Launching self-managed Bottlerocket nodes

To launch Bottlerocket nodes using eksctl

This procedure requires eksctl version 0.135.0 or later. You can check your version with the following command:

eksctl version

For instructions on how to install or upgrade eksctl, see Installing or updating eksctl.

1. Copy the following contents to your device. Replace my-cluster with the name of your cluster. The name can contain only alphanumeric characters (case-sensitive) and hyphens. It must start with an alphabetic character and can't be longer than 100 characters. Replace ng-bottlerocket with a name for your node group. The node group name can't be longer than 63 characters. It must start with letter or digit, but can also include hyphens and underscores for the remaining characters. To deploy on Arm instances, replace m5.large with an Arm instance type. Replace my-ec2-keypair-name with the name of an Amazon EC2 SSH key pair that you can use to connect using SSH into your nodes with after they launch. If you don't already have an Amazon EC2 key pair, you can create one in the Amazon Web Services Management Console. For more information, see Amazon EC2 key pairs in the Amazon EC2 User Guide for Linux Instances. Replace all remaining example values with your own values. Once you've made the replacements, run the modified command to create the bottlerocket.yaml file.

   If specifying an Arm Amazon EC2 instance type, then review the considerations in Amazon EKS optimized Arm Amazon Linux AMIs before deploying. For instructions on how to deploy using a custom AMI, see Building Bottlerocket on GitHub and Custom AMI support in the eksctl documentation. To deploy a managed node group, deploy a custom AMI using a launch template. For more information, see Customizing managed nodes with launch templates.

   Important

   To deploy a node group to Amazon Outposts, Amazon Wavelength, or Amazon Local Zone subnets, don't pass Amazon Outposts, Amazon Wavelength, or Amazon Local Zone subnets when you create the cluster. You must specify the subnets in the following example. For more information see Create a nodegroup from a config file and Config file schema in the eksctl documentation. Replace region-code with the Amazon Web Services Region that your cluster is in.

   cat >bottlerocket.yaml <<EOF
   ---
   apiVersion: eksctl.io/v1alpha5
   kind: ClusterConfig
   
   metadata:
     name: my-cluster
     region: region-code
     version: '1.25'
   
   iam:
     withOIDC: true
   
   nodeGroups:
     - name: ng-bottlerocket
       instanceType: m5.large
       desiredCapacity: 3
       amiFamily: Bottlerocket
       ami: auto-ssm
       iam:
          attachPolicyARNs:
             - arn:aws-cn:iam::aws:policy/AmazonEKSWorkerNodePolicy
             - arn:aws-cn:iam::aws:policy/AmazonEC2ContainerRegistryReadOnly
             - arn:aws-cn:iam::aws:policy/AmazonSSMManagedInstanceCore
             - arn:aws-cn:iam::aws:policy/AmazonEKS_CNI_Policy
       ssh:
           allow: true
           publicKeyName: my-ec2-keypair-name
   EOF

2. Deploy your nodes with the following command.

   eksctl create nodegroup --config-file=bottlerocket.yaml
   

   The example output is as follows.

   Several lines are output while the nodes are created. One of the last lines of output is the following example line.

   [✔]  created 1 nodegroup(s) in cluster "my-cluster"

3. (Optional) Create a Kubernetes persistent volume on a Bottlerocket node using the Amazon EBS CSI Plugin. The default Amazon EBS driver relies on file system tools that aren't included with Bottlerocket. For more information about creating a storage class using the driver, see Amazon EBS CSI driver.

4. (Optional) By default, kube-proxy sets the nf_conntrack_max kernel parameter to a default value that may differ from what Bottlerocket originally sets at boot. To keep Bottlerocket's default setting, edit the kube-proxy configuration with the following command.

   kubectl edit -n kube-system daemonset kube-proxy
   

   Add --conntrack-max-per-core and --conntrack-min to the kube-proxy arguments that are in the following example. A setting of 0 implies no change.

         containers:
         - command:
           - kube-proxy
           - --v=2
           - --config=/var/lib/kube-proxy-config/config
           - --conntrack-max-per-core=0
           - --conntrack-min=0

5. (Optional) Deploy a sample application to test your Bottlerocket nodes.

6. We recommend blocking pod access to IMDS if the following conditions are true:

   • You plan to assign IAM roles to all of your Kubernetes service accounts so that pods only have the minimum permissions that they need.

   • No pods in the cluster require access to the Amazon EC2 instance metadata service (IMDS) for other reasons, such as retrieving the current Amazon Web Services Region.

   For more information, see Restrict access to the instance profile assigned to the worker node.