Use docker multi-stage to build docker images.

bookings/Dockerfile

@@ -1,5 +1,5 @@
 # golang image where workspace (GOPATH) configured at /go.
-FROM golang:1.11.2
+FROM golang:1.11.2 as dev
 
 # Install dependencies
 RUN go get gopkg.in/mgo.v2
@@ -11,11 +11,17 @@ ADD . /go/src/github.com/mmorejon/cinema/bookings
 # Setting up working directory
 WORKDIR /go/src/github.com/mmorejon/cinema/bookings
 
-# Build the bookings command inside the container.
-RUN go install github.com/mmorejon/cinema/bookings
+# build binary
+RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o bookings .
 
-# Run the bookings microservice when the container starts.
-ENTRYPOINT /go/bin/bookings
 
+# alpine image
+FROM alpine:3.9.2 as prod
+# Setting up working directory
+WORKDIR /root/
+# copy movies binary
+COPY --from=dev /go/src/github.com/mmorejon/cinema/bookings .
 # Service listens on port 8080.
 EXPOSE 8080
+# Run the movies microservice when the container starts.
+ENTRYPOINT ["./bookings"]

movies/Dockerfile

@@ -1,5 +1,5 @@
 # golang image where workspace (GOPATH) configured at /go.
-FROM golang:1.11.2
+FROM golang:1.11.2 as dev
 
 # Install dependencies
 RUN go get gopkg.in/mgo.v2
@@ -11,11 +11,17 @@ ADD . /go/src/github.com/mmorejon/cinema/movies
 # Setting up working directory
 WORKDIR /go/src/github.com/mmorejon/cinema/movies
 
-# Build the movies command inside the container.
-RUN go install github.com/mmorejon/cinema/movies
+# build binary
+RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o movies .
 
-# Run the movies microservice when the container starts.
-ENTRYPOINT /go/bin/movies
 
+# alpine image
+FROM alpine:3.9.2 as prod
+# Setting up working directory
+WORKDIR /root/
+# copy movies binary
+COPY --from=dev /go/src/github.com/mmorejon/cinema/movies .
 # Service listens on port 8080.
 EXPOSE 8080
+# Run the movies microservice when the container starts.
+ENTRYPOINT ["./movies"]

showtimes/Dockerfile

@@ -1,5 +1,5 @@
 # golang image where workspace (GOPATH) configured at /go.
-FROM golang:1.11.2
+FROM golang:1.11.2 as dev
 
 # Install dependencies
 RUN go get gopkg.in/mgo.v2
@@ -11,11 +11,17 @@ ADD . /go/src/github.com/mmorejon/cinema/showtimes
 # Setting up working directory
 WORKDIR /go/src/github.com/mmorejon/cinema/showtimes
 
-# Build the showtimes command inside the container.
-RUN go install github.com/mmorejon/cinema/showtimes
+# build binary
+RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o showtimes .
 
-# Run the showtimes microservices when the container starts.
-ENTRYPOINT /go/bin/showtimes
 
+# alpine image
+FROM alpine:3.9.2 as prod
+# Setting up working directory
+WORKDIR /root/
+# copy movies binary
+COPY --from=dev /go/src/github.com/mmorejon/cinema/showtimes .
 # Service listens on port 8080.
 EXPOSE 8080
+# Run the movies microservice when the container starts.
+ENTRYPOINT ["./showtimes"]

users/Dockerfile

@@ -1,5 +1,5 @@
 # golang image where workspace (GOPATH) configured at /go.
-FROM golang:1.11.2
+FROM golang:1.11.2 as dev
 
 # Install dependencies
 RUN go get gopkg.in/mgo.v2
@@ -11,11 +11,17 @@ ADD . /go/src/github.com/mmorejon/cinema/users
 # Setting up working directory
 WORKDIR /go/src/github.com/mmorejon/cinema/users
 
-# Build the users command inside the container.
-RUN go install github.com/mmorejon/cinema/users
+# build binary
+RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o users .
 
-# Run the users microservice when the container starts.
-ENTRYPOINT /go/bin/users
 
+# alpine image
+FROM alpine:3.9.2 as prod
+# Setting up working directory
+WORKDIR /root/
+# copy movies binary
+COPY --from=dev /go/src/github.com/mmorejon/cinema/users .
 # Service listens on port 8080.
 EXPOSE 8080
+# Run the movies microservice when the container starts.
+ENTRYPOINT ["./users"]