High number of Tokens on Rancher Manager

This document (000021439) is provided subject to the disclaimer at the end of this document.

Environment

SUSE Rancher 2.6.x
SUSE Rancher 2.7.x

Situation

Rancher 2.6.x and 2.7.x do not have a default expiration time for tokens. This can lead to excessive tokens created and impact Rancher performance.
The number of tokens can be checked running:

kubectl get tokens | wc -l

Resolution

You should have minimized the number of tokens. Anything over 5000 could impact the performance.
You can get the tokens by running:

kubectl get tokens -o jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.metadata.creationTimestamp}{"\n"}'

Export that to a file and sort it by the desired date.

You can then pass the file to a script like this one. This will delete all the tokens in the file:

#!/bin/bash

TOKENS_FILENAME=$1

while IFS= read -r line
do
  token=($line)
  kubectl patch tokens.management.cattle.io/$token \
    --type json \
    --patch='[ { "op": "remove", "path": "/metadata/finalizers" } ]'
  kubectl delete token $token
done < "$TOKENS_FILENAME"

Disclaimer

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