References
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Secure a new Linux VPS without losing access
Use these checks after deploying a Linux VPS and before opening it to users. They suit a fresh De...
Troubleshoot VPS DNS failures, blocked ports and timeouts
Start with one failing connection: which application, source machine, destination hostname or IP,...
Find what is using disk space on a Linux VPS
Measure the affected filesystem A full Linux filesystem can stop databases, package updates and a...
Investigate a failing Linux application with systemd
Identify the service and preserve its evidence A systemd restart policy can recover an applicatio...
Set up SSH keys without locking yourself out
Prepare a recovery route Use a separate SSH key for each administrator or device. The private key...
Plan automatic security updates on Debian and Ubuntu
Check the operating system and recovery copy Automatic security updates reduce the time a known v...
Troubleshoot Nginx 502 and 504 errors on your VPS
Identify which component returned the error A gateway error can originate from Nginx, an applicat...
Check fstab and missing mounts before rebooting Linux
A wrong filesystem entry can turn a routine reboot into emergency mode. These checks are for an a...