onestraw/golb

:octopus: Yet another load balancer

Go LB

Yet another load balancer

Features

• roundrobin: smooth weighted roundrobin method
• chash: cosistent hashing method
• balancer: multiple LB instances, passive health check, SSL offloading
• controller: dynamic configuration, REST API to start/stop/add/remove LB at runtime
• service discovery: autodiscover backend services with etcd or consul
• statistics: HTTP method/path/code/bytes
• conf: yaml and json configuration

Examples

• Basic configuration and REST API
• SSL offloading
• Service discovery with etcd
• Service discovery with consul

LICENSE

MIT License

Copyright (c) 2018 Larry He

golb's Issues

Distributed Load Balancing

To use service discovery

https://enginyoyen.com/distributed-load-balancing/
https://events.static.linuxfound.org/sites/events/files/slides/DLB-LinuxConf-Berlin.pdf

links

• Uber's leaky-bucket ratelimit
• Netflix zuul's features
• Kong - Nginx/Openresty
• Tyk - Go
• Traefik

LB 学习索引

1. 集中式 vs 分布式
   部署形式上的分类，集中式：网关代理形式，分布式：同一集群各实例分别进行负载均衡（也有叫软LB）

2. 集中式的代表
   硬件 F5
   软件 LVS / HAPorxy / Nginx (Tengine/OpenResty)

3. 4层 vs 7层
   按TCP/IP协议栈层次划分
   4层：tcp/udp
   7层：http

4. 算法
   round robin
   consistent hash
   ip hash
   least connection

5. 健康检查

6. 会话维持

7. 服务发现
   etcd
   consul
   zookeeper

8. 其它
   谁给网关LB：ECMP / DNS调度
   底层加速：dpdk
   高可用部署：keepalived

9. 链接
   Nginx upstream http://nginx.org/en/docs/http/ngx_http_upstream_module.html
   美团4层LB https://tech.meituan.com/2017/01/05/mgw.html
   https://github.com/cristaloleg/awesome-load-balancing

retry middleware

resend the request to another server in case of 50X

add vendor folder please.

see title.

Can you provide a webui for controller

API doc https://godoc.org/github.com/onestraw/golb/controller

auto-discover backend server

service discovery with etcd