{"id":333,"date":"2025-06-23T12:25:47","date_gmt":"2025-06-23T12:25:47","guid":{"rendered":"http:\/\/sreschool.com\/blog\/?p=333"},"modified":"2025-06-23T14:04:16","modified_gmt":"2025-06-23T14:04:16","slug":"comprehensive-tutorial-on-helm-in-the-context-of-devsecops","status":"publish","type":"post","link":"https:\/\/sreschool.com\/blog\/comprehensive-tutorial-on-helm-in-the-context-of-devsecops\/","title":{"rendered":"Comprehensive Tutorial on Helm in the Context of DevSecOps"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\"><strong>1. Introduction &amp; Overview<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">What is Helm?<\/h3>\n\n\n\n<p><strong>Helm<\/strong> is a <strong>package manager for Kubernetes<\/strong> that helps define, install, and manage Kubernetes applications. It simplifies the deployment and lifecycle management of applications by using reusable YAML templates called <em>charts<\/em>. Helm enables repeatable builds, consistent deployments, and version-controlled infrastructure as code (IaC).<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/ctf-cci-com.imgix.net\/4mpa9wPxoZ8GeAFCpoaryl\/9b70f6c2bcd6a93f4692ed3806c4e30e\/2023-03-16-image2.png?ixlib=rb-3.2.1&amp;w=2000&amp;auto=format&amp;fit=max&amp;q=60\" alt=\"\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">History or Background<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Helm 1.0<\/strong> was introduced by Deis (acquired by Microsoft) in 2015.<\/li>\n\n\n\n<li>Evolved through several iterations:\n<ul class=\"wp-block-list\">\n<li>Helm 2 included Tiller (server-side component).<\/li>\n\n\n\n<li>Helm 3 (released in 2019) removed Tiller, improving security and aligning better with Kubernetes RBAC.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Helm is now part of the <strong>Cloud Native Computing Foundation (CNCF)<\/strong>.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Why is It Relevant in DevSecOps?<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Automates <strong>secure<\/strong> application deployment across environments.<\/li>\n\n\n\n<li>Enables <strong>infrastructure as code (IaC)<\/strong>, key for compliance and reproducibility.<\/li>\n\n\n\n<li>Integrates with <strong>CI\/CD pipelines<\/strong> for secure, consistent deployments.<\/li>\n\n\n\n<li>Supports <strong>parameterization<\/strong>, versioning, and <strong>immutable deployments<\/strong>\u2014core DevSecOps principles.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>2. Core Concepts &amp; Terminology<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Key Terms and Definitions<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Term<\/th><th>Description<\/th><\/tr><\/thead><tbody><tr><td><strong>Chart<\/strong><\/td><td>A package of pre-configured Kubernetes resources.<\/td><\/tr><tr><td><strong>Release<\/strong><\/td><td>A running instance of a chart in a Kubernetes cluster.<\/td><\/tr><tr><td><strong>Values.yaml<\/strong><\/td><td>File to customize configurations for templates.<\/td><\/tr><tr><td><strong>Template<\/strong><\/td><td>Go-based templates for Kubernetes manifests.<\/td><\/tr><tr><td><strong>Repository<\/strong><\/td><td>Stores Helm charts. Can be public (ArtifactHub) or private.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">How It Fits Into the DevSecOps Lifecycle<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>DevSecOps Phase<\/th><th>Helm&#8217;s Role<\/th><\/tr><\/thead><tbody><tr><td><strong>Plan<\/strong><\/td><td>Define application structure and required dependencies.<\/td><\/tr><tr><td><strong>Build<\/strong><\/td><td>Package charts as artifacts in CI pipelines.<\/td><\/tr><tr><td><strong>Test<\/strong><\/td><td>Deploy test environments using parameterized charts.<\/td><\/tr><tr><td><strong>Release<\/strong><\/td><td>Push Helm charts to registries and deploy using CD tools.<\/td><\/tr><tr><td><strong>Operate<\/strong><\/td><td>Manage upgrades, rollbacks, and monitor releases.<\/td><\/tr><tr><td><strong>Secure<\/strong><\/td><td>Embed security policies and secrets as part of deployment logic.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>3. Architecture &amp; How It Works<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Components of Helm<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Helm CLI<\/strong>: Interface to interact with Kubernetes using Helm commands.<\/li>\n\n\n\n<li><strong>Charts<\/strong>: Directories containing Kubernetes manifest templates and metadata.<\/li>\n\n\n\n<li><strong>Repositories<\/strong>: Hosts for sharing and storing charts (e.g., ChartMuseum, GitHub).<\/li>\n\n\n\n<li><strong>Kubernetes API Server<\/strong>: Executes actual resource deployment.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Internal Workflow<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>User runs a <code>helm install<\/code> or <code>helm upgrade<\/code>.<\/li>\n\n\n\n<li>Helm CLI renders the templates using <code>values.yaml<\/code>.