安裝Oracle 11g RAC時,我們需要配置ntp服務。在使用虛擬機器的情況下對於時鐘同步方式的配置有很多種方式,可以使用vmware內建的時鐘同步功能,也可以直接將本地的一個節點用作時間伺服器。本文介紹直接配置ntp方式的時鐘伺服器。
1、查看兩節點的hosts配置
[root@node1 ~]# cat /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
#127.0.0.1 localhost.localdomain localhost
#::1 localhost6.localdomain6 localhost6
127.0.0.1 localhost.szdb.com localhost
# Public eth0
192.168.7.71 node1.szdb.com node1
192.168.7.72 node2.szdb.com node2
#Private eth1
10.10.7.71 node1-priv.szdb.com node1-priv
10.10.7.72 node2-priv.szdb.com node2-priv
#Virtual
192.168.7.81 node1-vip.szdb.com node1-vip
192.168.7.82 node2-vip.szdb.com node2-vip
2、確認各節點的ntp包已經安裝
[oracle@node1 ~]$ rpm -qa | grep ntp
ntp-4.2.2p1-9.el5_4.1
chkfontpath-1.10.1-1.1 #這個是和字型有關,非ntp包
[oracle@node1 ~]$ ssh node2 rpm -qa | grep ntp
ntp-4.2.2p1-9.el5_4.1
chkfontpath-1.10.1-1.1 #這個是和字型有關,非ntp包
3、編輯兩節點的ntp.conf檔案
[oracle@node1 ~]$ su - root
Password:
[root@node1 ~]# vi /etc/ntp.conf
#New ntp server added by Robinson
server 127.127.1.0 prefer # 添加首選的時鐘伺服器
restrict 192.168.7.0 mask 255.255.255.255 nomodify notrap #只允許192.168.7.*網段的客戶機進行時間同步
broadcastdelay 0.008
[root@node2 ~]# vi /etc/ntp.conf
#New ntp server added by Robinson
server 192.168.7.71 prefer
broadcastdelay 0.008
4、編輯兩節點的ntpd參數
[root@node1 ~]# vi /etc/sysconfig/ntpd
#The following item added by Robinson
#Set to 'yes' to sycn hw clock after successful ntpdate
SYNC_HWCLOCK=yes #此選項用於自動校準系統時鐘與硬體時鐘
OPTIONS="-x -u ntp:ntp -p /var/run/ntpd.pid"
#注意理解Linux的時鐘類型。在Linux系統中分為系統時鐘和硬體時鐘.
#系統時鐘指當前Linux kernel中的時鐘,而硬體時鐘指的是BIOS時鐘,由主板電池供電的那個時鐘
#當Linux啟動時,硬體時鐘會讀取系統時鐘的設定,之後系統時鐘就獨立於硬體時鐘運作
[root@node2 ~]# vi /etc/sysconfig/ntpd
The following item added by Robinson
SYNC_HWCLOCK=yes
OPTIONS="-x -u ntp:ntp -p /var/run/ntpd.pid"
5、配置ntp自啟動服務
[root@node1 ~]# chkconfig ntpd on
[root@node2 ~]# chkconfig ntpd on
6、在兩節點啟動ntp服務
[root@node1 ~]# service ntpd stop
Shutting down ntpd: [FAILED]
[root@node1 ~]# service ntpd start
ntpd: Synchronizing with time server: [FAILED]
Starting ntpd: [ OK ]
[root@node2 ~]# service ntpd restart
Shutting down ntpd: [ OK ]
ntpd: Synchronizing with time server: [ OK ]
Syncing hardware clock to system time [ OK ]
Starting ntpd: [ OK ]
7、查看ntp狀態
[root@node1 ~]# ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
LOCAL(0) .LOCL. 10 l 40 64 1 0.000 0.000 0.001
[root@node2 ~]# ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
node1.szdb.com .INIT. 16 u 60 64 0 0.000 0.000 0.000
LOCAL(0) .LOCL. 10 l 59 64 1 0.000 0.000 0.001
#Author : Robinson
也可以使用watch ntpq -p方式查看即時狀態
8、ntp的相關日誌
[root@bigboy tmp]# cat /var/log/messages | grep ntpd
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