这两个 heartbeat,lvs 软件在 google里面随便一搜，都有大把的实例出来供你参考，我在做的时候也没少搜。
能使用的范围非常的广，做的应用也是五花八门。
目的：实现一个heartbeart + LVS + ldirector +MySQL Slave 结构的只读数据库。
一、下载：
到上面两个网址里面去找吧 。
二、安装：
看看我的内核和OS:
[root@XXlvs01 resource.d]# cat /etc/redhat-release
CentOS release 5.2 (Final)
[root@XXlvs01 resource.d]# uname -a
Linux XXlvs01 2.6.18-92.el5 #1 SMP Tue Jun 10 18:51:06 EDT 2008 x86_64 x86_64 x86_64 GNU/Linux
[root@XXlvs01 resource.d]#
网络要求：
LVS服务器服务器和MySQL客户端服务器要在一个网段内，并且默认的网关要一样。
具体安装：
三、需要的软件包。
软件包是看机器情况的，我在安装的时候，依据安装过程中提示的依赖关系，
需要以下安装文件。
-rw-r--r-- 1 root root 6803652 Mar 19 14:49 heartbeat-2.1.4-2.1.x86_64.rpm
-rw-r--r-- 1 root root 167285 Mar 19 14:49 heartbeat-devel-2.1.4-2.1.x86_64.rpm
-rw-r--r-- 1 root root 108131 Mar 19 15:30 heartbeat-ldirectord-2.1.4-2.1.x86_64.rpm
-rw-r--r-- 1 root root 192674 Mar 19 14:49 heartbeat-pils-2.1.4-2.1.x86_64.rpm
-rw-r--r-- 1 root root 1244812 Mar 19 14:49 heartbeat-stonith-2.1.4-2.1.x86_64.rpm
-rw-r--r-- 1 root root 31699 Mar 11 12:48 ipvsadm-1.24-6.x86_64.rpm
-rw-r--r-- 1 root root 240114 Mar 19 14:24 libnet-1.1.2.1-2.1.x86_64.rpm
-rw-r--r-- 1 root root 38257 Mar 19 14:02 libtool-ltdl-1.5.22-6.1.x86_64.rpm
-rw-r--r-- 1 root root 843950 Mar 19 13:40 openssl097a-0.9.7a-9.el5_2.1.x86_64.rpm
-rw-r--r-- 1 root root 53033 Mar 19 15:46 perl-Compress-Zlib-1.42-1.fc6.x86_64.rpm
-rw-r--r-- 1 root root 93770 Mar 19 15:51 perl-HTML-Parser-3.55-1.fc6.x86_64.rpm
-rw-r--r-- 1 root root 14955 Mar 19 15:54 perl-HTML-Tagset-3.10-2.1.1.noarch.rpm
-rw-r--r-- 1 root root 385100 Mar 19 15:38 perl-libwww-perl-5.805-1.1.1.noarch.rpm
-rw-r--r-- 1 root root 91386 Mar 11 12:53 perl-MailTools-1.77-1.el4.centos.noarch.rpm
-rw-r--r-- 1 root root 201453 Mar 11 12:53 perl-Net-SSLeay-1.30-4.el4.centos.x86_64.rpm
-rw-r--r-- 1 root root 33364 Mar 11 12:53 perl-TimeDate-1.16-5.el4.noarch.rpm
四、安装步骤
以上 rpm -ivh *.rpm
[root@XXlvs02 lvs]# rpm -ivh *.rpm
warning: heartbeat-2.1.4-2.1.x86_64.rpm: Header V3 DSA signature: NOKEY, key ID 1d362aeb
warning: ipvsadm-1.24-6.x86_64.rpm: Header V3 DSA signature: NOKEY, key ID 443e1821
Preparing... ########################################### [100%]
1:heartbeat-pils ########################################### [ 6%]
2:heartbeat-stonith ########################################### [ 13%]
3:perl-Compress-Zlib ########################################### [ 19%]
4:openssl097a ########################################### [ 25%]
5:perl-Net-SSLeay ########################################### [ 31%]
6:ipvsadm ########################################### [ 38%]
7:libtool-ltdl ########################################### [ 44%]
8:perl-TimeDate ########################################### [ 50%]
9:heartbeat ########################################### [ 56%]
10:perl-MailTools ########################################### [ 63%]
11:perl-HTML-Tagset ########################################### [ 69%]
12:perl-HTML-Parser ########################################### [ 75%]
13:perl-libwww-perl ########################################### [ 81%]
14:heartbeat-devel ########################################### [ 88%]
15:heartbeat-ldirectord ########################################### [ 94%]
16:libnet ########################################### [100%]
[root@XXlvs02 lvs]#
－－－－－－－－－－－－－－以下配置以 XXmdl17,18,19,20 （207,208,209,210）为例－－－－－－－－－－－－－－－－
五、heartbeat_lvs 服务器配置文件清单...
