LVS理论基础请点击下面的网址：

http://my.oschina.net/u/1454868/blog/208269

网络结构：

direct server:10.10.54.85(3306-master)
10.10.54.85(eth0)
192.168.1.83(eth1)vip1:10.10.54.89(eth0)
vip2:192.168.1.84(eth1)real server:192.168.1.86(80,3306-slave)
geteway:192.168.1.84real server:192.168.1.88(80,3306-slave)
gateway:192.168.1.84

需要搭建mysql主从，根据上面的网络结构搭建：

搭建主从mysql
(1)规划主从主机
主机：10.10.54.85
从机1：10.10.54.86
从机2：10.10.54.88
(2)更改主机配置文件
[root@nan85 etc]# vim /etc/my.cnf
log-bin=master-bin
binlog_format=mixed
server-id=1
(3)更改从机配置文件
从1
[root@nan86 ~]# vim /etc/my.cnf
log-bin=slave-bin
binlog_format=mixed
server-id=10
从2
[root@nan88 ~]# vim /etc/my.cnf
log-bin=slave-bin
binlog_format=mixed
server-id=11
(4)在master上创建复制用户，并授予权限
mysql> grant replication slave on *.* to 'emp1'@'10.10.54.86' identified by 'emp1';
mysql> flush privileges;
mysql> grant replication slave on *.* to 'emp2'@'10.10.54.88' identified by 'emp2';
mysql> flush privileges;
(5)查看master上二进制日志和position位置
mysql> show master status;
+-------------------+----------+--------------+------------------+
| File              | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+-------------------+----------+--------------+------------------+
| master-bin.000006 |      990 |              |                  |
+-------------------+----------+--------------+------------------+
(6)备份master上的数据，把备份master数据库还原到从库上
(7)在slave上面change master操作
从1：
mysql> change master to master_host='10.10.54.85',master_user='emp1', master_password='emp1', master_log_file='master-bin.000006',master_log_pos=990;
从2：
mysql> change master to master_host='10.10.54.85',master_user='emp2',master_password='emp2',master_log_file='master-bin.000006',master_log_pos=990;(8)在slave上启动slave
从1：
mysql> slave start;
从2：
mysql> slave start;(9)查看slave状态确定slave上的I/O线程和SQL线程状态为YES
从1：
mysql> show slave status\G;Slave_IO_Running: YesSlave_SQL_Running: Yes从2：
mysql> show slave status\G;Slave_IO_Running: YesSlave_SQL_Running: Yes

