From 8efced5bd602c0ab9895819088966f4471585097 Mon Sep 17 00:00:00 2001
From: sbanszky <sbanszky@noreply.localhost>
Date: Thu, 4 Dec 2025 15:46:44 +0000
Subject: [PATCH] Add SRE-DevOps-engineer.signature

---
 SRE-DevOps-engineer.signature | 285 ++++++++++++++++++++++++++++++++++
 1 file changed, 285 insertions(+)
 create mode 100644 SRE-DevOps-engineer.signature

diff --git a/SRE-DevOps-engineer.signature b/SRE-DevOps-engineer.signature
new file mode 100644
index 0000000..ce9c209
--- /dev/null
+++ b/SRE-DevOps-engineer.signature
@@ -0,0 +1,285 @@
+Below is the deep, real-world view** of how a **strong SRE/DevOps engineer sits inside a multi–data center (multi-DC) environment built on:
+SRE-DevOps-engineer 
+* MAAS for bare-metal lifecycle
+* Proxmox** for virtualization
+* OpenStack for cloud/IaaS
+* Dedicated networking (L2/L3/VLAN/BGP/EVPN)
+* Automation + Observability spanning all layers
+
+This is the true role in a modern organization operating multiple sites, GPUs, hybrid workloads, and self-service infrastructure.
+
+---
+
+# 🧭 1. **Where the SRE/DevOps Sits in the Architecture**
+
+A strong SRE/DevOps is positioned **between hardware → platform → developers**, as the owner of the **full infrastructure lifecycle**.
+
+```
+ [ Developers / ML / Platform Teams ]
+                 ▲
+                 │ Self-service, APIs, IaC
+                 ▼
+       ┌──────────────────────────┐
+       │ Strong SRE/DevOps Owner │  ◄── Reliability, Automation, Architecture
+       └──────────────────────────┘
+       ▲            ▲             ▲
+       │            │             │
+ [MAAS Bare Metal] [Proxmox]   [OpenStack]
+ [Cluster Setup ]  [VM Infra]  [Cloud IaaS]
+       ▲            ▲             ▲
+       └────────────┴─────────────┘
+                  ▼
+           Network / Storage
+                  ▼
+         Physical DC Infrastructure
+```
+
+---
+
+# 🧱 2. **The SRE/DevOps owns the entire stack end-to-end**
+
+## **A. Bare-Metal Layer (MAAS / Ironic / PXE)**
+
+The strong SRE/DevOps is responsible for:
+
+* Multi-DC MAAS region/rack-controller architecture
+* PXE → Preseed → Cloud-init → config mgmt
+* Golden images for Ubuntu (Proxmox/OpenStack nodes)
+* RAID configuration, NIC bonding, BIOS/firmware standards
+* GPU detection, PCIe topology validation
+* Integrating MAAS with CMDB, billing, compute tracking, GPU inventory
+
+**Why critical?**
+This defines hardware bootstrap & repeatability. Every DC depends on it.
+
+---
+
+## **B. Virtualization Layer (Proxmox Clusters)**
+
+The SRE/DevOps maintains:
+
+* Multi-node Proxmox clusters per DC
+* Shared storage pools (Ceph, ZFS replication, NVMe tiers)
+* High availability
+* Lifecycle automation for templates, images, API-based VM creation
+* Terraform integration
+* Networking: bonds, bridges, VLAN tagging, VRRP, routing domains
+
+**Why important?**
+Proxmox often hosts internal systems, CI/CD, observability, runners, and even OpenStack control nodes.
+
+---
+
+## **C. Cloud Layer (OpenStack)**
+
+The SRE/DevOps is responsible for:
+
+* Kolla-Ansible lifecycle (deploy, upgrade, rollback)
+* Nova, Neutron, Glance, Keystone, Cinder architectures
+* Multi-DC regions/availability zones
+* Underlay support: L2/L3, MTU, VXLAN, BGP EVPN, DHCP/DNS
+* API endpoints, load balancers, certificate rotation
+* Quota management, capacity planning
+* GPU flavors, PCI passthrough, SR-IOV networks
+
+**Why important?**
+OpenStack provides elastic compute + GPU pools for internal workloads.
+
+---
+
+# 🕸️ 3. **SRE/DevOps Responsibilities Across Multi-DC**
+
+## **A. Multi-DC Strategy & Standardization**
+
+Across 3–10 DCs, the strong SRE/DevOps ensures:
+
+* Consistent **naming conventions**, network CIDRs, VLAN plans
+* Identical MAAS rack-controller layout
+* Same Proxmox cluster topology
+* Same OpenStack region layout
+* Unified OS images, configs, automation, observability patterns
+* DC-to-DC failover tested and documented
+* Common CI/CD pipeline for infra changes
+
+This is architectural leadership.
