Update tech_docs/Jinja2.md
This commit is contained in:
@@ -159,4 +159,476 @@ Your Jinja2 mastery isn’t about "writing templates"—it’s about **designing
|
||||
2. **Shape standards** for infrastructure-as-code.
|
||||
3. **Lead the next wave** of low-code DevOps tools.
|
||||
|
||||
**Next Step**: Pick one high-leverage project (e.g., "Templated Data Mesh") and own it end-to-end. I’ll help you architect it!
|
||||
**Next Step**: Pick one high-leverage project (e.g., "Templated Data Mesh") and own it end-to-end. I’ll help you architect it!
|
||||
|
||||
---
|
||||
|
||||
### **Jinja2 for Network Engineers: Automating the Boring, Scaling the Complex**
|
||||
*(A tactical guide to templating network configs—no fluff, just CLI-ready examples.)*
|
||||
|
||||
---
|
||||
|
||||
## **1. Immediate Wins with Jinja2 in Networking**
|
||||
### **A. Device Config Templates (Cisco/Juniper/Aruba)**
|
||||
**Problem**: Manually editing `interface`, `ACL`, or `BGP` configs for each device is error-prone.
|
||||
**Solution**: Jinja2 + YAML variables.
|
||||
|
||||
#### **Example: Standardized Interface Configs**
|
||||
**`templates/cisco_interface.j2`**
|
||||
```jinja2
|
||||
interface {{ interface.name }}
|
||||
description {{ interface.description | default("UPLINK") }}
|
||||
{% if interface.vlan %}
|
||||
switchport access vlan {{ interface.vlan }}
|
||||
{% endif %}
|
||||
{% if interface.trunk %}
|
||||
switchport mode trunk
|
||||
switchport trunk allowed vlan {{ interface.trunk.vlans | join(',') }}
|
||||
{% endif %}
|
||||
ip address {{ interface.ip }}/{{ interface.mask }}
|
||||
```
|
||||
|
||||
**`vars/switch01.yml`**
|
||||
```yaml
|
||||
interface:
|
||||
name: GigabitEthernet0/1
|
||||
description: "Core Uplink to Router01"
|
||||
trunk:
|
||||
vlans: [10, 20, 30]
|
||||
ip: 192.168.1.1
|
||||
mask: 24
|
||||
```
|
||||
|
||||
**Render it**:
|
||||
```bash
|
||||
# Install jinja-cli if needed: pip install jinja2-cli
|
||||
jinja2 templates/cisco_interface.j2 vars/switch01.yml > configs/switch01.cfg
|
||||
```
|
||||
|
||||
**Output**:
|
||||
```text
|
||||
interface GigabitEthernet0/1
|
||||
description Core Uplink to Router01
|
||||
switchport mode trunk
|
||||
switchport trunk allowed vlan 10,20,30
|
||||
ip address 192.168.1.1/24
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
### **B. Bulk ACL Generation**
|
||||
**Problem**: Managing 50+ ACL rules across devices.
|
||||
**Solution**: Define rules in YAML, template with loops.
|
||||
|
||||
**`templates/acl.j2`**
|
||||
```jinja2
|
||||
ip access-list extended {{ acl.name }}
|
||||
{% for rule in acl.rules %}
|
||||
{{ rule.action }} {{ rule.protocol }} {{ rule.src }} {{ rule.dst }} eq {{ rule.port }}
|
||||
{% endfor %}
|
||||
```
|
||||
|
||||
**`vars/firewall_rules.yml`**
|
||||
```yaml
|
||||
acl:
|
||||
name: INBOUND_WEB
|
||||
rules:
|
||||
- action: permit
|
||||
protocol: tcp
|
||||
src: any
|
||||
dst: 10.0.0.0/24
|
||||
port: 80
|
||||
- action: deny
|
||||
protocol: udp
|
||||
src: 192.168.1.100
|
||||
dst: any
|
||||
port: 53
|
||||
```
|
||||
|
||||
**Render it**:
|
||||
```bash
|
||||
jinja2 templates/acl.j2 vars/firewall_rules.yml
|
||||
```
|
||||
|
||||
**Output**:
|
||||
```text
|
||||
ip access-list extended INBOUND_WEB
|
||||
permit tcp any 10.0.0.0/24 eq 80
|
||||
deny udp 192.168.1.100 any eq 53
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## **2. Advanced Use Cases (For Your Skillset)**
