Update SRE-DevOps-engineer.role
This commit is contained in:
285
SRE-DevOps-engineer.role
Normal file
285
SRE-DevOps-engineer.role
Normal file
@@ -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:
|
||||
|
||||
* 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.**
|
||||
|
||||
---
|
||||
|
||||
Reference in New Issue
Block a user