book

Docker Deep Dive

by Nigel Poulton

October 2020

Beginner

250 pages

6h 21m

English

Packt Publishing

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0: About the bookWhy should I read this book or care about Docker?What if I’m not a developerShould I buy the book if I’ve already watched your video training courses?How the book is organizedEditions of the bookHaving problems getting the latest updates on your Kindle?The paperback editionLeave a review
The bad old daysHello VMware!VMwartsHello Containers!Linux containersHello Docker!Windows containersWindows containers vs Linux containersWhat about Mac containers?What about KubernetesChapter Summary
Docker - The TLDRDocker, Inc.The Docker technologyThe Open Container Initiative (OCI)Chapter summary
Docker DesktopWindows pre-reqsInstalling Docker Desktop on Windows 10Installing Docker Desktop on MacInstalling Docker on LinuxInstalling Docker on Windows Server 2019Play with DockerChapter Summary
The Ops PerspectiveImagesContainersAttaching to running containersThe Dev PerspectiveChapter Summary
Docker Engine - The TLDRDocker Engine - The Deep DiveGetting rid of LXCGetting rid of the monolithic Docker daemonThe influence of the Open Container Initiative (OCI)runccontainerdStarting a new container (example)One huge benefit of this modelWhat’s this shim all about?How it’s implemented on LinuxWhat’s the point of the daemonSecuring client and daemon communicationChapter summary
Docker images - The TLDRDocker images - The deep diveImages and containersImages are usually smallPulling imagesImage namingImage registriesImage naming and taggingImages with multiple tagsFiltering the output of docker image lsSearching Docker Hub from the CLIImages and layersSharing image layersPulling images by digestA little bit more about image hashes (digests)Multi-architecture imagesDeleting ImagesImages - The commandsChapter summary
Docker containers - The TLDRDocker containers - The deep diveContainers vs VMsThe VM taxRunning containersChecking that Docker is runningStarting a simple containerContainer processesContainer lifecycleStopping containers gracefullySelf-healing containers with restart policiesWeb server exampleInspecting containersTidying upContainers - The commandsChapter summary

Containerizing an app - The TLDRContainerizing an app - The deep diveContainerize a single-container appMoving to production with Multi-stage BuildsA few best practicesContainerizing an app - The commandsChapter summary
Deploying apps with Compose - The TLDRDeploying apps with Compose - The Deep DiveCompose backgroundInstalling ComposeCompose filesDeploying an app with ComposeManaging an app with ComposeDeploying apps with Compose - The commandsChapter Summary
Docker Swarm - The TLDRDocker Swarm - The Deep DiveSwarm primerBuild a secure Swarm clusterSwarm manager high availability (HA)Swarm servicesViewing and inspecting servicesReplicated vs global servicesScaling a serviceRemoving a serviceRolling updatesTroubleshootingBacking up SwarmDocker Swarm - The CommandsChapter summary
Docker Networking - The TLDRDocker Networking - The Deep DiveThe theorySingle-host bridge networksMulti-host overlay networksConnecting to existing networksService discoveryIngress load balancingDocker Networking - The CommandsChapter Summary
Docker overlay networking - The TLDRDocker overlay networking - The deep diveBuild and test a Docker overlay network in Swarm modeTest the overlay networkThe theory of how it all worksDocker overlay networking - The commandsChapter Summary
Volumes and persistent data - The TLDRVolumes and persistent data - The Deep DiveContainers and non-persistent dataContainers and persistent dataDemonstrating volumes with containers and servicesSharing storage across cluster nodesVolumes and persistent data - The CommandsChapter Summary
Deploying apps with Docker Stacks - The TLDRDeploying apps with Docker Stacks - The Deep DiveOverview of the sample appLooking closer at the stack fileDeploying the appManaging the appDeploying apps with Docker Stacks - The CommandsChapter Summary
Security in Docker - The TLDRSecurity in Docker - The deep diveLinux security technologiesDocker platform security technologiesDocker SecretsChapter Summary
Practice makes perfectVideo trainingGet involved with the communityKubernetesFeedback and connecting

Content preview from Docker Deep Dive

6: Images

In this chapter we’ll dive deep into Docker images. The aim of the game is to give you a solid understanding of what Docker images are, how to perform basic operations, and how they work under-the-hood.

We’ll see how to build new images with our own applications inside of them in a later chapter.

We’ll split this chapter into the usual three parts:

The TLDR
The deep dive
The commands

Docker images - The TLDR

A Docker image is a unit of packaging that contains everything required for an application to run. This includes; application code, application dependencies, and OS constructs. If you have an application’s Docker image, the only other thing you need to run that application is a computer running Docker.

If you’re a former VM ...