|
||||
### **A. Multi-Vendor Configs (Cisco → Juniper)**
|
||||
**Problem**: Same network design, different CLI syntax.
|
||||
**Solution**: Single YAML source → vendor-specific templates.
|
||||
|
||||
**`vars/ospf.yml`**
|
||||
```yaml
|
||||
ospf:
|
||||
process_id: 100
|
||||
areas:
|
||||
- id: 0
|
||||
networks: ["10.0.0.0/24", "192.168.1.0/24"]
|
||||
```
|
||||
|
||||
**`templates/cisco_ospf.j2`**
|
||||
```jinja2
|
||||
router ospf {{ ospf.process_id }}
|
||||
{% for area in ospf.areas %}
|
||||
network {{ area.networks | join(' ') }} area {{ area.id }}
|
||||
{% endfor %}
|
||||
```
|
||||
|
||||
**`templates/juniper_ospf.j2`**
|
||||
```jinja2
|
||||
protocols {
|
||||
ospf {
|
||||
area {{ ospf.areas[0].id }} {
|
||||
{% for network in ospf.areas[0].networks %}
|
||||
interface {{ network | replace('/','/') }};
|
||||
{% endfor %}
|
||||
}
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
**Render both**:
|
||||
```bash
|
||||
jinja2 templates/cisco_ospf.j2 vars/ospf.yml
|
||||
jinja2 templates/juniper_ospf.j2 vars/ospf.yml
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
### **B. Dynamic Documentation (Visio → Text)**
|
||||
**Problem**: Network diagrams don’t auto-update with config changes.
|
||||
**Solution**: Generate diagrams from Jinja2-powered docs.
|
||||
|
||||
**`templates/network_doc.j2`**
|
||||
```jinja2
|
||||
# Network Design: {{ network.name }}
|
||||
|
||||
## Core Devices
|
||||
{% for device in network.devices %}
|
||||
- **{{ device.name }}** ({{ device.vendor }})
|
||||
- IP: {{ device.mgmt_ip }}
|
||||
- Role: {{ device.role }}
|
||||
{% endfor %}
|
||||
|
||||
## Topology
|
||||
```mermaid
|
||||
graph TD
|
||||
{% for link in network.links %}
|
||||
{{ link.src }} -->|{{ link.type }}| {{ link.dst }}
|
||||
{% endfor %}
|
||||
```
|
||||
```
|
||||
|
||||
**`vars/datacenter.yml`**
|
||||
```yaml
|
||||
network:
|
||||
name: "Primary DC"
|
||||
devices:
|
||||
- name: "CoreSwitch01"
|
||||
vendor: "Cisco"
|
||||
mgmt_ip: "10.0.0.1"
|
||||
role: "Core"
|
||||
- name: "Firewall01"
|
||||
vendor: "Palo Alto"
|
||||
mgmt_ip: "10.0.0.2"
|
||||
role: "Security"
|
||||
links:
|
||||
- src: "CoreSwitch01"
|
||||
dst: "Firewall01"
|
||||
type: "10G Fiber"
|
||||
```
|
||||
|
||||
**Output**:
|
||||
- Auto-generates Markdown with Mermaid diagrams.
|
||||
- Feed into MkDocs for always-updated network docs.
