This folder contains helper scripts for running an EKS Cluster, including:
map-ec2-tags-to-node-labels: This script will pull the associated tags on the EC2 instance and convert it into a
format that can be passed into the EKS node bootstrap script to set the node labels as the tags.
This script will read in the EC2 tags from the metadata API and convert it to a string of comma separated key=value
pairs, outputting the result to stdout.
Note: unlike EC2 tags, Kubernetes node labels have the following restrictions on BOTH keys and labels:
Must be 63 characters or less
Begin and end with an alphanumeric character ([a-zA-Z0-9])
Only contain dashes (-), underscores (_), dots (.), and alphanumeric characters ([a-zA-Z0-9])
As such, this script will convert the EC2 tags to fit the scheme above. Notably, this script will:
Take all unsupported characters and replace them with dashes (-). E.g if you have a EC2 tag with key foo@bar, this
will be converted to foo-bar.
Truncate keys and values to 63 characters.
Namespace the labels with the prefix ec2.amazonaws.com. E.g if you have a EC2 tag with key foo, this will be
registered under the key ec2.amazonaws.com/foo in Kubernetes.
Finally, this script will log all conversions to stderr so it can be traced and referenced.
IAM Role
In order for the script to be able to successfully retrieve the tags for EC2 instance, the instances need to be
associated with an IAM profile that grants it access to retrieve the EC2 tags on the instance. If you launch the workers
using the eks-cluster-workers module, this is automatically attached to the worker IAM role.
map_ec2_tags_to_node_labels.py symlink
Due to limitations in how python imports scripts, this module includes a symlink that maps
map_ec2_tags_to_node_labels.py to the map-ec2-tags-to-node-labels script so that it can be imported in the unit
tests.
Questions? Ask away.
We're here to talk about our services, answer any questions, give advice, or just to chat.
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class=\"preview__body--title\" id=\"eks-scripts-module\">EKS Scripts Module</h1><div class=\"preview__body--border\"></div><p>This folder contains helper scripts for running an EKS Cluster, including:</p>\n<ul>\n<li><code>map-ec2-tags-to-node-labels</code>: This script will pull the associated tags on the EC2 instance and convert it into a\nformat that can be passed into the EKS node bootstrap script to set the node labels as the tags.</li>\n</ul>\n<h2 class=\"preview__body--subtitle\" id=\"installing-the-helpers\">Installing the helpers</h2>\n<p>You can install the helpers using the <a href=\"/repos/gruntwork-installer\" class=\"preview__body--description--blue\">Gruntwork Installer</a>:</p>\n<pre><span class=\"hljs-string\">gruntwork-install </span><span class=\"hljs-built_in\">--module-name</span> <span class=\"hljs-string\">\"eks-scripts\"</span> <span class=\"hljs-built_in\">--repo</span> <span class=\"hljs-string\">\"https://github.com/gruntwork-io/terraform-aws-eks\"</span> <span class=\"hljs-built_in\">--tag</span> <span class=\"hljs-string\">\"0.2.0\"</span>\n</pre>\n<p>For an example, see the <a href=\"https://www.packer.io/\" class=\"preview__body--description--blue\" target=\"_blank\">Packer</a> template under\n<a href=\"/repos/v0.32.3/terraform-aws-eks/examples/eks-cluster-with-supporting-services/packer/build.json\" class=\"preview__body--description--blue\">examples/eks-cluster-with-supporting-services/packer/build.json</a>.</p>\n<h2 class=\"preview__body--subtitle\" id=\"using-the-map-ec-2-tags-to-node-labels-helper\">Using the map-ec2-tags-to-node-labels helper</h2>\n<p>The <code>map-ec2-tags-to-node-labels</code> script will take <a href=\"https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/Using_Tags.html\" class=\"preview__body--description--blue\" target=\"_blank\">EC2 instance\ntags</a> and format them for use as Kubernetes Node\nLabels, which <a href=\"https://kubernetes.io/docs/concepts/configuration/assign-pod-node/\" class=\"preview__body--description--blue\" target=\"_blank\">play an integral role in having control over assigning which nodes Pods should be scheduled\non</a>.