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update faq for getting nodegroup's userdata and launch templates #8197

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update faq for getting nodegroup's userdata and launch templates #8197

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11 changes: 1 addition & 10 deletions userdocs/src/usage/faq.md
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Original file line number Diff line number Diff line change
Expand Up @@ -13,20 +13,11 @@
To change the instance type, create a new nodegroup with the desired instance type, then drain it so that the workloads move to the new one. After that step is complete you can delete the old nodegroup

???+ question "How can I see the generated userdata for a nodegroup?"
First you'll need the name of the Cloudformation stack that manages the
nodegroup:
```console
$ eksctl utils describe-stacks --region=us-west-2 --cluster NAME
```
You'll see a name similar to `eksctl-CLUSTER_NAME-nodegroup-NODEGROUP_NAME`.

You can execute the following to get the userdata. Note the final line which
decodes from base64 and decompresses the gzipped data.
```bash
NG_STACK=eksctl-scrumptious-monster-1595247364-nodegroup-ng-29b8862f # your stack here
LAUNCH_TEMPLATE_ID=$(aws cloudformation describe-stack-resources --stack-name $NG_STACK \
| jq -r '.StackResources | map(select(.LogicalResourceId == "NodeGroupLaunchTemplate")
| .PhysicalResourceId)[0]')
LAUNCH_TEMPLATE_ID=$(aws ec2 describe-launch-templates --filters "Name=tag:eks:cluster-name,Values=CLUSTER_NAME" --filters "Name=tag:eks:nodegroup-name,Values=NODEGROUP_NAME" | jq -r '.LaunchTemplates[0].LaunchTemplateId' )
aws ec2 describe-launch-template-versions --launch-template-id $LAUNCH_TEMPLATE_ID \
| jq -r '.LaunchTemplateVersions[0].LaunchTemplateData.UserData' \
| base64 -d | gunzip
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