chrony
Posted dissipate
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prerequisite:
firewalld
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firewall-cmd --state
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firewall-cmd --list-all
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firewall-cmd --zone=public --query-port=123/tcp firewall-cmd --zone=public --query-port=123/udp
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firewall-cmd --zone=public --add-service=ntp --permanent
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firewall-cmd --zone=public --add-port=123-125/tcp --permanent
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firewall-cmd --zone=public --add-port=123/udp --permanent
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firewall-cmd --reload
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firewall-cmd --zone=public --list-service
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firewall-cmd --zone=public --list-port
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firewall-cmd --zone=public --query-service=ntp
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firewall-cmd --zone=public --remove-port=123/tcp --permanent
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/etc/firewalld user profile /usr/lib/firewalld 系统配置文件，预置文件
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firewall-cmd --panic-on reject all packages firewall-cmd --panic-off firewall-cmd --query-panic
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firewall-cmd --get-active-zone
timedatectl
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timedatectl set-ntp true
NTP synchronized:no ntp不能同步时间
chronyc
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A client/server for network time protocol,It was specially designed to support systems with intermittent internet connections.It can also use hardware clocks,system real-time clock or manual input as time references.
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rpm -ql chrony man chrony.conf
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/etc/chrony.conf
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/usr/bin/chronyc
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/usr/sbin/chronyd
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chrony.conf
cp chrony.conf{,.bak}
server ntp.api.bz iburst
server ntp.aliyum.com iburst
all 192.168.3.0/24
deny 192.168.8.0/24
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chronyc
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chronyc -v
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chronyc sources v display information about current sources
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chronyc sourcestats v display statistics about collected measurements
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chronyc activity v check how many NTP sources are online/offline
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chronyc tracking v display system time information
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chronyc clients v Report on clients that have accessed the server
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chronyc ntpdata v Display information about last valid measurement
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/etc/chrony.conf中
定义了本机时间未同步时的stratum为10
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