linux

swap

https://help.ubuntu.com/community/SwapFaq

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/installation_guide/s2-diskpartrecommend-ppc#id4394007

disk io speed

dd count=1000 bs=1M if=/dev/zero of=./test.img

Enable sudo without password

sudo visudo

At the end of the /etc/sudoers file add this line:

All command <username> ALL=(ALL) NOPASSWD:ALL

Custom command <username> ALL=(ALL) NOPASSWD:/usr/bin/nmcli,/bin/cat,/bin/systemctl