</p>\n<p>This script has the following prerequisites:</p>\n<ol>\n<li>It must be run on an EC2 instance.</li>\n<li>The EC2 instance must be running an <a href=\"https://aws.amazon.com/marketplace/pp/B00U6QTYI2/\" class=\"preview__body--description--blue\" target=\"_blank\">Amazon EKS-optimized AMI</a>.</li>\n<li>The EC2 instance must have the AWS CLI installed.</li>\n<li>The EC2 instance must have a version of Python installed.</li>\n</ol>\n<p>When you run the script, the script will output the node label argument to stdout. You can then pass this output to the\nbootstrap script:</p>\n<pre>NODE_LABELS=<span class=\"hljs-string\">\"$(map-ec2-tags-to-node-labels)\"</span>\n/etc/eks/<span class=\"hljs-keyword\">bootstrap</span>.<span class=\"hljs-keyword\">sh</span> \\\n --apiserver-endpoint <span class=\"hljs-string\">\"$EKS_ENDPOINT\"</span> \\\n --b64-<span class=\"hljs-keyword\">cluster</span>-<span class=\"hljs-keyword\">ca</span> <span class=\"hljs-string\">\"$EKS_CERTIFICATE_AUTHORITY\"</span> \\\n --kubelet-extra-<span class=\"hljs-keyword\">args</span> <span class=\"hljs-string\">\"--node-labels=\\\"</span><span class=\"hljs-variable\">$NODE_LABELS</span>\\<span class=\"hljs-string\">\"\"</span> \\\n <span class=\"hljs-string\">\"$EKS_CLUSTER_NAME\"</span>\n</pre>\n<p>This script will read in the EC2 tags from the metadata API and convert it to a string of comma separated key=value\npairs, outputting the result to stdout.</p>\n<p>Note: unlike EC2 tags, Kubernetes node labels have the following restrictions on BOTH keys and labels:</p>\n<ul>\n<li>Must be 63 characters or less</li>\n<li>Begin and end with an alphanumeric character (<code>[a-zA-Z0-9]</code>)</li>\n<li>Only contain dashes (<code>-</code>), underscores (<code>_</code>), dots (<code>.</code>), and alphanumeric characters (<code>[a-zA-Z0-9]</code>)</li>\n</ul>\n<p>As such, this script will convert the EC2 tags to fit the scheme above. Notably, this script will:</p>\n<ul>\n<li>Take all unsupported characters and replace them with dashes (<code>-</code>). E.g if you have a EC2 tag with key <code>foo@bar</code>, this\nwill be converted to <code>foo-bar</code>.</li>\n<li>Truncate keys and values to 63 characters.</li>\n<li>Namespace the labels with the prefix <code>ec2.amazonaws.com</code>. E.g if you have a EC2 tag with key <code>foo</code>, this will be\nregistered under the key <code>ec2.amazonaws.com/foo</code> in Kubernetes.</li>\n</ul>\n<p>Finally, this script will log all conversions to stderr so it can be traced and referenced.</p>\n<h3 class=\"preview__body--subtitle\" id=\"iam-role\">IAM Role</h3>\n<p>In order for the script to be able to successfully retrieve the tags for EC2 instance, the instances need to be\nassociated with an IAM profile that grants it access to retrieve the EC2 tags on the instance. If you launch the workers\nusing the <a href=\"/repos/v0.32.3/terraform-aws-eks/modules/eks-cluster-workers\" class=\"preview__body--description--blue\">eks-cluster-workers module</a>, this is automatically attached to the worker IAM role.</p>\n<h3 class=\"preview__body--subtitle\" id=\"map-ec-2-tags-to-node-labels-py-symlink\">map_ec2_tags_to_node_labels.py symlink</h3>\n<p>Due to limitations in how python imports scripts, this module includes a symlink that maps\n<code>map_ec2_tags_to_node_labels.py</code> to the <code>map-ec2-tags-to-node-labels</code> script so that it can be imported in the unit\ntests.</p>\n","repoName":"terraform-aws-eks","repoRef":"v0.22.0","serviceDescriptor":{"serviceName":"EC2 Kubernetes Service (EKS) Cluster","serviceRepoName":"terraform-aws-eks","serviceRepoOrg":"gruntwork-io","cloudProviders":["aws"],"description":"Deploy a Kubernetes cluster on top of Amazon EC2 Kubernetes Service (EKS).","imageUrl":"eks.png","licenseType":"subscriber","technologies":["Terraform","Python","Bash"],"compliance":[],"tags":[""]},"serviceCategoryName":"Docker orchestration","fileName":"README.md","filePath":"/modules/eks-scripts","title":"Repo Browser: EC2 Kubernetes Service (EKS) Cluster","description":"Browse the repos in the Gruntwork Infrastructure as Code Library."}
.circleci
dev_requirements.txt
