DockerFrom basics to orchestration

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Overview

Overview

● Environment issues● Virtualization● "Containerization"● Docker

○ Install○ Run○ Build○ Host

● Docker Machine● Docker Compose● Questions

Environment Issues

If you do this, you don't receive your:

Environment Issues

Examples:● substr vs mb_substr functions

Environment Issues

Environment Issues

Examples:● substr vs mb_substr functions● short open tag <?=

Environment Issues

Examples:● substr vs mb_substr functions● short open tag <?=● short array syntax (5.3- vs 5.4+): $a=[];

Environment Issues

Examples:● substr vs mb_substr functions● short open tag <?=● short array syntax (5.3- vs 5.4+): $a=[];● some custom installed extension on dev but

not on prod

Virtualization

● 1960 - cpu time sharing (inspiration)

Virtualization - History

Virtualization - History

● 1960 - cpu time sharing (inspiration)● IBM 370 - Designed for virtualization via

software (CP/CMS).

Virtualization - History

● 1960 - cpu time sharing (inspiration)● IBM 370 - Designed for virtualization via

software (CP/CMS).● IBM z/VM - first success case (via hardware)

Virtualization - History

● 1960 - cpu time sharing (inspiration)● IBM 370 - Designed for virtualization via

software (CP/CMS).● IBM z/VM - first success case (via hardware)● 1990+ - Hypervisors: VMWare, Xen, KVM,

VirtualBox, etc...

Virtualization - Hypervisors

Virtualization - Stack

Virtualization

● Standard environments

Virtualization

● Standard environments

● Improve resources usage

Virtualization

● Standard environments

● Improve resources usage

● Data recovery

Virtualization

● If host hardware fails every VMs fail

● Standard environments

● Improve resources usage

● Data recovery

Virtualization

● If host hardware fails every VMs fail

● Difficult troubleshooting

● Standard environments

● Improve resources usage

● Data recovery

Virtualization

● If host hardware fails every VMs fail

● Difficult troubleshooting

● New layer = Some Overhead

● Standard environments

● Improve resources usage

● Data recovery

Containers - LXC

● Since Jul/2008 - Kernel 2.6.26+

● Since Jul/2008 - Kernel 2.6.26+

● lxc-create, lxc-start, lxc-stop

Containers - LXC

Containers - LXC

● Since Jul/2008 - Kernel 2.6.26+

● lxc-create, lxc-start, lxc-stop

● Shares kernel libs and binaries with host

● Process isolation - 1 Linux PID (chroot)

Containers - LXC

Containers - LXC

● Process isolation - 1 Linux PID (chroot)● Network isolation

Containers - LXC

● Process isolation - 1 Linux PID (chroot)● Network isolation● Define memory limitation

Containers - LXC

● Process isolation - 1 Linux PID (chroot)● Network isolation● Define memory limitation● IO overhead - difficult to share host

volumes with guests

Docker

Docker

Docker

● Copy on write (AUFS)

Docker

● Copy on write (AUFS)● Logging (stdout, stderr, stdin)

Docker

● Copy on write (AUFS)● Logging (stdout, stderr, stdin)● Change management (imgs)

Docker

● Copy on write (AUFS)● Logging (stdout, stderr, stdin)● Change management (imgs)● Automatic build (Dockerfile)

Docker

● Copy on write (AUFS)● Logging (stdout, stderr, stdin)● Change management (imgs)● Automatic build (Dockerfile)● Reusable (FROM: imagename)

Docker

● Copy on write (AUFS)● Logging (stdout, stderr, stdin)● Change management (imgs)● Automatic build (Dockerfile)● Reusable (FROM: imagename)● Easy to share (registry - docker hub)

Docker

Docker

● Copy on write (AUFS)● Logging (stdout, stderr, stdin)● Change management (imgs)● Automatic build (Dockerfile)● Reusable (FROM: imagename)● Easy to share (registry - docker hub)● Private and public registry

● API layer (REST)

Docker

Docker

● API layer (REST)● Fast innovations (compose, machine,

swarm, network)

Docker

Awesome

Docker - Comparison

Docker - Comparison

● Start realy fast

Docker - Comparison

● Start realy fast● Smaller images

Docker - Comparison

● Start realy fast● Smaller images● Easy replication

Docker - Comparison

● Start realy fast● Smaller images● Easy replication● Better resources

utilization

Docker - Comparison

● Start realy fast● Smaller images● Easy replication● Better resources

utilization

● IO overhead

Docker - Comparison

● Start realy fast● Smaller images● Easy replication● Better resources

utilization

● IO overhead● Not too isolated

Docker - Comparison

● Start realy fast● Smaller images● Easy replication● Better resources

utilization

● IO overhead● Not too isolated● Linux ONLY

Docker - Quick Tips

● It's Container not a VM

Docker - Quick Tips

● It's Container not a VM● Why container - because it solves cargo

transport matrix

Docker - Quick Tips

● It's Container not a VM● Why container - because it solves cargo

transport matrix● Why docker, because of docks

Docker - Quick Tips

● It's Container not a VM● Why container - because it solves cargo

transport matrix● Why docker, because of docks● Images are states, Containers runs it

● Go http://docs.docker.com/installation

Docker - Install

● Go http://docs.docker.com/installation● Find you host OS

Docker - Install

● Go http://docs.docker.com/installation● Find you host OS● Follow the instructions

Docker - Install

● Go http://docs.docker.com/installation● Find you host OS● Follow the instructions● FreeBSD hosts will be supported soon

Docker - Install

● Go http://docs.docker.com/installation● Find you host OS● Follow the instructions● FreeBSD hosts will be supported soon● MacOS and Windows needs a VM to act as a

Host - boot2docker sugested

Docker - Install

Docker - Basics

"Talk is cheap, show me the code."Linus Torvalds

● Volume sharing● Port expose/mapping● Links between containers

Docker - Medium

Docker Machine

Creates virtual machines ready to run docker locally or on the cloud.

● Docker Compose (Old FIG) https://docs.docker.com/compose/install/

● Crane - http://getcrane.com● AZK - http://azk.io

Orchestration

Docker Compose

Docker Compose

● Docker Swarm

Docker - Other Cool Stuff

● Docker Swarm● Docker Network

Docker - Other Cool Stuff

● Docker Swarm● Docker Network● OpenContainers - Linux Foundation

Docker - Other Cool Stuff

Slides

Questions

Evaluation