NTP服务器的搭建和使用
由于在做到高可用集群时，对个各节点的时间要求比较严格。因此我们需要配置一个NTP服务器实现高可用集群的的时间同步器。然后将其他的节点时间指向这个ntp，先来创建一个NTP服务器。
[root@localhost ~ ]# rpm -q ntp
ntp-4.2.6p5-1.el6.CentOS.x86_64
由于我们的服务器已经有ntp服务器，那么我们这里边直接使用好了。
[root@localhost ~ ]# rpm -ql ntp
/etc/ntp.conf //配置文件
/etc/ntp/crypto
/etc/ntp/crypto/pw
/etc/rc.d/init.d/ntpd //脚本程序
# vim /etc/ntp.conf
1 # For more information about this file, see the man pages
2 # ntp.conf(5), ntp_acc(5), ntp_auth(5), ntp_clock(5), ntp_misc(5), ntp_mon(5).
3
4 driftfile /var/lib/ntp/drift
5
6 # Permit time synchronization with our time source, but do not
7 # permit the source to query or modify the service on this system.
8 restrict default kod nomodify notrap nopeer noquery
9 restrict -6 default kod nomodify notrap nopeer noquery
10
11 # Permit all access over the loopback interface. This could
12 # be tightened as well, but to do so would effect some of
13 # the administrative functions.
14 restrict 127.0.0.1
15 restrict -6 ::1
16
17 # Hosts on local network are less restricted.
18 restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap //允许其他主机同步时间
19
20 # Use public servers from the pool.ntp.org project.
21 # Please consider joining the pool ().
22 # server 0.centos.pool.ntp.org iburst （默认时间服务器）
23 # server 1.centos.pool.ntp.org iburst （默认时间服务器）
24 # server 2.centos.pool.ntp.org iburst （默认时间服务器）
25 # server 3.centos.pool.ntp.org iburst （默认时间服务器）
26 server 172.16.0.1 （自己添加的）
27 #broadcast 192.168.1.255 autokey # broadcast server
27 #broadcast 192.168.1.255 autokey # broadcast server
28 #broadcastclient # broadcast client
29 #broadcast 224.0.1.1 autokey # multicast server
30 #multicastclient 224.0.1.1 # multicast client
31 #manycastserver 239.255.254.254 # manycast server
32 #manycastclient 239.255.254.254 autokey # manycast client
33 restrict172.16.0.1 nomodify notrap noquery //允许上游时间服务器修改本地时间
34 server127.127.1.0 #local clock
fudge 127.127.1.0 stratum 10
#Enable public key cryptography.
35 #crypto
36
37 includefile /etc/ntp/crypto/pw
38
39 # Key file containing the keys and key identifiers used when operating
40 # with symmetric key cryptography.
41 keys /etc/ntp/keys
42
43 # Specify the key identifiers which are trusted.
44 #trustedkey 4 8 42
45
46 # Specify the key identifier to use with the ntpdc utility.
47 #requestkey 8
48
49 # Specify the key identifier to use with the ntpq utility.
50 #controlkey 8
51
52 # Enable writing of statistics records.
53 #statistics clockstats cryptostats loopstats peerstats
同样是其他节点服务器将时间指向该NTP服务器即可：
restrict 127.0.0.1
restrict -6 ::1
server 172.16.31.10 //ntp指向ntp服务器
restrict 172.16.31.10 nomodify notrap noquery //允许矫正时间
server 127.127.1.0 # local clock
fudge 127.127.1.0 stratum 10
#service ntpd start 即可：
准备各节点：
实验环境
1.时间需要同步，建议使用NTP服务器同步时间并且创建时间同步计划
2.root用户基于密钥认证的时候
3../etc/hosts文件作好IP对应的主机名的解析
解决依赖关系及包的安装：
#yum -y installnet-snmp-libs libnet PyXML
#rpm -ivh heartbeat-pils-2.1.4-12.el6.x86_64.rpm
#rpm -ivhheartbeat-stonith-2.1.4-12.el6.x86_64.rpm
#rpm -ivhheartbeat-2.1.4-12.el6.x86_64.rpm
安装好heartbeat之后配置以下三个文件：
一.配置主配置文件