博客网站开发背景及意义,中英文企业网站php源码,wordpress oauth2插件,网站备案号信息修改一、ntpd和ntpdate区别
1.ntpd是自动执行的远程更新本地系统时钟的服务#xff0c;是平滑同步#xff1b;
2.ntpdate是手工执行的服务#xff0c;也就是一般用它执行一次本地时间更新#xff0c;如果做成半自动#xff0c;可以写入到crontab自动任务#xff0c;从而变成…一、ntpd和ntpdate区别
1.ntpd是自动执行的远程更新本地系统时钟的服务是平滑同步
2.ntpdate是手工执行的服务也就是一般用它执行一次本地时间更新如果做成半自动可以写入到crontab自动任务从而变成自动任务。可能会因为时钟跃变经历两个相同的时刻导致许多问题如数据库事务等
二、安装包离线下载
rpm地址https://rpmfind.net/linux/rpm2html/search.php
autogen-libopts-5.18-5.el7.x86_64.rpmntp-4.2.6p5-29.el7.centos.2.x86_64.rpmntpdate-4.2.6p5-29.el7.centos.x86_64.rpmcompat-openssl10-1.0.2o-3.el8.x86_64.rpm rpm -ivh autogen-libopts-5.18-5.el7.x86_64.rpm
rpm -ivh ntpdate-4.2.6p5-29.el7.centos.x86_64.rpm
rpm -ivh ntp-4.2.6p5-29.el7.centos.2.x86_64.rpm
安装ntp-4.2.6p5-29.el7.centos.2.x86_64.rpm缺依赖时执行
rpm -ivh ntp-4.2.6p5-29.el7.centos.2.x86_64.rpm --nodeps --force三、配置ntp master
vim /etc/ntp.conf# For more information about this file, see the man pages
# ntp.conf(5), ntp_acc(5), ntp_auth(5), ntp_clock(5), ntp_misc(5), ntp_mon(5).driftfile /var/lib/ntp/drift# Permit time synchronization with our time source, but do not
# permit the source to query or modify the service on this system.
restrict default nomodify notrap nopeer noquery# Permit all access over the loopback interface. This could
# be tightened as well, but to do so would effect some of
# the administrative functions.
restrict 127.0.0.1
restrict ::1
server 127.127.1.0
fudge 127.127.1.0 stratum 10
# Hosts on local network are less restricted.
#restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap# 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 iburst#broadcast 192.168.1.255 autokey # broadcast server
#broadcastclient # broadcast client
#broadcast 224.0.1.1 autokey # multicast server
#multicastclient 224.0.1.1 # multicast client
#manycastserver 239.255.254.254 # manycast server
#manycastclient 239.255.254.254 autokey # manycast client# Enable public key cryptography.
#cryptoincludefile /etc/ntp/crypto/pw# Key file containing the keys and key identifiers used when operating
# with symmetric key cryptography.
keys /etc/ntp/keys# Specify the key identifiers which are trusted.
#trustedkey 4 8 42# Specify the key identifier to use with the ntpdc utility.
#requestkey 8# Specify the key identifier to use with the ntpq utility.
#controlkey 8# Enable writing of statistics records.
#statistics clockstats cryptostats loopstats peerstats# Disable the monitoring facility to prevent amplification attacks using ntpdc
# monlist command when default restrict does not include the noquery flag. See
# CVE-2013-5211 for more details.
# Note: Monitoring will not be disabled with the limited restriction flag.
disable monitor启动ntpd:
systemctl start ntpd
查看状态
systemctl status ntpd
停止ntpd:
systemctl stop ntpd四、配置ntp client
# For more information about this file, see the man pages
# ntp.conf(5), ntp_acc(5), ntp_auth(5), ntp_clock(5), ntp_misc(5), ntp_mon(5).driftfile /var/lib/ntp/drift# Permit time synchronization with our time source, but do not
# permit the source to query or modify the service on this system.
restrict default nomodify notrap nopeer noquery# Permit all access over the loopback interface. This could
# be tightened as well, but to do so would effect some of
# the administrative functions.
restrict 127.0.0.1
restrict ::1
server 172.17.0.3
fudge 172.17.0.3 stratum 10
# Hosts on local network are less restricted.
#restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap# 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 iburst#broadcast 192.168.1.255 autokey # broadcast server
#broadcastclient # broadcast client
#broadcast 224.0.1.1 autokey # multicast server
#multicastclient 224.0.1.1 # multicast client
#manycastserver 239.255.254.254 # manycast server
#manycastclient 239.255.254.254 autokey # manycast client# Enable public key cryptography.
#cryptoincludefile /etc/ntp/crypto/pw# Key file containing the keys and key identifiers used when operating
# with symmetric key cryptography.
keys /etc/ntp/keys# Specify the key identifiers which are trusted.
#trustedkey 4 8 42# Specify the key identifier to use with the ntpdc utility.
#requestkey 8# Specify the key identifier to use with the ntpq utility.
#controlkey 8# Enable writing of statistics records.
#statistics clockstats cryptostats loopstats peerstats# Disable the monitoring facility to prevent amplification attacks using ntpdc
# monlist command when default restrict does not include the noquery flag. See
# CVE-2013-5211 for more details.
# Note: Monitoring will not be disabled with the limited restriction flag.
disable monitor查看时间服务器
ntpq -p
查看偏差时间
ntpdc -c loopinfo
查看ntp状态:
ntpstat
