following content. This defines the context path that the web app expects to receive traffic from. I have also defined the SERVER_SERVLET_CONTEXT_PATH environment variable, setting it to /blueheader. I've given this service a new name to match the name of the feature branch. SERVER_SERVLET_CONTEXT_PATH: "/blueheader" The app.yaml file for this branch looks like this: runtime: java11 To simulate this, deploy the blueheader branch of your web app, which changes the background color of the banner to blue. The deployment logs return a URL like to the live service, which you can open in a web browser:Ī common deployment pattern is to have feature branches deployed side by side with the mainline branch. Your compiled application is then deployed. To deploy the web app, run the following command, replacing the name of the project to match your environment: gcloud app deploy. This creates a JAR file under the target directory.Īt the time of writing, the sample application is at version 0.1.9, so the JAR file is called target/randomquotes.0.1.9.jar. The F2 instance provides 512MB of memory, which you need for your web app.Ĭompile the Java application with the command. This is defined in the instance_class property. You also need to use a slightly larger instance than what is provided by default. If you try to deploy a service with a name other than default, you get the error: The first service (module) you upload to a new application must be the 'default' service (module). The first service that's deployed to GAE must be called default, so I defined that name in the service field. I use java11 here as Java 11 is part of the GAE second generation. I couldn't find a definite list of runtimes, but java, java8, and java11 are all included in various places in the documentation and examples. The runtime is a required property defining the platform that will host your code. Here is an example app.yaml file that you can use to define and deploy your Java web app: runtime: java11 Services are (somewhat confusingly) defined in a file called app.yaml. An application resource can host many services, where each service runs your own application. With your application resource created, you can deploy your web app. You can deploy your application using `gcloud app deploy`. If you attempt to create another application, say in a different region, you see an error like this: ERROR: () The project already contains an App Engine application. Only one application resource can exist per project. The end result of this process is the creation of the Application shown in the diagram below: Some instructions on the next steps are provided while the GAE instance is being created. You then define the environment that will host your web app: The first step is to select where the application resource will be hosted: The steps below show an application resource being created via the web console. To deploy the application, you need to create a corresponding GAE application resource inside a GCP project. This application generates a self contained JAR file hosting the application and a built-in web server. The source code for this application can be found in GitHub. Our sample application is a simple Java Spring web app called Random Quotes. Go is the notable exception, and in that case you do need to deploy your source code and allow GAE to compile it for you. Other runtimes like Node, Python, Ruby, and PHP don't typically produce compiled applications. The ability to deploy a compiled application is unique to Java in GAE. ![]()
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