With New Relic APM's Go agent, you can monitor applications that reside in the Google App Engine (GAE) flexible environment. Adding New Relic to your GAE flex app gives you insight into the health and performance of your app and extends GAE with metrics you can view in New Relic APM, Browser, and Insights.
This document explains how to add New Relic to your GAE flex app by configuring a custom runtime, and gives an example of deploying a Go app with Docker.
The New Relic Go agent can run in a GAE flexible environment using a custom runtime. Due to limitations of other environments, do not use the GAE standard environment or Google App Engine's "native mode" installation.
Build a custom runtime using Docker
See Google's documentation for building custom runtimes. This example describes how to add New Relic to your GAE flex app by installing the New Relic Go agent, building a custom Go runtime for Docker, and deploying a golang application.
For more information about deploying and configuring your Go app in the GAE flexible environment, see:
- 1. Set up the GAE project and install dependencies
- Follow standard procedures to install the New Relic Go agent for your specific app server, including your license key.
- Follow Google App Engine procedures for Go to create a new Cloud Platform project, create an App Engine application, download and install git, and complete other prerequisites for the Google Cloud SDK.
The Google Cloud SDK provides the
gcloudcommand line tool to manage and deploy GAE apps.
- 2. Configure your app.yaml
app.yamlconfiguration file is required for a GAE flexible environment app with a custom runtime. At a minimum, make sure it contains:
runtime: custom env: flex
- 3. Configure a Dockerfile
The Dockerfile defines the Docker image to be built and is required for a GAE flexible environment app. The following Dockerfile example code defines the golang version used.
FROM golang:1.8-onbuild CMD go run main.go
- 4. Build a Docker image
To build the Docker image, run the following command. Be sure to include the period at the end of the code, to indicate the current directory contains the build files.
docker build --rm -t Docker-image-name .
- 5. Deploy Docker image to initialized GAE flexible environment
Recommendation: Disable health checks
Google App Engine sends periodic health check requests to confirm that an instance has been successfully deployed, and to check that a running instance maintains a healthy status. A health check is an HTTP request to the URL
If you create a custom runtime, your app must be able to handle a large number of health check requests. Otherwise, your app data may not display correctly in New Relic APM.
Recommendation: Configure your
app.yaml to disable health checks by adding:
health_check: enable_health_check: False
Get New Relic agent troubleshooting logs from GAE
Use these resources to troubleshoot your GAE flex environment app:
- To connect to the GAE instance and start a shell in the Docker container running your code, see GAE's documentation for debugging an instance.