This page describes the resources available to Containers in the Container environment.
The Kubernetes Container environment provides several important resources to Containers:
The hostname of a Container is the name of the Pod in which the Container is running.
It is available through the
hostname command or the
function call in libc.
The Pod name and namespace are available as environment variables through the downward API.
User defined environment variables from the Pod definition are also available to the Container, as are any environment variables specified statically in the Docker image.
A list of all services that were running when a Container was created is available to that Container as environment variables. Those environment variables match the syntax of Docker links.
For a service named foo that maps to a container port named bar, the following variables are defined:
FOO_SERVICE_HOST=<the host the service is running on> FOO_SERVICE_PORT=<the port the service is running on>
Services have dedicated IP addresses and are available to the Container via DNS, if DNS addon is enabled.