Script in bottlerocket user-data

[ghost]

Hi,
I am using bottlerocket AMI in AWS. The nodes are successfully joinig the cluster, now I have to place some custom node label, that will contain availability zone nome in it. Example:
nodeGroup-bottlerocket-us-east-1a.
With Amazon LInux AMI i run the curl request to metadata:
ENI_CONFIG=${NODE_TYPE}-$(curl 169.254.169.254/latest/meta-data/placement/availability-zone)

/etc/eks/bootstrap.sh \
    --b64-cluster-ca '${B64_CLUSTER_CA}' \
    --apiserver-endpoint '${API_SERVER_URL}' ${bootstrap_extra_args} \
    --kubelet-extra-args "--node-labels=node.eniconfig/configname=$${ENI_CONFIG}" '${CLUSTER_NAME}'

is there any way to run script in bottlerocket and put the AZ-specific label?

[bcressey]

Today there's no way to do exactly what you're asking for, outside of a custom build.

We do have the ability to populate settings based on a template at runtime; that's how host containers are configured to pull from the regional ECR repository. However, there's not currently a way to define new templates or override them via user-data.

We're also in the early stages of designing a "bootstrap container" interface that would let you run a script inside a container during first boot, so you could do something like this:

INSTANCE_TYPE="$(curl -s http://169.254.169.254/latest/meta-data/instance-type)"
AZ="$(curl -s http://169.254.169.254/latest/meta-data/placement/availability-zone)"
apiclient set --json '{"kubernetes":{"node-labels":{"node.eniconfig/configname":"'${INSTANCE_TYPE}-${AZ}'"}}}'

For your use case, could you work with a combination of two labels instead? node.kubernetes.io/instance-type and topology.kubernetes.io/zone are set by default and have the data you're after, though not in the same label.

[bcressey]

Bootstrap containers are now available as of the 1.0.8 release, so you'd be able to use a script like the one above to add a dynamically generated label to the settings.