How can load balancing be achieved in Tomcat?

There are several ways to implement load balancing in Tomcat.

1. Utilizing Apache server as a reverse proxy allows for deploying multiple instances of Tomcat on different servers, and then using Apache as a reverse proxy to achieve load balancing through configuration of Apache’s load balancing module (such as mod_proxy_balancer).
2. Utilizing Tomcat clustering allows you to configure multiple Tomcat instances to form a cluster, and then use a load balancer (such as Apache’s mod_jk or mod_proxy_balancer) to distribute requests to different Tomcat instances, achieving load balancing.
3. Using a third-party load balancer: In addition to the built-in load balancing functions of Apache and Tomcat, one can also utilize other third-party load balancers such as Nginx, HAProxy, etc., to achieve load balancing by configuring these load balancers to distribute requests to multiple instances of Tomcat.

Here are some common methods for implementing load balancing, and in specific applications, one can choose the appropriate way to achieve load balancing based on their needs.