10-reference-architecture.md

Reference Architecture

Consolidated architecture diagrams, reference patterns, and quick reference guides for GitHub Enterprise Cloud administration and governance.

---

Table of Contents

• Complete Enterprise Architecture
• Organization Topology Patterns
• IAM Integration Architecture
• Security Scanning Architecture
• CI/CD Pipeline Governance Architecture
• Hybrid and Multi-Cloud Integration
• Migration Architecture
• Quick Reference Cards

---

Complete Enterprise Architecture

The complete GitHub Enterprise Cloud architecture shows all major components and their relationships.

graph TB
    subgraph "Identity Provider"
        IdP[Identity Provider<br/>Entra ID / Okta]
        IdPGroups[IdP Groups]
    end
    
    subgraph "GitHub Enterprise Cloud"
        Enterprise[Enterprise Account]
        
        subgraph "Organizations"
            OrgProd[Production Org]
            OrgDev[Development Org]
            OrgSandbox[Sandbox Org]
        end
        
        subgraph "IAM Layer"
            SAML[SAML SSO]
            SCIM[SCIM Provisioning]
            EMU[Enterprise Managed Users]
        end
        
        subgraph "Security Layer"
            GHAS[GitHub Advanced Security]
            CodeQL[Code Scanning]
            SecretScan[Secret Scanning]
            Dependabot[Dependabot]
        end
        
        subgraph "Governance Layer"
            Policies[Enterprise Policies]
            Rulesets[Repository Rulesets]
            Audit[Audit Logs]
        end
    end
    
    subgraph "External Integrations"
        SIEM[SIEM System]
        Backup[Backup Solution]
        CICD[CI/CD Platform]
    end
    
    IdP -->|SAML Auth| SAML
    IdP -->|SCIM Sync| SCIM
    SCIM -->|Provision| EMU
    IdPGroups -->|Team Sync| OrgProd
    IdPGroups -->|Team Sync| OrgDev
    
    Enterprise --> Policies
    Policies --> OrgProd
    Policies --> OrgDev
    Policies --> OrgSandbox
    
    OrgProd --> GHAS
    OrgDev --> GHAS
    GHAS --> CodeQL
    GHAS --> SecretScan
    GHAS --> Dependabot
    
    Policies --> Rulesets
    Rulesets --> OrgProd
    Rulesets --> OrgDev
    
    Audit -->|Stream| SIEM
    OrgProd -->|Backup| Backup
    OrgProd -->|Workflows| CICD
    
    style Enterprise fill:#0366d6,color:#fff
    style GHAS fill:#28a745,color:#fff
    style Policies fill:#6f42c1,color:#fff

Loading

Architecture Components

1. Identity Provider Layer: Centralized authentication and user provisioning
2. IAM Layer: SAML SSO, SCIM provisioning, and Enterprise Managed Users
3. Organization Layer: Multi-org topology for environment separation
4. Security Layer: GitHub Advanced Security features
5. Governance Layer: Enterprise policies, rulesets, and audit logging
6. Integration Layer: External systems (SIEM, backup, CI/CD)

---

Organization Topology Patterns

Pattern 1: Single Organization

graph TB
    Enterprise[Enterprise Account]
    
    subgraph "Single Organization"
        Org[acme-corp]
        
        subgraph "Teams by Function"
            Platform[Platform Team]
            Frontend[Frontend Team]
            Backend[Backend Team]
            Security[Security Team]
        end
        
        subgraph "Repositories"
            ProdRepos[Production Repos]
            DevRepos[Development Repos]
            InfraRepos[Infrastructure Repos]
        end
    end
    
    Enterprise --> Org
    Org --> Platform
    Org --> Frontend
    Org --> Backend
    Org --> Security
    
    Platform --> InfraRepos
    Frontend --> ProdRepos
    Backend --> ProdRepos
    Security --> ProdRepos
    
    style Enterprise fill:#0366d6,color:#fff
    style Org fill:#28a745,color:#fff

Loading

Best For:

• Small to medium enterprises (< 500 developers)
• Single business unit
• Unified governance model
• Simple compliance requirements

