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alb-controller-custom-sg-narrowing-inert

v1.0.0

Recognize and fix the trap where supplying a custom security group to an AWS Load Balancer Controller ingress (annotation alb.ingress.kubernetes.io/security-groups) delivers NO security narrowing, because the controller's shared backend SG stays attached and security groups are additive. Use when: (1) a "narrow the ALB's security groups" change applied clean but the ALB still carries a controller-managed SG (tag elbv2.k8s.aws/resource=backend-sg) with all-protocol 0.0.0.0/0 egress, (2) you are reviewing a diff that adds a custom SG to an ingress while alb.ingress.kubernetes.io/manage-backend-security-group-rules is "true", (3) after doing the narrowing properly, new backends go "unhealthy: Target.Timeout" because the health-check port was never opened, (4) a terraform apply that flips the annotation and adds replacement node-SG rules could race and close the front door mid-apply. Core facts: effective SG posture is the UNION of attached SGs - adding a narrow SG beside a broad one changes nothing; the real fix is to stop the controller attaching/managing the backend SG and author the node-side rules yourself, with explicit depends_on ordering; measure the live SGs before and after, never trust the diff.

Claude Code

By voitta-aiLicense: MIT3 GitHub starsUpdated 2 hours ago

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Claude Code
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Source updated
Sep 28, 2026
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Install alb-controller-custom-sg-narrowing-inert for Claude Code

Installs for the current user
claude plugin marketplace add IchenDEV/agent-plugin-mkt
claude plugin marketplace update agent-plugin-marketplace
claude plugin install alb-controller-custom-sg-narrowing-inert@agent-plugin-marketplace

Paste and run these commands in a terminal with Claude Code. They add and refresh the PluginsMP catalog, then install this plugin.

The installer fetches third-party code from the source repository shown on this page. This directory validates manifest structure and source location, but does not perform a security audit; review the manifest, components, and source before installing.

Get the source manually
git clone https://github.com/voitta-ai/skillz

Clone the source repository, then follow its setup instructions to add the plugin to a compatible client. The plugin root is plugins/alb-controller-custom-sg-narrowing-inert/.

Plugin files

plugins/alb-controller-custom-sg-narrowing-inert/
└── .claude-plugin/plugin.json

Plugin manifests1

plugins/alb-controller-custom-sg-narrowing-inert/.claude-plugin/plugin.json
{
  "name": "alb-controller-custom-sg-narrowing-inert",
  "description": "Recognize and fix the trap where supplying a custom security group to an AWS Load Balancer Controller ingress (annotation alb.ingress.kubernetes.io/security-groups) delivers NO security narrowing, because the controller's shared backend SG stays attached and security groups are additive. Use when: (1) a \"narrow the ALB's security groups\" change applied clean but the ALB still carries a controller-managed SG (tag elbv2.k8s.aws/resource=backend-sg) with all-protocol 0.0.0.0/0 egress, (2) you are reviewing a diff that adds a custom SG to an ingress while alb.ingress.kubernetes.io/manage-backend-security-group-rules is \"true\", (3) after doing the narrowing properly, new backends go \"unhealthy: Target.Timeout\" because the health-check port was never opened, (4) a terraform apply that flips the annotation and adds replacement node-SG rules could race and close the front door mid-apply. Core facts: effective SG posture is the UNION of attached SGs - adding a narrow SG beside a broad one changes nothing; the real fix is to stop the controller attaching/managing the backend SG and author the node-side rules yourself, with explicit depends_on ordering; measure the live SGs before and after, never trust the diff.",
  "version": "1.0.0",
  "author": {
    "name": "voitta-ai"
  },
  "homepage": "https://github.com/voitta-ai/skillz",
  "repository": "https://github.com/voitta-ai/skillz",
  "license": "MIT",
  "skills": "./skills/"
}

For maintainers

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[alb-controller-custom-sg-narrowing-inert on Agent Plugins Marketplace](https://pluginsmp.com/plugins/alb-controller-custom-sg-narrowing-inert)