+
+---
+
+## **B. Networking Integration**
+
+A strong SRE/DevOps is not a network engineer—but understands enough to architect the underlay/overlay needs:
+
+* VLAN allocation for provisioning, storage, tenants
+* Spine-leaf fabric requirements (MTU, VTEP placements)
+* Routing for MAAS DHCP/TFTP
+* BGP, EVPN, VRRP/Keepalived, LACP bundles
+* Multicast needs for Ceph or Proxmox clusters
+* Tenant isolation (OpenStack Neutron)
+
+You bridge **compute** and **network**, ensuring both work without finger-pointing.
+
+---
+
+## **C. Automation & GitOps Ownership**
+
+Everything from:
+
+* MAAS commissioning
+* Proxmox cluster creation
+* OpenStack environment provisioning
+* Network configs
+* Observability stack deployments
+
+…is defined as **IaC** and deployed via:
+
+* GitLab/GitHub Actions
+* Terraform
+* Ansible
+* Python automation libraries
+* Event-driven workflows (webhooks, APIs)
+
+The strong SRE turns the entire infrastructure into a **code forest**, not a collection of manual operations.
+
+---
+
+## **D. Reliability Engineering Layer**
+
+Owns:
+
+* SLOs for control plane components
+* Prometheus/Grafana dashboards spanning MAAS, hypervisors, OpenStack, networks
+* Alerting strategy
+* Runbooks + automated remediation
+* Incident response framework
+* Capacity projections across DCs (CPU/GPU/NVMe/RAM/network)
+
+This is what makes the difference between a *DevOps engineer* and a **strong SRE**.
+
+---
+
+# ⚙️ 4. **How the SRE/DevOps Interacts with Each Layer (Detailed)**
+
+---
+
+# **Layer 1 — Hardware (Bare-metal servers)**
+
+### You ensure:
+
+* consistent hardware standards
+* automated testing/commissioning
+* BIOS/firmware alignment
+* RAID and BMC integration
+* DC racks follow a uniform provisioning model
+
+---
+
+# **Layer 2 — MAAS Region Controllers**
+
+### You design:
+
+* Region ↔ Rack hierarchy
+* HA for MAAS API
+* DHCP/TFTP separation per DC
+* Multi-DC image mirrors
+* Secure API integration with downstream systems
+* Lifecycle automation from “server purchased” → “in production”
+
+---
+
+# **Layer 3 — Proxmox Virtualization**
+
+### You own:
+
+* cluster deployment automation
+* storage pools (Ceph, ZFS)
+* backup/restore strategy
+* VM template pipeline
+* Terraform-driven VM creation
+* GPU virtualization, passthrough, SR-IOV setups
+
+---
+
+# **Layer 4 — OpenStack Cloud**
+
+### You architect:
+
+* multi-region API
+* Keystone federation
+* Nova scheduling across DCs and AZs
+* Neutron routing domains
+* Cinder backends, replication
+* Glance image replication
+* CI/CD for Kolla upgrades
+* Observability for every control plane service
+
+---
+
+# **Layer 5 — Networking Integration**
+
+### You interface deeply with:
+
+* BGP (underlay and overlay)
+* EVPN-VXLAN
+* VLAN-to-tenant isolation
+* Proxmox/MAAS provisioning networks
+* OpenStack Neutron overlays
+* DC interconnects (L2 extensions, MPLS, routing)
+
+You don’t configure all routers—but you design the service topology and requirements.
+
+---
+
+# **Layer 6 — Observability & Operations**
+
+### You build:
+
+* Prometheus federation
+* Loki/ELK pipelines
+* GPU telemetry exporters
+* DC health dashboards
+* Error budget reports
+* Synthetic probes for OpenStack APIs
+* Capacity dashboards (CPU/GPU/storage per DC)
+
+---
+
+# **Layer 7 — Self-service Interfaces**
+
+You provide:
+
+* VM creation portals (via Proxmox API or Terraform Cloud)
+* Bare-metal on-demand via MAAS API
+* GPU cloud flavors via OpenStack API
+* Internal developer services (logging, metrics, backups, secrets)
+
+This is what **developers and ML engineers see**.
+
+---
+
+# 💼 5. **The Mission of a Strong SRE in Multi-DC Environments**
+
+### **You build a unified infrastructure fabric across all DCs.**
+
+Your goals:
+
+✔ Zero manual provisioning
+✔ Zero snowflake clusters
+✔ Infrastructure reproducible from Git
+✔ All DCs behave identically
+✔ High availability across regions
+✔ Stable, predictable performance for GPU workloads
+✔ Automated OS, hypervisor, and control-plane lifecycle
+✔ Capacity planning, telemetry, and self-healing
+✔ Clear SLIs/SLOs for infra services
+✔ Security controls embedded in workflows
+
+This is the **modern definition** of SRE excellence.
+
+---
+
+# 📌 6. One sentence summary
+
+**A strong SRE/DevOps is the architect and owner of the entire infrastructure lifecycle across multi-DC bare-metal, virtualization, cloud, networking, and automation, ensuring everything is reproducible, observable, reliable, and scalable.**
+
+---
+