Pattern 2: Multi-Organization (Red-Green-Sandbox-Archive)

graph TB
    Enterprise[Enterprise Account]
    
    subgraph "Production Environment"
        Red[acme-prod-red]
        Green[acme-prod-green]
    end
    
    subgraph "Non-Production"
        Dev[acme-dev]
        Sandbox[acme-sandbox]
    end
    
    subgraph "Historical"
        Archive[acme-archive]
    end
    
    Enterprise --> Red
    Enterprise --> Green
    Enterprise --> Dev
    Enterprise --> Sandbox
    Enterprise --> Archive
    
    Red -.->|Blue-Green Deploy| Green
    Dev -->|Promote| Red
    Sandbox -.->|Experiment| Dev
    Red -.->|Retire| Archive
    
    style Enterprise fill:#0366d6,color:#fff
    style Red fill:#dc3545,color:#fff
    style Green fill:#28a745,color:#fff
    style Dev fill:#ffc107,color:#000
    style Sandbox fill:#17a2b8,color:#fff
    style Archive fill:#6c757d,color:#fff

Loading

Best For:

• Large enterprises (500+ developers)
• Blue-green deployment patterns
• Multiple environments with strict separation
• Complex compliance requirements
• Innovation and experimentation needs

Pattern 3: Business Unit Separation

graph TB
    Enterprise[Enterprise Account]
    
    subgraph "Business Units"
        BU1[acme-retail]
        BU2[acme-wholesale]
        BU3[acme-logistics]
    end
    
    subgraph "Shared Services"
        Platform[acme-platform]
        Security[acme-security]
    end
    
    Enterprise --> BU1
    Enterprise --> BU2
    Enterprise --> BU3
    Enterprise --> Platform
    Enterprise --> Security
    
    Platform -.->|Shared Libraries| BU1
    Platform -.->|Shared Libraries| BU2
    Platform -.->|Shared Libraries| BU3
    
    Security -.->|Security Scanning| BU1
    Security -.->|Security Scanning| BU2
    Security -.->|Security Scanning| BU3
    
    style Enterprise fill:#0366d6,color:#fff
    style BU1 fill:#28a745,color:#fff
    style BU2 fill:#28a745,color:#fff
    style BU3 fill:#28a745,color:#fff
    style Platform fill:#6f42c1,color:#fff
    style Security fill:#dc3545,color:#fff

Loading

Best For:

• Multi-division enterprises
• Independent P&L units
• Different compliance requirements per unit
• Decentralized governance

---

IAM Integration Architecture

Enterprise Managed Users (EMU) with Microsoft Entra ID

sequenceDiagram
    participant User
    participant EntraID as Microsoft Entra ID
    participant SCIM as SCIM Endpoint
    participant GitHub as GitHub Enterprise
    participant Repo as Repository
    
    Note over EntraID,GitHub: Initial Provisioning
    EntraID->>SCIM: Create User (SCIM 2.0)
    SCIM->>GitHub: Provision username_shortcode
    GitHub-->>SCIM: User Created
    SCIM-->>EntraID: Confirmation
    
    Note over EntraID,GitHub: Group Synchronization
    EntraID->>SCIM: Sync Group Membership
    SCIM->>GitHub: Update Team Membership
    GitHub-->>SCIM: Team Updated
    
    Note over User,Repo: Authentication Flow
    User->>EntraID: Login Request
    EntraID->>User: MFA Challenge
    User->>EntraID: MFA Token
    EntraID->>GitHub: SAML Assertion
    GitHub->>User: Session Token
    User->>Repo: Access Repository
    Repo->>GitHub: Verify Permissions
    GitHub-->>Repo: Access Granted
    Repo-->>User: Repository Content
    
    Note over EntraID,GitHub: Deprovisioning
    EntraID->>SCIM: Delete User
    SCIM->>GitHub: Suspend Account
    GitHub-->>SCIM: Account Suspended

