demystifying-docker-previous/slides.md

---
# You can also start simply with 'default'
theme: seriph
# random image from a curated Unsplash collection by Anthony
# like them? see https://unsplash.com/collections/94734566/slidev
background: https://cover.sli.dev
# some information about your slides (markdown enabled)
title: Welcome to Slidev
info: |
  ## Slidev Starter Template
  Presentation slides for developers.

  Learn more at [Sli.dev](https://sli.dev)
# apply unocss classes to the current slide
class: text-center
# https://sli.dev/features/drawing
drawings:
  persist: false
# slide transition: https://sli.dev/guide/animations.html#slide-transitions
transition: slide-left
# enable MDC Syntax: https://sli.dev/features/mdc
mdc: true
# open graph
# seoMeta:
#  ogImage: https://cover.sli.dev
---

# Demystifying Docker

A beginners guide to containerization and beyond

<div @click="$slidev.nav.next" class="mt-12 py-1" hover:bg="white op-10">
  Press Space for next page <carbon:arrow-right />
</div>

<div class="abs-br m-6 text-xl">
  <button @click="$slidev.nav.openInEditor()" title="Open in Editor" class="slidev-icon-btn">
    <carbon:edit />
  </button>
  <a href="https://github.com/slidevjs/slidev" target="_blank" class="slidev-icon-btn">
    <carbon:logo-github />
  </a>
</div>

<!--
The last comment block of each slide will be treated as slide notes. It will be visible and editable in Presenter Mode along with the slide. [Read more in the docs](https://sli.dev/guide/syntax.html#notes)
-->

---
transition: fade-out
---

# Who am I?

Mike Conrad

- 📝 **Text-based** - focus on the content with Markdown, and then style them later
- 🎨 **Themable** - themes can be shared and re-used as npm packages
- 🧑‍💻 **Developer Friendly** - code highlighting, live coding with autocompletion
- 🤹 **Interactive** - embed Vue components to enhance your expressions
- 🎥 **Recording** - built-in recording and camera view
- 📤 **Portable** - export to PDF, PPTX, PNGs, or even a hostable SPA
- 🛠 **Hackable** - virtually anything that's possible on a webpage is possible in Slidev
<br>
<br>

Read more about [Why Slidev?](https://sli.dev/guide/why)

<!--
You can have `style` tag in markdown to override the style for the current page.
Learn more: https://sli.dev/features/slide-scope-style
-->

<style>
h1 {
  background-color: #2B90B6;
  background-image: linear-gradient(45deg, #4EC5D4 10%, #146b8c 20%);
  background-size: 100%;
  -webkit-background-clip: text;
  -moz-background-clip: text;
  -webkit-text-fill-color: transparent;
  -moz-text-fill-color: transparent;
}
</style>

<!--
Here is another comment.
-->

---
transition: slide-up
layout: quote
level: 2
---

# What is a container?

> A method for packaging and securely running an application within an application virtualization environment. Also known as an application container or a server application container. [NIST](https://csrc.nist.gov/glossary/term/container)

<p style="background:white;height:20px;"></p>

> A container is a standard unit of software that packages up code and all its dependencies so the application runs quickly and reliably from one computing environment to another. A Docker container image is a lightweight, standalone, executable package of software that includes everything needed to run an application: code, runtime, system tools, system libraries and settings. [Docker](https://www.docker.com/resources/what-container/)

---
layout: two-cols
layoutClass: gap-16
---

# Problems?

- 📝 **It works on my machine?!?!** - Code behaves differently in dev, testing, and production due to differences in environment (OS, dependencies, configurations).
- 🎨 **Dependency conflicts** - Different applications require conflicting versions of the same dependency (e.g., Python 2 vs 3, different Node versions).
- 🧑‍💻 **Slow and error-prone deployments** - Traditional deployments involve manual steps or configuration drift between environments.

::right::
# Solutions

- Containers package the application and its dependencies in a consistent, isolated environment, ensuring it behaves the same everywhere.
- Containers isolate applications and their dependencies from each other and the host system, preventing conflicts.
- Containers provide predictable, repeatable, and scriptable deployments through container images.
---
transition: slide-right
layout: two-cols
layoutClass: gap-16
---

# Problems?

- 📝 **Inefficient resource usage in virtual machines (VMs)** - VMs have high overhead due to running full operating systems, leading to inefficiency.
- 🎨 **Difficult scalability and orchestration** - Scaling applications manually is hard and error-prone.
- 🧑‍💻 **Inconsistent development workflows** - devs all have different setups, leading to inconsistent builds and bugs.

::right::
# Solutions

- Containers share the host OS kernel and are more lightweight, enabling faster startup and denser packing of applications.
- Containers integrate well with orchestrators (like Kubernetes), enabling automated scaling, rolling updates, and fault tolerance.
- Containers standardize development environments using tools like Docker Compose or dev containers.


---
transition: fade-out
layout: two-cols-header
title: Differences between VM and Container?
---

# Differences between VM and Containers?

::left::
## Virtual Machine
- Virtualizes hardware
- Runs a full guest OS (e.g., Linux or Windows)
- Heavier: includes the OS, libraries, and application
- Slow to start, uses more resources

**Example**: Running Ubuntu with Apache inside a VM on a Windows host

::right:: 

## Container
- Virtualizes at the OS level
- Shares the host OS kernel
- Isolates *only the application and its dependencies*
- Lightweight: faster startup, lower resource use

**Example:** Running a Node.js app in a container using the host's Linux kernel


---
transition: fade-out
---

# How do they work?


## Containers are just processes

If you don't take anything else away from this talk, I hope you walk away with a better understanding of this fundamental.  As far as the OS is concerned, a container is just another process/set of processes to the operating system.
---