The HAproxy load balancer has been utilized inside Docker containers.

Once installed the Docker, use the following command to create a new bridge network in Docker:

sudo docker network create --driver=bridge mynetwork

Next, launch two instances of the web application using httpd and nginx, using the docker run command.

docker run --name apachewebsite --network=mynetwork -v /home/ec2-user/consultancy-website-template:/usr/local/apache2/htdocs -p 8087:80 -itd httpd:latest
docker run --name nginxtest  --network=mynetwork -v /home/ec2-user/html:/usr/share/nginx/html -p 8082:80 -tid nginx:latest

[i have bind mount the website template using -v to the document root of the webservers]

Then Create a file named haproxy.cfg add the neccessary changes

Next, create and run an HAProxy container and map its port 80 to host's 80 port by including the -p argument. Also map port 8404 for the HAProxy Stats page:

 sudo docker run -d \
   --name haproxy \
   --net mynetwork \
   -v $(pwd):/usr/local/etc/haproxy:ro \
   -p 80:80 \
   -p 8404:8404 \
   haproxytech/haproxy-alpine:2.4 

As soon as make any modifications to that file, reload the haproxy configuration.

sudo docker kill -s HUP haproxy