Loading

Personal Accounts with SAML SSO

graph LR
    subgraph "Identity Provider"
        IdP[Okta / Entra ID]
    end
    
    subgraph "GitHub Enterprise"
        Enterprise[Enterprise Account]
        Org1[Organization 1]
        Org2[Organization 2]
    end
    
    subgraph "Users"
        PersonalAcct[Personal GitHub Account]
    end
    
    IdP -->|SAML SSO| Enterprise
    Enterprise --> Org1
    Enterprise --> Org2
    PersonalAcct -->|SSO Required| Org1
    PersonalAcct -->|SSO Required| Org2
    IdP -.->|Authenticate| PersonalAcct
    
    style IdP fill:#0366d6,color:#fff
    style Enterprise fill:#28a745,color:#fff
    style PersonalAcct fill:#ffc107,color:#000

Loading

Key Differences:

Feature	EMU	Personal Accounts with SSO
Identity Source	IdP only	GitHub + IdP
Username Format	user_shortcode	user (personal)
Account Creation	IdP provisioning	Self-service
Deprovisioning	Automatic via SCIM	Manual removal
External Collaboration	Limited	Full access
Public Repos	Enterprise only	Personal + Enterprise

---

Security Scanning Architecture

GitHub Advanced Security Pipeline

graph TB
    subgraph "Developer Workflow"
        Dev[Developer]
        LocalCode[Local Code]
        Commit[Git Commit]
    end
    
    subgraph "GitHub Repository"
        PR[Pull Request]
        MainBranch[Main Branch]
    end
    
    subgraph "Security Scanning"
        SecretScan[Secret Scanning<br/>Push Protection]
        CodeQL[CodeQL Analysis]
        DependencyReview[Dependency Review]
        Dependabot[Dependabot Alerts]
    end
    
    subgraph "Security Dashboard"
        Alerts[Security Alerts]
        Dashboard[Security Overview]
        Reports[Compliance Reports]
    end
    
    Dev --> LocalCode
    LocalCode --> Commit
    Commit -->|Push| SecretScan
    SecretScan -->|Block if Secret Found| Commit
    SecretScan -->|Pass| PR
    
    PR --> CodeQL
    PR --> DependencyReview
    
    CodeQL -->|Vulnerabilities| Alerts
    DependencyReview -->|CVEs| Alerts
    Dependabot -->|Updates| PR
    
    MainBranch --> Dependabot
    MainBranch --> CodeQL
    
    Alerts --> Dashboard
    Dashboard --> Reports
    
    style SecretScan fill:#dc3545,color:#fff
    style CodeQL fill:#28a745,color:#fff
    style DependencyReview fill:#ffc107,color:#000
    style Alerts fill:#dc3545,color:#fff

Loading

Secret Scanning with Push Protection

sequenceDiagram
    participant Dev as Developer
    participant Git as Git Client
    participant GitHub as GitHub
    participant SecretScan as Secret Scanner
    participant Security as Security Team
    
    Dev->>Git: git push
    Git->>GitHub: Push commits
    GitHub->>SecretScan: Scan commits
    
    alt Secret Detected
        SecretScan-->>GitHub: Secret Found
        GitHub-->>Git: Push Blocked
        Git-->>Dev: Error: Secret detected
        Dev->>GitHub: Request bypass (with justification)
        GitHub->>Security: Bypass request notification
        Security->>GitHub: Approve/Deny
        
        alt Approved
            GitHub-->>Dev: Bypass granted
            Dev->>Git: git push (with bypass token)
            Git->>GitHub: Push with bypass
            GitHub->>SecretScan: Log bypass event
        else Denied
            Security-->>Dev: Bypass denied
            Dev->>Dev: Remove secret and retry
        end
    else No Secret
        SecretScan-->>GitHub: Clean
        GitHub-->>Git: Push accepted
        Git-->>Dev: Success
    end

