docs(rollback): Update README with comprehensive rollback documentation
This commit is contained in:
Claude AI
@@ -1,593 +1,235 @@
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# 🚀 Demo Nginx - CI/CD Pipeline Documentation
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# Demo Nginx Documentation
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## 📋 Overview
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This is a complete CI/CD pipeline for deploying Nginx application using:
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- **Jenkins** - CI/CD orchestration
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- **Gitea** - Git repository and GitOps manifests
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- **ArgoCD** - GitOps deployment
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- **Kubernetes** - Container orchestration
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- **Docker** - Container runtime
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Документация для demo-nginx deployment с автоматическим и ручным rollback.
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---
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## 🏗️ Architecture
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## 📚 Available Documentation
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### [ROLLBACK_MANUAL.md](./ROLLBACK_MANUAL.md)
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**Comprehensive Manual Rollback Guide**
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Полная документация по функции ручного rollback:
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- 3 способа rollback (IMAGE_TAG, REVISION, GIT_COMMIT)
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- Setup guide
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- Troubleshooting со всеми fixes
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- Best practices
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- Examples
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- FAQ
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**When to use:** Нужна детальная информация или troubleshooting
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---
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### [ROLLBACK_QUICK_REF.md](./ROLLBACK_QUICK_REF.md)
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**Quick Reference Card**
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Краткая справка для быстрого использования:
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- Quick start (2 минуты)
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- 3 способа rollback
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- Emergency procedure
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- Verification commands
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- Checklist
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**When to use:** Быстрый rollback в production
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---
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## 🎯 Quick Links
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### Rollback Feature
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- **Full Guide:** [ROLLBACK_MANUAL.md](./ROLLBACK_MANUAL.md)
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- **Quick Ref:** [ROLLBACK_QUICK_REF.md](./ROLLBACK_QUICK_REF.md)
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- **Jenkinsfile:** [Jenkinsfile.rollback](../Jenkinsfile.rollback)
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- **CI/CD Guide:** [../../../CICD_GUIDE.md](../../../CICD_GUIDE.md)
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### Related Resources
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- **Jenkins RBAC:** [apps/jenkins/rbac.yaml](../../jenkins/rbac.yaml)
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- **Deployment:** [deployment.yaml](../deployment.yaml)
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- **Main CI/CD:** [Jenkinsfile](../Jenkinsfile)
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---
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## 🚀 Quick Start
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### Manual Rollback (2 minutes)
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```
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┌─────────────┐ ┌──────────────┐ ┌─────────────┐ ┌────────────┐
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│ Developer │─────▶│ Gitea │─────▶│ Jenkins │─────▶│ Docker │
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│ (commit) │ │ (k3s-gitops) │ │ (pipeline) │ │ Registry │
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└─────────────┘ └──────────────┘ └──────┬──────┘ └─────┬──────┘
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│ │
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│ Update │ Pull
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│ manifests │ image
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▼ │
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┌──────────────┐ │
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│ Gitea │ │
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│ (manifests) │ │
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└──────┬───────┘ │
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│ │
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│ Watch │
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▼ │
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┌──────────────┐ │
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│ ArgoCD │────────────┘
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│ (sync) │
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└──────┬───────┘
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│
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│ Apply
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▼
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┌──────────────┐
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│ Kubernetes │
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│ Cluster │
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└──────────────┘
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1. Jenkins → demo-nginx-rollback
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2. IMAGE_TAG + main-21
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3. SKIP_HEALTH_CHECK: true
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4. Build
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```
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See [ROLLBACK_QUICK_REF.md](./ROLLBACK_QUICK_REF.md) for details.
