Add whalesay

2 files changed, 419 insertions, 299 deletions

diff --git a/README.md b/README.md
index 9b68805..6d2f360 100644
--- a/README.md
+++ b/README.md
@@ -43,17 +43,115 @@ Mo Khan | Software Developer | Calgary, AB, Canada.
 
 # License scanning at GitLab
 
-As a compliance officer,
-I want a list of all the software licenses
-so that we don't get into legal trouble.
+```plaintext
+       ***********************
+       < Show me the licenses >
+       ***********************
+              \
+               \
+                \
+                              ##        .
+                        ## ## ##       ==
+                    ## ## ## ##      ===
+                /""""""""""""""""___/ ===
+           ~~~ {~~ ~~~~ ~~~ ~~~~ ~~ ~ /  ===- ~~~
+                \______ o          __/
+                  \    \        __/
+                    \____\______/
+
+```
 
 | Name  | Version | Package Manager | License |
 | ----- | ----- | --- | --- |
+| @rails/actioncable | 6.0.3-3 | Yarn | MIT |
+| @rails/ujs | 6.0.3-2 | Yarn | MIT |
+| @yarnpkg/lockfile | 1.1.0 | Yarn | BSD-2-Clause |
+| addressable | 2.7.0 | Bundler | Apache-2.0 |
+| bcrypt | 3.1.12 | Bundler | MIT |
+| cbor | 0.5.9.6 | Bundler | Apache-2.0 |
+| device_detector | 1.0.0 | Bundler | LGPL-3.0 |
+| devise | 4.7.3 | Bundler | MIT |
+| diffy | 3.3.0 | Bundler | MIT |
+| docutils | 0.13.1 | Pipenv | BSD-2-Clause |
+| elasticsearch | 6.8.2 | Bundler | Apache-2.0 |
+| eventmachine | 1.2.7 | Bundler | Ruby AND GPL-2.0 |
+| ffi | 1.13.1 | Bundler | BSD-3-Clause |
+| ffi-compiler | 1.0.1 | Bundler | Apache-2.0 |
+| jmespath | 1.4.0 | Bundler | Apache-2.0 |
+| kgio | 2.11.3 | Bundler | LGPL-2.1+ |
+| launchy | 2.4.3 | Bundler | ISC |
+| msgpack | 1.3.3 | Bundler | Apache-2.0 |
+| nokogumbo | 2.0.2 | Bundler | Apache-2.0 |
 | rails | 6.0.3.3 | Bundler | MIT |
 | vue | 2.6.12 | Yarn | MIT |
-| docutils | 0.13.1 | Pipenv | BSD-2-Clause |
 
-# How?
+# Constraints
+
+* supports multiple versions of:
+  * Dotnet Core
+  * Golang
+  * Java
+  * NodeJS
+  * PHP
+  * Python
+  * Ruby
+* supports multiple package managers:
+  * Bundler
+  * pip
+  * Pipenv
+  * Gradle
+  * Maven
+* includes system packages for common libraries:
+  * libpq-dev
+  * libsqlite3-dev
+* works in limited connectivity environments
+
+```plaintext
+       **************************************
+       < Must be deployed as a Docker image >
+       **************************************
+            \
+             \
+              \
+                            ##        .
+                      ## ## ##       ==
+                  ## ## ## ##      ===
+              /""""""""""""""""___/ ===
+         ~~~ {~~ ~~~~ ~~~ ~~~~ ~~ ~ /  ===- ~~~
+              \______ o          __/
+                \    \        __/
+                  \____\______/
+
+```
+
+
+# Constraints - 🤔
+
+We need to build a Docker image that can:
+
+* scan any codebase
+* install the version of tools needed
+* install the project dependencies
+* be small enough to fit on a CD-ROM
+
+```plaintext
+                      ---------------
+                    < Are you joking? >
+                      ---------------
+
+          .---.
+         /o   o\
+      __(=  "  =)__
+       //\'-=-'/\\
+          )   (_
+         /      `"=-._
+        /       \     ``"=.
+       /  /   \  \         `=..--.
+   ___/  /     \  \___      _,  , `\
+  `-----' `""""`'-----``"""`  \  \_/
+```
+
+# How does this work?
 
 ```text
   -------------
@@ -61,63 +159,31 @@ so that we don't get into legal trouble.
   -------------     ----------------
   | main*     | --> | gitlab-runner |
   | feature-a |     ----------------
-  | feature-b |           |
+  | feature-b |            |
   -------------     launch container
-                          |
-                          V
+                           |
+                           V
                     ---------------
-                    |             | <----- 10GB ------
+                    |             | <-----------------
                     | Docker Host | ---------        |
                     |             |         |        |
                     ---------------         |        |
-                          |              download    |
-                          V                 |        |
-                    ⭐⭐⭐⭐⭐⭐⭐          |        |
-                    ⭐ License  ⭐     ------------  |
-                    ⭐ Scanner  ⭐     | registry | -|
-                    ⭐⭐⭐⭐⭐⭐⭐     ------------
-                          |
-                    publish report
-                          |
-                          V
+                           |             download    |
+                           V                |        |
+                    ⭐⭐⭐⭐⭐⭐⭐⭐        V        |
+                    ⭐  License   ⭐   ------------  |
+                    ⭐  Scanner   ⭐   | registry | -|
+                    ⭐⭐⭐⭐⭐⭐⭐⭐   ------------
+                           |
+                     publish report
+                           |
+                           V
                     ----------------
                     | gitlab-rails |
                     ----------------
 ```
 