Loading

---

CI/CD Pipeline Governance Architecture

GitHub Actions with Policy Enforcement

graph TB
    subgraph "Enterprise Policies"
        EnterprisePolicy[Enterprise Policy<br/>Allowed Actions List]
    end
    
    subgraph "Organization Configuration"
        OrgPolicy[Organization Settings<br/>Actions Permissions]
        RunnerGroup[Self-Hosted Runner Groups]
        Secrets[Organization Secrets]
    end
    
    subgraph "Repository"
        Workflow[Workflow YAML]
        RepoSecrets[Repository Secrets]
        Environments[Environments]
    end
    
    subgraph "Execution"
        Runner[GitHub Runner]
        Job1[Build Job]
        Job2[Test Job]
        Job3[Deploy Job]
    end
    
    subgraph "Security Controls"
        OIDC[OIDC Token]
        Audit[Audit Logs]
        ReviewGate[Required Reviewers]
    end
    
    EnterprisePolicy --> OrgPolicy
    OrgPolicy --> Workflow
    
    Workflow --> Job1
    Workflow --> Job2
    Workflow --> Job3
    
    Job1 --> Runner
    Job2 --> Runner
    Job3 --> Runner
    
    RunnerGroup --> Runner
    Secrets --> Job1
    RepoSecrets --> Job2
    Environments --> Job3
    
    Job3 --> OIDC
    Job3 --> ReviewGate
    
    Runner --> Audit
    
    style EnterprisePolicy fill:#6f42c1,color:#fff
    style OrgPolicy fill:#0366d6,color:#fff
    style ReviewGate fill:#dc3545,color:#fff
    style OIDC fill:#28a745,color:#fff

Loading

Deployment Pipeline with Environments

graph LR
    subgraph "Source"
        Code[Code Repository]
    end
    
    subgraph "Build & Test"
        Build[Build]
        Test[Unit Tests]
        Scan[Security Scan]
    end
    
    subgraph "Environments"
        Dev[Development<br/>Auto Deploy]
        Staging[Staging<br/>Required Reviewers]
        Prod[Production<br/>Required Reviewers<br/>Wait Timer]
    end
    
    Code --> Build
    Build --> Test
    Test --> Scan
    
    Scan --> Dev
    Dev --> Staging
    Staging --> Prod
    
    style Dev fill:#17a2b8,color:#fff
    style Staging fill:#ffc107,color:#000
    style Prod fill:#dc3545,color:#fff

Loading

---

Hybrid and Multi-Cloud Integration

GitHub Enterprise with On-Premises Systems

graph TB
    subgraph "GitHub Enterprise Cloud"
        GHEC[GitHub Enterprise Cloud]
        Repos[Repositories]
        Actions[GitHub Actions]
    end
    
    subgraph "Corporate Network"
        subgraph "Identity"
            OnPremIdP[On-Premises IdP]
            ADConnect[AD Connect]
        end
        
        subgraph "CI/CD"
            SelfHosted[Self-Hosted Runners]
            Artifacts[Artifact Storage]
        end
        
        subgraph "Security"
            Firewall[Firewall]
            VPN[VPN Gateway]
            SIEM[SIEM System]
        end
    end
    
    subgraph "Cloud Providers"
        Azure[Azure]
        AWS[AWS]
        GCP[Google Cloud]
    end
    
    OnPremIdP -->|SAML| GHEC
    ADConnect -->|Sync| OnPremIdP
    
    GHEC -->|Webhook| SelfHosted
    SelfHosted -->|Store| Artifacts
    
    Actions -->|OIDC| Azure
    Actions -->|OIDC| AWS
    Actions -->|OIDC| GCP
    
    GHEC -->|Audit Stream| SIEM
    Firewall -->|IP Allow List| GHEC
    VPN -.->|Secure Access| SelfHosted
    
    style GHEC fill:#0366d6,color:#fff
    style OnPremIdP fill:#6f42c1,color:#fff
    style SelfHosted fill:#28a745,color:#fff

