安裝Oracle 11g RAC時(shí),我們需要配置ntp服務(wù)。在使用虛擬機(jī)的情況下對(duì)于時(shí)鐘同步方式的配置有很多種方式,可以使用vmware自帶的時(shí)鐘同步功能,也可以直接將本地的一個(gè)節(jié)點(diǎn)用作時(shí)間服務(wù)器。本文介紹直接配置ntp方式的時(shí)鐘服務(wù)器。
1、查看兩節(jié)點(diǎn)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 eth2
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(rèn)各節(jié)點(diǎn)的ntp包已經(jīng)安裝
[oracle@node1 ~]$ rpm -qa | grep ntp
ntp-4.2.2p1-9.el5_4.1
chkfontpath-1.10.1-1.1 #這個(gè)是和字體有關(guān),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(gè)是和字體有關(guān),非ntp包
3、編輯兩節(jié)點(diǎn)的ntp.conf文件
[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(shí)鐘服務(wù)器
restrict 192.168.7.0 mask 255.255.255.255 nomodify notrap #只允許192.168.7.*網(wǎng)段的客戶機(jī)進(jìn)行時(shí)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(jié)點(diǎn)的ntpd參數(shù)
[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(xiàng)用于自動(dòng)校準(zhǔn)系統(tǒng)時(shí)鐘與硬件時(shí)鐘
OPTIONS="-x -u ntp:ntp -p /var/run/ntpd.pid"
#注意理解Linux的時(shí)鐘類(lèi)型。在Linux系統(tǒng)中分為系統(tǒng)時(shí)鐘和硬件時(shí)鐘.
#系統(tǒng)時(shí)鐘指當(dāng)前Linux kernel中的時(shí)鐘,而硬件時(shí)鐘指的是BIOS時(shí)鐘,由主板電池供電的那個(gè)時(shí)鐘
#當(dāng)Linux啟動(dòng)時(shí),硬件時(shí)鐘會(huì)讀取系統(tǒng)時(shí)鐘的設(shè)置,之后系統(tǒng)時(shí)鐘就獨(dú)立于硬件時(shí)鐘運(yùn)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(dòng)服務(wù)
[root@node1 ~]# chkconfig ntpd on
[root@node2 ~]# chkconfig ntpd on
6、在兩節(jié)點(diǎn)啟動(dòng)ntp服務(wù)
[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(tài)
[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
#Blog: http://blog.csdn.net/robinson_0612
也可以使用watch ntpq -p方式查看實(shí)時(shí)狀態(tài)
8、ntp的相關(guān)日志
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[root@bigboy tmp]# cat /var/log/messages | grep ntpd
源自: http://blog.csdn.net/leshami/article/details/8268079