Learn how to configure HAProxy ACL based on port. Our HAProxy Support team is here to help you with your questions and concerns.

HAProxy ACL based on port | Configuration Guide

Did you know that ACLs are used in HAProxy to define conditions according to different criteria?

These conditions play a key role in making routing decisions within the load-balancing configuration. ACLs offer flexibility and can be configured based on different parameters like ports.

To create an HAProxy ACL based on a specific port, we have to use the acl keyword in the HAProxy configuration.

For example:


# Define an ACL based on the port
acl is_http80 dst_port 80
acl is_https443 dst_port 443
# Use the ACLs to route traffic
use_backend backend_http if is_http80
use_backend backend_https if is_https443
# Define your backends
backend backend_http
mode http
server web_server_1 203.0.113.10:80
server web_server_2 203.0.113.11:80
backend backend_https
mode http
server secure_server_1 203.0.113.20:443
server secure_server_2 203.0.113.21:443


Here, dst_port indicates the destination port and use_backend directs traffic to a specific backend based on ACL conditions.

Our experts would like to point out that we have to tailor the ACL conditions and backend server configurations to match our unique use case and application architecture. If our HTTP runs on a different port or if we have customized our backend servers, we have to adjust the IP addresses and ports accordingly.

At the end of the day, HAProxy’s ACLs influence load-balancing decisions. With the acl keyword, users can fine-tune routing based on certain criteria, such as destination ports. However, when we implement this configuration, we have to adapt it to our specific requirements for optimal performance and seamless application delivery.

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Conclusion

Today, our Support Engineers demonstrated how to configure HAProxy ACL based on port.