lvs(dr)+keepalived

系统：centos6.5mini

环境：

机器名	Ip地址	角色	Vip-web： 192.168.20.50 Vip-mysql: 192.168.20.60
lvs01	192.168.20.100	Lvs
lvs02	192.168.20.200	Lvs
Web01	192.168.20.10	Web
Web02	192.168.20.20	Web
Mysql01	192.168.20.30	Mysql
Mysql02	192.168.20.40	Mysql

注: 这个实验做的是web和mysql 负载均衡

1.各个机器关掉iptables,selinux,如下命令

[root@lvs01 ~]# service iptables stop

[root@lvs01 ~]# chkconfig iptables off

[root@lvs01 ~]# getenforce

Disabled

2.web01和web02 上安装web服务，将VIP绑定到真实服务器的网口eth0，修改sysctl.conf

[root@web01 ~]# yum install -y  httpd

[root@web01 ~]# /etc/init.d/httpd restart

[root@web01 ~]# chkconfig httpd on

[root@web01 ~]# cat /var/www/html/index.html

web01

[root@web01 ~]# ip addr add 192.168.20.50/24 dev eth0

[root@web01 ~]# vi  /etc/rc.d/rc.local

ip addr add 192.168.20.50/24 dev eth0

[root@web01 ~]# vi /etc/sysctl.conf

net.ipv4.conf.eth0.arp_ignore = 1

net.ipv4.conf.eth0.arp_announce = 2

net.ipv4.conf.all.arp_ignore = 1

net.ipv4.conf.all.arp_announce = 2

[root@web01 ~]# sysctl -p

[root@web02 ~]# yum install -y  httpd

[root@web02 ~]# /etc/init.d/httpd restart

[root@web02 ~]# chkconfig httpd on

[root@web02 ~]# cat /var/www/html/index.html

web2

[root@web02 ~]# ip addr add 192.168.20.50/24 dev eth0

[root@web02 ~]# vi  /etc/rc.d/rc.local

ip addr add 192.168.20.50/24 dev eth0

[root@web01 ~]# vi /etc/sysctl.conf

net.ipv4.conf.eth0.arp_ignore = 1

net.ipv4.conf.eth0.arp_announce = 2

net.ipv4.conf.all.arp_ignore = 1

net.ipv4.conf.all.arp_announce = 2

[root@web01 ~]# sysctl -p

3.在mysql01和mysql02上安装mysql 服务，在mysql01上创建mysql01，并且赋予用户myusr01从任何服务器登录的权限，而在mysql02上创建mysql02，并且赋予用户myusr01从任何服务器登录的权限。将VIP绑定到真实服务器的网口eth0，修改sysctl.conf。

[root@mysql01 ~]# yum install -y mysql mysql-server

[root@mysql01 mysql]# /etc/init.d/mysqld start

[root@mysql01 mysql]# chkconfig mysqld on

[root@mysql01 ~]# mysql -uroot -p

Enter password:

mysql> create database mysql01;

mysql> grant all privileges on *.* to 'myusr01'@'%' identified by '00000000' with grant option;

mysql> flush privileges;

mysql> quit;

[root@mysql01 ~]# ip addr add 192.168.20.60/24 dev eth0

[root@mysql01 ~]# vi  /etc/rc.d/rc.local

ip addr add 192.168.20.60/24 dev eth0

[root@mysql01 ~]# vi /etc/sysctl.conf

net.ipv4.conf.eth0.arp_ignore = 1

net.ipv4.conf.eth0.arp_announce = 2

net.ipv4.conf.all.arp_ignore = 1

net.ipv4.conf.all.arp_announce = 2

[root@mysql01 ~]# sysctl -p

[root@mysql02 ~]# yum install -y mysql mysql-server

[root@mysql02 mysql]# /etc/init.d/mysqld start

[root@mysql02 mysql]# chkconfig mysqld on

[root@mysql02 ~]# mysql -uroot -p

Enter password:

mysql> create database mysql02;

mysql> grant all privileges on *.* to 'myusr01'@'%' identified by '00000000' with grant option;

mysql> flush privileges;

mysql> quit;