1,/etc/ha.d/ha.cf 文件的配置；
lvs02.............
[root@XXlvs02 ~]# cat /etc/ha.d/ha.cf
debugfile /var/log/ha-debug
logfile /var/log/ha-log
logfacility local0
keepalive 1000ms
deadtime 30
warntime 5
initdead 120
udpport 694
#ucast eth5 172.16.3.2
ucast bond0 100.XXX.3.87
auto_failback off
watchdog /dev/watchdog
node XXlvs01
node XXlvs02
ping 100.XXX.3.254
respawn hacluster /usr/lib64/heartbeat/ipfail
apiauth ipfail gid=haclient uid=hacluster
[root@XXlvs02 ~]#
lvs01.............
==========================================
[root@XXlvs01 ~]# cat /etc/ha.d/ha.cf
debugfile /var/log/ha-debug
logfile /var/log/ha-log
logfacility local0
keepalive 1000ms
deadtime 30
warntime 5
initdead 120
udpport 694
#ucast eth5 172.16.3.2
ucast bond0 100.XXX.3.88
auto_failback off
watchdog /dev/watchdog
node XXlvs01
node XXlvs02
ping 100.XXX.3.254
respawn hacluster /usr/lib64/heartbeat/ipfail
apiauth ipfail gid=haclient uid=hacluster
[root@XXlvs01 ~]#
2,/etc/ha.d/
安装完毕后的目录清单。
注意 有 ldirectord -> /usr/sbin/ldirectord 文件。
[root@XXlvs01 ~]# ll /etc/ha.d/
total 44
-rw------- 1 root root 748 Mar 19 18:30 authkeys
-rw-r--r-- 1 root root 362 Mar 19 17:41 ha.cf
-rwxr-xr-x 1 root root 745 Aug 20 2008 harc
-rw-r--r-- 1 root root 6529 Mar 19 18:17 haresources
-rw-r--r-- 1 root root 396 Mar 23 20:06 ldirectord.cf
drwxr-xr-x 2 root root 4096 Mar 19 14:52 rc.d
-rw-r--r-- 1 root root 692 Aug 20 2008 README.config
drwxr-xr-x 2 root root 4096 Mar 24 16:04 resource.d
-rw-r--r-- 1 root root 7843 Aug 20 2008 shellfuncs
[root@XXlvs01 ~]# ll /etc/ha.d/resource.d/
total 104
-rwxr-xr-x 1 root root 828 Aug 20 2008 apache
-rwxr-xr-x 1 root root 805 Aug 20 2008 AudibleAlarm
-rwxr-xr-x 1 root root 760 Aug 20 2008 db2
-rwxr-xr-x 1 root root 910 Aug 20 2008 Delay
-rwxr-xr-x 1 root root 1903 Aug 20 2008 Filesystem
-rwxr-xr-x 1 root root 2325 Aug 20 2008 hto-mapfuncs
-rwxr-xr-x 1 root root 951 Aug 20 2008 ICP
-rwxr-xr-x 1 root root 3424 Aug 20 2008 ids
-rwxr-xr-x 1 root root 2273 Aug 20 2008 IPaddr
-rwxr-xr-x 1 root root 1825 Aug 20 2008 IPaddr2
-rwxr-xr-x 1 root root 1391 Aug 20 2008 IPsrcaddr
-rwxr-xr-x 1 root root 622 Aug 20 2008 IPv6addr
lrwxrwxrwx 1 root root 20 Mar 19 15:56 ldirectord -> /usr/sbin/ldirectord
-rwxr-xr-x 1 root root 1091 Aug 20 2008 LinuxSCSI
-rwxr-xr-x 1 root root 790 Aug 20 2008 LVM
-rwxr-xr-x 1 root root 4137 Aug 20 2008 LVSSyncDaemonSwap
-rwxr-xr-x 1 root root 1125 Aug 20 2008 MailTo
-rwxr-xr-x 1 root root 2923 Aug 20 2008 OCF
-rwxr-xr-x 1 root root 739 Aug 20 2008 portblock
-rwxr-xr-x 1 root root 1160 Aug 20 2008 Raid1
-rwxr-xr-x 1 root root 1070 Mar 23 18:51 realserver
-rwxr-xr-x 1 root root 1563 Aug 20 2008 SendArp
-rwxr-xr-x 1 root root 1012 Aug 20 2008 ServeRAID
-rwxr-xr-x 1 root root 1294 Aug 20 2008 WAS
-rwxr-xr-x 1 root root 1166 Aug 20 2008 WinPopup
-rwxr-xr-x 1 root root 666 Aug 20 2008 Xinetd
3,/etc/ha.d/ldirectord.cf
[root@XXlvs01 ~]# cat /etc/ha.d/ldirectord.cf
#Global Directives
checktimeout=5
checkinterval=10
#fallback=127.0.0.1:80
autoreload=yes
logfile="/var/log/ldirectord.log"
#emailalert=""
#emailalertfreq=3600
#emailalertstatus=all
quiescent=no
virtual=100.XXX.3.81:3306
real=100.XXX.3.208:3306 gate
real=100.XXX.3.209:3306 gate
real=100.XXX.3.210:3306 gate
service=mysql
scheduler=rr
protocol=tcp
checkport=3306
checktype=connect
#End of File ..
