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In software engineering, containerization is operating-system–level virtualization or application-level virtualization over multiple network resources so that software applications can run in isolated user spaces called containers in any cloud or non-cloud environment, regardless of type or vendor. [1]
Docker Compose is a tool for defining and running multi-container Docker applications. [29] It uses YAML files to configure the application's services and performs the creation and start-up process of all the containers with a single command.
OS-level virtualization is an operating system (OS) virtualization paradigm in which the kernel allows the existence of multiple isolated user space instances, including containers (LXC, Solaris Containers, AIX WPARs, HP-UX SRP Containers, Docker, Podman), zones (Solaris Containers), virtual private servers (), partitions, virtual environments (VEs), virtual kernels (DragonFly BSD), and jails ...
The OCI organization includes the development of runc, which is the reference implementation of the runtime-spec, [7] [8] a container runtime that implements their specification and serves as a basis for other higher-level tools. runc was first released in July 2015 as version 0.0.1 [9] and it reached version 1.0.0 on June 22, 2021.
Starting with the LXC 1.0 release, it is possible to run containers as regular users on the host using "unprivileged containers". [10] Unprivileged containers are more limited in that they cannot access hardware directly. However, even privileged containers should provide adequate isolation in the LXC 1.0 security model, if properly configured ...
Container Linux provides no package manager as a way for distributing payload applications, requiring instead all applications to run inside their containers. Serving as a single control host, a Container Linux instance uses the underlying operating-system-level virtualization features of the Linux kernel to create and configure multiple containers that perform as isolated Linux systems.
Each container is a separate entity, and behaves largely as a physical server would. Each has its own: Files System libraries, applications, virtualized /proc and /sys, virtualized locks, etc. Users and groups Each container has its own root user, as well as other users and groups. Process tree A container only sees its own processes (starting ...
Kubernetes assembles one or more computers, either virtual machines or bare metal, into a cluster which can run workloads in containers. It works with various container runtimes, such as containerd and CRI-O. [7] Its suitability for running and managing workloads of all sizes and styles has led to its widespread adoption in clouds and data centers.