# Docker

* [Docker](#docker)
  * [what is it?](#what-is-it)
  * [Containers](#containers)
  * [Pushing image to repository](#pushing-image-to-repository)
    * [Pushing image to docker repo](#pushing-image-to-docker-repo)
    * [Pushing image to some other repository](#pushing-image-to-some-other-repository)
  * [other](#other)
  * [Java api](#java-api)
  * [Fabric8](#fabric8)
  * [Dockerfile](#dockerfile)
  * [Volumes](#volumes)
  * [Deploying](#deploying)
  * [images](#images)
  * [Multistage docker image build](#multistage-docker-image-build)
    * [Fat jars/ layering](#fat-jars-layering)
  * [Performance](#performance)
  * [Docker image size](#docker-image-size)
  * [Disadvantages or not to use](#disadvantages-or-not-to-use)
  * [Links](#links)

## what is it?

* <https://www.docker.com/what-docker>
* <https://www.youtube.com/watch?v=-NzfOhSAZpA>
* <https://www.linkedin.com/pulse/beginner-friendly-intro-containers-vm-docker-preethi-kasireddy/>
* <https://www.marcobehler.com/guides/building-docker-images>

## Containers

* Containers
  * <https://www.docker.com/what-container>
* Virtual machines
* List all existing containers (running and not running).
  * `docker ps -a`
* List all running containers
  * `docker ps`
* Stop a specific container
  * `docker stop [container name]`
* Stop all running containers.
  * `docker stop $(docker ps -a -q)`
* Delete a specific container (only if stopped).
  * `docker rm [container name]`
* Force delete a specific container
  * `docker rm -f [container name]`
* Delete all containers (only if stopped).
  * `docker rm $(docker ps -a -q)`
* Display logs of a container.
  * `docker logs [container name]`

## Pushing image to repository

### Pushing image to docker repo

### Pushing image to some other repository

## other

## Java api

## Fabric8

* <https://www.javacodegeeks.com/2019/02/docker-ise-java-application-maven-plugin.html>

## Dockerfile

## Volumes

## Deploying

* <https://www.javacodegeeks.com/2018/02/docker-java-developers-deploy-docker.html>

## images

* build image
  * `docker build -t <name of image> /{path to dockerfile}`
* run image
  * `docker run --name <alias you choose> -d -p 8080:8080 <name of image>`
    * -p 8080:8080 : This is setting the port to be used in you app and expoing in the docker image. This has to match the port in the dockerfile
    * if the container crashes and you want to exec on to it you can add `tail -f /dev/null`
      * `docker run --name <alias you choose> -d -p 8080:8080 <name of image> tail -f /dev/null`
* Passing arguments
  * <https://forums.docker.com/t/is-it-possible-to-pass-arguments-in-dockerfile/14488/3>
  * <https://vsupalov.com/docker-env-vars/>
* remove images
  * `docker system prune`
  * `docker rmi <image>`
* Delete all existing images
  * `docker image rm $(docker images -a -q)`
* <https://www.digitalocean.com/community/tutorials/how-to-remove-docker-images-containers-and-volumes>

## Multistage docker image build

* <https://dzone.com/articles/multi-stage-docker-image-build-for-java-apps>

### Fat jars/ layering

* <https://phauer.com/2019/no-fat-jar-in-docker-image/>

## Performance

* <https://www.thedevcoach.co.uk/docker-performance-tips-and-tricks/>

## Docker image size

* <https://semaphoreci.com/blog/2018/03/14/docker-image-size.html>

## Disadvantages or not to use

* <https://www.freecodecamp.org/news/7-cases-when-not-to-use-docker/>
  * Do Not Use Docker if You Need to Boost Speed
  * Do Not Use Docker if You Prioritize Security
  * Do Not Use Docker if You Develop a Desktop GUI Application
  * Do Not Use Docker if You Want to Light Up Development and Debugging
  * Do Not Use Docker if You Need to Use Different Operating Systems or Kernels
  * Do Not Use Docker if You Have a Lot of Valuable Data to Store
  * Do Not Use Docker if You Are Looking for The Easiest Technology to Manage

## Links

* <https://docs.docker.com/>
* <https://github.com/wsargent/docker-cheat-sheet>
* <https://docker-curriculum.com/>
* <https://www.tutorialspoint.com/docker/index.htm>
* <https://github.com/LeCoupa/awesome-cheatsheets/blob/master/tools/docker.sh>
* <https://github.com/Albertoimpl/k8s-for-the-busy/blob/master/containerizing-java/README.adoc>
* <https://www.freecodecamp.org/news/a-beginners-guide-to-docker-how-to-create-your-first-docker-application-cc03de9b639f/>
* <https://www.freecodecamp.org/news/a-practical-guide-to-containers-dfa66d37ac30/?source=rss----336d898217ee---4>