![]() ![]() Today Docker containerization also works with Microsoft Windows and Apple MacOS. Shared container libraries: Developers can access an open-source registry containing thousands of user-contributed containers.It can even upload only the deltas between an existing version and a new one.Ĭontainer reuse: Existing containers can be used as base images-essentially like templates for building new containers. This makes it possible to build an application that can continue running while one of its parts is taken down for an update or repair.Īutomated container creation: Docker can automatically build a container based on application source code.Ĭontainer versioning: Docker can track versions of a container image, roll back to previous versions, and trace who built a version and how. Improved and seamless container portability: While LXC containers often reference machine-specific configurations, Docker containers run without modification across any desktop, data center and cloud environment.Įven lighter weight and more granular updates: With LXC, multiple processes can be combined within a single container.Ubuntu, a modern, open-source Linux operating system, also provides this capability.ĭocker lets developers access these native containerization capabilities using simple commands, and automate them through a work-saving application programming interface (API). While LXC is still used today, newer technologies using the Linux kernel are available. Most notably, in 2008, LinuXContainers (LXC) was implemented in the Linux kernel, fully enabling virtualization for a single instance of Linux. But the first container-related technologies were available for years-even decades (link resides outside IBM)-before Docker was released to the public in 2013. Learn more with this interactive tool: Download the full report: Containers in the enterprise (PDF, 1.4MB)ĭocker is so popular today that “Docker” and “containers” are used interchangeably. This can reduce cloud spending.Ĭompanies using containers report other benefits including improved app quality, faster response to market changes and much more. ![]() Greater resource efficiency: With containers, developers can run several times as many copies of an application on the same hardware as they can using VMs. This makes them ideal for use in continuous integration and continuous delivery (CI/CD) pipelines and a better fit for development teams adopting Agile and DevOps practices. And compared to VMs, containers are faster and easier to deploy, provision and restart. Improved developer productivity: Containerized applications can be written once and run anywhere. gigabytes for some VMs), make better use of hardware capacity, and have faster startup times. Container sizes are measured in megabytes (vs. They include only the OS processes and dependencies necessary to execute the code. Lighter weight: Unlike VMs, containers don’t carry the payload of an entire OS instance and hypervisor. These capabilities-such as control groups (Cgroups) for allocating resources among processes, and namespaces for restricting a processes access or visibility into other resources or areas of the system-enable multiple application components to share the resources of a single instance of the host operating system in much the same way that a hypervisor enables multiple virtual machines (VMs) to share the CPU, memory and other resources of a single hardware server.Īs a result, container technology offers all the functionality and benefits of VMs-including application isolation, cost-effective scalability, and disposability-plus important additional advantages: At this writing, Docker reported over 13 million developers using the platform (link resides outside ibm.com).ĭocker also refers to Docker, Inc. (link resides outside ibm.com), the company that sells the commercial version of Docker, and to the Docker open source project to which Docker, Inc, and many other organizations and individuals contribute.Ĭontainers are made possible by process isolation and virtualization capabilities built into the Linux kernel. But Docker makes containerization faster, easier and safer. It’s possible for developers to create containers without Docker, by working directly with capabilities built into Linux and other operating systems. They have become increasingly popular as organizations shift to cloud-native development and hybrid multicloud environments. Docker is an open source platform that enables developers to build, deploy, run, update and manage containers-standardized, executable components that combine application source code with the operating system (OS) libraries and dependencies required to run that code in any environment.Ĭontainers simplify development and delivery of distributed applications.
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