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perteghella/hello-shell

By perteghella

•Updated about 2 years ago

Sample "Hello world" containerized web server written in GO and the tools of alpine

Image
Developer tools
Web servers
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perteghella/hello-shell repository overview

⁠Information

Docker Pulls

Sample "Hello world" web server written in GO and shell packed as image using Alpine linux⁠ as base image.

The images are hosted on Docker Hub https://hub.docker.com/r/perteghella/hello-shell⁠
Source code on Github https://github.com/Perteghella/hello-shell⁠

There are also images based on Ubuntu, Debian, Google Distroless, Busybox and Scratch to understand that size matters⁠

⁠Versions

This application is available as OCI images⁠ based on Alpine on Docker Hub⁠, which respond to requests with different version numbers:

  • perteghella/hello-shell:1.0
  • perteghella/hello-shell:2.0

The images are based on sample hello-app⁠

⁠Key features

  • Multi architecture build
    • linux/amd64
    • linux/arm64
  • Minimal size due to multistage build⁠
  • Multiple tag to test the migration to different version of deployment
  • Minimal web server that expose version and headers
  • env var PORT to change the server port, default to 8080

⁠How to use this image with Docker cli

Download the proper tagged image docker pull perteghella/hello-shell:TAG

docker pull perteghella/hello-shell:1.0

Run as daemon exposing localhost port 8000 to port 8080 on container

docker run -d -p 8000:8080 --name hello-shell-1.0 perteghella/hello-shell:1.0

Verify that container is running

docker ps

Sample output

CONTAINER ID   IMAGE                           COMMAND        CREATED         STATUS          PORTS                    NAMES
c135f955a4d5   perteghella/hello-shell:1.0     "/hello-app"   1 minutes ago   Up 1 minutes    0.0.0.0:8000->8080/tcp   hello-shell-1.0

Verify that web server is responding to request

curl http://127.0.0.1:8000

Attach to shell using

docker exec -it hello-shell-1.0 /bin/sh

Inside the container execute some linux commands

hostname
ifconfig
ping 1.1.1.1
exit

Stop and destroy the container

docker rm  -f hello-shell-1.0

⁠Code

Source on Github https://github.com/Perteghella/hello-shell⁠

⁠Build the image

Build and push the images based on Alpine to Docker hub

docker buildx build --platform linux/amd64,linux/arm64 --build-arg APP_VERSION=1.0 --tag perteghella/hello-shell:1.0 --push .
docker buildx build --platform linux/amd64,linux/arm64 --build-arg APP_VERSION=2.0 --tag perteghella/hello-shell:2.0 --push .

⁠Build using different base image

Using different Dockerfiles we build and save the image locally

docker buildx build --build-arg APP_VERSION=1.0-scratch -f Dockerfile-scratch --tag perteghella/hello-shell:1.0-scratch  --load .
docker buildx build --build-arg APP_VERSION=1.0-busybox -f Dockerfile-busybox --tag perteghella/hello-shell:1.0-busybox  --load .
docker buildx build --build-arg APP_VERSION=1.0-alpine -f Dockerfile --tag perteghella/hello-shell:1.0-alpine  --load .
docker buildx build --build-arg APP_VERSION=1.0-debian -f Dockerfile-debian --tag perteghella/hello-shell:1.0-debian  --load .
docker buildx build --build-arg APP_VERSION=1.0-ubuntu -f Dockerfile-ubuntu --tag perteghella/hello-shell:1.0-ubuntu  --load .
docker buildx build --build-arg APP_VERSION=1.0-distroless-debian12 -f Dockerfile-distroless-debian12 --tag perteghella/hello-shell:1.0-distroless-debian12  --load .

Get the images sizes

docker image ls

Look the size of the images based on alpine, busybox and scratch + a shell

REPOSITORY                    TAG                IMAGE ID       CREATED              SIZE
gcr.io/distroless/static-debian12   latest       125bac032e5e   N/A                  1.99MB
busybox                       1.37.0             63cd0d5fb10d   5 days ago           4.04MB
alpine                        3.20.3             c157a85ed455   3 weeks ago          8.83MB
ubuntu                        24.04              c22ec0081bf1   2 weeks ago          101MB
debian                        bookworm           a2a098df5635   5 days ago           139MB
redhat/ubi9                   9.4                34c69b3786d8   13 days ago          231MB
perteghella/hello-shell       1.0-scratch        dcd6ba149a7d   1 minutes ago        9.45MB
perteghella/hello-shell       1.0-distroless-debian12  b3312b39c788  4 seconds ago   10.3MB
perteghella/hello-shell       1.0-busybox        f941dd6ac2cf   1 minutes ago        11.3MB
perteghella/hello-shell       1.0-alpine         1df31cf51d68   1 minutes ago        16MB
perteghella/hello-shell       1.0-ubuntu         1c2a0f395005   7 seconds ago        108MB
perteghella/hello-shell       1.0-debian         d2309d0c3760   51 seconds ago       146MB
perteghella/hello-shell       1.0-rh9            d9565b5ac8b8   10 seconds ago       238MB

⁠Build and push the images based on Scratch, Busybox, Ubuntu and Debian

As reference you can use also this TAGs for the image from Docker Hub, sorted by image size.

  • perteghella/hello-shell:1.0-scratch
  • perteghella/hello-shell:1.0-distroless-debian12
  • perteghella/hello-shell:1.0-busybox
  • perteghella/hello-shell:1.0-alpine
  • perteghella/hello-shell:1.0-debian
  • perteghella/hello-shell:1.0-ubuntu
  • perteghella/hello-shell:1.0-rh9

THe images are built with this commands

docker buildx build --platform linux/amd64,linux/arm64 --build-arg APP_VERSION=1.0-scratch -f Dockerfile-scratch --tag perteghella/hello-shell:1.0-scratch --push .
docker buildx build --platform linux/amd64,linux/arm64 --build-arg APP_VERSION=1.0-distroless-debian12 -f Dockerfile-scratch --tag perteghella/hello-shell:1.0-distroless-debian12 --push .
docker buildx build --platform linux/amd64,linux/arm64 --build-arg APP_VERSION=1.0-busybox -f Dockerfile-busybox --tag perteghella/hello-shell:1.0-busybox --push .
docker buildx build --platform linux/amd64,linux/arm64 --build-arg APP_VERSION=1.0-busybox -f Dockerfile --tag perteghella/hello-shell:1.0-alpine --push .
docker buildx build --platform linux/amd64,linux/arm64 --build-arg APP_VERSION=1.0-debian -f Dockerfile-debian --tag perteghella/hello-shell:1.0-debian --push .
docker buildx build --platform linux/amd64,linux/arm64 --build-arg APP_VERSION=1.0-ubuntu -f Dockerfile-ubuntu --tag perteghella/hello-shell:1.0-ubuntu --push .
docker buildx build --platform linux/amd64,linux/arm64 --build-arg APP_VERSION=1.0-rh9 -f Dockerfile-rh9 --tag perteghella/hello-shell:1.0-rh9 --push .

Tag summary

Content type

Image

Digest

sha256:d2ba27ba3…

Size

5.3 MB

Last updated

about 2 years ago

docker pull perteghella/hello-shell:1.0-distroless-debian12