Friday Deploy.
It was supposed to be a small change. Now you’re the one holding the pager.
It’s always DNS. Until it isn’t.
The app stopped opening after a DNS cleanup. Someone says the server still responds by IP. Please investigate before everyone leaves.
NOC gremlin: I’m the NOC gremlin. I don’t fix things. I watch.
- Elapsed
- 0:00
- Changes
- 0
- Hints
- 0/3
Follow the request
Not yet probedName lookup ↕ local resolver. HTTP(S) → router → proxy → application ↕ database.
Commands run here. The DNS resolver is on the same subnet; reaching the server subnet requires a working default gateway.
Workstation terminal
simulated / no real network callsConnected to workstation 10.42.10.50.
Type help or choose a probe above.
Service consoles: logs proxy, logs backend, logs database, status backend, df backend.
Na, ezt javítsd meg.
Pick what breaks. The lab turns it into an incident with a link you can send. Faults stack: each one hides the ones behind it.
2 faults selected.
A simplified network simulator. Fixed /24 subnets, no DNS cache, no packet loss. Device consoles are available even when the client cannot reach them. Configuration changes are immediate; no real infrastructure is affected.