Loading

---

Migration Architecture

Migration from Other Platforms to GitHub Enterprise Cloud

graph TB
    subgraph "Source Platform"
        SourceVCS[Source VCS<br/>GitLab/Bitbucket/Azure DevOps]
        SourceRepos[Repositories]
        SourceIssues[Issues/Work Items]
        SourceCI[CI/CD Pipelines]
    end
    
    subgraph "Migration Tools"
        GEI[GitHub Enterprise Importer]
        Scripts[Custom Scripts]
        API[REST/GraphQL API]
    end
    
    subgraph "GitHub Enterprise Cloud"
        subgraph "Target Structure"
            Orgs[Organizations]
            Repos[Repositories]
            Teams[Teams]
        end
        
        subgraph "Migrated Content"
            Code[Source Code]
            History[Git History]
            Issues[Issues]
            Workflows[GitHub Actions]
        end
    end
    
    subgraph "Post-Migration"
        Validation[Validation]
        Training[User Training]
        Cutover[Production Cutover]
    end
    
    SourceRepos -->|Git Clone/Push| GEI
    SourceIssues -->|Export/Import| API
    SourceCI -->|Translate| Scripts
    
    GEI --> Orgs
    GEI --> Repos
    API --> Issues
    Scripts --> Workflows
    
    Repos --> Code
    Repos --> History
    Orgs --> Teams
    
    Code --> Validation
    History --> Validation
    Issues --> Validation
    Workflows --> Validation
    
    Validation --> Training
    Training --> Cutover
    
    style GEI fill:#0366d6,color:#fff
    style Validation fill:#28a745,color:#fff
    style Cutover fill:#dc3545,color:#fff

Loading

Migration Phases

gantt
    title GitHub Enterprise Migration Timeline
    dateFormat YYYY-MM-DD
    section Planning
    Assessment & Planning           :p1, 2024-01-01, 30d
    Pilot Organization Setup        :p2, after p1, 14d
    section Migration
    Pilot Migration (10 repos)      :m1, after p2, 14d
    Wave 1 (100 repos)              :m2, after m1, 21d
    Wave 2 (500 repos)              :m3, after m2, 21d
    Wave 3 (Remaining)              :m4, after m3, 30d
    section Validation
    Parallel Running                :v1, after m2, 60d
    User Training                   :v2, after m2, 45d
    section Cutover
    Production Cutover              :c1, after v1, 7d
    Decommission Old Platform       :c2, after c1, 30d

Loading

---

Quick Reference Cards

Permission Levels Quick Reference

Repository Permissions

Level	Read	Write	Admin
Read	✅ View code ✅ Open issues ✅ Comment	❌	❌
Triage	✅ Read access ✅ Manage issues ✅ Manage PRs	❌	❌
Write	✅ Triage access ✅ Push commits ✅ Merge PRs	✅ Push to branch ✅ Create releases	❌
Maintain	✅ Write access ✅ Manage issues ✅ Manage releases	✅ Push to protected ✅ Manage webhooks	❌ Delete repo
Admin	✅ Maintain access ✅ Full control	✅ All write access	✅ Delete repo ✅ Manage settings ✅ Manage access

Organization Roles

Role	Scope	Key Permissions
Owner	Organization	• Full admin access • Manage all repos • Manage members • Configure SSO • Access billing
Billing Manager	Billing only	• View billing info • Update payment methods • View usage reports
Member	Limited	• Create repos (if allowed) • Create teams • View members
Moderator	Content	• Block/unblock users • Limit interactions • Manage comments

Enterprise Roles

Role	Permissions
Enterprise Owner	• Full enterprise control • Manage organizations • Configure policies • Access audit logs • Manage billing
Billing Manager	• View/update billing • View usage reports • No organization access
Member	• Access via organization • No enterprise settings

Policy Inheritance Matrix

graph TD
    Enterprise[Enterprise Level<br/>ENFORCED/ALLOWED/DISABLED]
    Org[Organization Level<br/>Can restrict if ALLOWED]
    Repo[Repository Level<br/>Can restrict if Org allows]
    
    Enterprise -->|ENFORCED| Org
    Enterprise -->|ALLOWED| Org
    Enterprise -->|DISABLED| Org
    
    Org -->|Org Policy| Repo
    
    style Enterprise fill:#6f42c1,color:#fff
    style Org fill:#0366d6,color:#fff
    style Repo fill:#28a745,color:#fff

