Kubernetes

Kubernetes service discovery can be used to discover instances using Kuberentes' API.

Agents that run this type of service discovery can operate both outside and within a cluster.

If operating outside of a cluster, ostara.agent.service-discovery.kubernetes.kube-config-path or ostara.agent.service-discovery.kubernetes.kube-config-yaml may be set. If neither are set, it will attempt to find the kube configuration on its own. Additionally, the ostara.agent.service-discovery.namespace must be set.

When operating within a cluster, the agent will use the pod's service account in order to gain access to the cluster, so neither should be set. While a namespace may be set in this approach, if it is not set; the agent will attempt to resolve its own namespace as a last resort. Finally, this type of service discovery becomes active by default when the agent detects it is inside a cluster.

Enabling Discovery

You can enable Kubernetes service discovery in the configuration file by setting ostara.agent.main.kubernetes.enabled to true

When operating inside of Kubernetes, the agent will enable this type of service discovery by default

• Namespace: The namespace will be taken from the underlaying kub it is running on, if you are running the Agent outside of kub, you must configure the namespace.

• Actuator path: by default /actuator will be used, if you have set a custom path, configure it here

• Kub config: The Agent uses the default config if not set, if set kubeConfigYaml takes precedence over kubeConfigPath

• Port: By default if only 1 port is found it will be used, if multiple ports are found we will seek out the port named in the config.

• Pod Labels: Here you can set the K/V for the labels on the Pods you want the Agent return from service discovery.

Configuration Table

Name	Default Value	Description
ostara.agent.service-discovery.kubernetes.enabled	false	Whether Kubernetes service discovery is enabled or not
ostara.agent.service-discovery.kubernetes.kube-config-path	null	The path to the kubeconfig file
ostara.agent.service-discovery.kubernetes.kube-config-yaml	null	The kubeconfig yaml as a string, supersedes kube-config-path if set
ostara.agent.service-discovery.kubernetes.namespace	null	The namespace to search for pods in. Does not need to be set if running in a pod, otherwise mandatory
ostara.agent.service-discovery.kubernetes.actuator-path	/actuator	The context path of actuator
ostara.agent.service-discovery.kubernetes.management-port-name	management	In case actuator running on a different port, the name of the port to seek. If the pod in question only has one port, this field is ignored. If it has more than one but none match this field, the first one is chosen.
ostara.agent.service-discovery.kubernetes.scheme	http	The scheme to use when communicating with the instances
ostara.agent.service-discovery.kubernetes.pod-labels	{}	The pod label selector to filter prospective pods by