mirror of https://github.com/k3s-io/k3s
53 lines
2.7 KiB
Markdown
53 lines
2.7 KiB
Markdown
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# Glossary and Concept Index
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**Authorization**
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:Kubernetes does not currently have an authorization system. Anyone with the cluster password can do anything. We plan
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to add sophisticated authorization, and to make it pluggable. See the [access control design doc](./devel/access.md) and
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[this issue](https://github.com/GoogleCloudPlatform/kubernetes/issue/1430).
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**Annotation**
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: A key/value pair that can hold large (compared to a Label), and possibly not human-readable data. Intended to store
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non-identifying metadata associated with an object, such as provenance information. Not indexed.
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**Image**
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: A [Docker Image](https://docs.docker.com/userguide/dockerimages/). See [images](./images.md).
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**Label**
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: A key/value pair conveying user-defined identifying attributes of an object, and used to form sets of related objects, such as
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pods which are replicas in a load-balanced service. Not intended to hold large or non-human-readable data. See [labels](./labels.md).
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**Name**
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: A user-provided name for an object. See [identifiers](identifiers.md).
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**Namespace**
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: A namespace is like a prefix to the name of an object. You can configure your client to use a particular namespace,
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so you do not have to type it all the time. Namespaces allow multiple projects to prevent naming collisions between unrelated teams.
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**Pod**
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: A collection of containers which will be scheduled onto the same node, which share and an IP and port space, and which
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can be created/destroyed together. See [pods](./pods.md).
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**Replication Controller**
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: A _replication controller_ ensures that a specified number of pod "replicas" are running at any one time. Both allows
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for easy scaling of replicated systems, and handles restarting of a Pod when the machine it is on reboots or otherwise fails.
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**Resource**
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: CPU, memory, and other things that a pod can request. See [resources](resources.md).
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**Selector**
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: An expression that matches Labels. Can identify related objects, such as pods which are replicas in a load-balanced
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service. See [labels](labels.md).
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**Service**
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: A load-balanced set of `pods` which can be accessed via a single stable IP address. See [services](./services.md).
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**UID**
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: An identifier on all Kubernetes objects that is set by the Kubernetes API server. Can be used to distinguish between historical
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occurrences of same-Name objects. See [identifiers](identifiers.md).
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**Volume**
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: A directory, possibly with some data in it, which is accessible to a Container as part of its filesystem. Kubernetes
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Volumes build upon [Docker Volumes](https://docs.docker.com/userguide/dockervolumes/), adding provisioning of the Volume
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directory and/or device. See [volumes](volumes.md).
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