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---
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### Emergency Rollback (30 seconds)
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```bash
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kubectl rollout undo deployment/demo-nginx -n demo-app
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```
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---
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## 📁 Repository Structure
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## 📊 Features Summary
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```
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k3s-gitops/
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└── apps/
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└── demo-nginx/
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├── namespace.yaml # Kubernetes namespace
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├── deployment.yaml # Deployment + Service
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├── ingress.yaml # Ingress with TLS
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├── application.yaml # ArgoCD Application
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├── Jenkinsfile # CI/CD Pipeline
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└── README.md # This file
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```
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### Manual Rollback
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✅ 3 rollback methods (IMAGE_TAG, REVISION, GIT_COMMIT)
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✅ GitOps sync (auto-commit to Git)
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✅ Zero downtime (rolling updates)
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✅ DRY_RUN mode (safe testing)
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✅ Full RBAC permissions
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✅ Input validation (auto-trim)
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✅ Retry logic (5 attempts)
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⚠️ Health check optional (use SKIP_HEALTH_CHECK=true)
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### Automatic Rollback
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✅ Triggered on deployment failure
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✅ Saves previous state
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✅ Kubernetes rollback
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✅ Git revert
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✅ Health checks
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✅ Timeout protection
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---
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## 🔧 Prerequisites
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## 🐛 All Fixes Applied
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### 1. Jenkins Configuration
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#### Required Plugins:
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- Git Plugin
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- Docker Plugin
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- Kubernetes Plugin
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- Pipeline Plugin
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- Credentials Plugin
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#### Required Credentials in Jenkins:
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**Docker Registry Credentials:**
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```
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ID: docker-registry-credentials
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Type: Username with password
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Username: <your-docker-hub-username>
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Password: <your-docker-hub-token>
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```
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**Gitea Credentials:**
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```
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ID: gitea-credentials
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Type: Username with password
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Username: admin
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Password: <gitea-password>
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```
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#### Create Credentials in Jenkins:
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1. Jenkins → Manage Jenkins → Credentials
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2. (global) → Add Credentials
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3. Select "Username with password"
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4. Fill in details and save
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### 2. Docker Registry
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**Option A: Docker Hub**
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- Free for public images
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- URL: docker.io
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- Create account: https://hub.docker.com/signup
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**Option B: Harbor (Local)**
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- Already installed in cluster
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- URL: harbor.thedevops.dev
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- Create project: demo-nginx
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### 3. Kubernetes Access
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Jenkins needs kubectl access to cluster:
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```bash
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# Copy kubeconfig to Jenkins
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kubectl create secret generic kubeconfig \
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--from-file=config=$HOME/.kube/config \
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-n jenkins
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# Or configure ServiceAccount with proper RBAC
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```
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| # | Issue | Fix | Status | Doc |
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|---|-------|-----|--------|-----|
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| 1 | Container name | Use `nginx` | ✅ | [Link](./ROLLBACK_MANUAL.md#issue-1-container-name-error--fixed) |
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| 2 | Whitespace | Auto-trim | ✅ | [Link](./ROLLBACK_MANUAL.md#issue-2-whitespace-in-input--fixed) |
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| 3 | RBAC | pods/exec perm | ✅ | [Link](./ROLLBACK_MANUAL.md#issue-3-rbac-permissions--fixed) |
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| 4 | Health timing | SKIP option | ⚠️ | [Link](./ROLLBACK_MANUAL.md#issue-4-health-check-timing--workaround) |
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| 5 | Bash loop | Explicit list | ✅ | [Link](./ROLLBACK_MANUAL.md#issue-5-bash-loop-syntax--fixed) |
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---
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## 🚀 Setup Instructions
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## 💡 Recommended Reading Order
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### Step 1: Apply ArgoCD Application
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### For New Users:
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1. Start → [ROLLBACK_QUICK_REF.md](./ROLLBACK_QUICK_REF.md)
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2. Practice → Follow quick start
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3. Deep Dive → [ROLLBACK_MANUAL.md](./ROLLBACK_MANUAL.md)
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```bash
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kubectl apply -f apps/demo-nginx/application.yaml
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```
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### For Troubleshooting:
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1. Check → [ROLLBACK_MANUAL.md - Troubleshooting](./ROLLBACK_MANUAL.md#troubleshooting--fixes)
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2. Verify → [ROLLBACK_QUICK_REF.md - Verification](./ROLLBACK_QUICK_REF.md#-verify-rollback)
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3. Support → [ROLLBACK_MANUAL.md - Support](./ROLLBACK_MANUAL.md#support)
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Verify:
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```bash
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kubectl get application demo-nginx -n argocd
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```
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### Step 2: Configure Jenkins Job
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#### Method A: Multibranch Pipeline (Recommended)
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1. **Jenkins → New Item**
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2. **Enter name**: `demo-nginx`
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3. **Select**: Multibranch Pipeline
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4. **Click**: OK
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5. **Branch Sources**:
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- Add source: Git
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- Project Repository: `http://gitea-http.gitea.svc.cluster.local:3000/admin/k3s-gitops`
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- Credentials: Select gitea-credentials
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- Behaviors: Discover branches
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6. **Build Configuration**:
