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Containers 101 | @DevOpsSummit #CloudNative #Serverless #DevOps #Docker

What are containers, exactly? And why are they so rapidly grabbing developer market share from virtual machines?

Containers 101: What You Need to Know

Containers are the future of web development, in large part thanks to Docker's explosive growth. According to DataDog, 15 percent of hosts run Docker, which is significantly up from the 6 percent of hosts running it at this point in 2015. LinkedIn has also seen a 160 percent increase in profile references to Docker in just the past year alone, indicating Docker has become a much bigger priority for IT professionals looking for work. With this technology primed to continue its exponential growth in the coming years, here's a Q&A rundown of the basics: consider it Containers 101.

What are containers, exactly? And why are they so rapidly grabbing developer market share from virtual machines?

In order to better understand containers, it's helpful to consider them in contrast to virtual machines.

A virtual machine (VM) is an emulation of an entire operating system managed by a hypervisor. A VM may be run over the top of another OS or directly off the hardware. In either case, one VM can and usually will be run alongside other VMs, all of which are allocated their own set static space and resources by the hypervisor, with each VM acting as its own independent computer.

A container is a self-contained (it's right there in the name) execution environment with its own isolated network resources. At a quick glance, a container may appear very similar to a VM. The key difference is that a container does not emulate a separate OS. Containers instead create separate, independent user spaces that have their own bins and libs, but that share the host operating system's kernel with all other containers running on a machine. This being the case, containers do not need to be assigned their own set amount of RAM and other resources; they simply make use of whatever they need while they're running.

In short: a virtual machine virtualizes the hardware, while a container virtualizes the OS.

This means containers are significantly more lightweight than VMs. They can be spun up in seconds instead of minutes and you can run as many as 8x as many of them on a single machine. Since the OS has been abstracted away, containers can be easily moved from one machine to another. They're developer- and DevOps-friendly, and offer improved infrastructure and cost efficiency.

What is contained in a container?
A container is made up of container images that bundle up the code and all its dependencies. One of these container images will be the app itself. The other images will be the libraries and binaries needed to run that app. All the images that make up the container are then turned into an image template that can be reused across multiple hosts.

It may sound like a lot of effort to add all the necessary individual images to a container, but all your images are stored and run out of a registry. If your application needs Ubuntu, PHP 7.0, and Apache to run then you'll reference these in your config file and your container manager will pull them from this registry (assuming they're there).

Where does Docker come into all of this?
Containers are nothing new - they've been part of Linux since the creation of chroot in 1982 - but to run them, you need a container manager like the one referenced above. Docker is by far the most popular of these (it's nearly synonymous with containers at this point) and has been at the forefront of the rapid surge in container usage. What sets it apart?

The Docker Hub: This hub is the registry where your various images are privately stored. It's also a rich ecosystem of public images built by other Docker users that you can pull down and use for your own projects. Why do all the grunt work when there are other people out there who have already done it?

Portability: Containers are already portable just by the nature of their design, but Docker guarantees the environment will be exactly the same when moving an image from one Docker host to another so you can build once and run anywhere.

Easy Version History and Rollbacks: Docker containers are read-only post-creation. That doesn't mean you can't make changes. What it means is that any changes are used to create new images whenever you run the "docker commit" command. These new images become new containers that you run just like the original. If an alteration leads to problems in a new image, then you can simply go back to the previous one.

Docker is open source and its technology is the basis of the Open Containers Initiative, which is a Linux Foundation initiative focused on creating "industry standards around container formats and runtime." Google, Amazon, Microsoft and other industry leaders are also part of the OCI.

Are containers available only on Linux?

Until very recently the answer was yes, but Microsoft added container support to Windows Server 2016. This can be managed using Docker for Windows.

Will containers replace virtual machines?

Though containers will absolutely continue to rise in popularity, it's incredibly unlikely they'll replace VMs. Stateful application roles and legacy apps that cannot be refactored will continue to run on VMs. More likely the two will be used in concert with each other, each being put to use where most appropriate. Occasionally, containers might even be run within virtual machines, warping the space time continuum and confusing partisans of both approaches. We truly live in the future.

There are particular concerns about containers and security, as the varied images provide more points of entry for attackers and a container's direct access to the OS kernel creates a larger surface area for attack than would be found in a hypervisor-controlled virtual machine. Automation, as usual, is the key to ensuring solid security.

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DXWordEXPO New York 2018, colocated with CloudEXPO New York 2018 will be held November 11-13, 2018, in New York City and will bring together Cloud Computing, FinTech and Blockchain, Digital Transformation, Big Data, Internet of Things, DevOps,  AI, Machine Learning and WebRTC to one location.

CloudEXPO Speaking Proposals ▸ Here
DXWorldEXPO Speaking Proposals
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Cloud Topics will include:

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CloudEXPO Speaking Proposals ▸ Here
DXWorldEXPO Speaking Proposals
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Digital Transformation (DX) is a major focus with the introduction of DXWorldEXPO within the program. Successful transformation requires a laser focus on being data-driven and on using all the tools available that enable transformation if they plan to survive over the long term.

A total of 88% of Fortune 500 companies from a generation ago are now out of business. Only 12% still survive. Similar percentages are found throughout enterprises of all sizes.

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  • CloudEXPO - Enterprise Cloud
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DXWorldEXPO | CloudEXPO 2018 New York cover all of these tools, with the most comprehensive program and with 222 rockstar speakers throughout our industry presenting 22 Keynotes and General Sessions, 200 Breakout Sessions along 10 Tracks, as well as our signature Power Panels. Our Expo Floor brings together the world's leading companies throughout the world of Cloud Computing, DevOps, FinTech, Digital Transformation, and all they entail.