|
||||
|
||||
---
|
||||
|
||||
## **3. Tooling Stack for Network Automation**
|
||||
| **Tool** | **Role** | **Jinja2 Integration** |
|
||||
|--------------------|-----------------------------------|--------------------------------------|
|
||||
| **Ansible** | Push configs to devices. | `template` module renders Jinja2. |
|
||||
| **Python** | Custom scripts. | `jinja2` library (full control). |
|
||||
| **NetBox** | Source of truth (IPs, devices). | Export data → Jinja2 templates. |
|
||||
| **GitLab CI** | Auto-generate configs on changes. | `jinja-cli` in pipelines. |
|
||||
|
||||
---
|
||||
|
||||
## **4. Pro Tips for Networking**
|
||||
### **A. Secret Management**
|
||||
- Use Ansible Vault or `ansible.builtin.copy` with `no_log: true` to embed credentials:
|
||||
```jinja2
|
||||
username {{ vaulted_username }}
|
||||
password {{ vaulted_password }}
|
||||
```
|
||||
|
||||
### **B. Validation**
|
||||
- Lint templates with:
|
||||
```bash
|
||||
python -m jinja2 --check templates/*.j2
|
||||
```
|
||||
|
||||
### **C. Debugging**
|
||||
- Add `{{ debug() }}` to dump variables:
|
||||
```jinja2
|
||||
{# Check what 'interface' looks like #}
|
||||
{{ debug(interface) }}
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## **5. Your Next Steps**
|
||||
1. **Start Small**:
|
||||
- Pick 1 repetitive task (e.g., VLAN assignments) → template it.
|
||||
2. **Scale Up**:
|
||||
- Integrate with NetBox (API) for dynamic data.
|
||||
3. **Automate**:
|
||||
- Git commit → CI pipeline → auto-generate configs.
|
||||
|
||||
**Example Repo**: [network-automation-jinja2](https://github.com/example/network-automation-jinja2)
|
||||
|
||||
---
|
||||
|
||||
### **Why This Matters for Your Job Posting**
|
||||
DataVox wants someone who can **standardize** and **scale** network configs. Jinja2 lets you:
|
||||
- Cut device provisioning time by 80%.
|
||||
- Eliminate typos in ACLs/routing tables.
|
||||
- Document networks **as code** (hello, Visio automation!).
|
||||
|
||||
**You’re not just a Network Engineer—you’re the force multiplier.**
|
||||
|
||||
---
|
||||
|
||||
### **Jinja2 as Your Secret Weapon for Network Solutions Architecture**
|
||||
|
||||
As a Network Solutions Architect at DataVox, your Jinja2 expertise becomes a **force multiplier** for both technical credibility and sales effectiveness. Here's how to weaponize it:
|
||||
|
||||
---
|
||||
|
||||
## **1. Pre-Sales Engineering Dominance**
|
||||
### **A. Rapid Proposal Generation**
|
||||
**Problem:** Manually building BoMs and network designs for each prospect is time-consuming.
|
||||
**Solution:** Jinja2-powered templated proposals.
|
||||
|
||||
**`templates/proposal.j2`**
|
||||
```jinja2
|
||||
# {{ customer.name }} Network Modernization Proposal
|
||||
|
||||
## Core Requirements
|
||||
- **Business Drivers**: {{ use_cases | join(', ') }}
|
||||
- **Compliance Needs**: {{ compliance_requirements | default('None specified') }}
|
||||
|
||||
## Recommended Architecture
|
||||
{% if 'sdwan' in solutions %}
|
||||
### SD-WAN Implementation ({{ vendors.sdwan }})
|
||||
- Edge Devices: {{ device_counts.sdwan }}x {{ models.sdwan }}
|
||||
- License Tier: {{ licensing.sdwan }}
|
||||
{% endif %}
|
||||
|
||||
## Bill of Materials
|
||||
| Item | Qty | Unit Price | Extended |
|
||||
|------|-----|------------|----------|
|
||||
{% for item in bom %}
|
||||
| {{ item.name }} | {{ item.qty }} | ${{ item.unit_price }} | ${{ item.qty * item.unit_price }} |
