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Khan - Pod Connection Tracking Metrics Exporter

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Khan captures connection tracking snapshots on Pods, and Nodes and exposes them as prometheus metrics. Note that the metrics don't constitute realtime connection info, only snapshots that are polled with a default period of 30s.

The use case for this application is for tracking down pods/services that are leaking connections or finding an unknown client that is overloading a server.

This application is composed of a 'controller' that runs as a deployment. The controller is mainly an API for the node agents to retrieve mappings of IP-to-pod for IPs found in the conntrack table. The 'agent' runs as a daemonset on each node and captures the conntrack table and converts it to a set of prometheus metrics.

Metrics

There is one metric exposed, 'khan_connection' which is a counter. The following labels are included with this metric:

  • node: Node name of the host the agent is running on
  • src_type: This is the type of host for source of the connection. It depends on a mapping of the source IP address to a specific type. Possible values are:
    • pod: mapped by pod IP
    • service: mapped by cluster IP
    • node: mapped by node IP
    • network: tied to overlay network (flannel). depends on nodes containing podCIDR. network address of podCIDR becomes the mapped address
    • gateway: mapped to gateway address. also depends on nodes containing podCIDR. currently, first address of podCIDR (x.x.x.1) becomes the mapped address
  • src_ip: IP of the source of the connection
  • src_ns: Source namespace (pods and services only) of the source of the connection
  • src_app: Value of the label 'app' for the source pod or service
  • src_name: Name for the source of connection
  • dst_type: This is the type of host for destination of the connection. It depends on a mapping of the destination IP address to a specific type. Possible values are same as src_type
  • dst_ip: IP of the destination of the connection
  • dst_ns: Source namespace (pods and services only) of the source of the connection
  • dst_app: Value of the label 'app' for the destination pod or service
  • dst_name: Name for the destination of connection

Additional info

Maintained and in-use by the Platform Team @ AT&T Entertainment Cloud Native Labs.

Distributed under the AT&T MIT license. See LICENSE for more information.