三、Corosync 详细配置
1.提供配置文件
[root@node1 ~]# cd /etc/corosync/
[root@node1 corosync]# ll
总用量 24
-rw-r--r-- 1 root root 445 5月 15 05:09 corosync.conf.example
-rw-r--r-- 1 root root 1084 5月 15 05:09 corosync.conf.example.udpu
drwxr-xr-x 2 root root 4096 5月 15 05:09 service.d
drwxr-xr-x 2 root root 4096 5月 15 05:09 uidgid.d
注：大家可以看到提供一个样例文件corosync.conf.example
[root@node1 corosync]# cp corosync.conf.example corosync.conf
2.修改配置文件
[root@node1 corosync]# cat corosync.conf
# Please read the corosync.conf.5 manual page
compatibility: whitetank
totem {
version: 2
secauth: on #启动认证
threads: 2
interface {
ringnumber: 0
bindnetaddr: 192.168.18.0 #修改心跳线网段
mcastaddr: 226.99.10.1 #组播传播心跳信息
mcastport: 5405
ttl: 1
}
}
logging {
fileline: off
to_stderr: no
to_logfile: yes
to_syslog: no
logfile: /var/log/cluster/corosync.log #日志位置
debug: off
timestamp: on
logger_subsys {
subsys: AMF
debug: off
}
}
amf {
mode: disabled
}
#启用pacemaker
service {
ver: 0
name: pacemaker
}
aisexec {
user: root
group: root
}
注：用 man corosync.conf 可以查看所有选项的意思。
3.生成密钥文件
注：corosync生成key文件会默认调用/dev/random随机数设备，一旦系统中断的IRQS的随机数不够用，将会产生大量的等待时间，因此，为了节约时间，我们在生成key之前讲random替换成urandom，以便节约时间。
[root@node1 corosync]# mv /dev/{random,random.bak}
[root@node1 corosync]# ln -s /dev/urandom /dev/random
[root@node1 corosync]# corosync-keygen
Corosync Cluster Engine Authentication key generator.
Gathering 1024 bits for key from /dev/random.
Press keys on your keyboard to generate entropy.
Writing corosync key to /etc/corosync/authkey.
4.查看生成的key文件
[root@node1 corosync]# ll
总用量 24
-r-------- 1 root root 128 8月 13 14:16 authkey
-rw-r--r-- 1 root root 521 8月 13 11:11 corosync.conf
-rw-r--r-- 1 root root 445 5月 15 05:09 corosync.conf.example
-rw-r--r-- 1 root root 1084 5月 15 05:09 corosync.conf.example.udpu
drwxr-xr-x 2 root root 4096 5月 15 05:09 service.d
drwxr-xr-x 2 root root 4096 5月 15 05:09 uidgid.d
5.将key文件authkey与配置文件corosync.conf复制到node2上
[root@node1 corosync]# scp -p authkey corosync.conf node2:/etc/corosync/
authkey 100% 128 0.1KB/s 00:00
corosync.conf 100% 521 0.5KB/s 00:00
[root@node2 ~]# cd /etc/corosync/
[root@node2 corosync]# ll
总用量 24
-r-------- 1 root root 128 8月 13 14:16 authkey
-rw-r--r-- 1 root root 521 8月 13 11:11 corosync.conf
-rw-r--r-- 1 root root 445 5月 15 05:09 corosync.conf.example
-rw-r--r-- 1 root root 1084 5月 15 05:09 corosync.conf.example.udpu
drwxr-xr-x 2 root root 4096 5月 15 05:09 service.d
drwxr-xr-x 2 root root 4096 5月 15 05:09 uidgid.d
注：corosync 到这里配置全部完成。下面我们进行启动测试！
四、Corosync 启动信息
1.启动corosync
[root@node1 ~]# ssh node2 "service corosync start"
Starting Corosync Cluster Engine (corosync): [确定]
[root@node1 ~]# service corosync start
Starting Corosync Cluster Engine (corosync): [确定]
2.查看corosync启动信息
(1).查看corosync引擎是否正常启动
[root@node1 ~]# grep -e "Corosync Cluster Engine" -e "configuration file" /var/log/cluster/corosync.log
Aug 13 14:20:15 corosync [MAIN ] Corosync Cluster Engine ('1.4.1'): started and ready to provide service.
Aug 13 14:20:15 corosync [MAIN ] Successfully read main configuration file '/etc/corosync/corosync.conf'.
Aug 13 17:08:51 corosync [MAIN ] Corosync Cluster Engine ('1.4.1'): started and ready to provide service.
Aug 13 17:08:51 corosync [MAIN ] Successfully read main configuration file '/etc/corosync/corosync.conf'.
Aug 13 17:08:51 corosync [MAIN ] Corosync Cluster Engine exiting with status 18 at main.c:1794.
(2).查看初始化成员节点通知是否正常发出
[root@node1 ~]# grep TOTEM /var/log/cluster/corosync.log
Aug 13 14:20:15 corosync [TOTEM ] Initializing transport (UDP/IP Multicast).
Aug 13 14:20:15 corosync [TOTEM ] Initializing transmit/receive security: libtomcrypt SOBER128/SHA1HMAC (mode 0).
Aug 13 14:20:15 corosync [TOTEM ] The network interface [192.168.18.201] is now up.
Aug 13 14:20:15 corosync [TOTEM ] A processor joined or left the membership and a new membership was formed.
Aug 13 14:20:40 corosync [TOTEM ] A processor joined or left the membership and a new membership was formed.
(3).检查启动过程中是否有错误产生
[root@node1 ~]# grep ERROR: /var/log/cluster/corosync.log
Aug 13 14:20:15 corosync [pcmk ] ERROR: process_ais_conf: You have configured a cluster using the Pacemaker plugin for Corosync. The plugin is not supported in this environment and will be removed very soon.
Aug 13 14:20:15 corosync [pcmk ] ERROR: process_ais_conf: Please see Chapter 8 of 'Clusters from Scratch' () for details on using Pacemaker with CMAN
(4).查看pacemaker是否正常启动
[root@node1 ~]# grep pcmk_startup /var/log/cluster/corosync.log
Aug 13 14:20:15 corosync [pcmk ] info: pcmk_startup: CRM: Initialized
Aug 13 14:20:15 corosync [pcmk ] Logging: Initialized pcmk_startup
Aug 13 14:20:15 corosync [pcmk ] info: pcmk_startup: Maximum core file size is: 18446744073709551615
Aug 13 14:20:15 corosync [pcmk ] info: pcmk_startup: Service: 9
Aug 13 14:20:15 corosync [pcmk ] info: pcmk_startup: Local hostname: node1.test.com
3.查看集群状态
[root@node1 ~]# crm_mon
Last updated: Tue Aug 13 17:41:31 2013
Last change: Tue Aug 13 14:20:40 2013 via crmd on node1.test.com
Stack: classic openais (with plugin)
Current DC: node2.test.com - partition with quorum
Version: 1.1.8-7.el6-394e906
2 Nodes configured, 2 expected votes
0 Resources configured.
Online: [ node1.test.com node2.test.com ]
注：大家可以看到，集群运行正常，node1与node2都在线，DC是node2节点。但是还没有配置资源，配置资源就要用到pacemaker，在下一篇博客中我们重点讲解pacemaker使用。用pacemaker来增加各种资源。^_^……