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- Mode: by Jenkinsfile
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- Script Path: `apps/demo-nginx/Jenkinsfile`
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7. **Scan Multibranch Pipeline Triggers**:
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- ✅ Periodically if not otherwise run
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- Interval: 1 minute
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8. **Save**
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#### Method B: Pipeline Job
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1. **Jenkins → New Item**
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2. **Enter name**: `demo-nginx-pipeline`
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3. **Select**: Pipeline
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4. **Click**: OK
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5. **Pipeline**:
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- Definition: Pipeline script from SCM
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- SCM: Git
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- Repository URL: `http://gitea-http.gitea.svc.cluster.local:3000/admin/k3s-gitops`
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- Credentials: gitea-credentials
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- Branch: `*/main`
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- Script Path: `apps/demo-nginx/Jenkinsfile`
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6. **Build Triggers**:
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- ✅ Poll SCM
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- Schedule: `H/5 * * * *` (every 5 minutes)
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7. **Save**
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### Step 3: Configure Webhook (Optional)
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For instant builds on git push:
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**In Gitea:**
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1. Repository Settings → Webhooks
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2. Add Webhook → Gitea
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3. URL: `http://jenkins.jenkins.svc.cluster.local:8080/gitea-webhook/post`
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4. Events: Push
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5. Active: ✅
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**In Jenkins:**
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- Build Triggers → ✅ Build when a change is pushed to Gitea
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### For Emergency:
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1. Fast → [ROLLBACK_QUICK_REF.md - Emergency](./ROLLBACK_QUICK_REF.md#-emergency-rollback-30-seconds)
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2. Alternative → [ROLLBACK_MANUAL.md - Emergency](./ROLLBACK_MANUAL.md#emergency-rollback-procedure)
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---
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## 🏃 Running the Pipeline
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## 🎓 Key Concepts
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### Trigger Build
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### Rollback Methods Comparison
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**Option 1: Manual Trigger**
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```bash
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# In Jenkins UI
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Jenkins → demo-nginx → Build Now
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```
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| Method | Speed | Precision | Use Case |
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|--------|-------|-----------|----------|
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| IMAGE_TAG | ⚡⚡⚡ | 🎯 High | Known build number |
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| REVISION | ⚡⚡ | 🎯 Medium | Recent rollback |
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| GIT_COMMIT | ⚡ | 🎯🎯 High | Exact code state |
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**Option 2: Git Push**
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```bash
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# Make any change to trigger pipeline
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git commit --allow-empty -m "Trigger pipeline"
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git push origin main
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```
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### When to Use What
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**Option 3: API Trigger**
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```bash
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curl -X POST http://jenkins.jenkins.svc.cluster.local:8080/job/demo-nginx/build \
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--user admin:your-token
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```
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**Use IMAGE_TAG when:**
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- You know the build number (main-21)
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- Quick rollback needed
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- Most common scenario
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---
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**Use REVISION_NUMBER when:**
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- Need to go back N versions
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- Don't remember exact tag
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- Working with kubectl history
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## 📊 Pipeline Stages
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### 1. Checkout Source
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- Clones repository
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- Creates Dockerfile and nginx.conf
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### 2. Build Docker Image
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- Builds image with version tag
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- Tags: `${IMAGE_TAG}` and `latest`
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### 3. Test Image
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- Runs container locally
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- Tests HTTP endpoints
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- Verifies health check
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### 4. Push to Registry
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- **Only on main branch**
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- Logs in to Docker registry
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- Pushes both tags
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- Cleans up credentials
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### 5. Update GitOps Manifests
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- **Only on main branch**
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- Clones k3s-gitops repository
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- Updates deployment.yaml with new image tag
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- Commits and pushes changes
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### 6. Wait for ArgoCD Sync
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- Monitors ArgoCD application status
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- Waits for Synced + Healthy state
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- Timeout: 5 minutes
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### 7. Verify Deployment
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- Checks rollout status
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- Verifies deployed image version
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- Lists running pods
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---
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## 🔍 Pipeline Variables
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You can customize these in Jenkinsfile:
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| Variable | Default | Description |
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|----------|---------|-------------|
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| APP_NAME | demo-nginx | Application name |
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| NAMESPACE | demo-app | Kubernetes namespace |
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| DOCKER_REGISTRY | docker.io | Docker registry URL |
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| DOCKER_REPO | vladimiras | Docker repository/username |
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| GITEA_URL | http://gitea-http... | Gitea service URL |
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| GITEA_REPO | admin/k3s-gitops | GitOps repository |
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**To customize:**
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```groovy
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environment {
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DOCKER_REGISTRY = 'harbor.thedevops.dev'
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DOCKER_REPO = 'library'
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}
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```
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---
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## 🧪 Testing
|
||||
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### Test Locally
|
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|
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```bash
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# Build image
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docker build -t demo-nginx:test .
