c-multi-stage.Dockerfile

### Below is used for representation purpose and is not in any way a working Dockerfile. 
FROM alpine:latest
RUN apk update && apk add --no-cache gcc musl-dev
COPY <prg>.c .
RUN gcc -static -o <prg> <prg>.c

FROM alpine:latest
COPY --from=0 <prg> /usr/bin/<prg>
ENTRYPOINT ["/usr/bin/<prg>"]

### Alternatively use scratch rather than alpine
FROM scratch
COPY --from=0 <prg> /usr/bin/<prg>
ENTRYPOINT ["/usr/bin/<prg>"]

golang-multi-stage.Dockerfile

### Below is used for representation purpose and is not in any way a working Dockerfile. 

FROM golang:alpine AS builder
COPY . /src
RUN cd /src && CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o <prg-binary>

FROM alpine
COPY --from=builder /src/<prg-binary> /app/
ENTRYPOINT ["/app/<prg-binary>"]

### Alternatively use scratch rather than alpine
FROM scratch
COPY --from=builder /src/<prg-binary> /src/<prg-binary>
ENTRYPOINT ["/src/<prg-binary>"]

### NOTE: Usage of scratch led to 4.41 MB reduction in size when compared to alpine

java-multi-stage.Dockerfile

### Below is used for representation purpose and is not in any way a working Dockerfile. 
### Here, we are using jdk to compile the program, but in order to run we just reuqire jre and not full blown jdk.

FROM java:openjdk-8-jdk-alpine
COPY <prg>.java .
RUN javac <prg>.java

FROM java:openjdk-8-jre-alpine
COPY --from=0 <prg>.class .
CMD java <prg>

### NOTE: Image size reduces by around 40 MB by just moving from jdk to jre.