Loading

Policy	Enterprise	Organization	Repository
Actions Permissions	Allowed list	Can restrict further	Cannot override
Repository Visibility	Enforced/Allowed	Can restrict	Cannot override
Forking	Allowed/Disabled	Can disable	Cannot override
GitHub Pages	Enabled/Disabled	Can disable	Cannot override
Branch Protection	N/A	N/A	Full control
Rulesets	Via org policy	Applied to repos	Can add more rules

Security Features Matrix

Feature	Free	Team	Enterprise with GHAS
Dependabot Alerts	Public repos	All repos	All repos
Dependabot Security Updates	Public repos	All repos	All repos
Dependabot Version Updates	✅	✅	✅
Dependency Review	Public repos	❌	✅
Code Scanning (CodeQL)	Public repos	❌	✅
Secret Scanning	Public repos	❌	✅
Secret Push Protection	Public repos	❌	✅
Custom Secret Patterns	❌	❌	✅
Security Overview	❌	❌	✅

Rulesets vs Branch Protection

Feature	Branch Protection	Rulesets
Scope	Single branch pattern	Multiple branches/tags
Organization-Wide	❌	✅
Bypass Actors	Limited	✅ Full control
Status Checks	✅	✅
File Path Restrictions	❌	✅
Metadata Restrictions	❌	✅ (commit message, author)
Import/Export	❌	✅
Evaluation Modes	N/A	Active/Evaluate

Common CLI Commands

# GitHub CLI (gh) - Essential Commands

# Authentication
gh auth login
gh auth status

# Repository Management
gh repo create org/repo --public
gh repo clone org/repo
gh repo view org/repo

# Organization Management
gh api orgs/my-org
gh api orgs/my-org/members

# Team Management
gh api orgs/my-org/teams/my-team/members
gh api -X PUT orgs/my-org/teams/my-team/repos/my-org/my-repo

# Security Alerts
gh api repos/my-org/my-repo/code-scanning/alerts
gh api repos/my-org/my-repo/secret-scanning/alerts
gh api repos/my-org/my-repo/dependabot/alerts

# Audit Log (Enterprise)
gh api enterprises/my-enterprise/audit-log

# Actions
gh workflow list
gh workflow run workflow.yml
gh run list
gh run view 1234567890

# Rulesets
gh api repos/my-org/my-repo/rulesets
gh api -X POST repos/my-org/my-repo/rulesets --input ruleset.json

# Organization Policies
gh api -X PUT orgs/my-org/actions/permissions --field allowed_actions=selected

Terraform Resource Quick Reference

# Essential GitHub Terraform Resources

# Organization
resource "github_organization_settings" "main" {
  billing_email = "billing@example.com"
}

# Team
resource "github_team" "engineering" {
  name        = "engineering"
  description = "Engineering team"
  privacy     = "closed"
}

# Repository
resource "github_repository" "main" {
  name        = "my-repo"
  visibility  = "private"
  auto_init   = true
}

# Team Repository Access
resource "github_team_repository" "main" {
  team_id    = github_team.engineering.id
  repository = github_repository.main.name
  permission = "push"
}

# Branch Protection
resource "github_branch_protection" "main" {
  repository_id = github_repository.main.node_id
  pattern       = "main"
  
  required_pull_request_reviews {
    required_approving_review_count = 2
  }
}

# Repository Ruleset
resource "github_repository_ruleset" "main" {
  name        = "main-protection"
  repository  = github_repository.main.name
  target      = "branch"
  enforcement = "active"
  
  rules {
    required_linear_history = true
    required_signatures     = true
  }
}

# Actions Secrets
resource "github_actions_organization_secret" "main" {
  secret_name     = "API_TOKEN"
  visibility      = "selected"
  plaintext_value = var.api_token
}

---

Architecture Decision Records

ADR-001: Choose EMU vs Personal Accounts

Status: Template

Context: Organizations must decide between Enterprise Managed Users (EMU) and personal accounts with SAML SSO.