-# Constraints
-
-```plaintext
-       --------------------------------------
-       | Must be deployed as a Docker image |
-       --------------------------------------
-```
-
-* Must support multiple versions of:
-  * Dotnet Core
-  * Golang
-  * Java
-  * Mono
-  * NodeJS
-  * PHP
-  * Python
-  * Ruby
-  * Rust
-  * etc
-* Must support multiple package managers:
-  * Bundler
-  * pip
-  * pipenv
-  * gradle
-  * maven
-  * etc
-* Must include system packages for common libraries:
-  * libpq-dev
-  * libsqlite3-dev
-
-       😒 🤔
-
-# How?
+# v1.0
 
 1. Scan project for lock files (Gemfile.lock, Pipfile.lock etc)
 2. Install project tools (Ruby 2.7.2, Python 3.8.4)
@@ -125,43 +191,136 @@ so that we don't get into legal trouble.
 4. Scan for licenses
 5. Export JSON report
 
-# What?
+```plaintext
+                      ************
+                      | APPLAUSE |
+                      ************
+```
+
+| Name  | Version | Package Manager | License |
+| ----- | ----- | --- | --- |
+| @rails/actioncable | 6.0.3-3 | Yarn | MIT |
+| @rails/ujs | 6.0.3-2 | Yarn | MIT |
+| @yarnpkg/lockfile | 1.1.0 | Yarn | BSD-2-Clause |
+| addressable | 2.7.0 | Bundler | Apache-2.0 |
+| bcrypt | 3.1.12 | Bundler | MIT |
+| cbor | 0.5.9.6 | Bundler | Apache-2.0 |
+| device_detector | 1.0.0 | Bundler | LGPL-3.0 |
+
+```plaintext
+                ---------------------------
+              < Yay! We can detect licenses >
+                ---------------------------
+        .---.
+       /o   o\
+    __(=  "  =)__
+     //\'-=-'/\\
+        )   (_
+       /      `"=-._
+      /       \     ``"=.
+     /  /   \  \         `=..--.
+ ___/  /     \  \___      _,  , `\
+`-----' `""""`'-----``"""`  \  \_/
+```
+
+# Why so slow?
 
-Large Docker images
+```plaintext
+ _____________________________________
+< That's cool, but why is it so slow? >
+ -------------------------------------
+    \
+     \
+      \
+                    ##        .
+              ## ## ##       ==
+           ## ## ## ##      ===
+       /""""""""""""""""___/ ===
+  ~~~ {~~ ~~~~ ~~~ ~~~~ ~~ ~ /  ===- ~~~
+       \______ o          __/
+        \    \        __/
+          \____\______/
+```
+
+# Overview
+
+```text
+      ---------------
+      |             | <-----------------
+      | Docker Host | ---------        |
+      |             |         |        |
+      ---------------         |        |
+             |             download    |
+             V                |        |
+      ⭐⭐⭐⭐⭐⭐⭐⭐        V        |
+      ⭐  License   ⭐   ------------  |
+      ⭐  Scanner   ⭐   | registry | -|
+      ⭐⭐⭐⭐⭐⭐⭐⭐   ------------
+             |
+        publish report
+             |
+             V
+      ----------------
+      | gitlab-rails |
+      ----------------
+```
+
+# What happens if the Docker image is too large?
 
 * slow downloads
 * more disk space is required
 * more bandwidth is consumed
 
-# Zoom in
+```plaintext
+                      ---------------
+                    < That's not good >
+                      ---------------
+        .---.
+       /o   o\
+    __(=  "  =)__
+     //\'-=-'/\\
+        )   (_
+       /      `"=-._
+      /       \     ``"=.
+     /  /   \  \         `=..--.
+ ___/  /     \  \___      _,  , `\
+`-----' `""""`'-----``"""`  \  \_/
+```
+
 
-How did you shrink the image from 10GB down to 1GB?
+# Overview
 
