![]() In order to stay lightweight, the sharing of the host kernel with containers opens this possibility of a security vulnerability. This means that if an attacker gains control over these subsystems, the host is compromised. These include SELinux, Cgroups, and /dev/sd* devices. On top of this, there are other Linux subsystems and devices that aren’t namespaced. These concerns can be mitigated by modifying the configuration file and setting up these abilities from the start–but that may not be obvious at a first glance. There are also limitations on things like cleaning up grandchild processes after you terminate child processes-something traditional Linux containers inherently handle. ![]() This includes being able to use processes like cron or syslog within the container, alongside your app. With Docker, you don’t get the same UNIX-like functionality that you get with traditional Linux containers. Learn more about container orchestration with Kubernetes So, Docker technology is a more granular, controllable, microservices-based approach that places greater value on efficiency. Paired with shorter deployment times, you can easily and cost-effectively create and destroy data created by your containers without concern. And, since an operating system doesn’t need to boot to add or move a container, deployment times are substantially shorter. By creating a container for each process, you can quickly share those processes with new apps. Docker-based containers can reduce deployment to seconds. Getting new hardware up, running, provisioned, and available used to take days, and the level of effort and overhead was burdensome. This supports an agile development approach and helps make continuous integration and deployment (CI/CD) a reality from a tools perspective. Don’t like the current iteration of an image? Roll it back to the previous version. Perhaps the best part about layering is the ability to roll back. Also inherent to layering is version control: Every time there’s a new change, you essentially have a built-in changelog, providing you with full control over your container images. Intermediate changes are shared among images, further improving speed, size, and efficiency. Every time a user specifies a command, such as run or copy, a new layer gets created.ĭocker reuses these layers to build new containers, which accelerates the building process. A layer is created when the image changes. Layers and image version controlĮach Docker image file is made up of a series of layers that are combined into a single image. In addition to this microservices-based approach, you can share processes among multiple apps in much the same way service-oriented architecture (SOA) does. The Docker approach to containerization focuses on the ability to take down a part of an application to update or repair, without having to take down the whole app. And you get flexibility with those containers-you can create, deploy, copy, and move them from environment to environment, which helps optimize your apps for the cloud. With Docker, you can treat containers like extremely lightweight, modular virtual machines. ![]() It then supports the improved and hardened technologies for enterprise customers. The company, Docker Inc., builds on the work of the Docker community, makes it more secure, and shares those advancements back to the greater community. ![]() The open source Docker community works to improve these technologies to benefit all users.The IT software "Docker” is containerization technology that enables the creation and use of Linux® containers.The fact that the technologies and the company share the same name can be confusing. The word "Docker" refers to several things, including an open source community project tools from the open source project Docker Inc., the company that primarily supports that project and the tools that company formally supports. ![]()
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