As your enterprise creates a vision and strategy that enables you to create your own unique, long-term success, learning about all the technologies involved is essential. Companies today not only form multi-cloud and hybrid cloud architectures, but create them with built-in cognitive capabilities.

Cloud-Native thinking is now the norm in financial services, manufacturing, telco, healthcare, transportation, energy, media, entertainment, retail and other consumer industries, as well as the public sector.

CloudEXPO is the world's most influential technology event where Cloud Computing was coined over a decade ago and where technology buyers and vendors meet to experience and discuss the big picture of Digital Transformation and all of the strategies, tactics, and tools they need to realize their goals.

FinTech Is Now Part of the DXWorldEXPO | CloudEXPO Program!

Financial enterprises in New York City, London, Singapore, and other world financial capitals are embracing a new generation of smart, automated FinTech that eliminates many cumbersome, slow, and expensive intermediate processes from their businesses.

Accordingly, attendees at the upcoming 22nd CloudEXPO | DXWorldEXPO November 11-13, 2018 in New York City will find fresh new content in two new tracks called:

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which will incorporate FinTech and Blockchain, as well as machine learning, artificial intelligence and deep learning in these two distinct tracks.

Register for Full Conference "Gold Pass" ▸ Here (Expo Hall ▸ Here)

Sponsorship Opportunities Here

Speaking Opportunities Here

Sponsorship and Speaking Inquiries: [email protected].

FinTech brings efficiency as well as the ability to deliver new services and a much improved customer experience throughout the global financial services industry. FinTech is a natural fit with cloud computing, as new services are quickly developed, deployed, and scaled on public, private, and hybrid clouds.

More than US$20 billion in venture capital is being invested in FinTech this year. DXWorldEXPOCloudEXPO are pleased to bring you the latest FinTech developments as an integral part of our program.

DXWorldEXPO | CloudEXPO are accepting speaking submissions for this new track, so please visit Cloud Computing Expo for the latest information or contact us at [email protected]

Register for Full Conference "Gold Pass" ▸ Here (Expo Hall ▸ Here)

Sponsorship Opportunities Here

Speaking Opportunities Here

Sponsorship and Speaking Inquiries: [email protected].

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Only DXWorldEXPO | CloudEXPO bring together all this in a single location:

Attend DXWorldEXPO | CloudEXPO. Build your own custom experience. Learn about the world's latest technologies and chart your course to Digital Transformation.

22nd International DXWorldEXPO | CloudEXPO, taking place November 11-13, 2018, in New York City, will feature technical sessions from a rock star conference faculty and the leading industry players in the world.

Register for Full Conference "Gold Pass" ▸ Here (Expo Hall ▸ Here)

Sponsorship Opportunities Here

Speaking Opportunities Here

Sponsorship and Speaking Inquiries: [email protected].

Download Slide Deck: ▸ Here

Cloud computing is now being embraced by a majority of enterprises of all sizes. Yesterday's debate about public vs. private has transformed into the reality of hybrid cloud: a recent survey shows that 74% of enterprises have a hybrid cloud strategy. Meanwhile, 94% of enterprises are using some form of XaaS - software, platform, and infrastructure as a service.

With major technology companies and startups seriously embracing Cloud strategies, now is the perfect time to attend and learn what is going on, contribute to the discussions, and ensure that your enterprise is on the right path to Digital Transformation.

Every Global 2000 enterprise in the world is now integrating cloud computing in some form into its IT development and operations. Midsize and small businesses are also migrating to the cloud in increasing numbers.

Register for Full Conference "Gold Pass" ▸ Here (Expo Hall ▸ Here)

Sponsorship Opportunities Here

Speaking Opportunities Here

Sponsorship and Speaking Inquiries: [email protected].

Download Slide Deck: ▸ Here

Companies are each developing their unique mix of cloud technologies and services, forming multi-cloud and hybrid cloud architectures and deployments across all major industries. Cloud-driven thinking has become the norm in financial services, manufacturing, telco, healthcare, transportation, energy, media, entertainment, retail and other consumer industries, and the public sector.

Sponsorship Opportunities

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The upcoming 22nd International DXWorldEXPO | CloudEXPO November 11-13, 2018 in New York City, NY announces that its Call For Papers for speaking opportunities is now open.

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About DXWorldEXPO LLC

DXWorldEXPO LLC is a Lighthouse Point, Florida-based trade show company and the creator of DXWorldEXPODigital Transformation Conference & Expo. The company produces and presents CloudEXPO, DevOpsSummitFinTechEXPO Blockchain Event, the world's most influential conferences and trade shows.

More Stories By Amit Gupta

Amit Gupta’s career spans 19 years building software products and services across various domains including application hosting, public, private cloud infrastructures. At CloudPassage, he is a hands-on product executive leading definition and delivery of all product offerings. He is also responsible for evangelizing CloudPassage’s product strategy and vision with clients, partners and industry leaders.

Most recently, he led product management for VMware’s public cloud offering where he grew it from a concept to a global infrastructure offering across 11 data centers worldwide. Prior to VMware, he led product management for a cloud service broker platform at Cisco. And before that he held various engineering and product management roles at Ensim (acquired by Ingram Micro), building provisioning and automation software for infrastructure and application hosting services.

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