<\/li>\n\n\n\n<li>Kubernetes manifests are created.<\/li>\n\n\n\n<li>Resources are deployed via the Kubernetes API.<\/li>\n\n\n\n<li>Helm maintains release history in cluster secrets or ConfigMaps.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">Architecture Diagram Description (Textual)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>User\/CI\/CD pipeline<\/strong> \u2192 <strong>Helm CLI<\/strong>\n<ul class=\"wp-block-list\">\n<li>Pulls chart from <strong>Helm Repository<\/strong><\/li>\n\n\n\n<li>Renders templates using <strong>Values.yaml<\/strong><\/li>\n\n\n\n<li>Sends manifests to <strong>Kubernetes API Server<\/strong><\/li>\n\n\n\n<li>Resources get deployed into the <strong>Kubernetes Cluster<\/strong><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img decoding=\"async\" src=\"https:\/\/media2.dev.to\/dynamic\/image\/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fbpthqd6ohrrxisvemmfs.png\" alt=\"\" style=\"width:840px;height:auto\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Integration Points with CI\/CD and Cloud Tools<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Tool<\/th><th>Integration Example<\/th><\/tr><\/thead><tbody><tr><td><strong>GitHub Actions<\/strong><\/td><td>Use Helm in deployment jobs for Kubernetes clusters.<\/td><\/tr><tr><td><strong>GitLab CI\/CD<\/strong><\/td><td>Automate Helm-based releases via <code>helm upgrade<\/code>.<\/td><\/tr><tr><td><strong>Argo CD<\/strong><\/td><td>GitOps-based deployment using Helm charts.<\/td><\/tr><tr><td><strong>Terraform<\/strong><\/td><td>Call Helm charts as modules via <code>helm_release<\/code> resource.<\/td><\/tr><tr><td><strong>AWS\/GCP\/Azure<\/strong><\/td><td>Deploy charts into managed Kubernetes clusters like EKS, GKE, AKS.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>4. Installation &amp; Getting Started<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Basic Setup or Prerequisites<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A running <strong>Kubernetes cluster<\/strong> (minikube, EKS, GKE, etc.)<\/li>\n\n\n\n<li><strong>kubectl<\/strong> CLI installed and configured<\/li>\n\n\n\n<li><strong>Helm 3.x<\/strong> installed<\/li>\n\n\n\n<li>Optional: Docker, Git, and a CI\/CD environment (GitHub Actions\/GitLab)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Hands-On: Step-by-Step Beginner-Friendly Setup<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Step 1: Install Helm<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>curl https:\/\/raw.githubusercontent.com\/helm\/helm\/main\/scripts\/get-helm-3 | bash\n<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">Step 2: Add a Chart Repository<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>helm repo add bitnami https:\/\/charts.bitnami.com\/bitnami\nhelm repo update\n<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">Step 3: Install a Chart<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>helm install my-nginx bitnami\/nginx\n<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">Step 4: List Releases<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>helm list\n<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">Step 5: Upgrade the Release<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>helm upgrade my-nginx bitnami\/nginx --set service.type=LoadBalancer\n<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">Step 6: Uninstall<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>helm uninstall my-nginx\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>5. Real-World Use Cases<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. <strong>Secure Microservice Deployment<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Helm chart templates define Kubernetes resources.<\/li>\n\n\n\n<li>Inject secrets via sealed-secrets or HashiCorp Vault.<\/li>\n\n\n\n<li>Integrate with Snyk or Trivy to scan Helm charts before release.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. <strong>Policy Enforcement in CI\/CD<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use OPA\/Gatekeeper policies embedded in Helm charts.<\/li>\n\n\n\n<li>Ensure security policies are version-controlled.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3. <strong>Environment Replication<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Promote Helm-based releases from dev to staging to prod using GitOps.<\/li>\n\n\n\n<li>Reuse charts with different <code>values.yaml<\/code> files.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">4. <strong>Multi-Tenant SaaS Deployments<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Helm supports templating tenant-specific namespaces, secrets, and configurations.<\/li>\n\n\n\n<li>Automate per-tenant deployments with dynamic values.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>6. Benefits &amp; Limitations<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Key Advantages<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Reusability<\/strong>: Parameterized templates.