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add step for tagging subnets #543

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merged 7 commits into from
Jul 23, 2021
Merged

add step for tagging subnets #543

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9eb59d3
readd step for tagging subnets
geoffcline Jul 23, 2021
e9cc059
Update website/content/en/docs/getting-started/_index.md
geoffcline Jul 23, 2021
931c82d
Update website/content/en/docs/getting-started/_index.md
geoffcline Jul 23, 2021
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Apply suggestions from code review
geoffcline Jul 23, 2021
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Merge branch 'main' into patch-tag-nets
ellistarn Jul 23, 2021
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Update website/content/en/docs/getting-started/_index.md
ellistarn Jul 23, 2021
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Update website/content/en/docs/getting-started/_index.md
ellistarn Jul 23, 2021
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16 changes: 16 additions & 0 deletions website/content/en/docs/getting-started/_index.md
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Expand Up @@ -67,6 +67,22 @@ Karpenter will provision EC2 instances in your account.

Additionally, the configuration file sets up [IAM Roles for Service Accounts](https://docs.aws.amazon.com/emr/latest/EMR-on-EKS-DevelopmentGuide/setting-up-enable-IAM.html) (IRSA), which grants Karpenter permissions like launching instances.

### Tag Subnets

Karpenter discovers subnets tagged `kubernetes.io/cluster/$CLUSTER_NAME`. Add this tag to subnets associated configured for your cluster.
Retreive the subnet IDs and tag them with the cluster name.

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```bash
SUBNET_IDS=$(aws cloudformation describe-stacks \
--stack-name eksctl-${CLUSTER_NAME}-cluster \
--query 'Stacks[].Outputs[?OutputKey==`SubnetsPrivate`].OutputValue' \
--output text)
aws ec2 create-tags \
--resources $(echo $SUBNET_IDS | tr ',' '\n') \
--tags Key="kubernetes.io/cluster/${CLUSTER_NAME}",Value=
```

### Setup an IAM InstanceProfile for your Nodes

Instances launched by Karpenter must run with an InstanceProfile that grants permissions necessary to run containers and configure networking. Karpenter discovers the InstanceProfile using the name `KarpenterNodeRole-${ClusterName}`.
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