Kubernetes

kube-custodian – Kubernetes cleanup tool

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On Kubernetes clusters for development, it’s pretty common to have workloads that become forgotten by developers, holding resources thus potentially voiding new workloads from scheduling.

kube-custodian will mark for later deletion those workloads (Deployments, StatefulSets, Jobs, Pods) lacking --skip-labels unless their namespace has them.

The main subcommand is run, usage help from its Flags section:

$ kube-custodian run --help
Scan Kubernetes objects, mark for deletion (via annotation), delete those already "expired"

Usage:
  kube-custodian run [flags]

Flags:
      --cleanup-tag                Untag resources from later deletion
      --delete-tagged              Delete tagged resources, after their Tag TTL has passed (default true)
      --skip-labels strings        Labels required for resources to be skipped from scanning (default [created_by])
      --skip-namespace-re string   Regex of namespaces to skip, typically 'system' ones and alike (default "kube-.*|.*(-system|monitoring|logging|ingress)")
      --tag-for-deletion           Tag resources for later deletion (default true)
      --tag-ttl string             Time to live after marked, before deletion (default "24h")
[...]
For example, to mark for later deletion all workloads not having the `created_by`
label, run:

```bash
$ kube-custodian -v --namespace=default --dry-run run --tag-ttl 24h --skip-labels created_by

Obviously, remove --dry-run to actually mark them :), it’ll add an annotation as

kube-custodian.bitnami.com/expiration-mark: <current epoch secs>

Then, 24h later same run as above will:

  • Update any new workload without this above annotation
  • Delete all workloads for which:

    (kube-custodian.bitnami.com/expiration-mark + tag-ttl) >= now

Install

Install it from source with:

$ go get github.com/bitnami-labs/kube-custodian

Docker image

You can build your own docker image (docker build -t YOU/kube-custodian .) or use pre-built as:

docker run -it -v $HOME/.kube:/.kube quay.io/jjo/kube-custodian \
  -v --namespace=default --dry-run run --required-labels created_by

Github

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