Azure Diagrams

Azure Architecture Diagrams Skill

A comprehensive technical diagramming toolkit for solutions architects, presales engineers, and developers. Generate professional diagrams for proposals, documentation, and architecture reviews.

⚡ Execution Method

Run the Python directly to generate the image, and keep the image but do not leave a throwaway .py script behind. The generated file is the deliverable.

Output location (portable). Write to a diagrams/ folder in the current working directory - this works in every tool and on every OS. If you are running in a sandbox that provides /mnt/user-data/outputs (e.g. Claude Code on the web), prefer that. Create the folder first.

POSIX shells (Claude Code, Cursor, Linux/macOS - bash/zsh):

mkdir -p diagrams
python3 << 'EOF'
from diagrams import Diagram
from diagrams.azure.compute import AKS
from diagrams.azure.database import CosmosDb

with Diagram("My Architecture", filename="diagrams/architecture", show=False, outformat="png"):
    AKS("aks-prod") >> CosmosDb("cosmos-prod")
EOF

Windows PowerShell (e.g. GitHub Copilot on Windows - no heredoc): write a short script, run it, then delete it so nothing is left behind:

New-Item -ItemType Directory -Force diagrams > $null
@'
from diagrams import Diagram
from diagrams.azure.compute import AKS
from diagrams.azure.database import CosmosDb
with Diagram("My Architecture", filename="diagrams/architecture", show=False, outformat="png"):
    AKS("aks-prod") >> CosmosDb("cosmos-prod")
'@ | Set-Content _diagram.py; python _diagram.py; Remove-Item _diagram.py

Canned patterns (cross-platform) - use the bundled generator instead of writing code:

python scripts/generate_diagram.py --list                       # list available patterns
python scripts/generate_diagram.py --pattern <name> --output diagrams/arch

📊 Diagram Types

🔥 Bonus: Generate from Code

Can also create diagrams directly from infrastructure code:

Read the Bicep files in /infra and generate an architecture diagram

Analyze our Terraform modules and create a diagram grouped by subnet

Read azure-pipelines.yml and create a CI/CD pipeline diagram

Supports: Bicep, Terraform, ARM Templates, Azure Pipelines YAML, GitHub Actions

See references/iac-to-diagram.md for detailed prompts and examples.

Prerequisites

# 1) Graphviz - the rendering engine (system package, not pip). Restart the terminal after.
winget install -e --id Graphviz.Graphviz   # Windows  (or: choco install graphviz)
brew install graphviz                       # macOS
sudo apt-get install -y graphviz            # Linux (Debian/Ubuntu)

# 2) Python library (a virtual environment is recommended):
pip install "diagrams>=0.25.1"
# optional extras: matplotlib (timeline/Gantt/wireframe), cairosvg (portable SVG)

Quick Start

from diagrams import Diagram, Cluster, Edge
from diagrams.azure.compute import FunctionApps, AKS, AppServices
from diagrams.azure.network import ApplicationGateway, LoadBalancers
from diagrams.azure.database import CosmosDb, SQLDatabases, CacheForRedis
from diagrams.azure.storage import BlobStorage
from diagrams.azure.integration import LogicApps, ServiceBus, APIManagement
from diagrams.azure.security import KeyVaults
from diagrams.azure.identity import ActiveDirectory
from diagrams.azure.ml import CognitiveServices

with Diagram("Azure Solution Architecture", show=False, direction="TB"):
    users = ActiveDirectory("Users")
    
    with Cluster("Frontend"):
        gateway = ApplicationGateway("App Gateway")
        web = AppServices("Web App")
    
    with Cluster("Backend"):
        api = APIManagement("API Management")
        functions = FunctionApps("Functions")
        aks = AKS("AKS")
    
    with Cluster("Data"):
        cosmos = CosmosDb("Cosmos DB")
        sql = SQLDatabases("SQL Database")
        redis = CacheForRedis("Redis Cache")
        blob = BlobStorage("Blob Storage")
    
    with Cluster("Integration"):
        bus = ServiceBus("Service Bus")
        logic = LogicApps("Logic Apps")
    
    users >> gateway >> web >> api
    api >> [functions, aks]
    functions >> [cosmos, bus]
    aks >> [sql, redis]
    bus >> logic >> blob

Supported Diagram Types

Azure Service Categories

See references/azure-components.md for the complete list of 800+ components.

Common Architecture Patterns

Web Application (3-Tier)

from diagrams.azure.network import ApplicationGateway
from diagrams.azure.compute import AppServices
from diagrams.azure.database import SQLDatabases

gateway >> AppServices("Web") >> SQLDatabases("DB")

Microservices with AKS

from diagrams.azure.compute import AKS, ACR
from diagrams.azure.network import ApplicationGateway
from diagrams.azure.database import CosmosDb

gateway >> AKS("Cluster") >> CosmosDb("Data")
ACR("Registry") >> AKS("Cluster")

Serverless / Event-Driven

from diagrams.azure.compute import FunctionApps
from diagrams.azure.integration import EventGridTopics, ServiceBus
from diagrams.azure.storage import BlobStorage

EventGridTopics("Events") >> FunctionApps("Process") >> ServiceBus("Queue")
BlobStorage("Trigger") >> FunctionApps("Process")

