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k8s-clu-mon

k8s-clu-mon is a jsonnet library that provides the minimal set of k8s components necessary to collect and forward metrics and logs to an external (outside cluster) destination. By design, storing, analysis and monitoring will take place outside the considered cluster.
The resulting library is intended to be easy to use for monitoring subsequent clusters.

The library uses kube-prometheus with Prometheus Agent and Vector deployed as an agent and aggregator.

Quickstart

Initial project setup (and library versions used)

jb init

echo 'vendor/' >> .gitignore

# k8s-libsonnet version corresponding to the kube-prometheus version in use
jb install github.com/jsonnet-libs/k8s-libsonnet/1.28@main
# see kube-prometheus compatibility at https://github.com/prometheus-operator/kube-prometheus
jb install github.com/prometheus-operator/kube-prometheus/jsonnet/[email protected]
# corresponding to the version of Prometheus Operator (0.67.1) used in the chosen version of kube-prometheus 
jb install github.com/jsonnet-libs/prometheus-operator-libsonnet/0.67@main

# Loki SSD latest working version (3.0.0 doesn't work at the moment) and necessary library
jb install github.com/grafana/loki/production/ksonnet/[email protected]
jb install github.com/grafana/jsonnet-libs/ksonnet-util

# latest version
jb install github.com/jsonnet-libs/docsonnet/[email protected]
# releases are not available
jb install github.com/jsonnet-libs/testonnet@master

Development

Initial versions of the library were prepared on GKE for the opalcbox.pl application, which was deployed on the same platform. Subsequent versions of a library have been developed on kind and on this platform library has been tested.

To analyse returned components check:

jsonnet -J vendor test/experiments.jsonnet | jq 'keys'

To check values generated by debug messages set (global.json).debug to true and use (for example):

./d2j test/experiments.jsonnet main.libsonnet 0

./d2j test/experiments.jsonnet vector.libsonnet 22 | jq 'keys'
./d2j test/experiments.jsonnet vector.libsonnet 23

Search for debug.new in source files for other messages.

make docs generates docs.

make test runs tests.
If necessary use jsonnet -m test/base -J vendor test/base.jsonnet to prepare test/base/* files.
Test cases are not comprehensive, they should rather be treated as proof of concept.

To close the new release:

  • set (global.json).version consistently with the new release tag,
  • make docs to update reference to version tag which was set as above.

Project status

It is the first version, although it has been revised many times needs tunning and extensions.
Some directions of future works include:

  • improving the security of communication between components, eg. in the same way as in the kube-prometheus package
  • hardening Vector components following Hardening Vector
  • better handling data processing failures in Vector components, eg. applying reroute_dropped
  • improving HA by autoscaling aggregators and/or adding pub-sub systems (see Aggregator Architecture)
  • applying blackboxExporter and prometheusAdapter from kube-prometheus package

The library should be updated as new versions of the libraries in use become available.