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Connecting to a Redis instance from an App Engine standard environment application | Memorystore for Redis

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You can connect to a Redis instance from the App Engine standard environment by using Serverless VPC Access.

If you have already installed the Google Cloud CLI and have created a Redis instance, you can skip these steps.

1. Install the gcloud CLI and initialize:

   gcloud init
   

2. Follow the Quickstart Guide to create a Redis instance. Take note of the zone, IP address, and port of the Redis instance.

To connect from your App Engine app to your Redis instance's authorized VPC network, you must set up Serverless VPC Access.

1. Find your Redis instance's authorized network by running the command:

   gcloud redis instances describe [INSTANCE_ID] --region [REGION]
   

2. Follow the instructions at Creating a connector to create a Serverless VPC Access connector. Make sure you create the connector in the same region as your app, and make sure the connector is attached to the Redis instance's authorized VPC network. Remember the name of the connector.

This sample HTTP server application establishes a connection to a Redis instance from an App Engine standard environment app.

Clone the repository for your desired programming language and navigate to the folder that contains the sample code:

git clone https://github.com/GoogleCloudPlatform/golang-samples
cd golang-samples/memorystore/redis

git clone https://github.com/GoogleCloudPlatform/java-docs-samples
cd java-docs-samples/memorystore/redis

git clone https://github.com/GoogleCloudPlatform/nodejs-docs-samples
cd nodejs-docs-samples/memorystore/redis

git clone https://github.com/GoogleCloudPlatform/python-docs-samples
cd python-docs-samples/memorystore/redis

This sample application increments a Redis counter every time the / endpoint is accessed.

This application uses the github.com/gomodule/redigo/redis client. Install it by running the following command:

go get github.com/gomodule/redigo/redis

This application is Jetty 3.1 servlet-based.

It uses the Jedis library:

The AppServletContextListener class is used to create a long-lived Redis connection pool:

The VisitCounterServlet class is a web servlet that increments a Redis counter:

This application uses the redis module.

This application uses Flask for web serving and the redis-py package to communicate with the Redis instance.

To access the Redis instance, the App Engine app must be configured to use your Serverless VPC Access connector, and you must provide your Redis instance's connection details.

1. If you don't already have one, create an App Engine application.

2. Update the app's configuration to specify your Serverless VPC Access connector and the IP address and port of your Redis instance:

To deploy the application:

1. Copy necessary configuration files into the source directory:

   Go

   Copy the app.yaml and go.mod files into the source directory:

   cp gae_standard_deployment/{app.yaml,go.mod} .
   

   Java

   Copy the appengine-web.xml file into the source directory:

   mkdir -p src/main/webapp/WEB-INF
   cp gae_standard_deployment/appengine-web.xml src/main/webapp/WEB-INF/
   

   Node.js

   Copy the app.yaml file into the source directory:

   cp gae_standard_deployment/app.yaml .
   

   Python

   Copy the app.yaml file into the source directory:

   cp gae_standard_deployment/app.yaml .
   

2. Run the deploy command:

   Go

   gcloud app deploy
   

   Java

   mvn package appengine:stage
   gcloud app deploy target/appengine-staging/app.yaml
   

   Node.js

   gcloud app deploy
   

   Python

   gcloud app deploy
   

After the deployment is complete, the command will output the URL where you can visit your app. If you visit this URL, you will see the count on your Redis instance increase each time the page is loaded.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-08-07 UTC.

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