<\/li>\n\n\n\n<li><strong>Speed<\/strong>: Rapid deployment using declarative definitions.<\/li>\n\n\n\n<li><strong>Version Control<\/strong>: Release history and rollback.<\/li>\n\n\n\n<li><strong>Integration<\/strong>: Works with most CI\/CD and cloud tools.<\/li>\n\n\n\n<li><strong>Security<\/strong>: Encourages separation of concerns (infrastructure vs secrets).<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Common Challenges or Limitations<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Template Complexity<\/strong>: Can be hard to debug.<\/li>\n\n\n\n<li><strong>Limited Validation<\/strong>: Does not enforce schema validation by default.<\/li>\n\n\n\n<li><strong>Secret Management<\/strong>: Native support is weak; best when combined with external tools.<\/li>\n\n\n\n<li><strong>Learning Curve<\/strong>: Requires familiarity with Kubernetes internals.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>7. Best Practices &amp; Recommendations<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Security Tips<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Never hardcode secrets in <code>values.yaml<\/code>; use sealed-secrets or external secret managers.<\/li>\n\n\n\n<li>Enable Helm chart linting using <code>helm lint<\/code>.<\/li>\n\n\n\n<li>Use static analysis tools like <code>kube-score<\/code> or <code>pluto<\/code>.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Performance &amp; Maintenance<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Limit chart complexity\u2014split large charts.<\/li>\n\n\n\n<li>Use chart dependencies wisely to reduce bloat.<\/li>\n\n\n\n<li>Archive deprecated releases.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Compliance &amp; Automation Ideas<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Integrate Helm chart validation into CI workflows.<\/li>\n\n\n\n<li>Include security scanning of templates in pipelines.<\/li>\n\n\n\n<li>Use signed charts to ensure provenance.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>8. Comparison with Alternatives<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Tool<\/th><th>Helm<\/th><th>Kustomize<\/th><th>Terraform<\/th><\/tr><\/thead><tbody><tr><td><strong>Focus<\/strong><\/td><td>Package mgmt<\/td><td>Resource customization<\/td><td>Infra orchestration<\/td><\/tr><tr><td><strong>Declarative<\/strong><\/td><td>\u2705<\/td><td>\u2705<\/td><td>\u2705<\/td><\/tr><tr><td><strong>Templating<\/strong><\/td><td>Go templates<\/td><td>YAML patches<\/td><td>HCL<\/td><\/tr><tr><td><strong>Best Use Case<\/strong><\/td><td>App deployment<\/td><td>Fine-tuning resources<\/td><td>Infra provisioning<\/td><\/tr><tr><td><strong>DevSecOps Fit<\/strong><\/td><td>\u2705 High<\/td><td>\u2705 Medium<\/td><td>\u2705 High<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">When to Choose Helm<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>When deploying <strong>repetitive workloads<\/strong> in Kubernetes.<\/li>\n\n\n\n<li>If <strong>parameterization<\/strong> and <strong>versioning<\/strong> are required.<\/li>\n\n\n\n<li>When working in <strong>multi-environment<\/strong> or <strong>multi-team<\/strong> setups.<\/li>\n\n\n\n<li>For seamless integration with <strong>GitOps<\/strong> and <strong>cloud-native<\/strong> pipelines.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>9. Conclusion<\/strong><\/h2>\n\n\n\n<p>Helm is a powerful enabler for <strong>DevSecOps in Kubernetes environments<\/strong>. It brings together repeatable, secure, and automated deployment patterns that fit neatly into a continuous delivery lifecycle. When combined with GitOps, secrets management, and policy enforcement, Helm strengthens the DevSecOps maturity of any team.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Next Steps<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Explore Helm charts on <a href=\"https:\/\/artifacthub.io\/\">ArtifactHub<\/a><\/li>\n\n\n\n<li>Learn Helm best practices from the <a href=\"https:\/\/helm.sh\/docs\/\">Helm Docs<\/a><\/li>\n\n\n\n<li>Contribute or explore charts on <a href=\"https:\/\/github.com\/helm\/charts\">GitHub Helm Repositories<\/a><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>1. Introduction &amp; Overview What is Helm? Helm is a package manager for Kubernetes that helps define, install, and manage [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-333","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Comprehensive Tutorial on Helm in the Context of DevSecOps - SRE School<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/sreschool.com\/blog\/comprehensive-tutorial-on-helm-in-the-context-of-devsecops\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Comprehensive Tutorial on Helm in the Context of DevSecOps - SRE School\" \/>\n<meta property=\"og:description\" content=\"1. 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