To create a Docker image, we have added two new files to our project:
Dockerfile: Contains the needed commands to create the image..dockerignore: It works like .gitignore for git, it allows to
define which file/s should not be included in the Docker image when
the command ADD or COPY is/are invoked.# Use a golang image as base builder image
FROM golang:1.13 as builder
# Create the project's directory under the default GOPATH
RUN mkdir -p /go/src/github.com/iris-garcia/workday
# Use this directory as working directory
WORKDIR /go/src/github.com/iris-garcia/workday
# Copy the needed files to build the binary
COPY . /go/src/github.com/iris-garcia/workday/
# Install our build tool Mage
RUN go get github.com/magefile/mage
# Run the build stage
RUN mage build
# Use a small image to run the binary
FROM busybox:latest
# Use /root as working directory
WORKDIR /root
# Copy the built binary and its default config file
COPY --from=builder /go/src/github.com/iris-garcia/workday/api_server .
COPY --from=builder /go/src/github.com/iris-garcia/workday/db_config.toml .
# Run the API server
CMD ["./api_server"]The Dockerfile has comments for every command but it is worth to mention
that we are using a multi stage build which allows to use different FROM
instructions, each of them begins a new stage of the build.
Then we can copy artifacts from one stage to another, leaving behind everything we don’t want in the final image.
docs
deployment
.git
.github
internal
api_server
.idea
coverage.html
workday.coverprofile
.travis.yml
LICENSE
Dockerfile
README.org
.packer/.vagrant
.packer/packer_cache
.packer/builds