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This article shows you how to share Session through the configuration of Redis in Tomcat. The content is concise and easy to understand, which will definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.

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In order to make your application suffer more concurrency and improve the stability of your application, you need to expand your capacity under appropriate circumstances. The Tomcat under each node is only stored to access the session generated during the request. To solve the problem of session persistence after expansion, we provide the War package project of Java to implement the Session sharing solution using Tomcat configuration Redis, and store your session in redis to ensure the stability of your application. As shown in the figure:

If Load Balancing sends the request to tomcat A under container 1 and generates a session, the session is persisted to Redis. When Web Server sends a request again, if the request is sent to tomcat An of container 2, the existing session will be found in Redis.

By building with source code, you can configure redis to achieve session sharing in the following two ways:

Use Webapp-Runner or Jetty-Runner

Cloud gang uses tomcat embedded in webapp-Runner or jetty embedded in jetty-Runner to implement server functions. You can easily deploy applications to the cloud without creating other servers. Use the following steps to configure redis to achieve session sharing.

Configure Procfile: add the following command to your Procfile and add Procfile under the source root directory.

Web: java-jar. / webapp-runner.jar-- port 5000-- session-store redis. / * .war

Specify port in Procfile-- port 5000

Set port 8080 in the application console-port

Application port 8080, and application port 5000 is enabled by the platform by default, so that the port mapping is normal:

Specify session storage-session-store redis

Configure webserver: add a webserver file under the root directory of the source code, and write it to the webapp-runner version supported by the current platform:

Webapp-runner-7.0.57.2.jar

Webapp-runner-8.0.18.0-M1.jar

Webapp-runner-8.5.5.2.jar

Cloud help creates an application through source code, and selects the created Redis for dependency association in the create application-application settings.

Application configuration redis: add REDIS_URL to the application environment variable with a value of 127.0.0.1 6379.

Restart the application to adapt

To facilitate the dependency when creating applications, it is recommended to create Redis applications through the application market in advance. If you do not rely on Redis applications when creating applications, you can also associate Redis applications in the application console-dependency after the application is created. Remember to restart the app after the connection.

Use docker mirroring

Cloud gang provides a way to launch applications using custom tomcat containers. Use the following steps to configure redis to achieve session sharing.

Create a Dockerfile and write the following:

Use source code

Dockerfile FROM goodrainapps/tomcat:7.0.82-jre7-alpine RUN rm / usr/local/tomcat/webapps/ROOT COPY / usr/local/tomcat/webapps/ROOT # is the source directory name EXPOSE 8080

-use war package ```dockerfileFROM goodrainapps/tomcat:7.0.82-jre7-alpineRUN rm / usr/local/tomcat/webapps/ROOTCOPY .war / usr/local/tomcat/webapps/ROOT.warEXPOSE 8080

Verify that the source code or .war exists and exists in the same directory as the Dockerfile file, and start creating the application with this directory as the root directory.

In the create application-apply settings, select the created Redis for dependency association.

Application configuration redis: the configuration variable REDIS_URL is added to the application environment variable with a value of 127.0.0.1 REDIS_SESSION 6379; the configuration variable REDIS_SESSION is added to the application environment variable with a value of true.

Restart the application to adapt

The above is how to share Session by configuring Redis in Tomcat. Have you learned any knowledge or skills? If you want to learn more skills or enrich your knowledge reserve, you are welcome to follow the industry information channel.

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