yum install -y ntp ntpdate
systemctl start ntpd
systemctl enable ntpd
ntpdate -u -s 0.north-america.pool.ntp.org 1.north-america.pool.ntp.org 2.north-america.pool.ntp.org 3.north-america.pool.ntp.org
systemctl restart ntpd
hwclock -w
timedatectl set-timezone America/Los_Angeles
timedatectl
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