Containers Revealed - LAOUC Tour '23 - Costa Rica

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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

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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

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@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

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@ViscosityNA www.viscosityna.com What Are Containers?

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Containers are like lightweight Virtual Machines, right?

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@ViscosityNA www.viscosityna.com Three databases Three schemas

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@ViscosityNA www.viscosityna.com Three full operating systems Three application/executable directories

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@ViscosityNA www.viscosityna.com Three full operating systems Three application/executable directories

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@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

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@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

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@ViscosityNA www.viscosityna.com vo • cab • u • lar • y

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@ViscosityNA www.viscosityna.com Stateful Stateless Persistent Immutable Ephemeral Cloud Native Context   Builds Layers Images Services Dockerfile Containers Union Filesystems

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@ViscosityNA www.viscosityna.com Games have structured playing surfaces and rules.

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@ViscosityNA www.viscosityna.com Services deliver games to players.

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@ViscosityNA www.viscosityna.com Images include the game rules and playing surface.

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@ViscosityNA www.viscosityna.com Images are a minimal filesystem & metadata needed to run a service.

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@ViscosityNA www.viscosityna.com Running an image starts a Container.

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@ViscosityNA www.viscosityna.com A container is: A process on a host, and; A Union Filesystem.

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@ViscosityNA www.viscosityna.com Container processes are isolated.

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@ViscosityNA www.viscosityna.com A Union Filesystem has three layers: A Merge or Union Layer. An Upper Layer. A Lower Layer.

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@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.

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@ViscosityNA www.viscosityna.com

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@ViscosityNA www.viscosityna.com The Upper (merge) layer isn't "real."

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@ViscosityNA www.viscosityna.com The Upper (merge) layer isn't "real." It's a perceived (calculated) union of: • The game board & rules • Game play

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@ViscosityNA www.viscosityna.com Containers persist state (moves) in the run-time layer of its Union Filesystem. Containers are stateful.

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@ViscosityNA www.viscosityna.com Deleting a container removes its Union Filesystem (and its run-time layer). Containers are Ephemeral

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@ViscosityNA www.viscosityna.com Images are immutable and never change.

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@ViscosityNA www.viscosityna.com Stalemate!

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@ViscosityNA www.viscosityna.com Shift the Image Right Moves fall off the game board: Changing an image changes the game!

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@ViscosityNA www.viscosityna.com Images are immutable and can't persist state information. They are stateless.

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@ViscosityNA www.viscosityna.com Images = Static Containers = Living

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@ViscosityNA www.viscosityna.com Containers are Magic!

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@ViscosityNA www.viscosityna.com How much space do three containers use? 500MB  + 500MB   + 500MB 500MB 500MB  + 500MB   + 500MB 1,500MB 500MB 500MB 500MB +

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@ViscosityNA www.viscosityna.com Multiple identical containers will share an image.

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@ViscosityNA www.viscosityna.com Build & Bake Images

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@ViscosityNA www.viscosityna.com A Dockerfile is a recipe for building images.

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@ViscosityNA www.viscosityna.com Paper Tic-Tac-Toe Grid

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@ViscosityNA www.viscosityna.com Image layers are modular and reusable. Layers can be cached and reused among multiple images.

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@ViscosityNA www.viscosityna.com Paper Game of Sums 3x3 Sudoku Tic-Tac-Toe Grid

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@ViscosityNA www.viscosityna.com Context is a pantry of image ingredients.

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@ViscosityNA www.viscosityna.com Ignore files limit and control the build context.

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@ViscosityNA www.viscosityna.com Contact Me sean.scott@viscosityna.com https://linktr.ee/oraclesean