Containers in Cloud

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Agenda

• Why Containers?• What are Containers?• History of Containers• Docker• Orchestration• Docker Swarm• Demo (If you are still awake)

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Why Containers?

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Why Containers?

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Complex Systems with many payloads

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Multiple targets

QA

Build server

Stage Prod

Cloud(s)

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Problem

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Similar problem

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Solution

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What are Containers?

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What are containers?

Containers offer an isolated environment – as close as possible to a VM – without the overhead of running a separate kernel and simulating all the hardware

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Virtualization vs Containerization

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History of Containers

• Chroot – 1979• FreeBSD Jails – 2000• Linux Vserver – 2001• Solaris Containers – 2004• OpenVZ – 2005• Process Containers – 2006• Control Groups (cgroups) – 2007• LXC – 2008• Warden – 2011• LMCTFY – 2013• Docker – 2013• Rocket (rkt) – 2014

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LXC

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Docker

• Open Source• Builds on top of LXC• Provides portable format and

runtime environment to deploy application inside containers

• Containers optimized by layers• Manages dependencies

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Docker Architecture

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How it works?

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Containers before Docker

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Containers after Docker

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Container Orchestration

• Manage/Provision multi-container applications

• Application blueprint from a schema (JSON or YAML)

• Monitoring• Upgrades (rolling) and Rollback• Policy management• Service discovery• Ease of use• Integration with existing systems

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Docker Swarm

$ docker swarm init

$ docker swarm join

• Cluster management within the Docker engine• No additional software to manage a Swarm• Easy to setup• Scaling• Built-In

• Multi-host networking• Service discovery• Load balancing (L4)• Security• Rolling updates

• But… Not a real orchestration tool (not yet!)

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Demo