Security · System Administration
Harden SSH and require key-based login
Introduce per-user keys, validate a drop-in, test a second session, and only then disable password and root login.
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System Administration · Security
Create remote, versioned backups with rsync and SSH
Use a dedicated SSH identity, dry-run transfers, build hard-linked snapshots, enforce retention, and test restore.
Security · Services & Applications
Protect SSH and web authentication with Fail2ban
Use local jail overrides, verify filters against real logs, test bans safely, and retain an unban path.
System Administration · Security
Perform an initial Ubuntu Server setup and security hardening
Create a named administrator, prove key-based recovery access, patch the host, restrict SSH, enable a host firewall, and verify time and exposed services.