Useful links
80 Linux monitoring tools
Netdata real-time performance and health monitoring
nginx geoip block
apache geoip auth
Watch log in real time
https://www.percona.com/blog/2017/02/09/using-nvme-command-line-tools-to-check-nvme-flash-health/
Monitor IOTOP activity
PDNS slave DNSSEC support
Install openvpn easy way with csf
Linux install root cert
Rebuild currupted RPM database
MiniDLNA issue's