 ```text
       ---------------
-      |             | <----- 10GB ------
+      |             | <------ 10GB -----
       | Docker Host | ---------        |
       |             |         |        |
       ---------------         |        |
-            |              download    |
-            V                 |        |
-      --------------          V        |
-      | License    |     ------------  |
-      | scanner    |     | registry | -|
-      --------------     ------------
+             |             download    |
+             V                |        |
+      ⭐⭐⭐⭐⭐⭐⭐⭐        V        |
+      ⭐  License   ⭐   ------------  |
+      ⭐  Scanner   ⭐   | registry | -|
+      ⭐⭐⭐⭐⭐⭐⭐⭐   ------------
 ```
 
-```bash
-        モ ls ~/development/gitlab | grep lock
-        Gemfile.lock
-        Pipfile.lock
-        yarn.lock
-```
+```plaintext
+            --------------------------------------
+          < Yikes! It takes 6 minutes to download >
+            --------------------------------------
 
-Also added
+        .---.
+       /o   o\
+    __(=  "  =)__
+     //\'-=-'/\\
+        )   (_
+       /      `"=-._
+      /       \     ``"=.
+     /  /   \  \         `=..--.
+ ___/  /     \  \___      _,  , `\
+`-----' `""""`'-----``"""`  \  \_/
+```
 
-* Support for more languages and versions.
-* Support for limited connectivity environments.
 
 # Agenda
 
@@ -189,14 +348,10 @@ Also added
 
 # Definitions
 
-* Image
-* Container
-* Registry
-
-# Definitions - Image
-
-A Docker image is similar to a Ruby class.
-A class defines the behaviour and data associated with the class.
+| Ruby | Docker |
+| -- | -- |
+| Class | Image |
+| Object | Container |
 
 ```ruby
 class Person
@@ -210,38 +365,13 @@ class Person
     puts "#{name} 🤗 #{other.name}"
   end
 end
-```
-
-# Definitions
-
-You can't do much with a class until you create
-an instance of one.
-
-```ruby
-                      mo = Person.new("mo")
-                      me = Person.new("me")
-```
-
-# Definitions - Objects
 
-Once a class is instantiated you can invoke
-methods on the object. An object can interact
-with other objects.
+mo = Person.new("mo")
+me = Person.new("me")
 
-```ruby
-                      mo.hugs(me)
+mo.hugs(me)
 ```
 
-# Definitions - Container
-
-A container is a running instance of an image.
-Similar to how an object is an instance of a class.
-
-| Ruby | Docker |
-| -- | -- |
-| Class | Image |
-| Object | Container |
-
 # Definitions - Registry
 
 Registry: stores images and makes them available to others
@@ -253,10 +383,6 @@ For example:
 * https://registry-1.docker.io
 * https://registry.gitlab.com
 
-```bash
-curl -s -i https://registry-1.docker.io/v2/alpine/tags/list
-```
-
 # Architecture
 
 ```text
@@ -299,63 +425,15 @@ docker run -it alpine:latest cat /etc/os-release
 
 # Dockerfile
 
-```file
-path: examples/001/Dockerfile
-relative: true
-lang: docker
-```
-
-https://docs.docker.com/engine/reference/builder/
-
-# FROM alpine:latest
-
-Initializes a build stage and sets a Base Image.
-
-```file
-path: examples/001/Dockerfile
-relative: true
-lang: docker
-```
-
-# COPY "hello.rb"
-
-Copy "hello.rb" from the host to "/usr/local/bin/hello" in the Docker image.
-
-```bash
-$ cat examples/001/hello.rb
-```
-```file
-path: examples/001/hello.rb
-relative: true
-lang: ruby
-```
-
-# Dockerfile - RUN
-
-RUN a command from within the image and make "hello" executable.
+Defines how to build a Docker image.
 
 ```file
 path: examples/001/Dockerfile
 relative: true
 lang: docker
-lines:
-  start: 2
-  end: 3
 ```
 