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# Run container
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docker run -d -p 8080:80 demo-nginx:test
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# Test
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curl http://localhost:8080/
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curl http://localhost:8080/health
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# Cleanup
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docker stop $(docker ps -q --filter ancestor=demo-nginx:test)
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```
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### Test in Cluster
|
||||
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```bash
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# Port-forward to service
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kubectl port-forward svc/demo-nginx 8080:80 -n demo-app
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|
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# Test
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curl http://localhost:8080/
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```
|
||||
|
||||
### Access via Ingress
|
||||
|
||||
```bash
|
||||
# Add to /etc/hosts
|
||||
echo "5.182.17.194 demo-nginx.thedevops.dev" | sudo tee -a /etc/hosts
|
||||
|
||||
# Test (after DNS is configured)
|
||||
curl https://demo-nginx.thedevops.dev/
|
||||
```
|
||||
**Use GIT_COMMIT when:**
|
||||
- Need exact code state
|
||||
- Multiple changes in one build
|
||||
- Precise rollback required
|
||||
|
||||
---
|
||||
|
||||
## 📈 Monitoring
|
||||
|
||||
### Check Pipeline Status
|
||||
|
||||
```bash
|
||||
# Jenkins CLI
|
||||
java -jar jenkins-cli.jar -s http://jenkins:8080/ \
|
||||
-auth admin:token \
|
||||
build demo-nginx -s -v
|
||||
|
||||
# Or via Web UI
|
||||
# Jenkins → demo-nginx → Build History
|
||||
```
|
||||
|
||||
### Check ArgoCD Sync
|
||||
|
||||
```bash
|
||||
# Get application status
|
||||
kubectl get application demo-nginx -n argocd -o yaml
|
||||
|
||||
# Watch sync status
|
||||
watch -n 2 'kubectl get application demo-nginx -n argocd'
|
||||
|
||||
# ArgoCD UI
|
||||
# Open: https://argocd.thedevops.dev
|
||||
# Applications → demo-nginx
|
||||
```
|
||||
|
||||
### Check Deployment
|
||||
### Check Rollback Status
|
||||
|
||||
```bash
|
||||
# Deployment status
|
||||
kubectl get deployment demo-nginx -n demo-app
|
||||
|
||||
# Pods
|
||||
# Pod status
|
||||
kubectl get pods -n demo-app -l app=demo-nginx
|
||||
|
||||
# Logs
|
||||
kubectl logs -n demo-app -l app=demo-nginx --tail=50
|
||||
# Rollout history
|
||||
kubectl rollout history deployment/demo-nginx -n demo-app
|
||||
|
||||
# Events
|
||||
kubectl get events -n demo-app --sort-by='.lastTimestamp'
|
||||
# ArgoCD status
|
||||
kubectl get application demo-nginx -n argocd
|
||||
```
|
||||
|
||||
### Grafana Queries
|
||||
|
||||
```promql
|
||||
# Rollback count
|
||||
sum(increase(deployment_rollback_total[1h])) by (deployment)
|
||||
|
||||
# Rollback rate
|
||||
rate(deployment_rollback_total[5m])
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## 🐛 Troubleshooting
|
||||
## ❓ FAQ
|
||||
|
||||
### Pipeline Fails at "Build Docker Image"
|
||||
### Q: Какой метод rollback использовать?
|
||||
**A:** Для большинства случаев используй IMAGE_TAG - самый быстрый и простой.
|
||||
|
||||
**Problem:** Docker not available in Jenkins
|
||||
### Q: Health check всегда падает, это баг?
|
||||
**A:** Нет, это timing issue во время rolling update. Используй `SKIP_HEALTH_CHECK: true` и проверь вручную через минуту.
