hermes-skills/skills/devops/hermes-standby-deployment/references/standby-hostname-and-renaming.md

Standby Hostname & OS Renaming

After deploying the standby watchdog script, also rename the standby's OS to match its DNS name.

On the standby box

hostnamectl set-hostname app1-bu.itpropartner.com

Verify with both hostname and hostname -f.

Also rename in the cloud provider API

The cloud provider labels (Hetzner Cloud Console, API server.name) and the OS hostname are separate. Update both:

import urllib.request, json
headers = {'Authorization': f'Bearer {token}', 'Content-Type': 'application/json'}
data = json.dumps({"name": "app1-bu.itpropartner.com"})
req = urllib.request.Request(f'https://api.hetzner.cloud/v1/servers/{SERVER_ID}', data=data.encode(), headers=headers, method='PUT')
urllib.request.urlopen(req, timeout=10)

Why this matters

• The DNS A record, the cloud provider name, and the OS hostname should all agree
• Scripts that check hostname for routing decisions won't break
• The DR documentation references the DNS name — matching OS hostname reduces confusion during failover