Docker workshop
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Docker allows for isolation of applications into lightweight containers that can be linked together and share resources. Containers are run from images that act as templates containing the files, configuration, and dependencies for an application. Images are built from Dockerfiles that define the build process and layers, and can be pulled from or pushed to a registry for distribution. Docker uses a client-server model with daemons managing containers on each host.
![EXPOSE VS PUBLISH
A port is exposed by the image itself
Publishing it makes it accessible to the bridge network (possible conflicts)
You can map ports: [host port]:[container port]](https://image.slidesharecdn.com/dockerworkshop-180503142741/85/Docker-workshop-14-320.jpg)
Docker workshop
- 2. CONTAINERS "Just" processes, connected through the network Your application MySQL Varnish Memcache Redis HAProxy
- 4. DOCKER A set of CLI scripts docker build docker run docker volume docker network ...
- 5. localhost DOCKER A daemon and a client Docker daemon client container container container
- 6. some-other-machine DOCKER A daemon and a client Docker daemon client container container container
- 8. IMAGES Pull or build Image registry image Docker- file image pull from use to build
- 10. IMAGE REGISTRY Push your own images Image registry push to Docker- file image use to build
- 12. CONTAINERS Configured through Build process Environment variables Volume mounts
- 13. ASSIGNMENTS/ ALL.MD Playing with docker and Dockerfiles https://github.com/matthiasnoback/docker-workshop/
- 14. EXPOSE VS PUBLISH A port is exposed by the image itself Publishing it makes it accessible to the bridge network (possible conflicts) You can map ports: [host port]:[container port]
- 15. DOCKERFILE Describes the build process of a container image FROM php:7.1-apache COPY web/ /var/www/html/ RUN pecl install redis RUN docker-php-ext-enable redis Cached filesystem layers!
- 16. DOCKERFILE Optimized build FROM php:7.1-apache RUN pecl install redis docker-php-ext-enable redis COPY web/ /var/www/html/
- 17. BUILD CONTEXT Files available while building the image COPY web/ /var/www/html/
- 18. LOGGING To stdout/stderr No file rotation needed You could look into logspout/Logstash/Kibana There are also nice services for this
- 19. COPYING VS VOLUME MOUNTING When to use what Mount a volume while developing Use COPY for creating the build artifact
- 20. READ-ONLY LAYERS With a writeable layer on top Stateful vs immutable
- 21. IMMUTABLE FILE SYSTEMS How to store data on disk? bind-mount volume named volume ("volumes from") fast/cache volume: tmpfs
- 22. CONTAINERS Advantages Self-contained ;) Designed to be immutable (and predictable) Infrastructure as code Configuration has not been abstracted Provisioning new servers is easy