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26.2. OpenNTPD
上一页 第 26 章 Synchronizes system time using the Network Time Protocol (NTP) 下一页
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26.2. OpenNTPD

http://www.pool.ntp.org/

install
ntpd - Network Time Protocol (NTP) daemon

过程 2526..1. ntp server

  1. # yum install ntp

  2. port

    [root@ntp ~]# netstat -unlnp |grep 123
udp        0      0 192.168.5.5:123             0.0.0.0:*                               10810/ntpd
udp        0      0 172.16.0.5:123              0.0.0.0:*                               10810/ntpd
udp        0      0 192.168.3.5:123             0.0.0.0:*                               10810/ntpd
udp        0      0 127.0.0.1:123               0.0.0.0:*                               10810/ntpd
udp        0      0 0.0.0.0:123                 0.0.0.0:*                               10810/ntpd
udp        0      0 ::1:123                     :::*                                    10810/ntpd
udp        0      0 fe80::225:64ff:fe9a:123     :::*                                    10810/ntpd
udp        0      0 :::123                      :::*                                    10810/ntpd

[root@ntp ~]# lsof -i :123
COMMAND   PID USER   FD   TYPE DEVICE SIZE NODE NAME
ntpd    10810  ntp   16u  IPv4  35921       UDP *:ntp
ntpd    10810  ntp   17u  IPv6  35922       UDP *:ntp
ntpd    10810  ntp   18u  IPv6  35923       UDP [fe80::225:64ff:fe9a:d7e0]:ntp
ntpd    10810  ntp   19u  IPv6  35924       UDP localhost6.localdomain6:ntp
ntpd    10810  ntp   20u  IPv4  35925       UDP localhost.localdomain:ntp
ntpd    10810  ntp   21u  IPv4  35926       UDP nis.example.com:ntp
ntpd    10810  ntp   22u  IPv4  35927       UDP 172.16.0.5:ntp
ntpd    10810  ntp   23u  IPv4  35928       UDP 192.168.5.5:ntp

  3. status

    ntpstat

    [root@subversion ~]# ntpstat
synchronised to local net at stratum 11
   time correct to within 11 ms
   polling server every 1024 s
					
    [root@subversion ~]# ntptrace -n 127.0.0.1
127.0.0.1: stratum 11, offset 0.000000, synch distance 0.010984
					
    [root@subversion ~]# ntpq -p
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
 122.226.192.4   .INIT.          16 u    - 1024    0    0.000    0.000   0.000
 218.75.4.130    .INIT.          16 u    - 1024    0    0.000    0.000   0.000
 www.chinaepg.ne .INIT.          16 u    - 1024    0    0.000    0.000   0.000
*LOCAL(0)        .LOCL.          10 l   60   64  377    0.000    0.000   0.001

  4. http://www.pool.ntp.org/

    vim /etc/ntp.conf
server 2.cn.pool.ntp.org
server 3.asia.pool.ntp.org
server 2.asia.pool.ntp.org
					

  5. # chkconfig ntpd on
# service ntpd start/stop/restart
Ubuntu

ubuntu

sudo apt-get install openntpd
ntpdate
ntpdate
CentOS 7
# yum install ntpdate
# systemctl enable ntpdate
# systemctl start ntpdate
			
# ntpdate 172.16.3.51

或使用

# /usr/libexec/ntpdate-wrapper
CentOS 6

使用 ntpdate 临时更新时间

				
[root@dev1 ~]# ntpdate 192.168.3.5 && hwclock -w
 9 Aug 12:38:22 ntpdate[2538]: step time server 192.168.3.5 offset 3543.674078 sec

另外一个命令 rdate 同样可以达到ntpdate目的，rdate是系统默认安装。

过程 2526..2. ntp client

  1. # yum install ntp
				
					
  2. # chkconfig ntpd on
# service ntpd start				
					
  3. vim /etc/ntp.conf
#server 0.centos.pool.ntp.org
#server 1.centos.pool.ntp.org
#server 2.centos.pool.ntp.org
server 192.168.3.5

ntpd 启动后，不能再使用ntpdate

ntpd.conf / ntp.conf

# $OpenBSD: ntpd.conf,v 1.7 2004/07/20 17:38:35 henning Exp $
# sample ntpd configuration file, see ntpd.conf(5)

# Addresses to listen on (ntpd does not listen by default)
listen on *
#listen on 127.0.0.1
#listen on ::1

# sync to a single server
#server ntp.example.org

# use a random selection of 4 public stratum 2 servers
# see http://twiki.ntp.org/bin/view/Servers/NTPPoolServers
# and http://www.pool.ntp.org/
#server 0.debian.pool.ntp.org
#server 1.debian.pool.ntp.org
#server 2.debian.pool.ntp.org
#server 3.debian.pool.ntp.org

