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Install Varnish from your distribution's packages (dnf install varnish or apt install varnish), move Apache to port 8080, point Varnish's backend at 127.0.0.1:8080 in /etc/varnish/default.vcl, and make Varnish listen on port 80. Varnish does not handle HTTPS, so put Nginx or Hitch in front of it on port 443. Test with curl -I and look for the X-Varnish and Age headers. On cPanel servers, use NGINX Manager in WHM instead.
Install rkhunter from your distribution's packages (dnf install rkhunter from EPEL on AlmaLinux, Rocky Linux and CloudLinux, or apt install rkhunter on Debian and Ubuntu). Then update its data files with rkhunter --update, record a baseline of your system files with rkhunter --propupd, and scan with rkhunter --check --sk. Set an email address for warnings and let the daily cron job run. Run --propupd again after every system update, or you will get false warnings.
Find the device and its filesystem type with lsblk -f. For ext4, unmount it and run fsck -n /dev/DEVICE to check, then fsck -y /dev/DEVICE to repair. For XFS, the default on AlmaLinux and Rocky Linux, use xfs_repair -n and xfs_repair instead, because fsck does nothing on XFS. The root filesystem cannot be unmounted, so repair it from rescue mode or force a check at the next boot.
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