Better configuration design

[chickenlj]

Sample configuration file

https://cn.dubbo.apache.org/zh-cn/overview/reference/admin/architecture/#%E9%85%8D%E7%BD%AE%E6%89%8B%E5%86%8C-configuration

Reference implementation

• https://github.com/kumahq/kuma/blob/master/app/kuma-cp/cmd/run.go#L48
• https://github.com/kumahq/kuma/tree/master/pkg/config