build go docker image

2019-12-11

docker golang

> 本文介绍如何将go project构建到docker image中

直接上dockerfile（实际使用时，可以将基础镜像的版本替换为合适的版本）：

```Dockerfile
# Dockerfile References: https://docs.docker.com/engine/reference/builder/

# Start from the latest golang base image
FROM golang:1.13.4 as builder

# Add Maintainer Info
LABEL maintainer="Your name <your.email@example.com>"

# Set go proxy in china
ENV GOPROXY=https://goproxy.io

# Set the Current Working Directory inside the container
WORKDIR /app

# Copy go mod and sum files
COPY go.mod go.sum ./

# Download all dependencies. Dependencies will be cached if the go.mod and go.sum files are not changed
RUN go mod download

# Copy the source from the current directory to the Working Directory inside the container
COPY . .

# Build the Go app
RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o main .

######## Start a new stage from scratch #######
FROM alpine:3.10.3  

RUN apk --no-cache add ca-certificates

WORKDIR /root/

# Copy the Pre-built binary file from the previous stage
COPY --from=builder /app/main *.conf .

# # Expose port 8080 to the outside world
# EXPOSE 8080

# Command to run the executable
CMD ["./main"] 
```

利用multiple stage构建的image镜像仅包含需要的内容，会非常的小，节省大量空间。

## 参考

* [Building Docker Containers for Go Applications](https://www.callicoder.com/docker-golang-image-container-example/)

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