How to delete helm release older than 1 month - kubernetes-helm

Question

I know I can list all helm release using helm ls --tiller-namespace <tiller-namespace>
What command I can use for deleting helm release old than 1 month ?

Answer 1

You could use the below shell script, that takes all the list of releases and it's last deployed in seconds using the helm ls and jq utility command; which then loops through the releases list and does some subtraction on the number of days it has been deployed and then deletes the releases which are older than a month. By month, I've just given 30 days.
#!/bin/bash
#Store the release names alone for a specific tiller.
helm_releases=(`helm ls --short --tiller-namespace "kube-system"`)
#Store current date
CURRENT_TIME_SECONDS=`date '+%s'`
for RELEASE in ${helm_releases[#]};
do
LAST_DEPLOYED_SECONDS=`helm status $RELEASE --tiller-namespace "kube-system" --output=json | jq -r '.info.last_deployed.seconds'`
SEC_DIFF=`expr $CURRENT_TIME_SECONDS - $LAST_DEPLOYED_SECONDS`
DAY_DIFF=`expr $SEC_DIFF / 86400`
if [ "$DAY_DIFF" -gt 30 ]; then
echo "$RELEASE is older than a month. Proceeding to delete it."
helm delete --purge --no-hooks $RELEASE
fi
done
You can still define your own logic on top of this by calculating the seconds differences for a month.
Please note that I've explicitly mentioned the --tiller-namespace. You can use that if you're releases are deployed in a namespace which uses tiller other than kube-system.