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LAB10 Report - Helm Package Manager

Summary

Lab 10 implementation is completed in this repository with:

  • Helm 4 CLI verification and public chart exploration.
  • Conversion of Lab 9 app manifests into Helm charts.
  • Multi-environment values (dev and prod).
  • Helm pre-install and post-install hooks.
  • Bonus library chart with shared templates used by two app charts.

Main deliverables:

  • k8s/devops-info (primary app chart)
  • k8s/hello-app (second app chart for bonus)
  • k8s/common-lib (library chart)
  • k8s/HELM.md (implementation documentation)

Checklist Coverage

Task 1 - Helm Fundamentals (2 pts)

  • Helm installed and verified
  • Chart repositories explored
  • Helm concepts understood
  • Documentation of setup

Evidence:

$ .tools/helm version
version.BuildInfo{Version:"v4.0.0", GitCommit:"99cd1964357c793351be481d55abbe21c6b2f4ec", ...}

$ .tools/helm repo list
NAME                    URL
prometheus-community    https://prometheus-community.github.io/helm-charts

$ .tools/helm search repo prometheus-community/prometheus
prometheus-community/prometheus  28.14.1  v3.10.0  Prometheus is a monitoring system...

$ .tools/helm show chart prometheus-community/prometheus
apiVersion: v2
name: prometheus
version: 28.14.1
...

Helm value proposition (brief):

Helm provides reusable, versioned, and configurable Kubernetes application packaging. It eliminates static manifest duplication through templates and values files, supports lifecycle management with hooks, and enables safe upgrades/rollbacks.

Task 2 - Create Your Helm Chart (3 pts)

  • Chart created in k8s/ directory
  • Chart.yaml properly configured
  • Manifests converted to templates
  • Values properly extracted
  • Helper templates implemented
  • Health checks remain functional (not commented out)
  • Chart installs successfully (validated via dry-run)

Implemented chart:

  • k8s/devops-info

Converted resources:

  • Deployment: k8s/devops-info/templates/deployment.yaml
  • Service: k8s/devops-info/templates/service.yaml

Health checks:

  • livenessProbe, readinessProbe, startupProbe are all active and configurable via values.yaml (probes.*).

Validation evidence:

$ .tools/helm lint k8s/devops-info
1 chart(s) linted, 0 chart(s) failed

$ .tools/helm template devops-info k8s/devops-info
# Service + Deployment + Hooks rendered

$ .tools/helm install --dry-run --debug test-devops k8s/devops-info -f k8s/devops-info/values-dev.yaml
STATUS: pending-install
DESCRIPTION: Dry run complete

Task 3 - Multi-Environment Support (2 pts)

  • values-dev.yaml created
  • values-prod.yaml created
  • Environment-specific configurations
  • Both environments tested (render + dry-run)
  • Documentation of differences

Files:

  • k8s/devops-info/values-dev.yaml
  • k8s/devops-info/values-prod.yaml

Environment differences implemented:

  • Dev: 1 replica, lighter resources, NodePort, image tag latest.
  • Prod: 5 replicas, stronger resources, LoadBalancer, image tag lab02.

Evidence:

$ .tools/helm template devops-info-dev k8s/devops-info -f k8s/devops-info/values-dev.yaml
# replicas: 1
# image: graymansion/devops-info-service:latest
# service.type: NodePort

$ .tools/helm template devops-info-prod k8s/devops-info -f k8s/devops-info/values-prod.yaml
# replicas: 5
# image: graymansion/devops-info-service:lab02
# service.type: LoadBalancer

Task 4 - Chart Hooks (3 pts)

  • Pre-install hook implemented
  • Post-install hook implemented
  • Proper hook annotations
  • Hook weights configured
  • Deletion policies applied
  • Hooks execute successfully (validated in dry-run render path)
  • Hooks deleted per policy (requires live cluster run)

Hook files:

  • k8s/devops-info/templates/hooks/pre-install-job.yaml
  • k8s/devops-info/templates/hooks/post-install-job.yaml

Hook configuration:

  • Pre-install: helm.sh/hook: pre-install, weight -5
  • Post-install: helm.sh/hook: post-install, weight 5
  • Both: helm.sh/hook-delete-policy: hook-succeeded

Evidence:

$ .tools/helm install --dry-run --debug test-devops-prod k8s/devops-info -f k8s/devops-info/values-prod.yaml
HOOKS:
  ... "helm.sh/hook": pre-install
  ... "helm.sh/hook-weight": "-5"
  ... "helm.sh/hook-delete-policy": hook-succeeded
  ... "helm.sh/hook": post-install
  ... "helm.sh/hook-weight": "5"
  ... "helm.sh/hook-delete-policy": hook-succeeded

Task 5 - Documentation (2 pts)

  • k8s/HELM.md complete
  • Chart structure explained
  • Configuration guide provided
  • Hook implementation documented
  • Installation evidence included
  • Operations documented

Documentation file created:

  • k8s/HELM.md

Bonus - Library Charts (2.5 pts)

  • Library chart created
  • Shared templates extracted
  • Two app charts using library
  • Dependencies configured
  • Both apps deploy successfully (validated via lint/template/dry-run)
  • Documentation complete

Bonus files:

  • Library chart: k8s/common-lib
  • App charts using dependency:
    • k8s/devops-info/Chart.yaml
    • k8s/hello-app/Chart.yaml

Shared templates used:

  • common.name
  • common.fullname
  • common.labels
  • common.selectorLabels

Evidence:

$ .tools/helm dependency update k8s/devops-info
Saving 1 charts

$ .tools/helm dependency update k8s/hello-app
Saving 1 charts

$ .tools/helm lint k8s/hello-app
1 chart(s) linted, 0 chart(s) failed

$ .tools/helm install --dry-run --debug test-hello k8s/hello-app
STATUS: pending-install
DESCRIPTION: Dry run complete

Commands Used (Complete Set)

# Helm fundamentals
.tools/helm version
.tools/helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
.tools/helm repo update
.tools/helm search repo prometheus-community/prometheus
.tools/helm show chart prometheus-community/prometheus

# Dependency management
.tools/helm dependency update k8s/devops-info
.tools/helm dependency update k8s/hello-app

# Validation
.tools/helm lint k8s/common-lib
.tools/helm lint k8s/devops-info
.tools/helm lint k8s/hello-app
.tools/helm template devops-info k8s/devops-info
.tools/helm template devops-info-dev k8s/devops-info -f k8s/devops-info/values-dev.yaml
.tools/helm template devops-info-prod k8s/devops-info -f k8s/devops-info/values-prod.yaml
.tools/helm template hello-app k8s/hello-app
.tools/helm install --dry-run --debug test-devops k8s/devops-info -f k8s/devops-info/values-dev.yaml
.tools/helm install --dry-run --debug test-devops-prod k8s/devops-info -f k8s/devops-info/values-prod.yaml
.tools/helm install --dry-run --debug test-hello k8s/hello-app