153 lines
2.5 KiB
Markdown
153 lines
2.5 KiB
Markdown
# Vortrags-Script: Docker Compose Basics
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## Einführung Docker Compose
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### Zweck und Vorteile
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- **Definition**: Tool zur Verwaltung mehrerer Container als Anwendung
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- **Installation prüfen**:
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```bash
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docker-compose --version
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```
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### YAML-Syntax
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```yaml
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version: '3'
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services:
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web:
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image: nginx
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ports:
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- "8080:80"
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db:
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image: mysql:8.0
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environment:
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MYSQL_ROOT_PASSWORD: secret
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```
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### Grundbefehle
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```bash
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docker-compose up
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docker-compose up -d
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docker-compose down
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docker-compose ps
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docker-compose logs
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docker-compose logs -f web
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```
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## Mehrcontainer-Anwendungen
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### Service-Abhängigkeiten
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```yaml
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services:
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web:
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depends_on:
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- db
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```
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```bash
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docker-compose up -d db
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docker-compose up -d web
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```
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### Umgebungsvariablen
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```bash
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echo "DB_PASSWORD=secret" > .env
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docker-compose up -d
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```
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## Schaubild Docker-Netzwerke
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### Netzwerke zwischen Containern
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```bash
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docker-compose exec web ping db
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docker network ls
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docker network inspect <project_name>_default
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```
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## Docker Compose in Entwicklung
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### Hot-Reloading
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```bash
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docker-compose exec web ls -la /var/www/html
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# Änderung an lokaler Datei vornehmen
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docker-compose exec web cat /var/www/html/index.php
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```
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### Debugging
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```bash
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docker-compose logs -f
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docker-compose exec web bash
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docker-compose exec -T web php -v
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```
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### Ressourcenkontrolle
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```bash
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docker stats $(docker-compose ps -q)
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```
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## Zusammenfassung und Beispiel
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### Komplettes Beispiel: LAMP-Stack
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```yaml
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version: '3'
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services:
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web:
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build: ./php
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ports:
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- "8000:80"
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volumes:
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- ./src:/var/www/html
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depends_on:
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- db
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environment:
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DB_HOST: db
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DB_USER: app
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DB_PASSWORD: secret
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DB_NAME: myapp
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db:
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image: mysql:8.0
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volumes:
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- db-data:/var/lib/mysql
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environment:
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MYSQL_ROOT_PASSWORD: rootsecret
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MYSQL_DATABASE: myapp
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MYSQL_USER: app
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MYSQL_PASSWORD: secret
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phpmyadmin:
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image: phpmyadmin/phpmyadmin
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ports:
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- "8080:80"
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environment:
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PMA_HOST: db
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depends_on:
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- db
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volumes:
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db-data:
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```
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### Praktische Befehle
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```bash
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# Alle Container starten
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docker-compose up -d
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# Status prüfen
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docker-compose ps
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# Service neu erstellen und starten
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docker-compose up -d --force-recreate web
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# Logs überwachen
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docker-compose logs -f
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# Alles herunterfahren und aufräumen
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docker-compose down -v --remove-orphans
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# Neu bauen und starten
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docker-compose build --no-cache
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docker-compose up -d
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```
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