-# Dockerfile - CMD
-
-Set the default command to run when the docker image
-is launched as a container.
-
-```file
-path: examples/001/Dockerfile
-relative: true
-lang: docker
-lines:
-  start: 3
-  end: 4
-```
+https://docs.docker.com/engine/reference/builder/
 
 # docker build -t developing-with-docker:latest examples/001/
 
@@ -369,86 +447,49 @@ docker build --network=host -t developing-with-docker:latest examples/001/
 docker run developing-with-docker:latest
 ```
 
-# dive
+# Analysis
 
-Useful for identifying bloat.
-https://github.com/wagoodman/dive
+A docker image is made up of multiple layers.
+Each layer is a snapshot of the filesystem
+stored as an archive.
 
-* Displays each layer
-* Allows investigating files that are added/removed/changed in each layer
+```plaintext
+                  --------------
+                < Let's dive in! >
+                  --------------
+        .---.
+       /o   o\
+    __(=  "  =)__
+     //\'-=-'/\\
+        )   (_
+       /      `"=-._
+      /       \     ``"=.
+     /  /   \  \         `=..--.
+ ___/  /     \  \___      _,  , `\
+`-----' `""""`'-----``"""`  \  \_/
+```
+
+# Analysis - dive
 
-# dive original
+```file
+path: examples/001/Dockerfile
+relative: true
+lang: docker
+```
 
 ```bash
-│ Layers ├──────────────────────────────────────────────────────────────────────────── ┃ ● Current Layer Contents ┣━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
-Cmp   Size  Command                                                                    Permission     UID:GID       Size  Filetree
-    5.6 MB  FROM 5a96ef02e9cab83                                                       drwxr-xr-x         0:0     841 kB  ├─⊕ bin
-      40 B  #(nop) COPY file:253d38e67af26b201caf4e271248576ba6a7da0431f5ddee20c5c6df5 drwxr-xr-x         0:0        0 B  ├── dev
-     16 MB  apk add ruby                                                               drwxr-xr-x         0:0     383 kB  ├─⊕ etc
-      40 B  chmod +x /usr/local/bin/hello                                              drwxr-xr-x         0:0        0 B  ├── home
-                                                                                       drwxr-xr-x         0:0     3.9 MB  ├─⊕ lib
-│ Layer Details ├───────────────────────────────────────────────────────────────────── drwxr-xr-x         0:0        0 B  ├─⊕ media
-                                                                                       drwxr-xr-x         0:0        0 B  ├── mnt
-Tags:   (unavailable)                                                                  drwxr-xr-x         0:0        0 B  ├── opt
-Id:     e19b1e8ac9df6c9165f82c5e278f4d8b4839c8e6727001a12477e3947ffd83ea               dr-xr-xr-x         0:0        0 B  ├── proc
-Digest: sha256:aebe0431f34491da1f2785934e4190cfb9fbba01fc1aeff69f13c139a6ccac65        drwx------         0:0        0 B  ├── root
-Command:                                                                               drwxr-xr-x         0:0        0 B  ├── run
-apk add ruby                                                                           drwxr-xr-x         0:0     226 kB  ├─⊕ sbin
-                                                                                       drwxr-xr-x         0:0        0 B  ├── srv
-│ Image Details ├───────────────────────────────────────────────────────────────────── drwxr-xr-x         0:0        0 B  ├── sys
-                                                                                       drwxrwxrwx         0:0        0 B  ├── tmp
-                                                                                       drwxr-xr-x         0:0      14 MB  ├─⊕ usr
-Total Image size: 21 MB                                                                drwxr-xr-x         0:0     1.8 MB  └─⊕ var
-Potential wasted space: 532 kB
-Image efficiency score: 98 %
-
-Count   Total Space  Path
-    2        428 kB  /etc/ssl/certs/ca-certificates.crt
-    2         79 kB  /lib/apk/db/installed
-    2         25 kB  /lib/apk/db/scripts.tar
-    2         288 B  /lib/apk/db/triggers
-    2         123 B  /etc/apk/world
-    2          80 B  /usr/local/bin/hello
-    2           0 B  /lib/apk/db/lock
-    2           0 B  /var/cache/misc
-```
-
-# dive - layers
+$ dive developing-with-docker:latest
 