请注意上面 virtual 文件下面的行前面要且只能要一个tab 空格。
4,/etc/ha.d/haresources
XXlvs01============================
[root@XXlvs01 ha.d]# cat /etc/ha.d/haresources |grep -Ev "^$|#"
XXlvs01 IPaddr::100.XXX.3.81/24/bond0 realserver ldirectord::ldirectord.cf
[root@XXlvs01 ha.d]#
XXlvs02============================
[root@XXlvs02 ~]# cat /etc/ha.d/haresources |grep -Ev "^$|#"
XXlvs01 IPaddr::100.XXX.3.81/24/bond0 realserver ldirectord::ldirectord.cf
5,/etc/ha.d/resource.d/realserver
此文件是在 heartbeat 启动或者切换过来的时候执行 start，用来
将设定的内容写入到 ipvsadmin 的列表中。
在 切换过去的时候 由heartbeat 自动执行 stop 。
[root@XXlvs02 ~]# ll /etc/ha.d/resource.d/realserver
-rwxr-xr-x 1 root root 1070 Mar 23 18:52 /etc/ha.d/resource.d/realserver
[root@XXlvs02 ~]#
[root@XXlvs02 ~]# cat /etc/ha.d/resource.d/realserver
#!/bin/sh
#Description start lvs,disable arp response
VIP=100.XXX.3.81
RIP1=100.XXX.3.208
RIP2=100.XXX.3.209
RIP3=100.XXX.3.210
GW=100.XXX.3.254
case "$1" in
start)
echo "lvs start"
# set the Virtual IP Address
echo "1" >/proc/sys/net/ipv4/ip_forward
#Clear IPVS table
/sbin/ipvsadm -C
#set LVS
/sbin/ipvsadm -A -t $VIP:3306 -s rr
/sbin/ipvsadm -a -t $VIP:3306 -r $RIP1:3306 -g
/sbin/ipvsadm -a -t $VIP:3306 -r $RIP2:3306 -g
/sbin/ipvsadm -a -t $VIP:3306 -r $RIP3:3306 -g
#Run LVS
/sbin/ipvsadm
/bin/touch /var/lock/subsys/lvs
# set Arp
# /sbin/arping -I eth0 -c 5 -s $VIP $GW >/dev/null 2>&1
;;
stop)
/sbin/ipvsadm -C
/sbin/ipvsadm -Z
/bin/rm -rf /var/lock/subsys/lvs
# /sbin/arping -I eth0 -c 5 -s $VIP $GW
echo "ipvsadm STOPPED"
;;
status)
if [ ! -e /var/lock/subsys/lvs ];then
echo "ipvsadm is STOPPED"
exit 1
else
/sbin/ipvsadm -ln
echo "..........ipvsadm is OK"
fi
;;
*)
echo "Usage: $0{start|stop|status}"
exit 1
esac
exit 0
[root@XXlvs02 ~]#
六、客户端需要设置的内容。
[root@XXmdl19 bin]# more ipvs_client_for_mysql.sh
ifconfig dummy0 up
ifconfig dummy0 100.XXX.3.81 netmask 255.255.255.0 broadcast 100.XXX.3.81 up
echo 1 > /proc/sys/net/ipv4/ip_forward
echo "1" >/proc/sys/net/ipv4/conf/dummy0/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/dummy0/arp_announce
echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
sysctl -p
[root@XXmdl19 bin]# ifconfig
dummy0 Link encap:Ethernet HWaddr F6:82:C7:63:30:96
inet addr:100.XXX.3.81 Bcast:100.XXX.3.81 Mask:255.255.255.0
UP BROADCAST RUNNING NOARP MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
七、验证步骤
1，确认heartbeat 主从
[root@XXlvs01 ha.d]# ifconfig |grep inet
inet addr:100.XXX.3.87 Bcast:100.XXX.3.255 Mask:255.255.255.0
inet addr:100.XXX.3.81 Bcast:100.XXX.3.255 Mask:255.255.255.0
inet addr:100.XXX.8.87 Bcast:100.XXX.8.255 Mask:255.255.255.0
inet addr:127.0.0.1 Mask:255.0.0.0
可以确认到 100.XXX.3.81 VIP已经存在。
从别的服务器也能ping通。
2，确认 LVS中设定的列表：
