Containers Revealed - LAOUC Tour '23 - Costa Rica

What are containers and how do they work? Are they "lightweight virtual machines " or something else? Truly understanding containers means looking beneath the surface, revealing the magical sleight-of-hand responsible for their speed, consistency, portability, and efficiency. In this session, I'll introduce a new way of representing how containers work—without a deep dive into the Linux kernel—using just a game of Tic-Tac-Toe! It's guaranteed to open your eyes, whether you're new to containers or a seasoned pro! Unlocking this understanding will forever change how you see and work with containers!

Transcript

1. Containers Revealed: Easy as Tic-Tac-Toe Sean Scott Oracle ACE Director DoK Community Ambassador Managing Principal Consultant @oraclesean linkedin.com/in/soscott/ sean.scott@viscosityna.com @ViscosityNA www.viscosityna.com Latin America Community Tour '23 - Costa Rica July 31, 2023
2. DATABASE RELIABILITY ENGINEERING ⁘ DEVOPS & AUTOMATION 
 HIGH AVAILABILITY ⁘ BUSINESS CONTINUITY ⁘ DISASTER RECOVERY 
 MODERNIZATION ⁘ OBSERVABILITY ⁘ ENGINEERED SYSTEMS AutoUpgrade ⁘ Zero Downtime Migrations ⁘ Patching Real Application Clusters ⁘ Data Guard ⁘ Sharding Docker/Containers ⁘ Terraform ⁘ Ansible Exadata ⁘ Oracle Database Appliance AHF ⁘ TFA ⁘ GIMR ⁘ CHA Sean Scott Oracle ACE Director DoK Community Ambassador Managing Principal Consultant @oraclesean linkedin.com/in/soscott/ sean.scott@viscosityna.com @ViscosityNA www.viscosityna.com
3. @ViscosityNA www.viscosityna.com Oracle on Docker Running Oracle Databases in Linux Containers Download a free sample chapter: 
 https:/ /oraclesean.com 20% Discount Code: OracleDocker https:/ /link.springer.com
4. @ViscosityNA www.viscosityna.com What Are Containers?
5. Containers are like lightweight Virtual Machines, right?
7. @ViscosityNA www.viscosityna.com Three databases Three schemas
8. @ViscosityNA www.viscosityna.com Three full operating systems Three application/executable directories
9. @ViscosityNA www.viscosityna.com Three full operating systems Three application/executable directories
10. @ViscosityNA www.viscosityna.com www.viscosityna.com @ViscosityNA 13 Oracle Databases on a Laptop 2018 MacBook Pro 15", 2.2GHz 6-core Intel Core i7, 16GB, 1TB SSD
11. @ViscosityNA www.viscosityna.com Virtual Machines: Bootable OS, often heavy A 100-page book of games & puzzles Containers: Support one application or service A sheet of paper with a Tic-Tac-Toe grid
12. @ViscosityNA www.viscosityna.com vo • cab • u • lar • y
13. @ViscosityNA www.viscosityna.com Stateful Stateless Persistent Immutable Ephemeral Cloud Native Context 
 Builds Layers Images Services Dockerfile Containers Union Filesystems
16. @ViscosityNA www.viscosityna.com Games have structured playing surfaces and rules.
17. @ViscosityNA www.viscosityna.com Services deliver games to players.
18. @ViscosityNA www.viscosityna.com Images include the game rules and playing surface.
19. @ViscosityNA www.viscosityna.com Images are a minimal filesystem & metadata needed to run a service.
20. @ViscosityNA www.viscosityna.com Running an image starts a Container.
21. @ViscosityNA www.viscosityna.com A container is: A process on a host, and; A Union Filesystem.
22. @ViscosityNA www.viscosityna.com Container processes are isolated.
23. @ViscosityNA www.viscosityna.com A Union Filesystem has three layers: A Merge or Union Layer. An Upper Layer. A Lower Layer.
24. @ViscosityNA www.viscosityna.com A Union Filesystem has three layers: A Merge or Union Layer: The game. An Upper Layer: The container. A Lower Layer: The image.
25. @ViscosityNA www.viscosityna.com
26. @ViscosityNA www.viscosityna.com The Upper (merge) layer isn't "real."
27. @ViscosityNA www.viscosityna.com The Upper (merge) layer isn't "real." It's a perceived (calculated) union of: • The game board & rules • Game play
28. @ViscosityNA www.viscosityna.com Containers persist state (moves) in the run-time layer of its Union Filesystem. Containers are stateful.
29. @ViscosityNA www.viscosityna.com Deleting a container removes its Union Filesystem (and its run-time layer). Containers are Ephemeral
30. @ViscosityNA www.viscosityna.com Images are immutable and never change.
31. @ViscosityNA www.viscosityna.com Stalemate!
32. @ViscosityNA www.viscosityna.com Shift the Image Right Moves fall off the game board: Changing an image changes the game!
33. @ViscosityNA www.viscosityna.com Images are immutable and can't persist state information. They are stateless.
34. @ViscosityNA www.viscosityna.com Images = Static Containers = Living
35. @ViscosityNA www.viscosityna.com Containers are Magic!
36. @ViscosityNA www.viscosityna.com How much space do three containers use? 500MB
 + 500MB 
 + 500MB 500MB 500MB
 + 500MB 
 + 500MB 1,500MB 500MB 500MB 500MB +
37. @ViscosityNA www.viscosityna.com Multiple identical containers will share an image.
38. @ViscosityNA www.viscosityna.com Build & Bake Images
39. @ViscosityNA www.viscosityna.com A Dockerfile is a recipe for building images.
40. @ViscosityNA www.viscosityna.com Paper Tic-Tac-Toe Grid
41. @ViscosityNA www.viscosityna.com Image layers are modular and reusable. Layers can be cached and reused among multiple images.
42. @ViscosityNA www.viscosityna.com Paper Game of Sums 3x3 Sudoku Tic-Tac-Toe Grid
43. @ViscosityNA www.viscosityna.com Context is a pantry of image ingredients.
44. @ViscosityNA www.viscosityna.com Ignore files limit and control the build context.
45. @ViscosityNA www.viscosityna.com Contact Me sean.scott@viscosityna.com https://linktr.ee/oraclesean