http://installation.cpiv.com/kb/how-to-block-a-whole-country-via-csf-using-maxminds-geoip-lite-service-ticket-448031
nginx conf for doc root: http://nginx.org/en/docs/dirindex.html
https://lightsail.aws.amazon.com/ls/docs/en_us/articles/create-and-attach-additional-block-storage-disks-linux-unix
https://bobcares.com/blog/setup-openvpn-on-linux/
http://installation.cpiv.com/kb/procedure-to-handle-disk-read-only-issue
https://www.thegeekstuff.com/2008/09/how-to-repair-corrupted-mysql-tables-using-myisamchk/
https://pve.proxmox.com/wiki/Pci_passthrough
https://matthewdeporter.com/proxmox/proxmox-pci-passthrough/
https://forum.proxmox.com/threads/solved-setting-up-multiple-nic-network-and-routing-on-proxmox.81897/
https://forum.proxmox.com/threads/want-to-use-both-my-2-nic-cards-on-my-server.108488/
port 25 blocked: https://support.cpanel.net/hc/en-us/articles/360041074753
http://installation.cpiv.com/kb/increasing-apache-worker-processes-to-a-very-high-value-is-not-a-good-idea
http://installation.cpiv.com/kb/view-atop-history-view-atop-on-certain-time
http://installation.cpiv.com/kb/atop-when-you-need-to-know-exactly-whats-happening-at-the-system-resource-level
http://www.uptimemadeeasy.com/mysql/using-the-mysql-binary-log/
Letsencrypt SSL debug: https://letsdebug.net/
Status of Server Uptime in Server health as per this KB: http://installation.cpiv.com/kb/server-uptime-status-in-audit
Check EOL status from: https://endoflife.software/
Whitelist ip in nginx: https://ubiq.co/tech-blog/how-to-whitelist-ip-in-nginx/
Self-signed ssl on dmain in nginx: https://www.digitalocean.com/community/tutorials/how-to-create-a-self-signed-ssl-certificate-for-nginx-on-centos-7