Data Platform

from diagrams.azure.analytics import DataFactories, Databricks, SynapseAnalytics
from diagrams.azure.storage import DataLakeStorage

DataFactories("Ingest") >> DataLakeStorage("Lake") >> Databricks("Transform") >> SynapseAnalytics("Serve")

Hub-Spoke Networking

from diagrams.azure.network import VirtualNetworks, Firewall, VirtualNetworkGateways

with Cluster("Hub"):
    firewall = Firewall("Firewall")
    vpn = VirtualNetworkGateways("VPN")
    
with Cluster("Spoke 1"):
    spoke1 = VirtualNetworks("Workload 1")
    
spoke1 >> firewall

Connection Syntax

# Basic connections
a >> b                              # Simple arrow
a >> b >> c                         # Chain
a >> [b, c, d]                      # Fan-out (one to many)
[a, b] >> c                         # Fan-in (many to one)

# Labeled connections
a >> Edge(label="HTTPS") >> b       # With label
a >> Edge(label="443") >> b         # Port number

# Styled connections
a >> Edge(style="dashed") >> b      # Dashed line (config/secrets)
a >> Edge(style="dotted") >> b      # Dotted line
a >> Edge(color="red") >> b         # Colored
a >> Edge(color="red", style="bold") >> b  # Combined

# Bidirectional
a >> Edge(label="sync") << b        # Two-way
a - Edge(label="peer") - b          # Undirected

Diagram Attributes

with Diagram(
    "Title",
    show=False,                    # Don't auto-open
    filename="output",             # Output filename (no extension)
    direction="TB",                # TB, BT, LR, RL
    outformat="png",               # png (default, portable), svg, jpg, pdf
    graph_attr={
        "splines": "spline",       # Curved edges
        "nodesep": "1.0",          # Horizontal spacing
        "ranksep": "1.0",          # Vertical spacing
        "pad": "0.5",              # Graph padding
        "bgcolor": "white",        # Background color
    }
):

Clusters (Grouping)

with Cluster("Resource Group"):
    with Cluster("Subnet A"):
        vm1 = VM("VM 1")
        vm2 = VM("VM 2")
    
    with Cluster("Subnet B"):
        db = SQLDatabases("Database")

Cluster styling:

with Cluster("Styled", graph_attr={"bgcolor": "#E8F4FD", "style": "rounded"}):

Troubleshooting

Overlapping Nodes

Increase spacing for complex diagrams:

graph_attr={
    "nodesep": "1.2",   # Horizontal (default 0.25)
    "ranksep": "1.2",   # Vertical (default 0.5)
    "pad": "0.5"
}

Floating Edge Labels

Use xlabel instead of label:

# Instead of Edge(label="text")
a >> Edge(xlabel="text") >> b

Excessive Whitespace

Compress the output:

graph_attr={"pad": "0.2", "margin": "0", "ratio": "compress"}

Force Horizontal Alignment

Use subgraphs with same rank:

with Diagram(...):
    # These will be on the same horizontal level
    with Cluster("") as same_level:
        same_level.dot.body.append('rank=same')
        a = ServiceA("A")
        b = ServiceB("B")

See references/preventing-overlaps.md for detailed guidance.

Output Location

Save to a diagrams/ folder in the working directory (portable across tools and OSes), or to /mnt/user-data/outputs when running in a sandbox that provides it. Create the folder first with mkdir -p diagrams (POSIX) or New-Item -ItemType Directory -Force diagrams (PowerShell).

with Diagram("Name", show=False, filename="diagrams/architecture", outformat="png"):
    # ...

⚠️ CRITICAL: Professional Output Standards

The Key Setting: labelloc='t'

To keep labels inside cluster boundaries with the diagrams library, put labels ABOVE icons:

node_attr = {
    "fontname": "Arial Bold",
    "fontsize": "11",
    "labelloc": "t",  # KEY: Labels at TOP - stays inside clusters!
}

with Diagram("Title", node_attr=node_attr, ...):
    # Your diagram code

Full Professional Template

from diagrams import Diagram, Cluster, Edge
from diagrams.azure.compute import AKS
from diagrams.azure.database import SQLDatabases

graph_attr = {
    "bgcolor": "white",
    "pad": "0.8",
    "nodesep": "0.9",
    "ranksep": "0.9",
    "splines": "spline",
    "fontname": "Arial Bold",
    "fontsize": "16",
    "dpi": "200",              # High resolution
}

node_attr = {
    "fontname": "Arial Bold",  # Bold for readability
    "fontsize": "11",
    "labelloc": "t",           # Labels ABOVE icons - KEY!
}

cluster_style = {"margin": "30", "fontname": "Arial Bold", "fontsize": "14"}

with Diagram("My Architecture", 
             direction="TB",
             graph_attr=graph_attr,
             node_attr=node_attr):
    
    with Cluster("Data Tier", graph_attr=cluster_style):
        sql = SQLDatabases("sql-myapp-prod\nS3 tier")

Professional Standards Checklist

⚠️ ALWAYS review the output image before delivering. If ANY text is outside boxes, increase margins or simplify clusters.

Scripts

Reference Files

Source: cmb211087/azure-diagrams-skill — distributed by TomeVault.