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Merge pull request #9867 from marekbiskup/doc-overview 

clarification of name uniqueness
pull/6/head
Saad Ali 2015-06-16 14:02:06 -07:00
parent 591132f4ae aa0c816d9f
commit d5b40de7b4
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@ -14,7 +14,7 @@ Kubernetes supports a unique [networking model](networking.md). Kubernetes encou
Modern Internet applications are commonly built by layering micro-services, for example a set of web front-ends talking to a distributed in-memory key-value store talking to a replicated storage service. To facilitate this architecture, Kubernetes offers the [service](services.md) abstraction, which provides a stable IP address and [DNS name](dns.md) that corresponds to a dynamic set of pods such as the set of pods constituting a micro-service. The set is defined using a label selector and thus can refer to any set of pods. When a container running in a Kubernetes pod connects to this address, the connection is forwarded by a local agent (called the kube proxy) running on the source machine, to one of the corresponding back-end containers. The exact back-end is chosen using a round-robin policy to balance load. The kube proxy takes care of tracking the dynamic set of back-ends as pods are replaced by new pods on new hosts, so that the service IP address (and DNS name) never changes.
Every resource in Kubernetes, such as a pod, is identified by a URI and has a UID. Important components of the URI are the kind of object (e.g. pod), the object’s name, and the object’s [namespace](namespaces.md). Every name is unique within its namespace, and in contexts where an object name is provided without a namespace, it is assumed to be in the default namespace. UID is unique across time and space.
Every resource in Kubernetes, such as a pod, is identified by a URI and has a UID. Important components of the URI are the kind of object (e.g. pod), the object’s name, and the object’s [namespace](namespaces.md). For a certain object kind, every name is unique within its namespace. In contexts where an object name is provided without a namespace, it is assumed to be in the default namespace. UID is unique across time and space.
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