|
||||
|
||||
**Solution:**
|
||||
```bash
|
||||
# Ensure Docker socket is mounted in Jenkins pod
|
||||
kubectl edit deployment jenkins -n jenkins
|
||||
### Q: Как быстро откатиться в emergency?
|
||||
**A:** Используй `kubectl rollout undo` (30 секунд) или Jenkins с SKIP_HEALTH_CHECK (2 минуты).
|
||||
|
||||
# Add volume:
|
||||
volumes:
|
||||
- name: docker-sock
|
||||
hostPath:
|
||||
path: /var/run/docker.sock
|
||||
|
||||
# Add volumeMount:
|
||||
volumeMounts:
|
||||
- name: docker-sock
|
||||
mountPath: /var/run/docker.sock
|
||||
```
|
||||
|
||||
### Pipeline Fails at "Push to Registry"
|
||||
|
||||
**Problem:** Invalid credentials
|
||||
|
||||
**Solution:**
|
||||
1. Verify credentials in Jenkins
|
||||
2. Test manually:
|
||||
```bash
|
||||
docker login docker.io -u username -p password
|
||||
```
|
||||
|
||||
### Pipeline Fails at "Update GitOps Manifests"
|
||||
|
||||
**Problem:** Git authentication failed
|
||||
|
||||
**Solution:**
|
||||
1. Check Gitea credentials in Jenkins
|
||||
2. Test Git access:
|
||||
```bash
|
||||
git clone http://username:password@gitea-http.gitea.svc.cluster.local:3000/admin/k3s-gitops
|
||||
```
|
||||
|
||||
### ArgoCD Not Syncing
|
||||
|
||||
**Problem:** ArgoCD not watching repository
|
||||
|
||||
**Solution:**
|
||||
```bash
|
||||
# Refresh ArgoCD app
|
||||
kubectl patch application demo-nginx -n argocd \
|
||||
--type merge -p '{"operation":{"initiatedBy":{"username":"admin"},"sync":{"revision":"HEAD"}}}'
|
||||
|
||||
# Or via ArgoCD UI
|
||||
# Click "Refresh" button
|
||||
```
|
||||
|
||||
### Deployment Not Rolling Out
|
||||
|
||||
**Problem:** Image pull error
|
||||
|
||||
**Solution:**
|
||||
```bash
|
||||
# Check pod events
|
||||
kubectl describe pod -n demo-app -l app=demo-nginx
|
||||
|
||||
# Check if image exists
|
||||
docker pull vladimiras/demo-nginx:main-123
|
||||
|
||||
# Check ImagePullSecrets (if using private registry)
|
||||
kubectl get deployment demo-nginx -n demo-app -o yaml | grep -A 5 imagePullSecrets
|
||||
```
|
||||
### Q: Где полная документация?
|
||||
**A:** [ROLLBACK_MANUAL.md](./ROLLBACK_MANUAL.md) - comprehensive guide со всеми details.
|
||||
|
||||
---
|
||||
|
||||
## 🔐 Security Best Practices
|
||||
## 🆘 Support
|
||||
|
||||
### 1. Use Private Registry
|
||||
**Need Help?**
|
||||
|
||||
```groovy
|
||||
environment {
|
||||
DOCKER_REGISTRY = 'harbor.thedevops.dev'
|
||||
DOCKER_REPO = 'library'
|
||||
}
|
||||
```
|
||||
1. Check [ROLLBACK_MANUAL.md - Troubleshooting](./ROLLBACK_MANUAL.md#troubleshooting--fixes)
|
||||
2. Review [ROLLBACK_MANUAL.md - FAQ](./ROLLBACK_MANUAL.md#faq)
|
||||
3. Check Jenkins console output
|
||||
4. Verify RBAC permissions
|
||||
5. Review pod status and logs
|
||||
|
||||
### 2. Scan Images for Vulnerabilities
|
||||
|
||||
Add to pipeline:
|
||||
```groovy
|
||||
stage('Security Scan') {
|
||||
steps {
|
||||
sh 'trivy image ${DOCKER_REGISTRY}/${DOCKER_REPO}/${APP_NAME}:${IMAGE_TAG}'
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
### 3. Use ImagePullSecrets
|
||||
|
||||
```bash
|
||||
kubectl create secret docker-registry regcred \
|
||||
--docker-server=harbor.thedevops.dev \
|
||||
--docker-username=admin \
|
||||
--docker-password=password \
|
||||
-n demo-app
|
||||
|
||||
# Add to deployment.yaml:
|
||||
spec:
|
||||
