as build docker code example

Example 1: docker copy from another image

FROM golang:1.7.3 AS builder
WORKDIR /go/src/github.com/alexellis/href-counter/
RUN go get -d -v golang.org/x/net/html  
COPY app.go    .
RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o app .

FROM alpine:latest  
RUN apk --no-cache add ca-certificates
WORKDIR /root/
COPY --from=builder /go/src/github.com/alexellis/href-counter/app .
CMD ["./app"]

Example 2: docker build

docker build -t [tag] .

Example 3: docker build -t

--tag , -t   ---->   Name and optionally a tag in the ‘name:tag’ format

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