Tutorial: Run platform diagnosis

Goal: Produce a repeatable health baseline and know which failures are urgent.

Steps

yunohost diagnosis run
yunohost diagnosis show
# or filter categories after you know which ones matter on this host
df -h /
systemctl --failed
fail2ban-client status

How to read it

Area	If it fails	Go to
DNS / HTTP	Public name or cert	Renew certificate, domains ref
Mail	Ports or reverse DNS	Recover mail
Services	dead units	Full outage
Disk	high use%	Routine maintenance

Success criteria

• [ ] Diagnosis completed without CLI crash
• [ ] Failed systemd units reviewed
• [ ] Disk % recorded

Schedule: weekly with routine maintenance.