使用viper 进行golang 应用的配置管理

├── Dockerfile
├── Makefile
├── README.md
├── cmd
│ └── yaml
│ └── main.go
├── docker-compose.yaml
├── go.mod
└── go.sum

package main
?
import (
 "bytes"
 "log"
?
 "github.com/spf13/viper"
)
?
func main() {
 viper.SetConfigType("yaml")
 var yamlExample = []byte(`
Hacker: true
name: steve
hobbies:
- skateboarding
- snowboarding
- go
clothing:
- jacket: leather
- trousers: denim
age: 35
eyes: brown
beard: true
`)
 viper.AutomaticEnv()
 if err := viper.ReadConfig(bytes.NewBuffer(yamlExample)); err != nil {
  log.Fatal("some error", err)
 }
 log.Print(viper.GetString("name"))
 viper.Set("name", "demoapp rong")
 log.Print(viper.GetString("name"))
 var appname string = viper.GetString("APIKEY")
 log.Print(appname)
}
?

build-app: clean make-dir build-mac build-linux build-windows
clean:
 rm -rf build/*
make-dir:
 mkdir -p build/{mac,linux,windows}
build-mac:
 CGO_ENABLED=0 GOOS=darwin GOARCH=amd64 go build -o build/mac ./cmd/...
build-linux:
 CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o build/linux ./cmd/...
build-windows:
 CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build -o build/windows ./cmd/...

FROM alpine
LABEL EMAIL=""
LABEL AUTHOR="dalongrong"
WORKDIR /app
COPY build/linux/yaml /app/yaml
RUN chmod +x /app/yaml
CMD [ "./yaml" ]

version: "3"
services: 
   app:
     build: ./
     image: dalongrong/viper-app
     env_file: 
     - .env

不包含环境变量的
go run cmd/yam/main.go
支持环境变量的
APIKEY=rongfengliang go run cmd/yaml/main.go

docker-compose build

docker-compose up

Attaching to viper-golang_app_1
app_1 | 2019/10/30 08:56:31 steve
app_1 | 2019/10/30 08:56:31 demoapp rong
app_1 | 2019/10/30 08:56:31 rongfengliang
viper-golang_app_1 exited with code 0