Configuring the Linux 11G R2 RAC NTP service

When installing an Oracle 11g RAC, we need to configure the NTP service. There are many ways to configure clock synchronization in the case of virtual machines, either using the VMware-brought clock synchronization feature or directly using a local node as a time server. This article describes a clock server that directly configures NTP mode.

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2. 1. View the two-node hosts configuration
4. [[Email protected] ~] # cat/etc/hosts
6. # Don't remove the following line, or various programs
8. # that require network functionality would fail.
10. #127.0.0.1 localhost.localdomain localhost
12. #::1 localhost6.localdomain6 Localhost6
16. 127.0.0.1 localhost.szdb.com localhost
18. # public Eth0
20. 192.168.7.71 node1.szdb.com node1
22. 192.168.7.72 node2.szdb.com node2
26. #Private eth1
28. 10.10.7.71 node1-priv.szdb.com node1-priv
30. 10.10.7.72 node2-priv.szdb.com node2-priv
34. #Virtual
36. 192.168.7.81 node1-vip.szdb.com node1-vip
38. 192.168.7.82 node2-vip.szdb.com node2-vip
42. 2. Verify that the NTP packets for each node are installed
44. [Email protected] ~]$ Rpm-qa | grep NTP
46. ntp-4.2. 2p1-9.el5_4. 1
48. chkfontpath-1.10. 1-1.1 #这个是和字体有关, non-NTP package
50. [[email protected] ~]$ ssh node2 Rpm-qa | grep NTP
52. ntp-4.2. 2p1-9.el5_4. 1
54. chkfontpath-1.10. 1-1.1 #这个是和字体有关, non-NTP package
58. 3. Edit the two-node ntp.conf file
60. [Email protected] ~]$ Su-root
62. Password:
64. [[Email protected] ~] # vi/etc/ntp.conf
68. #New NTP server added by Robinson
70. Server 127.127. 1.0 prefer # Add a preferred clock server
72. Restrict 192.168. 7.0 Mask 255.255. 255.255 nomodify notrap #只允许192.168.7.* Network Segment Client for time synchronization
74. Broadcastdelay 0.008
78. [[Email protected] ~] # vi/etc/ntp.conf
82. #New NTP server added by Robinson
84. Server 192.168. 7.71 prefer
86. Broadcastdelay 0.008
90. 4. Edit the ntpd parameters of the two node
92. [[Email protected] ~] # vi/etc/sysconfig/ntpd
94. #The following item added by Robinson
96. #Set to ' yes ' to SYCN HW clock after successful ntpdate
98. Sync_hwclock=yes #此选项用于自动校准系统时钟与硬件时钟
100. options="-x-u ntp:ntp-p/var/run/ntpd.pid"
104. #注意理解Linux的时钟类型.  In the Linux system is divided into the system clock and hardware clock.
106. #系统时钟指当前Linux The clock in the kernel, while the hardware clock refers to the BIOS clock, the clock that is powered by the motherboard battery
108. #当Linux启动时, the hardware clock reads the settings of the system clock, and then the system clock operates independently of the hardware clock
112. [[Email protected] ~] # vi/etc/sysconfig/ntpd
114. The following item added by Robinson
116. Sync_hwclock=yes
118. options="-x-u ntp:ntp-p/var/run/ntpd.pid"
122. 5. Configure NTP self-start service
124. [[Email protected] ~] # chkconfig NTPD on
126. [[Email protected] ~] # chkconfig NTPD on
132. 6. Start the NTP service on the two node
134. [[Email protected] ~] # service NTPD Stop
136. Shutting down NTPD: [FAILED]
138. [[Email protected] ~] # service NTPD start
140. Ntpd:synchronizing with Time server: [FAILED]
142. Starting ntpd: [OK]
146. [[Email protected] ~] # service NTPD Restart
148. Shutting down NTPD: [OK]
150. Ntpd:synchronizing with Time server: [OK]
152. Syncing hardware clock to System time [OK]
154. Starting ntpd: [OK]
158. 7. View NTP status
160. [[Email protected] ~] # ntpq-p
162. Remote refID St T when poll reach delay offset jitter
164. ==============================================================================
166. LOCAL (0).          Locl. ten L 1 0.000 0.000 0.001
170. [[Email protected] ~] # ntpq-p
172. Remote refID St T when poll reach delay offset jitter
174. ==============================================================================
176. Node1.szdb.com.          Init. 0 0.000 0.000 0.000
178. LOCAL (0).          Locl. 1 L 0.000 0.000 0.001
182. #Author: Robinson
184. #Blog: http://blog.csdn.net/robinson_0612
186. You can also use watch ntpq-p to view real-time status
190. 8. NTP related logs
194. [[email protected] tmp] # Cat/var/log/messages | grep ntpd
196. Ext.: http://blog.csdn.net/leshami/article/details/8268079

Configuring the Linux 11G R2 RAC NTP service