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K8s Object Dumper

Discover and dump all listable objects from a Kubernetes cluster into JSON files. Written to be used as a pre backup command for K8up.

Usage

The project uses controller-runtime's configuration discovery to find the Kubernetes API server.

Dump to STDOUT

$ k8s-object-dumper
{"apiVersion":"v1","kind":"List","items":[{"apiVersion":"v1", ...}]}
{"apiVersion":"v1","kind":"List","items":[{"apiVersion":"apps/v1", ...}]}

Dump to a directory

$ k8s-object-dumper -dir dir

Will result in the following directory structure:

└─ dir/
   ├─ objects-<kind>[.<group>].json
   ├─ …
   └─ split/
      ├─ <namespace>/
      |  ├─ __all__.json
      |  ├─ <kind>[.<group>].json
      |  └─ …
      └─ …

Advanced usage

# Fail if a Pods, Deployments or AlertingRules are not found
$ k8s-object-dumper \
  -must-exist=pods \
  -must-exist=deployments.apps \
  -must-exist=alertingrules.monitoring.openshift.io
# Ignore all Secrets and all cert-manager objects
$ k8s-object-dumper \
  -ignore=secrets \
  -ignore=.+cert-manager.io

Development

The project uses envtest to run tests against a real Kubernetes API server.

$ make test

Differences to the original bash version < 0.3.0

  • All APIs are fully qualified in both the options (--must-exist=certificates.cert-manager.io, --ignore=deployment.apps) and the output files (objects-Certificate.cert-manager.io.json). This makes it possible to distinguish between objects with the same kind but different groups. See #47.
  • Resources without a list endpoint are ignored, do not cause an error, and don't need to be explicitly ignored.
  • Ignore and must-exist options are now command line flags instead of files in /usr/local/share.

Contributing and license

This library is licensed under BSD-3-Clause. For information about how to contribute see CONTRIBUTING.