-```bash
 │ Layers ├─────────────────────────────────────────────────────────
-Cmp   Size  Command
-    5.6 MB  FROM 5a96ef02e9cab83
-      40 B  #(nop) COPY file:253d38e67af26b201caf4e271248576ba6a7da
-     16 MB  apk add ruby
-      40 B  chmod +x /usr/local/bin/hello
-
-│ Layer Details ├──────────────────────────────────────────────────
-
-Tags:   (unavailable)
-Id:     e19b1e8ac9df6c9165f82c5e278f4d8b4839c8e6727001a12477e3947ff
-Digest: sha256:aebe0431f34491da1f2785934e4190cfb9fbba01fc1aeff69f13
-Command:
-apk add ruby
-
-│ Image Details ├──────────────────────────────────────────────────
-
-
-Total Image size: 21 MB
-Potential wasted space: 532 kB
-Image efficiency score: 98 %
-
-Count   Total Space  Path
-    2        428 kB  /etc/ssl/certs/ca-certificates.crt
-    2         79 kB  /lib/apk/db/installed
-    2         25 kB  /lib/apk/db/scripts.tar
-    2         288 B  /lib/apk/db/triggers
-    2         123 B  /etc/apk/world
-    2          80 B  /usr/local/bin/hello
-    2           0 B  /lib/apk/db/lock
-    2           0 B  /var/cache/misc
+Size    Command
+5.6 MB   FROM 5a96ef02e9cab83
+  16 MB  apk add ruby
+  40 B   #(nop) COPY file:253d38e67af26b201caf4e271248576ba6a7da
+  40 B   chmod +x /usr/local/bin/hello
 ```
 
+https://github.com/wagoodman/dive
+
 # dive - layer details
 
 ```bash
@@ -473,10 +514,29 @@ drwxr-xr-x         0:0      14 MB  ├─⊕ usr
 drwxr-xr-x         0:0     1.8 MB  └─⊕ var
 ```
 
-# docker pull - back then
+# License scanner - v1.0
+
+```plaintext
+ __________________________________
+/ How many layers does the license \
+\ scanner image have?              /
+ ----------------------------------
+    \
+     \
+      \
+                    ##        .
+              ## ## ##       ==
+           ## ## ## ##      ===
+       /""""""""""""""""___/ ===
+  ~~~ {~~ ~~~~ ~~~ ~~~~ ~~ ~ /  ===- ~~~
+       \______ o          __/
+        \    \        __/
+          \____\______/
+```
+
+# docker pull - v1.0
 
 ```bash
-2.8.0: Pulling from gitlab-org/security-products/license-management
 0a01a72a686c: Pull complete
 cc899a5544da: Pull complete
 19197c550755: Pull complete
@@ -518,18 +578,77 @@ e17797fa5e82: Waiting
 9003b36c1e4e: Waiting
 ```
 
-# Start with a minimal base image
+# Layer cake
+
+```plaintext
+...
+50d1fb4b55b2: Download complete
+276696690bcf: Download complete
+5eec42d5363b: Download complete
+2296aa2193e9: Download complete
+5fe4c102c0bc: Download complete
+97390612da81: Downloading [=====>                ]  81.05MB/174MB
+311b1e270e29: Downloading [===========>          ]  42.12MB/189.4MB
+53dfbd975f60: Downloading [=>                    ]  25.36MB/843.4MB
+3dd2acdebe0f: Waiting
+d548f098494f: Waiting
+da1cc42017ff: Waiting
+cfc3cd025ca9: Waiting
+69ea647e6c07: Waiting
+1e27d5f85aa2: Waiting
+94cf5e06627d: Waiting
+30e1f788589d: Waiting
+d9238ec317d1: Waiting
+e17797fa5e82: Waiting
+9003b36c1e4e: Waiting
+                _______________________
+                < That's a lot of layers! >
+                -----------------------
+                    \
+                    \
+                      \
+                                    ##        .
+                              ## ## ##       ==
+                          ## ## ## ##      ===
+                      /""""""""""""""""___/ ===
+                 ~~~ {~~ ~~~~ ~~~ ~~~~ ~~ ~ /  ===- ~~~
+                      \______ o          __/
+                        \    \        __/
+                          \____\______/
 
-```Dockerfile
-FROM licensefinder/license_finder:5.6.2
 ```
 