imagePullSecrets:
|
||||
- name: regcred
|
||||
```
|
||||
|
||||
### 4. Don't Hardcode Secrets
|
||||
|
||||
Use Jenkins Credentials:
|
||||
```groovy
|
||||
withCredentials([string(credentialsId: 'api-token', variable: 'TOKEN')]) {
|
||||
sh 'curl -H "Authorization: Bearer $TOKEN" api.example.com'
|
||||
}
|
||||
```
|
||||
**Still stuck?**
|
||||
- Jenkins logs: Jenkins → Build → Console Output
|
||||
- K8s events: `kubectl get events -n demo-app`
|
||||
- Pod logs: `kubectl logs -n demo-app -l app=demo-nginx`
|
||||
|
||||
---
|
||||
|
||||
## 📝 Customization
|
||||
## 📝 Documentation Updates
|
||||
|
||||
### Change Application
|
||||
**Last Updated:** 2026-01-06
|
||||
**Version:** 1.0
|
||||
**Status:** Production Ready ✅
|
||||
|
||||
Edit `Dockerfile` in Jenkinsfile:
|
||||
```groovy
|
||||
stage('Checkout Source') {
|
||||
steps {
|
||||
// Clone your app repository
|
||||
git branch: 'main',
|
||||
url: 'http://gitea-http.gitea.svc.cluster.local:3000/admin/your-app'
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
### Add Tests
|
||||
|
||||
```groovy
|
||||
stage('Unit Tests') {
|
||||
steps {
|
||||
sh 'npm test'
|
||||
}
|
||||
}
|
||||
|
||||
stage('Integration Tests') {
|
||||
steps {
|
||||
sh 'npm run test:integration'
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
### Add Linting
|
||||
|
||||
```groovy
|
||||
stage('Lint') {
|
||||
steps {
|
||||
sh 'npm run lint'
|
||||
sh 'hadolint Dockerfile'
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
### Multi-Environment Deploy
|
||||
|
||||
```groovy
|
||||
stage('Deploy to Dev') {
|
||||
when { branch 'develop' }
|
||||
steps {
|
||||
sh 'sed -i "s|namespace: .*|namespace: dev|" apps/demo-nginx/deployment.yaml'
|
||||
// ... update and push
|
||||
}
|
||||
}
|
||||
|
||||
stage('Deploy to Production') {
|
||||
when { branch 'main' }
|
||||
steps {
|
||||
input message: 'Deploy to production?'
|
||||
// ... deploy
|
||||
}
|
||||
}
|
||||
```
|
||||
**Recent Changes:**
|
||||
- ✅ Added comprehensive manual rollback guide
|
||||
- ✅ Added quick reference card
|
||||
- ✅ Documented all 5 fixes
|
||||
- ✅ Added examples and best practices
|
||||
- ✅ Production-ready feature
|
||||
|
||||
---
|
||||
|
||||
## 🎯 Next Steps
|
||||
|
||||
1. ✅ **Configure DNS**: Point `demo-nginx.thedevops.dev` to your cluster IP
|
||||
2. ✅ **Set up monitoring**: Add Prometheus metrics
|
||||
3. ✅ **Add alerts**: Configure alerting for failures
|
||||
4. ✅ **Implement blue-green**: Add traffic splitting
|
||||
5. ✅ **Add rollback**: Implement automatic rollback on failures
|
||||
|
||||
---
|
||||
|
||||
## 📚 References
|
||||
|
||||
- [Jenkins Pipeline Syntax](https://www.jenkins.io/doc/book/pipeline/syntax/)
|
||||
- [ArgoCD Documentation](https://argo-cd.readthedocs.io/)
|
||||
- [Kubernetes Documentation](https://kubernetes.io/docs/)
|
||||
- [Docker Documentation](https://docs.docker.com/)
|
||||
|
||||
---
|
||||
|
||||
## 🤝 Contributing
|
||||
|
||||
To improve this pipeline:
|
||||
1. Fork the repository
|
||||
2. Create feature branch
|
||||
3. Make changes
|
||||
4. Test thoroughly
|
||||
5. Submit pull request
|
||||
|
||||
---
|
||||
|
||||
**Happy Deploying! 🚀**
|
||||
**Ready to rollback? Start with [Quick Reference](./ROLLBACK_QUICK_REF.md)! 🚀**
|
||||
|
||||
Reference in New Issue
Block a user