Docen

Simple utility for generating Dockerfile for golang projects.

Installation

go get github.com/lobz1g/docen

Usage

package main

import (
	"log"

	"github.com/lobz1g/docen"
)

func main() {
	err := docen.New().
		SetGoVersion("1.14.9").
		SetPort("3000").
		SetTimezone("Europe/Moscow").
		SetTestMode(true).
		SetAdditionalFolder("my-folder/some-files").
		SetAdditionalFile("another-folder/some-files/file").
		GenerateDockerfile()
	if err != nil {
		log.Fatal(err)
	}
}

Dockerfile will be created in the root dir of the project.

FROM golang:1.14.9-alpine as builder
RUN apk update && apk add --no-cache git ca-certificates tzdata && update-ca-certificates
RUN adduser -D -g '' appuser
RUN mkdir -p /docen
RUN mkdir -p /docen/my-folder/some-files
RUN mkdir -p /docen/another-folder/some-files
COPY . /docen
WORKDIR /docen
RUN CGO_ENABLED=0 go test ./...
RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build  -ldflags="-w -s" -o /docen
FROM scratch
COPY --from=builder /usr/share/zoneinfo /usr/share/zoneinfo
COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
COPY --from=builder /etc/passwd /etc/passwd
ENV TZ=Europe/Moscow
COPY --from=builder /docen /docen
COPY --from=builder /docen/my-folder/some-files /docen/my-folder/some-files
COPY --from=builder /docen/another-folder/some-files /docen/another-folder/some-files
COPY --from=builder /docen/another-folder/some-files/file /docen/another-folder/some-files/file
USER appuser
EXPOSE 3000
ENTRYPOINT ["/docen"]

Options

All methods are optional. That means there are default values for success creating Dockerfile without any settings.

Just use below code for generating Dockerfile with default values:

err := docen.New().GenerateDockerfile()
if err != nil {
    log.Fatal(err)
}

Image

By default, the image name is golang and the tag is {your_golang_version}-aplpine. If the runtime.Version method returns wrong information about your golang version it will be just alpine image tag. You can set the version by method SetGoVersion without any settings.

Expose port

By default, Dockerfile will be without the expose port field. You can set the port by method SetPort. The argument can be a single value of port, for example 3000, or a range of values, for example 3000-4000.

Timezone

By default, Dockerfile will be without the timezone env field. You can set the timezone by method SetTimezone.

Testing

The image is built without testing, but you can test the app before build. Use the method SetTestMode for it.

Additional folders to image

Such folders as assets, config, static and templates are added to the image. You can add additional folders by method SetAdditionalFolder.

Additional files to image

You can set additional files which should be added to the image. Use the SetAdditionalFile method for it. It also adds additional folders for these files.