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18 lines
1.8 KiB
Plaintext
18 lines
1.8 KiB
Plaintext
// Module included in the following assemblies:
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// * openshift_images/images-understand.aodc
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:_mod-docs-content-type: CONCEPT
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[id="containers-about_{context}"]
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= Containers
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[role="_abstract"]
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Containers are isolated running instances of container images that serve as the basic units of {product-title} applications. By understanding containers, you can work with containerized applications and manage how they run in your cluster.
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Many application instances can be running in containers on a single host without visibility into each others' processes, files, network, and so on. Typically, each container provides a single service, often called a micro-service, such as a web server or a database, though containers can be used for arbitrary workloads.
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The Linux kernel has been incorporating capabilities for container technologies for years. The Docker project developed a convenient management interface for Linux containers on a host. More recently, the link:https://github.com/opencontainers/[Open Container Initiative] has developed open standards for container formats and container runtimes. {product-title} and Kubernetes add the ability to orchestrate OCI- and Docker-formatted containers across multi-host installations.
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Though you do not directly interact with container runtimes when using {product-title}, understanding their capabilities and terminology is important for understanding their role in {product-title} and how your applications function inside of containers.
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Tools such as link:https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux_atomic_host/7/html-single/managing_containers/#using_podman_to_work_with_containers[Podman] can be used to replace Docker command-line tools for running and managing containers directly. By using the `podman` CLI, you can experiment with containers separately from {product-title}.
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