Useful howtos

NGINX

Configs

NGINX underscores in headers

Cli commands

Clean Linux DNS cache
Clean MAC DNS cache
Clean Windows DNS cache

LINUX

Enable Linux in Windows OS

Linux subsystem in Windows OS

Ansible

Downgrading Ansible Engine on CentOS 7

Mail Subsystem

Spamassasin Manual Learning

sudo

Sudo nopasswd

Networking

cisco

SYS-4-CONFIG_RESOLVE_FAILURE