Docker workshop

Joern Barthel

Warsaw, 26.09.2014

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About us > 30 IT consultants

Offices in Berlin & Warsaw

Core areas of expertise Cloud consulting and change management Architecture and Development Operations

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Setup Virtualbox + Linux

Vagrant

Git

Clone the repo and vagrant up

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Introduction to Docker Go client/server

Userland virtualization

Vastly different scope

Abstract vs. concrete

No concept of changing state from A to B

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Components Build

Dockerfiles = series of command Immutable images = snapshots of state Commands and context Relationships and unions Caching

Distribute

Run

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Components Build

Distribute Naming images Push and pull to/from repositories Only transfer images the client does not know about

Run

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Components Build

Distribute

Run Container process R/W image

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Architecture

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Architecture Exec drivers

Namespaces & SELinux

Filters and bridges

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Architecture Storage drivers

CoW: btrfs Union: aufs Hardcopies

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Separation of roles Running containers

Naming stuff Linking containers Beyond linking:

Mapping filesystems

Mapping ports

Restricting resources

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CoreOS systemd: greedy pid 1

Socket Activation Journal Watchdogs Encryption, quotas, automounting D-Bus

btrfs: 5th generation fs

dockerd

etcd, locksmithd & fleetd

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Hands on

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