Tomcat Nginx Redis session sharing process diagram

1. Preparation

Middleware: Tomcat, Redis, Nginx

Jar package: commons-pool2-2.4.2.jar, jedis-2.8.0.jar, tomcat-redis-session-manager-2.0.0.jar

2. Configure Tomcat

Multiple Tomacats need to be configured with different port numbers

/lib

Store the jar package in this location

/conf/server.xml

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/conf/context.xml

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host is the IP address of Redis, port is the port, and database is the database.

Nginx

/conf/nginx.conf

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Upstream means the configuration server list. In this example, two tomcats are started, with ports 8080 and 9999 respectively.

proxy_pass means to configure the proxy server.

This configuration means listening to port 80 of the local (192.168.0.113) and forwarding requests to the Tomcat servers at 8080 and 9999 in a round-robin manner.

Redis

Redis does not require any special configuration, just start it.

3. Testing

Start the Redis service, two tomcat servers, and the Nginx server one after another.

Add a mark to the Tomcat startup page to check whether the sessionIds in the two servers are consistent.

/webapps/ROOT/index.jsp:

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IV. Results

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If you cannot switch to the page corresponding to the port by pressing F5 to refresh the page, it may be due to the browser cache.

Solution: Clear cache and refresh, alt+F5

At this point, you can see that multiple tomcat services are constantly polling, and the sessionId is consistent.

Then use the Redis desktop management tool to view the information:

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You can see that the session information has been handed over to Redis for management.

Achieve success.

5. Disadvantages

This method depends on the Tomcat container. If the middleware is replaced with Jetty or other, it will not work.

There is also a better implementation method: Spring Session + Redis

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