There are several options for integrating a Load Balancer of Java Spring Boot applications. You don’t want to have the Java Backend do it all. Serving files for example is a job better than by CDN services.
Here are some popular Load Balancer options:
NGINX is a high-performance web server and reverse proxy that can also act as a load balancer. I’ve seened it used in front of all kinds of applications – including Spring Boot – to distribute incoming traffic across multiple instances of a service.
Apache HTTP Server
Similar to NGINX, Apache HTTP Server can be configured as a load balancer using modules like mod_proxy_balancer. It is the most common companion of PHP backend. It can distribute incoming requests among multiple Spring Boot instances using virtual hosts. For example – this is a definition grabbed from apache/conf/extra/httpd-ssl.conf
<VirtualHost _default_:12345> SSLEngine On SSLCertificateFile parth_to_ssl\fullchain.pem SSLCertificateKeyFile parth_to_ssl\privkey.pem ServerName yourdomain.xyx ProxyPreserveHost On ProxyAddHeaders On ProxyRequests Off ProxyPass /service1 http://localhost:8884/service1 ProxyPassReverse /service1 http://localhost:8884/service1 ProxyPass /service2 http://localhost:8885/service2
ProxyPassReverse /service2 http://localhost:8885/service2 </VirtualHost>
Spring Cloud Netflix Zuul
Zuul is a dynamic router and filter based on Netflix. It can be integrated into a Spring Boot application as a proxy and load balancer to forward requests to appropriate services. I’ve recently encountered a project: https://github.com/mudigal-technologies/microservices-sample that I may use myself.
Spring Cloud Gateway
This is another option provided by the Spring ecosystem. Spring Cloud Gateway offers a way to route requests to backend services and can be configured with load balancing strategies.
HAProxy is a widely used open-source software that provides high availability load balancing and proxying for TCP and HTTP-based applications. It can be configured to balance traffic to multiple Spring Boot instances.
Amazon Elastic Load Balancer (ELB)
If your Spring Boot application is deployed on AWS, you can use ELB to automatically distribute incoming application traffic across multiple targets, such as EC2 instances.
Google Cloud Load Balancing
Similar to ELB, Google Cloud Load Balancing can be used to distribute incoming traffic across multiple instances of a Spring Boot application deployed on Google Cloud Platform.
These are just a few options, and the choice depends on various factors such as deployment environment, scalability requirements, and specific features needed for your application.
I’m personally developing Micro Services. You could check them out here: https://programtom.com/dev/product-category/technologies/spring-boot-framework/?orderby=date-desc