https://github.com/adamdawi/lab5-docker
A Dockerfile using multi-stage builds to create a simple web app with a scratch base image and Nginx, displaying server IP, hostname, and app version. Includes health check and versioning.
https://github.com/adamdawi/lab5-docker
docker healthcheck multi-stage-build nginx versioning web-application
Last synced: about 1 year ago
JSON representation
A Dockerfile using multi-stage builds to create a simple web app with a scratch base image and Nginx, displaying server IP, hostname, and app version. Includes health check and versioning.
- Host: GitHub
- URL: https://github.com/adamdawi/lab5-docker
- Owner: AdamDawi
- Created: 2025-03-25T12:28:30.000Z (over 1 year ago)
- Default Branch: main
- Last Pushed: 2025-04-08T19:09:02.000Z (about 1 year ago)
- Last Synced: 2025-04-08T20:23:36.241Z (about 1 year ago)
- Topics: docker, healthcheck, multi-stage-build, nginx, versioning, web-application
- Language: JavaScript
- Homepage:
- Size: 3.6 MB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# Lab 5 — Docker
[🇬🇧 English](#english-version) | [🇵🇱 Polski](#wersja-polska)
---
## English version
### Stage One in Dockerfile (stage 1)
### Creating `Dockerfile_stage_1`:
1. Copying `package.json` before the application code (`index.js`):
- Docker caches the `RUN npm install` layer if `package.json` remains unchanged.
- This means that if only `index.js` is modified, re-installing dependencies is not required, significantly speeding up the build process.
- Each `RUN` and `COPY` instruction creates a new layer – using two separate `COPY` instructions (first for `package.json`, then for the application code) increases the number of layers but allows better caching, which speeds up future builds. It's a trade-off between optimization and flexibility.
#### Command to build the image:
```bash
docker build --build-arg VERSION=1.0.1 -f Dockerfile_stage_1 -t task_1 .
```
#### Output of the build command:
```
[+] Building 1.9s (10/10) FINISHED
[...output truncated for brevity...]
```
#### Command to run the container:
```bash
docker run -d --rm --name task_1_test -p 8080:8080 task_1
```
#### Output of the run command:
```
c40a3b6b0564bce7b409836767d4462fad7cbb4749810869352a50bbda2000d3
```
#### Command to display running containers:
```bash
docker ps
```
#### Output of the ps command:
```
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
c40a3b6b0564 task_1 "npm start" About a minute ago Up About a minute 0.0.0.0:8080->8080/tcp task_1_test
```
#### Screenshot showing the running web app:
---
### Stage Two in Dockerfile (stage 1 and 2)
#### Command to build the image:
```bash
docker build --build-arg VERSION=1.0.1 -f Dockerfile_stage_1_and_2 -t task_2 .
```
#### Output of the build command:
```
[+] Building 8.2s (16/16) FINISHED
[...output truncated for brevity...]
```
#### Command to run the container:
```bash
docker run -d --rm --name task_2_test -p 80:80 task_2
```
#### Output of the run command:
```
f8edb21b1cd622fc36137e8169fa60eabfca003f0003072fea4a2b063f8e9638
```
#### Command to display running containers:
```bash
docker ps
```
#### Output of the ps command:
```
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
f8edb21b1cd6 task_2 "/docker-entrypoint.…" 46 seconds ago Up 46 seconds (healthy) 0.0.0.0:80->80/tcp, 8080/tcp task_2_test
```
#### Screenshot showing the running web app:
## Wersja polska
### Etap pierwszy w pliku Dockerfile (stage 1)
#### Tworzenie pliku Dockerfile_stage_1:
1. Kopiowanie package.json przed kodem aplikacji (index.js)
- Docker buforuje warstwę RUN npm install, jeśli package.json pozostaje bez zmian.
- Dzięki temu, jeśli zostanie zmodyfikowany tylko index.js, ponowna instalacja zależności nie będzie konieczna, co znacząco przyspieszy budowanie obrazu.
- Każda instrukcja RUN i COPY tworzy nową warstwę – użycie dwóch oddzielnych COPY (najpierw package.json, potem kod aplikacji) zwiększa liczbę warstw, ale pozwala na lepsze wykorzystanie cache, co przyspiesza kolejne budowy obrazu. To kompromis między optymalizacją a elastycznością.
#### Polecenie do zbudowania obrazu:
```bash
docker build --build-arg VERSION=1.0.1 -f Dockerfile_stage_1 -t zadanie_1 .