LVS(MASTER---NAT)：

1.网络架构
direct server:10.10.54.85(3306-master)
10.10.54.85(eth0)
192.168.1.83(eth1)vip1:10.10.54.89(eth0)
vip2:192.168.1.84(eth1)real server:192.168.1.86(80,3306-slave)
geteway:192.168.1.84real server:192.168.1.88(80,3306-slave)
gateway:192.168.1.842.开启内核转发
[root@nan85 ~]# vim /etc/sysctl.conf
net.ipv4.ip_forward = 13.先在master(10.10.54.85)上安装ipvsadm,keepalived
(1)下载软件
//本机内核版本：
# uname -r
2.6.32-358.el6.x86_64
下载地址： --相应版本
http://www.linuxvirtualserver.org/software/ipvs.html#kernel-2.6
ipvsadm-1.26.tar.gz
keepalived
http://www.keepalived.org/download.html
keepalived-1.2.9.tar.gz(2)编译安装ipvsadm
//配置yum源
根据自己的ftp yum源做
[root@nan85 lvs]# vim /etc/yum.repos.d/CentOS-ftp.repo
[Packages]
name=Packages
baseurl=ftp://10.201.1.221/Packages
gpgcheck=0
enable=1
[Packages2]
name=Packages2
baseurl=ftp://10.201.1.221/Packages2
gpgcheck=0
enable=1
#yum clean all
//安装依赖包
[root@nan85 ipvsadm-1.26]# yum list|grep kernel-dev
[root@nan85 ipvsadm-1.26]# yum list|grep popt
[root@nan85 lvs]# yum install popt-static.x86_64 popt-devel.x86_64 popt.x86_64
[root@nan85 lvs]# yum -y install wget libnl* popt* gcc.x86_64 gcc-c++.x86_64 gcc-objc++.x86_64 kernel-devel.x86_64 make popt-static.x86_64
//确认模块
[root@nan85 lvs]# modprobe -l|grep ipvs
kernel/net/netfilter/ipvs/ip_vs.ko
kernel/net/netfilter/ipvs/ip_vs_rr.ko
kernel/net/netfilter/ipvs/ip_vs_wrr.ko
kernel/net/netfilter/ipvs/ip_vs_lc.ko
kernel/net/netfilter/ipvs/ip_vs_wlc.ko
kernel/net/netfilter/ipvs/ip_vs_lblc.ko
kernel/net/netfilter/ipvs/ip_vs_lblcr.ko
kernel/net/netfilter/ipvs/ip_vs_dh.ko
kernel/net/netfilter/ipvs/ip_vs_sh.ko
kernel/net/netfilter/ipvs/ip_vs_sed.ko
kernel/net/netfilter/ipvs/ip_vs_nq.ko
kernel/net/netfilter/ipvs/ip_vs_ftp.ko
//编译keepalived-1.2.9
[root@nan85 lvs]# tar xvf keepalived-1.2.9.tar.gz
需要安装基础软件包openssl和popt
yum install net-snmp.x86_64 net-snmp-devel.x86_64
./configure --prefix=/usr/local/keepalived --enable-snmp --sysconfdir=/etc/
出现错误：
configure: error: unable to find net-snmp-config
解决方法：
[root@nan85 keepalived-1.2.9]# yum install net-snmp.x86_64 net-snmp-devel.x86_64
Keepalived version       : 1.2.9
Compiler                 : gcc
Compiler flags           : -g -O2
Extra Lib                : -Wl,-z,relro -Wl,-z,now -L/usr/lib64 -lnetsnmpagent -lnetsnmphelpers -lnetsnmpmibs -lnetsnmp -Wl,-E -Wl,-rpath,/usr/lib64/perl5/CORE -lssl -lcrypto -lcrypt  -lnl
Use IPVS Framework       : Yes
IPVS sync daemon support : Yes
IPVS use libnl           : Yes
Use VRRP Framework       : Yes
Use VRRP VMAC            : Yes
SNMP support             : Yes
SHA1 support             : No
Use Debug flags          : No
[root@nan85 keepalived-1.2.9]# make && make install
[root@nan85 ~]# cp /usr/local/keepalived/sbin/keepalived /sbin/
[root@nan85 ~]# cp /usr/local/keepalived/bin/genhash /bin/
[root@nan85 ~]# cd /etc/keepalived/
[root@nan85 keepalived]# ls
keepalived.conf  samples        --keepalived软件不对keepalived语法进行检查，在编辑前需要备份4.在MASTER上修改keepalived
[root@nan85 ~]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {notification_email {lisn@shiwei.com}notification_email_from lisn@shiwei.comsmtp_server mail.shiwei.comsmtp_connect_timeout 30router_id LVS_DEVEL
}vrrp_instance VI_1 {state MASTERinterface eth0virtual_router_id 51priority 100advert_int 1authentication {auth_type PASSauth_pass 1111}virtual_ipaddress {10.10.54.89/24 dev eth0 label eth0:1}virtual_ipaddress {192.168.1.84/24 dev eth1 label eth1:1}
}virtual_server 10.10.54.89 80 {delay_loop 6lb_algo rrlb_kind NATnat_mask 255.255.255.0#persistence_timeout 50protocol TCPreal_server 192.168.1.86 80 {weight 1TCP_CHECK {connect_timeout 3nb_get_retry 3delay_before_retry 3connect_port 80}}real_server 192.168.1.88 80 {weight 1TCP_CHECK {connect_timeout 3nb_get_retry 3delay_before_retry 3connect_port 80}}
}virtual_server 10.10.54.89 3306 {delay_loop 6lb_algo rrlb_kind NATnat_mask 255.255.255.0#persistence_timeout 50protocol TCPreal_server 192.168.1.86 3306 {weight 1TCP_CHECK {connect_timeout 3nb_get_retry 3delay_before_retry 3connect_port 3306}}real_server 192.168.1.88 3306 {weight 1TCP_CHECK {connect_timeout 3nb_get_retry 3delay_before_retry 3connect_port 3306}}
}
[root@nan85 keepalived]# /etc/init.d/keepalived restart
#ifconfig
查看出现
eth0:1
eth1:1
则成功
也可用下面的命令查看：
#ip addr
5.测试
//非direct server上
telnet 10.10.54.89 3306
telnet 10.10.54.89 80master 节点上：
#ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags-> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  10.10.54.89:3306 rr-> 192.168.1.86:3306            Masq    1      1          0         -> 192.168.1.87:3306            Masq    1      0          1