https://github.com/seipan/mylb
⭐ Implementing a Load Balancer in Golang(just a toy) ⭐
https://github.com/seipan/mylb
go golang load-balancer load-balancing
Last synced: about 1 year ago
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⭐ Implementing a Load Balancer in Golang(just a toy) ⭐
- Host: GitHub
- URL: https://github.com/seipan/mylb
- Owner: seipan
- License: mit
- Created: 2023-09-27T15:34:43.000Z (over 2 years ago)
- Default Branch: main
- Last Pushed: 2024-06-05T03:17:33.000Z (about 2 years ago)
- Last Synced: 2025-04-18T20:44:28.574Z (about 1 year ago)
- Topics: go, golang, load-balancer, load-balancing
- Language: Go
- Homepage:
- Size: 59.6 KB
- Stars: 6
- Watchers: 2
- Forks: 0
- Open Issues: 3
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
[](https://github.com/seipan/loghook/actions/workflows/go.yml)
[](https://github.com/seipan/mylb/actions/workflows/e2e-testserver.yml)
# mylb
⭐ Implementing a Load Balancer in Golang(just a toy) ⭐
## Usage
### testserver
You can launch servers for load balancer testing. There are a total of four servers.
```
cd testserver
make up
```
If you want to restart the server, use the following command.
```
cd testserver
make re
```
The four servers to be launched are as follows.
```
http://localhost:8081
http://localhost:8082
http://localhost:8083
http://localhost:8085
http://localhost:8086
http://localhost:8087
http://localhost:8088
http://localhost:8089
```
The responses from these APIs are as follows:
```
{
"message": "ok",
}
```
Among these, 8081 and 8082 are set to wait 4 seconds before responding. This represents servers with slow responses.
```go
router.GET("/", func(c *gin.Context) {
time.Sleep(4 * time.Second)
c.JSON(200, gin.H{
"message": "ok",
})
})
```
### loadbalancer
There are two types of load balancers in this repository, representing different algorithms.
Specifically, there are two types: lc (Least Connections) and lr (Least Response Time).The two types can be changed by modifying the config.json.
```json:config.json
{
"type": "lr"
}
```
To launch the load balancer, enter the following command. (Don't forget to start the test server beforehand.)
```
make run
```
### Results
Let's take a look at the actual execution results from here.
First, let's take a look at the results for Least Connections.
```
make run
{"level":"info","msg":"access to endpoint","url":"http://localhost:8081/","connections":0}
{"level":"info","msg":"access to endpoint","url":"http://localhost:8081/","connections":0}
{"level":"info","msg":"access to endpoint","url":"http://localhost:8082/","connections":0}
{"level":"info","msg":"access to endpoint","url":"http://localhost:8083/","connections":0}
{"level":"info","msg":"access to endpoint","url":"http://localhost:8083/","connections":0}
{"level":"info","msg":"access to endpoint","url":"http://localhost:8081/","connections":0}
```
I think you can see that the server is actually being changed so that the connections become 0.
Next, let's take a look at the results for Least Response Time.
```
make run
{"level":"info","msg":"access to endpoint","url":"http://localhost:8085/","connections":0}
{"level":"info","msg":"access to endpoint","url":"http://localhost:8085/","connections":0}
{"level":"info","msg":"access to endpoint","url":"http://localhost:8085/","connections":0}
{"level":"info","msg":"access to endpoint","url":"http://localhost:8085/","connections":0}
```
Now, as explained earlier, you can see that there is no access to 8081 and 8082, which have slower responses.
## Reference
[Golangでロードバランサーを実装する](https://bmf-tech.com/posts/Golang%E3%81%A7%E3%83%AD%E3%83%BC%E3%83%89%E3%83%90%E3%83%A9%E3%83%B3%E3%82%B5%E3%83%BC%E3%82%92%E5%AE%9F%E8%A3%85%E3%81%99%E3%82%8B)
[Creating a Load Balancer in GO](https://medium.com/@leonardo5621_66451/building-a-load-balancer-in-go-1c68131dc0ef)
https://github.com/kasvith/simplelb
https://github.com/leonardo5621/golang-load-balancer
## License
Code licensed under
[the MIT License](https://github.com/seipan/mylb/blob/main/LICENSE).