```
#### Wynik działania polecenia build:
```
[+] Building 1.9s (10/10) FINISHED docker:desktop-linux
=> [internal] load build definition from Dockerfile_stage_1 0.0s
=> => transferring dockerfile: 638B 0.0s
=> [internal] load .dockerignore 0.0s
=> => transferring context: 671B 0.0s
=> [internal] load build context 0.0s
=> => transferring context: 1.92kB 0.0s
=> CACHED [1/6] ADD alpine-minirootfs-3.21.3-aarch64.tar / 0.0s
=> CACHED [2/6] WORKDIR /usr/app 0.0s
=> CACHED [3/6] RUN apk add --no-cache nodejs npm 0.0s
=> CACHED [4/6] COPY ./package.json ./ 0.0s
=> CACHED [5/6] RUN npm install 0.0s
=> [6/6] COPY ./index.js ./ 0.1s
=> exporting to image 1.6s
=> => exporting layers 0.1s
=> => exporting manifest sha256:126ffebcfb420ff9c8d86bc6585424c1fdf2de569eeb28689a58baff9f94ea61 0.0s
=> => exporting config sha256:fd6548265e0357c88f11aeda64cfaf87f73c0bdd7412e871d8117b5caf0e6672 0.0s
=> => exporting attestation manifest sha256:965a2e424a47df2642ee8ef4304237b9e59d2b745927db942af8c8cc2db0613b 0.0s
=> => exporting manifest list sha256:503ef94b2b6568f04ed942ced269b125609fa7e0f7059667e68c2649a6709ddf 0.0s
=> => naming to docker.io/library/zadanie_1:latest 0.0s
=> => unpacking to docker.io/library/zadanie_1:latest 1.3s
View build details: docker-desktop://dashboard/build/desktop-linux/desktop-linux/vif5ezpwmclv5nqj2xj00egjp
```
#### Polecenie do uruchomienia kontenera:
```bash
docker run -d --rm --name zadanie_1_test -p 8080:8080 zadanie_1
```
#### Wynik działania polecenia run:
```
c40a3b6b0564bce7b409836767d4462fad7cbb4749810869352a50bbda2000d3
```
#### Polecenie do wyświetlenia uruchomionych kontenerów:
```bash
docker ps
```
#### Wynik działania polecenia ps:
```
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
c40a3b6b0564 zadanie_1 "npm start" About a minute ago Up About a minute 0.0.0.0:8080->8080/tcp zadanie_1_test
```
#### Zdjęcie pokazujące działanie aplikacji webowej:
### Etap drugi w pliku Dockerfile (stage 1 i 2)
#### Polecenie do zbudowania obrazu:
```bash
docker build --build-arg VERSION=1.0.1 -f Dockerfile_stage_1_and_2 -t zadanie_2 .
```
#### Wynik działania polecenia build:
```
[+] Building 8.2s (16/16) FINISHED docker:desktop-linux
=> [internal] load build definition from Dockerfile_stage_1_and_2 0.0s
=> => transferring dockerfile: 1.24kB 0.0s
=> [internal] load metadata for docker.io/library/nginx:latest 0.0s
=> [internal] load .dockerignore 0.0s
=> => transferring context: 671B 0.0s
=> [internal] load build context 0.0s
=> => transferring context: 151B 0.0s
=> [stage-1 1/5] FROM docker.io/library/nginx:latest@sha256:124b44bfc9ccd1f3cedf4b592d4d1e8bddb78b51ec2ed5056c52d3692baebc19 0.0s
=> => resolve docker.io/library/nginx:latest@sha256:124b44bfc9ccd1f3cedf4b592d4d1e8bddb78b51ec2ed5056c52d3692baebc19 0.0s
=> CACHED [stage-1 2/5] RUN apt update && apt install -y curl nodejs npm 0.0s
=> CACHED [stage-1 3/5] WORKDIR /usr/app 0.0s
=> CACHED [build-stage 1/6] ADD alpine-minirootfs-3.21.3-aarch64.tar / 0.0s
=> CACHED [build-stage 2/6] WORKDIR /usr/app 0.0s
=> CACHED [build-stage 3/6] RUN apk add --no-cache nodejs npm 0.0s
=> CACHED [build-stage 4/6] COPY ./package.json ./ 0.0s
=> CACHED [build-stage 5/6] RUN npm install 0.0s
=> CACHED [build-stage 6/6] COPY ./index.js ./ 0.0s
=> CACHED [stage-1 4/5] COPY --from=build-stage /usr/app /usr/app 0.0s
=> CACHED [stage-1 5/5] COPY default.conf /etc/nginx/conf.d/default.conf 0.0s
=> exporting to image 8.0s
=> => exporting layers 0.0s
=> => exporting manifest sha256:7a11ded8b717a99e800efe7a50e959eea4a5956696b10a745d590a628572bf6a 0.0s
=> => exporting config sha256:7dfe85cce9393b68c77f297c43cd0c60d3a2250f19ddce2aa5a502f78ef68f53 0.0s
=> => exporting attestation manifest sha256:2143cad27cac540d7f839e8c582b9630b5af246f0a71ddee3fe2487d4347d633 0.0s
=> => exporting manifest list sha256:1da4637486e3023ed226c7462a3340c1fe43442cd2c9ca17fc9a815e63c38f00 0.0s
=> => naming to docker.io/library/zadanie_2:latest 0.0s
=> => unpacking to docker.io/library/zadanie_2:latest 7.9s
View build details: docker-desktop://dashboard/build/desktop-linux/desktop-linux/g8q78wfz3ny7a0rjxu0puqpj8
```
#### Polecenie do uruchomienia kontenera:
```bash
docker run -d --rm --name zadanie_2_test -p 80:80 zadanie_2
```
#### Wynik działania polecenia run:
```
f8edb21b1cd622fc36137e8169fa60eabfca003f0003072fea4a2b063f8e9638
```
#### Polecenie do wyświetlenia uruchomionych kontenerów:
```bash
docker ps
```
#### Wynik działania polecenia ps:
```
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
f8edb21b1cd6 zadanie_2 "/docker-entrypoint.…" 46 seconds ago Up 46 seconds (healthy) 0.0.0.0:80->80/tcp, 8080/tcp zadanie_2_test
```
#### Zdjęcie pokazujące działanie aplikacji webowej:
