DLB Demo

Dynamic Load Balancing demo for introducing OpenResty.

First used in #18 A2OS Weekly.

Table of Contents

• Quickstart
• Example Results
• TODO
• Copyright

Quickstart

$ git clone https://github.com/Triple-Z/dlb-demo
$ cd dlb-demo/
$ docker-compose up

Then visit the http://localhost:8888 continuously, you will find out the response content number is changing all the time :P

Or use for i in {1..10} ; do curl http://localhost:8888 ; done instead.

Example Results

Backend server configs:

servers = {
    {
        host = "172.28.0.101",
        port = 80,
        weight = 5, -- backend 1
    },
    {
        host = "172.28.0.102",
        port = 80,
        weight = 3, -- backend 2
    },
    {
        host = "172.28.0.103",
        port = 80,
        weight = 2, -- backend 3
    },
}

Results:

# Round-robin (rr)
$ for i in {1..10} ; do curl http://localhost:8888 ; done
response from backend 1
response from backend 2
response from backend 3
response from backend 1
response from backend 2
response from backend 3
response from backend 1
response from backend 2
response from backend 3
response from backend 1

# Weighted round-robin (wrr)
$ for i in {1..10} ; do curl http://localhost:8888 ; done
response from backend 1
response from backend 1
response from backend 1
response from backend 1
response from backend 1
response from backend 2
response from backend 2
response from backend 2
response from backend 3
response from backend 3

# Smooth weighted round-robin (swrr)
$ for i in {1..10} ; do curl http://localhost:8888 ; done
response from backend 1
response from backend 2
response from backend 3
response from backend 1
response from backend 1
response from backend 2
response from backend 1
response from backend 3
response from backend 2
response from backend 1

TODO

• Round-robin
• weighted round-robin
• smooth weighted round-robin
• Health check
• IP hash
• consistency hash

Copyright

Copyright © 2020 Triple-Z

This project is open sourced by MIT License.