# Episode 001: Docker

- Hosted by @shashanktomar
- Recording date: TODO

## Video Checkpoints

TODO

## Agenda

- [ ] Introduction, Inspiration, Format and Audience
- about me, about Fabric and who is this for?
- [tgik](tgik.io)
- the structure of the session
- who is this for?
- about potential stream issues
- [ ] Why do you need docker and what it is?

- [Docker vs VM](./images/containers-vs-lxc-vs-vm.jpg)
- build once and run anywhere (★)
- bring actual runtime closer to developers (★★)
- abstraction creates innovation (★★★)

- [ ] Image vs container
- [ ] Let's get started
- `docker version`
- `docker info`
- `docker help`
- [ ] Start a container and play around with it
- run few containers
- cleanup and `--rm`
- detach mode `-d`
- `attach`
- expose port `-p` and `-P`
- interactive `-it`
- environment variable `-e`
- `exec`
- other Commands
- working dir `-w` or `WORKDIR`
- user `-u` or `USER`
- `cp`
- walk through `docker run --help`
- walk through `docker --help`
- [ ] Health Checks
- ```
docker run --name=hc -d --rm \
--health-cmd='stat /etc/passwd || exit 1' \
--health-interval=2s \
busybox sleep 1d

  - `watch -t "docker inspect hc | jq '.[0].State.Health.Status'"`
  - `docker exec hc rm /etc/passwd`
  - `docker exec hc touch /etc/passwd`
- [ ] Image Basics

  - let's build few images
    - noose
    - goose
  - image commands
    - walkthrough
    - `ADD` vs `COPY`
    - `ENTRYPOINT` vs `CMD`
  - buildkit
  - best practices
    - create ephemeral containers
    - understand build context
    - .dockerignore
    - multistage builds
    - keep your images thin
    - decouple applications
    - minimize the number of layers: Only the instructions RUN, COPY, ADD create layers
    - leverage build cache

### If time permits

- [ ] Storage
  - bind mounts vs volumes vs tmpfs
- [ ] Advance Topics

  - commit

    - `docker commit --change "ENV DEBUG true" <container-id> busybox/testimage:v1`
    - `docker commit --change='CMD ["sleep", "10"]' <container-id> busybox/testimage:v2`

  - checkpoints

## Show Notes

### Comments

### Feedback

## Reference Links

- [tgik](tgik.io)
- [Docker reference](https://docs.docker.com/reference/)
- [Dockerfile best practices](https://docs.docker.com/develop/develop-images/dockerfile_best-practices/)
- [Docker Cheatsheet](./docker-cheatsheet.md)
- [Fabric Group](https://fabricgroup.com.au/)