Decision Factors:

Factor	EMU	Personal Accounts
Identity Control	✅ Full control	⚠️ Partial
External Collaboration	⚠️ Limited	✅ Full
Open Source Contributions	❌	✅
Compliance Requirements	✅ Strong	⚠️ Moderate
User Experience	⚠️ Separate accounts	✅ Single account
Implementation Complexity	⚠️ Complex	✅ Simple

Recommendation:

• Choose EMU if: Strict compliance, regulated industry, need full lifecycle control
• Choose Personal Accounts if: Open source contributions, external collaboration, developer experience priority

ADR-002: Single vs Multi-Organization

Status: Template

Decision Factors:

Factor	Single Org	Multi Org
Simplicity	✅ Simple	⚠️ Complex
Environment Separation	⚠️ Weak	✅ Strong
Policy Management	✅ Centralized	⚠️ Distributed
Compliance Isolation	⚠️ Limited	✅ Strong
Cost	✅ Lower	⚠️ Higher
Scalability	⚠️ Limited	✅ High

Recommendation:

• Single Org: < 500 developers, simple governance, unified business unit
• Multi Org: > 500 developers, multiple environments, complex compliance, business unit separation

---

Integration Patterns

Pattern: SIEM Integration with Audit Log Streaming

sequenceDiagram
    participant GitHub as GitHub Enterprise
    participant Stream as Audit Log Stream
    participant SIEM as SIEM Platform
    participant SOC as Security Operations
    
    GitHub->>Stream: Audit Event (HTTPS/JSON)
    Stream->>SIEM: Forward Event
    
    alt Critical Event
        SIEM->>SIEM: Correlate with other events
        SIEM->>SOC: Generate Alert
        SOC->>GitHub: Investigate (via API)
        GitHub-->>SOC: Additional context
        SOC->>SOC: Take remediation action
    else Normal Event
        SIEM->>SIEM: Store for compliance
    end

Loading

Pattern: Automated Compliance Reporting

graph LR
    subgraph "Data Collection"
        API[GitHub API]
        Audit[Audit Logs]
    end
    
    subgraph "Processing"
        ETL[ETL Pipeline]
        Analytics[Analytics Engine]
    end
    
    subgraph "Reporting"
        Dashboard[Compliance Dashboard]
        Reports[Automated Reports]
        Alerts[Alert System]
    end
    
    API --> ETL
    Audit --> ETL
    ETL --> Analytics
    Analytics --> Dashboard
    Analytics --> Reports
    Analytics --> Alerts
    
    style API fill:#0366d6,color:#fff
    style Analytics fill:#28a745,color:#fff
    style Reports fill:#ffc107,color:#000

Loading

---

Summary

This reference architecture document provides consolidated views of:

1. Complete Enterprise Architecture - All components and relationships
2. Organization Topologies - Single, multi-org, and business unit patterns
3. IAM Integration - EMU and personal account flows
4. Security Architecture - GHAS features and scanning pipelines
5. CI/CD Governance - Actions policies and deployment patterns
6. Hybrid Integration - On-premises and multi-cloud connections
7. Migration Patterns - Moving to GitHub Enterprise Cloud
8. Quick References - Permissions, policies, CLI commands, and Terraform

Related Documentation

• Enterprise Hierarchy - Enterprise structure and roles
• Organization Strategies - Org design patterns
• Identity & Access Management - IAM configuration
• Enterprise Managed Users - EMU deep dive
• Teams & Permissions - Team structures
• Policy Inheritance - Policy enforcement
• Repository Governance - Repo settings and rulesets
• Security & Compliance - GHAS and compliance
• Best Practices & WAF - Well-Architected Framework

---

References

Architecture Documentation

• GitHub Enterprise Cloud Architecture
• GitHub Well-Architected Framework
• GitHub Enterprise Onboarding

Integration Guides

• SAML Configuration
• SCIM Provisioning
• Audit Log Streaming

API References

• GitHub REST API
• GitHub GraphQL API
• GitHub CLI

Terraform Provider

• GitHub Terraform Provider

Best Practices

• Best Practices for Organizations
• GitHub Enterprise Cloud eBook