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Kubelet monitoring with Netdata

Kubelet is an agent that runs on each node in the cluster. It makes sure that containers are running in a pod.

This module will monitor one or more kubelet instances, depending on your configuration.

Charts

It produces the following charts:

  • API Server Audit Requests in requests/s
  • API Server Failed Data Encryption Key(DEK) Generation Operations in events/s
  • API Server Latencies Of Data Encryption Key(DEK) Generation Operations in observes/s
  • API Server Latencies Of Data Encryption Key(DEK) Generation Operations Percentage in %
  • API Server Storage Envelope Transformation Cache Missesinevents/s`
  • Number Of Containers Currently Running in containers
  • Number Of Pods Currently Running in pods
  • Bytes Used By The Pod Logs On The Filesystem in bytes
  • Runtime Operations By Type in operations/s
  • Docker Operations By Type in operations/s
  • Docker Operations Errors By Type in operations/s
  • Node Configuration-Related Error in bool
  • PLEG Relisting Interval Summary in microseconds
  • PLEG Relisting Latency Summary in microseconds
  • Token Requests To The Alternate Token Source in requests/s
  • REST Client HTTP Requests By Status Code in requests/s
  • REST Client HTTP Requests By Method in requests/s

Per every plugin:

  • Volume Manager State Of The World in state

Configuration

Edit the go.d/k8s_kubelet.conf configuration file using edit-config from the Netdata config directory, which is typically at /etc/netdata.

cd /etc/netdata # Replace this path with your Netdata config directory
sudo ./edit-config go.d/k8s_kubelet.conf

Needs only url to kubelet metric-address. Here is an example for 2 instances:

jobs:
- name: local
url: http://127.0.0.1:10255/metrics

- name: remote
url: http://203.0.113.10:10255/metrics

For all available options please see module configuration file.

Troubleshooting

To troubleshoot issues with the k8s_kubelet collector, run the go.d.plugin with the debug option enabled. The output should give you clues as to why the collector isn't working.

  • Navigate to the plugins.d directory, usually at /usr/libexec/netdata/plugins.d/. If that's not the case on your system, open netdata.conf and look for the plugins setting under [directories].

    cd /usr/libexec/netdata/plugins.d/
  • Switch to the netdata user.

    sudo -u netdata -s
  • Run the go.d.plugin to debug the collector:

    ./go.d.plugin -d -m k8s_kubelet

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