[root@mysql01 ~]# ip addr add 192.168.20.60/24 dev eth0

[root@mysql01 ~]# vi  /etc/rc.d/rc.local

ip addr add 192.168.20.60/24 dev eth0

[root@mysql01 ~]# vi /etc/sysctl.conf

net.ipv4.conf.eth0.arp_ignore = 1

net.ipv4.conf.eth0.arp_announce = 2

net.ipv4.conf.all.arp_ignore = 1

net.ipv4.conf.all.arp_announce = 2

[root@mysql01 ~]# sysctl -p

4. 在lvs01和lvs02 上安装lvs+keepalived

[root@lvs01 ~]#yum install ipvsadm  keepalived –y

[root@lvs02 ~]#yum install ipvsadm  keepalived –y

5.Keepalived的配置

[root@lvs01 ~]# vi /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {

router_id lvs01

}

vrrp_instance VI_1 {

state MASTER

interface eth0

virtual_router_id

priority

advert_int 1

authentication {

auth_type PASS

auth_pass

}

virtual_ipaddress {

192.168.20.50

}

}

vrrp_instance VI_2 {

state BACKUP

interface eth0

virtual_router_id

priority

advert_int 1

authentication {

auth_type PASS

auth_pass

}

virtual_ipaddress {

192.168.20.60

}

}

virtual_server 192.168.20.50 80{

delay_loop 6  #健康检查时间间隔，单位s

lb_algo rr     #负载均衡调度算法设置为加权轮叫

lb_kind DR    # LVS工作机制，这里是DR模式

nat_mask 255.255.255.0 #网络掩码，DR模式要保障真是服务器和lvs在同一网段

persistence_timeout 0  #会话保持时间，单位s，测试时数值尽量小一点，轮询结果明显。

protocol TCP  #协议

real_server 192.168.20.10 80{  #设定真实服务器地址以及端口，

weight 1  # 设置权重，数字越低，调度的比例越小。

}

real_server 192.168.20.20 80{

weight 1

}

}

virtual_server 192.168.20.60 3306{

delay_loop 6

lb_algo rr

lb_kind DR

nat_mask 255.255.255.0

persistence_timeout 0

protocol TCP

real_server 192.168.20.30 3306{

weight 1

}

real_server 192.168.20.40 3306{

weight 1

}

}

[root@lvs01 ~]# /etc/init.d/keepalived restart

[root@lvs02 ~]# vi /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {

router_id lvs02

}

vrrp_instance VI_1 {

state BACKUP

interface eth0

virtual_router_id

priority

advert_int 1

authentication {

auth_type PASS

auth_pass

}

virtual_ipaddress {

192.168.20.50

}

}

vrrp_instance VI_2 {

state MASTER

interface eth0

virtual_router_id

priority

advert_int 1

authentication {

auth_type PASS

auth_pass

}

virtual_ipaddress {

192.168.20.60

}

}

virtual_server 192.168.20.50 80{

delay_loop 6

lb_algo rr

lb_kind DR

nat_mask 255.255.255.0

persistence_timeout 0

protocol TCP

real_server 192.168.20.10 80{

weight 1

}

real_server 192.168.20.20 80{

weight 1

}

}

virtual_server 192.168.20.60 3306{

delay_loop 6

lb_algo rr

lb_kind DR

nat_mask 255.255.255.0

persistence_timeout 0

protocol TCP

real_server 192.168.20.30 3306{

weight 1

}

real_server 192.168.20.40 3306{

weight 1

}

}

[root@lvs02 ~]# /etc/init.d/keepalived restart

（注意：lvs+keepalived这是一种双主模式，注意route_id的不同，优先级，主备之分）

6．查看vip

[root@lvs01 ~]# ip addr list

[root@lvs02 ~]# ip addr list

7.验证web集群

7.1正常测试,可以看到的是通过vip 访问，可以以轮询的方式将客户的请求发送到web服务器上

7.2 当lvs01 down机了，可以看到vip 漂移到lvs02上，依然可以正常访问web服务

[root@lvs02 ~]# ip addr list

8.验证mysql集群

8.1 正常测试,可以看到的是通过vip 访问，可以以轮询的方式将客户的请求发送到mysql服务器上

[root@lvs01 ~]# mysql -h 192.168.20.60 -umyusr01 -p00000000 -e 'show databases'

[root@lvs01 ~]# mysql -h 192.168.20.60 -umyusr01 -p00000000 -e 'show databases'

8.2 当lvs02 down机了，vip 会飘到lvs01 上，mysql 服务依然可以正常服务

[root@lvs01 ~]# ip addr list

[root@lvs01 ~]# mysql -h 192.168.20.60 -umyusr01 -p00000000 -e 'show databases'

9.查看lvs