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The main classes of Docker objects are images, containers, and services. [22] A Docker container is a standardized, encapsulated environment that runs applications. [25] A container is managed using the Docker API or CLI. [22] A Docker image is a read-only template used to build containers. Images are used to store and ship applications. [22]
The image-spec is a software shipping container image format spec (OCI Image Format) that reached version 1.0.0 on July 19, 2017. [ 12 ] The OCI Distribution Spec Project defines the distribution-spec, an API protocol to facilitate and standardize the distribution of content.
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.
Using this client, one can directly interact with the build-related resources using sub-commands (such as "new-build" or "start-build"). In addition to this, an OpenShift-native pod builds technology called Source-to-Image (S2I) is available out of the box, though this is slowly being phased out in favor of Tekton — which is a cloud native ...
Unionfs can also be used to create a single common template for a number of file systems, or for security reasons. It is sometimes used as an ad hoc snapshotting system. Docker uses file systems inspired by Unionfs, such as Aufs, to layer Docker images. As actions are done to a base image, layers are created and documented, such that each layer ...
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.
In computing, Podman (pod manager) is an open source Open Container Initiative (OCI)-compliant [2] container management tool from Red Hat used for handling containers, images, volumes, and pods on the Linux operating system, [3] with support for macOS and Microsoft Windows via a virtual machine. [4]
An Amazon Machine Image (AMI) is a special type of virtual appliance that is used to create a virtual machine within the Amazon Elastic Compute Cloud (EC2). It serves as the basic unit of deployment for services delivered using EC2.