loadBalancer

Short example to explain in a simple way how works a load balancer using nginx and docker.
for this part We are using the "Least connection" method for load balance

Requirements

• docker version 19.03.13
• node version v14.15.0

Steps

Build the docker images

• docker build -t server-app:1.0.0 .
• cd gateway && docker build -t gateway:1.0.0 .

Run the numbers of containers/servers wich do you want(for this example we will use four container/servers

• docker run -d -p 4001:4000 --name server-01 -e "server=one" server-app:1.0.0
• docker run -d -p 4002:4000 --name server-02 -e "server=two" server-app:1.0.0
• docker run -d -p 4003:4000 --name server-03 -e "server=three" server-app:1.0.0
• docker run -d -p 4004:4000 --name server-04 -e "server=four" server-app:1.0.0

Run the load balancer container

• docker run -p 4000:80 -d gateway:1.0.0