[root@XXlvs01 ha.d]# ipvsadm -L
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 100.XXX.3.81:mysql rr
-> XXmdl20:mysql Route 1 0 0
-> XXmdl18:mysql Route 1 0 0
[root@XXlvs01 ha.d]#
3，在MySQL客户端确认ldirector 定期来确认MySQL的连接情况：
[root@XXmdl19 var]# tcpdump host 100.XXX.3.87
tcpdump: WARNING: eth0: no IPv4 address assigned
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
11:37:39.427884 IP XXmdl19.mysql > XXlvs01.34356: S 3961650748:3961650748(0) ack 2091235633 win 5792
11:37:39.428437 IP XXmdl19.mysql > XXlvs01.34356: P 1:106(105) ack 2 win 46
11:37:39.428468 IP XXmdl19.mysql > XXlvs01.34356: F 106:106(0) ack 2 win 46
11:37:49.428994 IP XXmdl19.mysql > XXlvs01.34359: S 3986364821:3986364821(0) ack 2105720293 win 5792
11:37:49.429205 IP XXmdl19.mysql > XXlvs01.34359: P 1:106(105) ack 2 win 46
11:37:49.429236 IP XXmdl19.mysql > XXlvs01.34359: F 106:106(0) ack 2 win 46
11:37:59.430272 IP XXmdl19.mysql > XXlvs01.34362: S 3987864478:3987864478(0) ack 2110335516 win 5792
11:37:59.430462 IP XXmdl19.mysql > XXlvs01.34362: P 1:106(105) ack 2 win 46
11:37:59.430489 IP XXmdl19.mysql > XXlvs01.34362: F 106:106(0) ack 2 win 46
11:38:09.432210 IP XXmdl19.mysql > XXlvs01.34365: S 4007363487:4007363487(0) ack 2123944523 win 5792
11:38:09.432427 IP XXmdl19.mysql > XXlvs01.34365: P 1:106(105) ack 2 win 46
11:38:09.432456 IP XXmdl19.mysql > XXlvs01.34365: F 106:106(0) ack 2 win 46
12 packets captured
24 packets received by filter
0 packets dropped by kernel
可以确认是10秒中一次访问。
4，在访问端确认是否可以访问MYSQL，并且是不同的MySQL。
[root@XXfapp07 ~]# mysql -uXXfxs -pXXfxs -h100.XXX.3.81 -e "show variables like \"%pid%\"" ;
+---------------+----------------------------------+
| Variable_name | Value |
+---------------+----------------------------------+
| pid_file | /usr/local/mysql/var/XXmdl19.pid |
+---------------+----------------------------------+
[root@XXfapp07 ~]# mysql -uXXfxs -pXXfxs -h100.XXX.3.81 -e "show variables like \"%pid%\"" ;
+---------------+----------------------------------+
| Variable_name | Value |
+---------------+----------------------------------+
| pid_file | /usr/local/mysql/var/XXmdl20.pid |
+---------------+----------------------------------+
[root@XXfapp07 ~]# mysql -uXXfxs -pXXfxs -h100.XXX.3.81 -e "show variables like \"%pid%\"" ;
+---------------+----------------------------------+
| Variable_name | Value |
+---------------+----------------------------------+
| pid_file | /usr/local/mysql/var/XXmdl18.pid |
+---------------+----------------------------------+
[root@XXfapp07 ~]#
5，reboot LVS的 Master
[root@XXlvs01 ha.d]# reboot
Broadcast message from root (pts/0) (Wed Mar 25 11:42:19 2009):
The system is going down for reboot NOW!
