This document discusses Docker containers and their advantages over virtual machines. It explains that Docker containers are lightweight virtualized environments that share the host operating system kernel. This allows containers to have less overhead than virtual machines. The document notes that containers can achieve greater server consolidation, easier patching and maintenance, faster cloud migration, and increased application security compared to virtual machines. Containers make it easier to deliver services in an agile manner across hybrid and multi-cloud environments.

1. © 2010 VMware Inc. All rights reserved
The containers first approach
Ragini Jain, Saifi Khan
DevOps & DataCenter Automation
Strikr Systems LLP
Bengaluru KA.
saifi@strikr.in
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Docker .. what is ?
Docker is a GNU/Linux namespace + cgroup + unionfs artifact.
A Docker container is a lightweight, easy-to-deploy virtualized operating system (OS)
environment.
Docker is a FOSS platform designed to build, ship, distribute, and run applications
Dockerfile is a declarative description of your application dependencies.
Docker provides the tooling to bundle an application and its dependencies
eg. libraries, frameworks, binaries, and configuration files) into a single,
light-weight container that can run on virtually any machine.
By using containers, processes and resources such as CPU, memory, block I/O,
and networking properties are isolated from the host and any other containers.
Unlike other virtualized OS environments (such as hypervisors), a container does not
need a guest OS because it shares the kernel of its host’s OS.
Docker was developed on GNU/Linux kernel. It has also been ported to
MacOS (XNU/FreeBSD) and Windows NT kernel.

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Docker .. what is ?

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Docker .. what is ?

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Docker

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Docker .. image format

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Docker .. evolution

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Docker .. containerD

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containerD .. integration enabler .. for Docker

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Docker .. highly modular services .. enabled

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Serverless .. builds on .. Docker

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Will Container Replace VM ?
 Yes and it is already happening !
 Your goal is to deliver competitive agile service(s).
 Containers are more agile than VM’s.
 Containers enable Hybrid and Multi-cloud adoption
 Containers integrate with your existing IT
processes
 Containers save on VM licensing dollars
 Containers operate on bare metal
 Containers are secure
 Containers enable Blue-Green deployments
 Containers can also run over VM’s.

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Docker .. inside Data Center
Server consolidation
While virtualization did increase the number of VM per server, studies show that
servers are still greatly underutilized. On average, enterprise customers see
50% greater server consolidation with containerization.
That means being able to pack more workloads onto existing infrastructure
or even reducing the number of servers and therefore saving
on licensing and hardware costs.
Easier patching and maintenance
Containerized applications can be updated easily through changes to the source image
file. This also means it’s possible to update and rollback patches on the fly.
Faster cloud migration
Many IT organizations are responsible for consolidating data center and
migrating a target number of applications to the public cloud.
Containerized applications can be easily deployed to different infrastructure
platforms in a consistent manner.
Increased application security
Containers provide an additional layer of isolation to applications while
also reducing the attack surface.