우분투서버 갑자기 연결 끊기고 전원 버튼으로 켜야 하는 현상

알고보니 절전 모드로 들어갔던 문제였습니다...

절전모드 해제

$sudo systemctl mask sleep.target suspend.target hibernate.target hybrid-sleep.target

Created symlink /etc/systemd/system/sleep.target → /dev/null.
Created symlink /etc/systemd/system/suspend.target → /dev/null.
Created symlink /etc/systemd/system/hibernate.target → /dev/null.
Created symlink /etc/systemd/system/hybrid-sleep.target → /dev/null.

절전모드 설정

sudo systemctl unmask sleep.target suspend.target hibernate.target hybrid-sleep.target

Removed /etc/systemd/system/sleep.target.
Removed /etc/systemd/system/suspend.target.
Removed /etc/systemd/system/hibernate.target.
Removed /etc/systemd/system/hybrid-sleep.target.