|
||||
{% endfor %}
|
||||
```
|
||||
|
||||
**Render it:**
|
||||
```bash
|
||||
jinja2 templates/proposal.j2 vars/acme_corp.yml > proposals/acme_2024-03.md
|
||||
```
|
||||
|
||||
**Impact:**
|
||||
- Cut proposal time from 8 hours → 30 minutes
|
||||
- Ensure consistency across all customer deliverables
|
||||
|
||||
---
|
||||
|
||||
### **B. Interactive Demo Environments**
|
||||
**Problem:** Static PowerPoint can't showcase real network flexibility.
|
||||
**Solution:** Live-rendered topology visualizations.
|
||||
|
||||
**`templates/demo_topology.j2`**
|
||||
```jinja2
|
||||
```mermaid
|
||||
graph TD
|
||||
{% for device in demo_network.devices %}
|
||||
{{ device.name }}["{{ device.type }}: {{ device.name }}"]
|
||||
{% endfor %}
|
||||
|
||||
{% for link in demo_network.links %}
|
||||
{{ link.src }} -->|{{ link.bandwidth }}| {{ link.dst }}
|
||||
{% endfor %}
|
||||
```
|
||||
```
|
||||
|
||||
**Sales Play:**
|
||||
1. Load prospect's actual requirements into YAML
|
||||
2. Live-edit during discovery calls ("What if we change this link to 10G?")
|
||||
3. Instant visual update in real-time
|
||||
|
||||
---
|
||||
|
||||
## **2. Technical Design Authority**
|
||||
### **A. Multi-Vendor HLD Templates**
|
||||
**Problem:** Customers want to see Cisco/Palo Alto/Fortinet options.
|
||||
**Solution:** Single design → vendor-specific outputs.
|
||||
|
||||
**`vars/mpls_design.yml`**
|
||||
```yaml
|
||||
network:
|
||||
name: "MPLS Migration"
|
||||
sites:
|
||||
- name: "HQ"
|
||||
routers: 2
|
||||
firewall: "Palo Alto PA-440"
|
||||
- name: "Branch"
|
||||
routers: 1
|
||||
firewall: "FortiGate 100F"
|
||||
```
|
||||
|
||||
**`templates/cisco_design.j2`**
|
||||
```jinja2
|
||||
{% for site in network.sites %}
|
||||
! {{ site.name }} Configuration
|
||||
router bgp 65001
|
||||
neighbor {{ site.ip }} remote-as 65001
|
||||
{% if site.routers > 1 %}
|
||||
! HA Pair Configuration
|
||||
redundancy
|
||||
mode sso
|
||||
{% endif %}
|
||||
{% endfor %}
|
||||
```
|
||||
|
||||
**Differentiation:**
|
||||
- Present **3 vendor options** in the time competitors deliver one
|
||||
- Prove technical depth without manual rework
|
||||
|
||||
---
|
||||
|
||||
### **B. Compliance Automation**
|
||||
**Problem:** Healthcare/finance clients need NIST/HIPAA documentation.
|
||||
**Solution:** Auto-generate compliance matrices.
|
||||
|
||||
**`templates/nist_controls.j2`**
|
||||
```jinja2
|
||||
## NIST 800-53 Compliance Report for {{ customer.name }}
|
||||
|
||||
### AC-2: Account Management
|
||||
Implementation Status: {% if 'active_directory' in solutions %}Compliant{% else %}Not Implemented{% endif %}
|
||||
|
||||
Controls:
|
||||
{% for control in nist_controls %}
|
||||
- [{% if control.implemented %}X{% else %} {% endif %}] {{ control.id }}: {{ control.description }}