server 0.asia.pool.ntp.org
server 1.asia.pool.ntp.org
server 2.asia.pool.ntp.org
server 3.asia.pool.ntp.org
server 配置

server your_ip_address

server 172.16.0.1
server 172.16.0.2
ntp 安全设置

允许192.168.1.0段访问ntp

restrict default ignore
# Hosts on local network are less restricted.
restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap
ntpstat - show network time synchronisation status
# ntpstat
Unable to talk to NTP daemon. Is it running?
ntpq - standard NTP query program
[root@netkiller nginx]# ntpq -p
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
 LOCAL(0)        .LOCL.          10 l  17d   64    0    0.000    0.000   0.000
#time5.aliyun.co 10.137.38.86     2 u  709 1024  177   48.647    4.163  17.751
+120.25.115.19   10.137.38.86     2 u 1907 1024  376   11.631   -0.173   0.366
-120.25.115.20   10.137.38.86     2 u  324 1024  377   11.701   -0.316   0.299
-time4.aliyun.co 10.137.38.86     2 u 1726 1024  376   12.342   -0.919   0.293
+time6.aliyun.co 10.137.38.86     2 u  629 1024   67   44.500    0.076  10.601
-10.143.33.49    10.137.38.86     2 u  547 1024  377   26.710   -1.764   0.403
-10.143.33.50    10.137.38.86     2 u  654 1024  377   27.091    2.432   0.241
-10.143.33.51    10.137.38.86     2 u  923 1024  377   27.375    1.779   0.337
*10.143.0.44     10.137.38.86     2 u  723 1024  377   28.356    0.080   0.338
+10.143.0.45     10.137.38.86     2 u  479 1024  377   28.081    0.188   0.345
-10.143.0.46     10.137.38.86     2 u  986 1024  377   27.809   -0.777   1.672
 100.100.5.1     .INIT.          16 u    - 1024    0    0.000    0.000   0.000
 100.100.5.2     .INIT.          16 u    - 1024    0    0.000    0.000   0.000
 100.100.5.3     .INIT.          16 u    - 1024    0    0.000    0.000   0.000
 100.100.3.1     .INIT.          16 u    - 1024    0    0.000    0.000   0.000
 100.100.3.2     .INIT.          16 u    - 1024    0    0.000    0.000   0.000
 100.100.3.3     .INIT.          16 u    - 1024    0    0.000    0.000   0.000

-n 禁止DNS解析

[root@iZ621r6pk9aZ nginx]# ntpq -n -p
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
 127.127.1.0     .LOCL.          10 l  17d   64    0    0.000    0.000   0.000
#182.92.12.11    10.137.38.86     2 u  757 1024  177   48.647    4.163  17.751
+120.25.115.19   10.137.38.86     2 u 1955 1024  376   11.631   -0.173   0.366
-120.25.115.20   10.137.38.86     2 u  372 1024  377   11.701   -0.316   0.299
-120.25.108.11   10.137.38.86     2 u 1774 1024  376   12.342   -0.919   0.293
+115.28.122.198  10.137.38.86     2 u  677 1024   67   44.500    0.076  10.601
-10.143.33.49    10.137.38.86     2 u  595 1024  377   26.710   -1.764   0.403
-10.143.33.50    10.137.38.86     2 u  702 1024  377   27.091    2.432   0.241
-10.143.33.51    10.137.38.86     2 u  971 1024  377   27.375    1.779   0.337
*10.143.0.44     10.137.38.86     2 u  771 1024  377   28.356    0.080   0.338
+10.143.0.45     10.137.38.86     2 u  527 1024  377   28.081    0.188   0.345
-10.143.0.46     10.137.38.86     2 u 1034 1024  377   27.809   -0.777   1.672
 100.100.5.1     .INIT.          16 u    - 1024    0    0.000    0.000   0.000
 100.100.5.2     .INIT.          16 u    - 1024    0    0.000    0.000   0.000
 100.100.5.3     .INIT.          16 u    - 1024    0    0.000    0.000   0.000
 100.100.3.1     .INIT.          16 u    - 1024    0    0.000    0.000   0.000
 100.100.3.2     .INIT.          16 u    - 1024    0    0.000    0.000   0.000
 100.100.3.3     .INIT.          16 u    - 1024    0    0.000    0.000   0.000
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第 26 章 Synchronizes system time using the Network Time Protocol (NTP) 起始页 第 27 章 rinetd — internet “redirection server”