NTPNTP 패키지 설치: 먼저 각 가상 서버에 NTP 패키지를 설치sudo yum install ntp /etc/ntp.conf 수정# Use public servers from the pool.ntp.org project.# Please consider joining the pool (http://www.pool.ntp.org/join.html).#server 0.centos.pool.ntp.org iburst#server 1.centos.pool.ntp.org iburst#server 2.centos.pool.ntp.org iburst#server 3.centos.pool.ntp.org iburstserver time.bora.netserver kr.pool.ntp.org NTP 서비스 재시작sys..