<h1>Question</h1>

<p>What is the purpose of the K8S_HOST_URL configuration parameter in EFK? In EFK, K8S_HOST_URL exists as an environment variable and it looks being used to communicate to the Kubernetes API server by fluentd as being specified in the <a href="https://github.com/openshift/origin-aggregated-logging/blob/877d84296ce113fbafca6177612741054ed5a584/fluentd/configs.d/openshift/filter-k8s-meta.conf" rel="nofollow noreferrer">filter-k8s-meta.conf</a> of the fluentd configuration.</p>

<p>Looking for the documentation but not in the OpenShift <a href="https://docs.openshift.com/container-platform/3.4/install_config/aggregate_logging.html" rel="nofollow noreferrer">Aggregating Container Logs</a> documentation. Searched in Google but could not find a definite answer.</p>

<p>Please suggest the documentation which explains in detail. </p>

<h2>From RHEL</h2>

<p>The environment variable K8S_HOST_URL in fluend is an internal url for reaching the master API. Not documented yet.</p>
