Bottlerocket - SelfManaged NodeGroup - extra parameter issue

[adrianmiron]

Hi,

I am facing a weird issue when trying to add the following parameters to bottlerocket via bootstrap_extra_args .

This works fine :

      bootstrap_extra_args = <<-EOT
        [settings.host-containers.admin]
        enabled = true

        [settings.host-containers.control]
        enabled = true

        [settings.kubernetes.node-labels]
        "nodegroup" = "stable"
        "eks-cluster-name" = "tf-eks-devops-ontario"

        [settings.kubernetes.kube-reserved]
        cpu = "100m"
        memory = "300Mi"
        ephemeral-storage = "1Gi"

        [settings.kubernetes.system-reserved]
        cpu = "100m"
        ephemeral-storage = "1Gi"
        memory = "100Mi"

        [settings.kubernetes.eviction-hard]
        "memory.available" = "200Mi"
        "nodefs.available" = "5%"

      EOT

Adding the last argument block, as seen in the feature PR ( https://github.com/bottlerocket-os/bottlerocket/pull/2930 ) , causes kubelet to fail, the node does not join the cluster, SSM does not start so i can test the issue....

     bootstrap_extra_args = <<-EOT
        [settings.host-containers.admin]
        enabled = true

        [settings.host-containers.control]
        enabled = true

        [settings.kubernetes.node-labels]
        "nodegroup" = "stable"
        "eks-cluster-name" = "tf-eks-devops-ontario"

        [settings.kubernetes.kube-reserved]
        cpu = "100m"
        memory = "300Mi"
        ephemeral-storage = "1Gi"

        [settings.kubernetes.system-reserved]
        cpu = "100m"
        ephemeral-storage = "1Gi"
        memory = "100Mi"

        [settings.kubernetes.eviction-hard]
        "memory.available" = "200Mi"
        "nodefs.available" = "5%"

        [settings.kubernetes]
        "shutdown-grace-period" = "60s"

      EOT

If i start the node without that argument and do apiclient set settings.kubernetes.shutdown-grace-period=60s it acccepts the command .

This is only for selfmanaged nodegroups, Karpenter managed nodes with this setting work fine.

Anyone else seen this ? I have no clue what crazy magic is causing this ....

[adrianmiron]

Ok, i got it.... It was because of the LaunchTemplate which adds some default fields

[settings.kubernetes]
"cluster-name" = "****"
"api-server" = "*********eks.amazonaws.com"
"cluster-certificate" = "*******"
"cluster-dns-ip" = ["10.100.0.10"]

So adding another [settings.kubernetes] block lower in the template caused it to fail; this worked though :

     bootstrap_extra_args = <<-EOT
        "shutdown-grace-period" = "60s"
        "shutdown-grace-period-for-critical-pods" = "30s"

        [settings.host-containers.admin]
        enabled = true

        [settings.host-containers.control]
        enabled = true

        [settings.kubernetes.node-labels]
        "nodegroup" = "stable"
        "eks-cluster-name" = "tf-eks-devops-ontario"

        [settings.kubernetes.kube-reserved]
        cpu = "100m"
        memory = "300Mi"
        ephemeral-storage = "1Gi"

        [settings.kubernetes.system-reserved]
        cpu = "100m"
        ephemeral-storage = "1Gi"
        memory = "100Mi"

        [settings.kubernetes.eviction-hard]
        "memory.available" = "200Mi"
        "nodefs.available" = "5%"

      EOT

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