+# Start with a minimal base image
+
 ```bash
 REPOSITORY                   TAG                 SIZE
 debian                       stable-slim         69.2MB
 licensefinder/license_finder 5.6.2               3.63GB
 ```
 
+```plaintext
+                  ------------------------------
+                < Let's try a smaller base image >
+                  ------------------------------
+        .---.
+       /o   o\
+    __(=  "  =)__
+     //\'-=-'/\\
+        )   (_
+       /      `"=-._
+      /       \     ``"=.
+     /  /   \  \         `=..--.
+ ___/  /     \  \___      _,  , `\
+`-----' `""""`'-----``"""`  \  \_/
+                             `-`
+```
+
+```Dockerfile
+FROM licensefinder/license_finder:5.6.2
+```
+
+to
+
 ```Dockerfile
 FROM debian:stable-slim
 ```
@@ -607,7 +726,7 @@ apt-get install -y --no-install-recommends \
 
 # Deflate
 
-Compress directories that are large during build time.
+Compress files that are large during build time.
 
 ```bash
 #!/bin/bash
@@ -633,7 +752,7 @@ deflate /usr/share/dotnet.tar.zst dotnet
 
 # Inflate
 
-Decompress directories when the container is launched
+Decompress files when the container is launched
 by hooking into the ENTRYPOINT.
 
 ```Dockerfile
@@ -675,7 +794,7 @@ build do
     "--disable-jit-support",
     "--enable-shared",
     "--prefix=#{install_dir}",
-    "--with-out-ext=coverage,dbm,readline,rdoc,win32,win32ole,sdbm",
+    "--with-out-ext=coverage,dbm,readline,rdoc,win32,win32ole,...",
     "--without-gdbm",
     "--without-gmp",
     "--without-jemalloc",
@@ -690,72 +809,68 @@ end
 
 ```bash
 # ls -lh /opt/toolcache/ruby-* | awk '{ print $5 " " $9 }'
-5.3M /opt/toolcache/ruby-2.4.10_2.4.10-1_amd64.deb
-5.3M /opt/toolcache/ruby-2.4.5_2.4.5-1_amd64.deb
-5.3M /opt/toolcache/ruby-2.4.9_2.4.9-1_amd64.deb
-5.4M /opt/toolcache/ruby-2.5.8_2.5.8-1_amd64.deb
-5.6M /opt/toolcache/ruby-2.6.0_2.6.0-1_amd64.deb
-5.6M /opt/toolcache/ruby-2.6.1_2.6.1-1_amd64.deb
-5.6M /opt/toolcache/ruby-2.6.2_2.6.2-1_amd64.deb
-5.6M /opt/toolcache/ruby-2.6.3_2.6.3-1_amd64.deb
-5.6M /opt/toolcache/ruby-2.6.4_2.6.4-1_amd64.deb
-5.6M /opt/toolcache/ruby-2.6.5_2.6.5-1_amd64.deb
-5.6M /opt/toolcache/ruby-2.6.6_2.6.6-1_amd64.deb
-5.7M /opt/toolcache/ruby-2.7.0_2.7.0-1_amd64.deb
-5.7M /opt/toolcache/ruby-2.7.1_2.7.1-1_amd64.deb
-5.7M /opt/toolcache/ruby-2.7.2_2.7.2-1_amd64.deb
+5.3M /opt/toolcache/ruby-2.4.10-1_amd64.deb
+5.3M /opt/toolcache/ruby-2.4.5-1_amd64.deb
+5.3M /opt/toolcache/ruby-2.4.9-1_amd64.deb
+5.4M /opt/toolcache/ruby-2.5.8-1_amd64.deb
+5.6M /opt/toolcache/ruby-2.6.0-1_amd64.deb
+5.6M /opt/toolcache/ruby-2.6.1-1_amd64.deb
+5.6M /opt/toolcache/ruby-2.6.2-1_amd64.deb
+5.6M /opt/toolcache/ruby-2.6.3-1_amd64.deb
+5.6M /opt/toolcache/ruby-2.6.4-1_amd64.deb
+5.6M /opt/toolcache/ruby-2.6.5-1_amd64.deb
+5.6M /opt/toolcache/ruby-2.6.6-1_amd64.deb
+5.7M /opt/toolcache/ruby-2.7.0-1_amd64.deb
+5.7M /opt/toolcache/ruby-2.7.1-1_amd64.deb
+5.7M /opt/toolcache/ruby-2.7.2-1_amd64.deb
 ```
 
