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A Docker image is a read-only template used to build containers. Images are used to store and ship applications. [22] A Docker service allows containers to be scaled across multiple Docker daemons. The result is known as a swarm, a set of cooperating daemons that communicate through the Docker API. [22] Registries: A Docker registry is a ...
Container clusters need to be managed. This includes functionality to create a cluster, to upgrade the software or repair it, balance the load between existing instances, scale by starting or stopping instances to adapt to the number of users, to log activities and monitor produced logs or the application itself by querying sensors.
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 differences between various container formats arise from five main issues: Popularity; how widely supported a container is. Overhead. This is the difference in file-size between two files with the same content in a different container. Support for advanced codec functionality.
A virtual appliance is a virtual machine image designed to run on a specific virtualization platform, while a software appliance is often packaged in more generally applicable image format (e.g., Live CD) that supports installations to physical machines and multiple types of virtual machines. [4] [5] [6]
The Open Container Initiative (OCI) is a Linux Foundation project, started in June 2015 by Docker, CoreOS, and the maintainers of appc (short for "App Container") to design open standards for operating system-level virtualization .
This changed in v3 with the adoption of Docker as the container technology, and Kubernetes as the container orchestration technology. [6] The v4 product has many other architectural changes - a prominent one being a shift to using CRI-O, as the container runtime (and Podman for interacting with pods and containers), and Buildah as the container ...
The latter had been a separate software package in earlier history. By 2007 the term Solaris Containers came to mean a Solaris Zone combined with resource management controls. Later, there was a gradual move such that Solaris Containers specifically referred to non-global zones, with or without additional Resource Management.