|
||||
{% endfor %}
|
||||
```
|
||||
|
||||
**Client Impact:**
|
||||
- Turn compliance from a 3-week audit → 1-hour conversation starter
|
||||
|
||||
---
|
||||
|
||||
## **3. Sales Enablement Systems**
|
||||
### **A. Competitive Battlecards**
|
||||
**Problem:** Engineers waste time recreating vs. Cisco/Fortinet comparisons.
|
||||
**Solution:** Dynamic competitive analysis templates.
|
||||
|
||||
**`templates/battlecard.j2`**
|
||||
```jinja2
|
||||
# Competitive Analysis: {{ our_solution }} vs {{ competitor }}
|
||||
|
||||
## Feature Comparison
|
||||
| Capability | Our Solution | {{ competitor }} |
|
||||
|------------|--------------|------------------|
|
||||
{% for feature in features %}
|
||||
| {{ feature.name }} | {{ feature.our_rating }}/5 | {{ feature.their_rating }}/5 |
|
||||
{% endfor %}
|
||||
|
||||
## Talking Points
|
||||
{% for point in talking_points %}
|
||||
- {{ point }}
|
||||
{% endfor %}
|
||||
```
|
||||
|
||||
**Usage:**
|
||||
```bash
|
||||
jinja2 templates/battlecard.j2 vars/cisco_comparison.yml
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
### **B. ROI Calculators**
|
||||
**Problem:** Customers want hard numbers on OpEx savings.
|
||||
**Solution:** Data-driven Jinja2 templates.
|
||||
|
||||
**`templates/roi.j2`**
|
||||
```jinja2
|
||||
Based on {{ customer.employee_count }} users and {{ customer.bandwidth_usage }}Mbps utilization:
|
||||
|
||||
## 5-Year Savings Projection
|
||||
- **Current Spend**: ${{ current_costs | sum }}
|
||||
- **Proposed Spend**: ${{ proposed_costs | sum }}
|
||||
- **Savings**: ${{ (current_costs | sum) - (proposed_costs | sum) }}
|
||||
|
||||
Breakdown:
|
||||
{% for item in cost_items %}
|
||||
- {{ item.name }}: Reduce from ${{ item.current }} → ${{ item.proposed }}
|
||||
{% endfor %}
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## **4. Implementation Playbook**
|
||||
### **A. Customer Onboarding Kits**
|
||||
**Problem:** Handoffs from sales to delivery teams lose context.
|
||||
**Solution:** Auto-generated runbooks.
|
||||
|
||||
**`templates/onboarding.j2`**
|
||||
```jinja2
|
||||
# {{ customer.name }} Implementation Guide
|
||||
|
||||
## Network Details
|
||||
{% for site in sites %}
|
||||
### {{ site.name }}
|
||||
- Devices: {{ site.devices | join(', ') }}
|
||||
- IP Schema: {{ site.subnet }}
|
||||
{% endfor %}
|
||||
|
||||
## Phase 1 Tasks
|
||||
{% for task in implementation_plan %}
|
||||
{{ loop.index }}. [ ] {{ task }}
|
||||
{% endfor %}
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## **5. Certification Path**
|
||||
### **Architect-Level Jinja2 Mastery**
|
||||
1. **Ansible Certified Content Developer** (Red Hat)
|
||||
2. **Jinja2 + NetBox Integration** (Custom Solutions)
|
||||
3. **Build Your Own:**
|
||||
- Internal "DataVox Templating Standards"
|
||||
- Patentable config generation workflows
|
||||
|
||||
---
|
||||
|
||||
### **Why This Wins Deals**
|
||||
1. **Speed:** Respond to RFPs 5x faster than competitors
|
||||
2. **Precision:** Eliminate errors in BoMs/designs
|
||||
3. **Trust:** Demonstrate technical depth through automation
|
||||
|
||||
**Your New Title:** *"The Architect Who Automates"*
|
||||
|
||||
Want to build the first template? Let's start with:
|
||||
```bash
|
||||
mkdir -p ~/datavox-templates/{vars,templates,output}
|
||||
```
|
||||
|
||||
|
||||
Reference in New Issue
Block a user