大橙子网站建设,新征程启航
为企业提供网站建设、域名注册、服务器等服务
立即同步时间的坏处,影响某些计划任务执行
企业建站必须是能够以充分展现企业形象为主要目的,是企业文化与产品对外扩展宣传的重要窗口,一个合格的网站不仅仅能为公司带来巨大的互联网上的收集和信息发布平台,成都创新互联公司面向各种领域:成都社区文化墙等成都网站设计、成都全网营销推广解决方案、网站设计等建站排名服务。
一、立即同步时间
方法一:
ntpdate ntp.aliyun.com
方法二:重启ntp服务
方法三:重启chrony服务
二、查看ntp和chrony状态
[root@textbox ~]# chronyc sources -v
210 Number of sources = 1
.-- Source mode '^' = server, '=' = peer, '#' = local clock.
/ .- Source state '*' = current synced, '+' = combined , '-' = not combined,
| / '?' = unreachable, 'x' = time may be in error, '~' = time too variable.
|| .- xxxx [ yyyy ] +/- zzzz
|| Reachability register (octal) -. | xxxx = adjusted offset,
|| Log2(Polling interval) --. | | yyyy = measured offset,
|| \ | | zzzz = estimated error.
|| | | \
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^* localhost 3 6 17 2 +62us[ +661us] +/- 88ms
[root@textbox ~]#
[root@textbox ~]# ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
*localhost 119.28.206.193 3 u 41 64 177 0.784 1.195 3656236
三、ntp做服务端的设置
#注释原来的ntp服务器,原来的ntp服务器都是centos.org美国的
[root@textbox ~]# sed '/^server/s/^/#/' /etc/ntp.conf -i
#添加两个aliyun的
[root@textbox ~]# sed '1a server ntp.aliyun.com iburst' /etc/ntp.conf -i
[root@textbox ~]# sed '1a server ntp1.aliyun.com iburst' /etc/ntp.conf -i
#重启服务
[root@textbox ~]# systemctl restart ntpd
#ntp就这么简单,就可以当服务器使用了
[root@textbox ~]# ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
+120.25.115.20 10.137.53.7 2 u 4 64 17 42.560 -8.795 6.944
*203.107.6.88 100.107.25.114 2 u 4 64 17 15.542 -7.021 6.460
#123端口,udp
[root@textbox ~]# ss -lutnp | grep ntp
udp UNCONN 0 0 192.168.38.140:123 *:* users:(("ntpd",pid=61668,fd=19))
udp UNCONN 0 0 127.0.0.1:123 *:* users:(("ntpd",pid=61668,fd=18))
udp UNCONN 0 0 *:123 *:* users:(("ntpd",pid=61668,fd=16))
udp UNCONN 0 0 fe80::69d0:5288:fda9:93ae%ens33:123 :::* users:(("ntpd",pid=61668,fd=21))
udp UNCONN 0 0 ::1:123 :::* users:(("ntpd",pid=61668,fd=20))
udp UNCONN 0 0 :::123 :::* users:(("ntpd",pid=61668,fd=17))
#用另一台服务器测试
[root@linux5 ~]# ntpdate 192.168.38.140
5 Sep 09:17:25 ntpdate[28423]: adjust time server 192.168.38.140 offset -0.007790 sec
四、chrony服务端配置
设置项比ntp多
[root@imooc-nginx ~]# sed '/^server/s/^/#/' /etc/chrony.conf -i
[root@imooc-nginx ~]# sed '1a server ntp.aliyun.com iburst' /etc/chrony.conf -i
[root@imooc-nginx ~]# sed '1a server 0.cn.pool.ntp.org iburst' /etc/chrony.conf -i
[root@imooc-nginx ~]# sed '1a server ntp1.aliyun.com iburst' /etc/chrony.conf -i
#即使当前时服务器未与指定ntp完成时间同步,照样提供服务
[root@imooc-nginx ~]# sed '1a local stratum 10' /etc/chrony.conf -i
#允许哪些服务器同步
[root@imooc-nginx ~]# sed '1a allow 192.168.0.0/16' /etc/chrony.conf -i
[root@imooc-nginx ~]# systemctl restart chronyd
[root@imooc-nginx ~]# systemctl enable chronyd
#查看chronyd状态
[root@imooc-nginx ~]# chronyc sources -v
210 Number of sources = 3
.-- Source mode '^' = server, '=' = peer, '#' = local clock.
/ .- Source state '*' = current synced, '+' = combined , '-' = not combined,
| / '?' = unreachable, 'x' = time may be in error, '~' = time too variable.
|| .- xxxx [ yyyy ] +/- zzzz
|| Reachability register (octal) -. | xxxx = adjusted offset,
|| Log2(Polling interval) --. | | yyyy = measured offset,
|| \ | | zzzz = estimated error.
|| | | \
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^+ 120.25.115.20 2 6 17 4 +766us[ +591us] +/- 21ms
^- 111.230.189.174 2 6 17 4 +98us[ +98us] +/- 49ms
^* 203.107.6.88 2 6 17 4 -187us[ -361us] +/- 16ms
#测试
[root@textbox ~]# ntpdate 192.168.38.154
5 Sep 09:33:25 ntpdate[61810]: adjust time server 192.168.38.154 offset -0.010546 sec
五、自动同步时间两种方式
1、ntpdate ntp.aliyun.com写入计划任务,每小时同步一次
2、所有服务器chrony都开启,其中一台做时间服务器,其他服务器的server都指向它
六、设置时区
[root@textbox ~]# timedatectl set-timezone Asia/Shanghai