 # Results
 
-```bash
-REPOSITORY                 TAG                 SIZE
-analyzers/license-finder   3.28.1              1.4GB
-analyzers/license-finder   2.8.0               9.83GB
-analyzers/license-finder   1.5.0               4.06GB
+| Image  | Tag | Size |
+| ----- | ----- | --- |
+| license-scanner | 3.28.1 | 1.4GB  |
+| license-scanner | 2.8.0 | **9.83GB** |
+| license-scanner | 1.5.0 | 4.06GB |
+
+```plaintext
+                  ------------
+                < 9.83GB to 1.4GB. Better! >
+                  ------------
+        .---.
+       /o   o\
+    __(=  "  =)__
+     //\'-=-'/\\
+        )   (_
+       /      `"=-._
+      /       \     ``"=.
+     /  /   \  \         `=..--.
+ ___/  /     \  \___      _,  , `\
+`-----' `""""`'-----``"""`  \  \_/
 ```
 
 # Summary
 
 * Keep each layer small
-* More layers provides opportunity for more parallel downloads
-* Download will block on the largest layer.
-* Too many layers can cause too many parallel downloads
-* Try to collapse layers by grouping logical things together
-* Cleanup unnecessary artifacts in each layer
-* Deflate files when building layers
-* Inflate files when container is launched
+* Grouping install steps together
+* Cleanup transient artifacts in each layer
+* Deflate files at building time
+* Inflate files at run time
 
-Thank you
+```plaintext
+                  ----------
+                < Thank you >
+                  ----------
+        .---.
+       /o   o\
+    __(=  "  =)__
+     //\'-=-'/\\
+        )   (_
+       /      `"=-._
+      /       \     ``"=.
+     /  /   \  \         `=..--.
+ ___/  /     \  \___      _,  , `\
+`-----' `""""`'-----``"""`  \  \_/
+```
 
 [gitlab.com/xlgmokha/developing-with-docker](https://gitlab.com/xlgmokha/developing-with-docker)
-
-# Feedback
-
-* people will know what Docker is
-* watch the screen from different sizes
-  * increase size and not make it black background. hard to see.
-  * white background
-* Take into account:
-  * Not native English speakers
-    * Don't use fancy English words
-  * Talk slower: adjust talking speed based on the audience.
-* What is the story?
-  * Explain the problem and context of the situation and why are we interested in layers and this talk.
-    * Why should I watch this talk?
-    * Visitors may not be engaged so do something to promote and get people interested in what you will share.
-    * explain why we had this problem and explain how the scanner works in the context of a CI build.
-  * What is the problem that this person is solving?
-* Mostly Ruby On Rails focused audience there are some devops interested people.
-  * Some people are interested in learning how to shrink Docker images and this can be useful to people.
-* I want you to learn about:
-  * zstandard
-  * debian/rpm/apk packaging  (omnibus)
-
-Best talk:
-
-* Idea
-* drop everything that does not support this idea around this talk.
-* Pattern: humans get bored, get distracted and return.
-  * If I don't understand when I return then I don't like it anymore.
-  * goal: If you get distracted for a second you can still understand what is going on.
diff --git a/examples/001/Dockerfile b/examples/001/Dockerfile
index 3657293..3cab792 100644
--- a/examples/001/Dockerfile
+++ b/examples/001/Dockerfile
@@ -1,5 +1,10 @@
+# Initializes a build stage and sets a Base Image.
 FROM alpine:latest
-COPY hello.rb /usr/local/bin/hello
+# Install the ruby package
 RUN apk add ruby
+# Copy file from the host to the Docker image.
+COPY hello.rb /usr/local/bin/hello
+# Give "hello" the executable permission
 RUN chmod +x /usr/local/bin/hello
+# Set the default command to run
 CMD ["hello"]