[root@XXlvs01 ha.d]#
在 36秒后 从LVS 进行接管：
heartbeat[6849]: 2009/03/25_11:42:55 WARN: node XXlvs01: is dead
heartbeat[6849]: 2009/03/25_11:42:55 WARN: No STONITH device configured.
ipfail[6956]: 2009/03/25_11:42:55 info: Status update: Node XXlvs01 now has status dead
heartbeat[6849]: 2009/03/25_11:42:55 WARN: Shared disks are not protected.
heartbeat[6849]: 2009/03/25_11:42:55 info: Resources being acquired from XXlvs01.
heartbeat[6849]: 2009/03/25_11:42:55 info: Link XXlvs01:bond0 dead.
heartbeat[2341]: 2009/03/25_11:42:55 debug: notify_world: setting SIGCHLD Handler to SIG_DFL
harc[2341]: 2009/03/25_11:42:55 info: Running /etc/ha.d/rc.d/status status
heartbeat[2342]: 2009/03/25_11:42:55 info: No local resources [/usr/share/heartbeat/ResourceManager listkeys XXlvs02] to acquire.
heartbeat[6849]: 2009/03/25_11:42:55 debug: StartNextRemoteRscReq(): child count 1
ipfail[6956]: 2009/03/25_11:42:55 debug: Found ping node 100.XXX.3.254!
mach_down[2370]: 2009/03/25_11:42:55 info: Taking over resource group IPaddr::100.XXX.3.81/24/bond0
ResourceManager[2396]: 2009/03/25_11:42:55 info: Acquiring resource group: XXlvs01 IPaddr::100.XXX.3.81/24/bond0 realserver ldirectord::ldirectord.cf
IPaddr[2423]: 2009/03/25_11:42:55 INFO: Resource is stopped
ResourceManager[2396]: 2009/03/25_11:42:55 info: Running /etc/ha.d/resource.d/IPaddr 100.XXX.3.81/24/bond0 start
ResourceManager[2396]: 2009/03/25_11:42:55 debug: Starting /etc/ha.d/resource.d/IPaddr 100.XXX.3.81/24/bond0 start
IPaddr[2522]: 2009/03/25_11:42:55 INFO: Using calculated netmask for 100.XXX.3.81: 255.255.255.0
IPaddr[2522]: 2009/03/25_11:42:55 DEBUG: Using calculated broadcast for 100.XXX.3.81: 100.XXX.3.255
IPaddr[2522]: 2009/03/25_11:42:55 INFO: eval ifconfig bond0:0 100.XXX.3.81 netmask 255.255.255.0 broadcast 100.XXX.3.255
IPaddr[2522]: 2009/03/25_11:42:55 DEBUG: Sending Gratuitous Arp for 100.XXX.3.81 on bond0:0 [bond0]
IPaddr[2493]: 2009/03/25_11:42:55 INFO: Success
INFO: Success
ResourceManager[2396]: 2009/03/25_11:42:55 debug: /etc/ha.d/resource.d/IPaddr 100.XXX.3.81/24/bond0 start done. RC=0
ResourceManager[2396]: 2009/03/25_11:42:55 info: Running /etc/ha.d/resource.d/realserver start
ResourceManager[2396]: 2009/03/25_11:42:55 debug: Starting /etc/ha.d/resource.d/realserver start
lvs start
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 100.XXX.3.81:mysql rr
-> XXmdl20:mysql Route 1 0 0
-> XXmdl19:mysql Route 1 0 0
-> XXmdl18:mysql Route 1 0 0
ResourceManager[2396]: 2009/03/25_11:42:55 debug: /etc/ha.d/resource.d/realserver start done. RC=0
ipfail[6956]: 2009/03/25_11:42:55 info: NS: We are still alive!
ipfail[6956]: 2009/03/25_11:42:55 info: Link Status update: Link XXlvs01/bond0 now has status dead
ResourceManager[2396]: 2009/03/25_11:42:56 info: Running /etc/ha.d/resource.d/ldirectord ldirectord.cf start
ResourceManager[2396]: 2009/03/25_11:42:56 debug: Starting /etc/ha.d/resource.d/ldirectord ldirectord.cf start
ipfail[6956]: 2009/03/25_11:42:56 debug: Found ping node 100.XXX.3.254!
