How to freeze micro version with dependencies? - go

Question

I want to build a docker image with a fixed version of micro and go dependencies. I plan to do it with dep:
git checkout git#github.com:micro/micro.git
dep ensure
git add Gopkg.toml
git add Gopkg.lock
# Build micro
CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -ldflags '-w' -i -o micro ./main.go
# Build docker image
...
So, my question is does it the best solution to build consistent micro docker image?

Answer 1

An example of a Dockerfile can be:
FROM golang:1.9-alpine3.6 as builder
# Install package manager
RUN apk add --no-cache --virtual .go-dependencies git curl \
&& curl https://glide.sh/get | sh
# Copy files from context
WORKDIR /go/src/github.com/foo/bar
COPY . .
# Install project dependencies, test and build
RUN glide install \
&& go test ./... \
&& CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -ldflags '-w' -i -o ./entry ./main.go ./plugins.go
# Build final image with binary
FROM alpine:3.6
RUN apk add --update ca-certificates && \
rm -rf /var/cache/apk/* /tmp/*
WORKDIR /
COPY --from=builder /go/src/github.com/foo/bar/entry .
ENTRYPOINT [ "/entry" ]
And the glide.yaml would look like this:
package: .
import:
- package: github.com/micro/go-micro
version: ^0.3.0
subpackages:
- client
- server
- package: github.com/micro/go-plugins
version: ^0.6.1
subpackages:
- wrapper/trace/opentracing
- broker/nats
- transport/nats
- package: github.com/opentracing/opentracing-go
version: ^1
- package: github.com/openzipkin/zipkin-go-opentracing
version: ^0.3
testImport:
- package: github.com/golang/mock
subpackages:
- gomock
- package: github.com/smartystreets/goconvey
subpackages:
- convey

Answer 2

In my case, dep looks great and fast enough, moreover, it's official dependency manager in go so I think it's a right choice.