ResourceManager[2396]: 2009/03/25_11:42:56 debug: /etc/ha.d/resource.d/ldirectord ldirectord.cf start done. RC=0
mach_down[2370]: 2009/03/25_11:42:56 info: /usr/share/heartbeat/mach_down: nice_failback: foreign resources acquired
mach_down[2370]: 2009/03/25_11:42:56 info: mach_down takeover complete for node XXlvs01.
heartbeat[6849]: 2009/03/25_11:42:56 info: mach_down takeover complete.
ipfail[6956]: 2009/03/25_11:42:56 info: Asking other side for ping node count.
ipfail[6956]: 2009/03/25_11:42:56 debug: Message [num_ping] sent.
ipfail[6956]: 2009/03/25_11:42:56 info: Checking remote count of ping nodes.
在客户端进行确认：
[root@XXfapp07 ~]# mysql -uXXfxs -pXXfxs -h100.XXX.3.81 -e "show variables like \"%pid%\"" ;
+---------------+----------------------------------+
| Variable_name | Value |
+---------------+----------------------------------+
| pid_file | /usr/local/mysql/var/XXmdl19.pid |
+---------------+----------------------------------+
[root@XXfapp07 ~]# mysql -uXXfxs -pXXfxs -h100.XXX.3.81 -e "show variables like \"%pid%\"" ;
+---------------+----------------------------------+
| Variable_name | Value |
+---------------+----------------------------------+
| pid_file | /usr/local/mysql/var/XXmdl18.pid |
+---------------+----------------------------------+
[root@XXfapp07 ~]# mysql -uXXfxs -pXXfxs -h100.XXX.3.81 -e "show variables like \"%pid%\"" ;
+---------------+----------------------------------+
| Variable_name | Value |
+---------------+----------------------------------+
| pid_file | /usr/local/mysql/var/XXmdl20.pid |
+---------------+----------------------------------+
[root@XXfapp07 ~]#
在切换期间无法访问，切换完毕后 又可以进行访问，并且轮询分配。
6，停止一台MySQL。
初始：
[root@XXlvs02 ~]# ipvsadm -L
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RXXoteAddress:Port Forward Weight ActiveConn InActConn
TCP 100.XXX.3.81:mysql rr
-> XXmdl20:mysql Route 1 0 0
-> XXmdl19:mysql Route 1 0 0
-> XXmdl18:mysql Route 1 0 0
[root@XXlvs02 ~]#
停止MySQL XXmdl19
[root@XXlvs02 ~]# ipvsadm -L
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RXXoteAddress:Port Forward Weight ActiveConn InActConn
TCP 100.XXX.3.81:mysql rr
-> XXmdl20:mysql Route 1 0 0
-> XXmdl18:mysql Route 1 0 0
[root@XXlvs02 ~]#
在 10秒内自动将 XXmdl19的 MySQL转发在 LVS中删除，只有两个了。
再访问MySQL时，能正常访问MySQL 20 和 18。
八、特殊对应的注意事项：
追加一台MySQL的步骤：
1），在新追加的 MySQL上 执行 ipvs_client_for_mysql.sh ，
确认默认网关是否和 LVS 服务器一致。
netstat -nr
2），修改realserver和 ldirector.cf 文件，将新机器IP追加进去。
※注意，追加生效是在你修改过 /etc/ha.d/ldirectord.cf 文件后
就立刻生效了。。。。。这点比较狠，也比较好。。。。
所以追加之前，一定要启动好 XXmdl17上的 MySQL，并执行好ipvs_client_for_mysql.sh。
否则，追加之后应用不能访问，应用就会立刻报错。
ipvsadmin 常见的命令用法：
查看：ipvsadm -L
[root@XXlvs01 ~]# ipvsadm -L
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RXXoteAddress:Port Forward Weight ActiveConn InActConn
TCP 100.XXX.3.81:mysql rr
-> XXmdl17:mysql Route 1 0 0
-> XXmdl20:mysql Route 1 0 5
-> XXmdl18:mysql Route 1 0 5
[root@XXlvs01 ~]#
追加： /sbin/ipvsadm -a -t 100.XXX.3.81:3306 -r 100.XXX.3.207:3306 -g
删除： /sbin/ipvsadm -d -t 100.XXX.3.81:3306 -r 100.XXX.3.207:3306
※注意，手动删除后，ldirectord 对这条不会再按照"活的就加进来、死的就去掉的"的原则了。
也挺好。 给你手动控制提供的一个方法。可以脱离 ldirector 的控制了。
但是 最好不要老去手动删除，那样你就利用不到 ld 的自动的优点了。
