| 负载均衡模式:NAT | |||
| LVS-MASTER | LVS-BACKUP | WEB1 | WEB2 |
| ipvsadm | |
| Keepalived | 主要实现VRRP功能，用作RealServer的web服务器健康状态以及LoadBalance（负载均衡）主机和BackUP主机之间failover（系统自动主从切换）的实现。 |
| 三种LVS模式 | DR：直接路由 、Tuning：tcp/ip隧道和NAT：网络地址转换 |
| Web公共存储 | 可以使用NFS网络文件系统来代替，两台Web同时挂载NFS，过程略... |
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[root@localhost ~]
# yum install -y gcc gcc-c++ make pcre pcre-devel kernel-devel openssl-devel libnl-devel popt-devel
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wget http:
//www
.linuxvirtualserver.org
/software/kernel-2
.6
/ipvsadm-1
.26.
tar
.gz
tar
-zxvf ipvsadm-1.26.
tar
.gz
cd
ipvsadm-1.26
make
&&
make
install
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wget http:
//www
.keepalived.org
/software/keepalived-1
.2.7.
tar
.gz
tar
zxvf keepalived-1.2.7.
tar
.gz
cd
keepalived-1.2.7
.
/configure
--prefix=
/usr/local/keepalived
make
&&
make
install
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cp
/usr/local/keepalived/etc/rc
.d
/init
.d
/keepalived
/etc/init
.d/
cp
/usr/local/keepalived/etc/sysconfig/keepalived
/etc/sysconfig/
mkdir
/etc/keepalived/
cp
/usr/local/keepalived/etc/keepalived/keepalived
.conf
/etc/keepalived/
cp
/usr/local/keepalived/sbin/keepalived
/usr/sbin/
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[root@localhost ~]
# vi /etc/keepalived/keepalived.conf
! Configuration File
for
keepalived
global_defs {
notification_email {
test
@sina.com
#故障接受联系人
}
notification_email_from admin@
test
.com
#故障发送人
smtp_server 127.0.0.1
#本机发送邮件
smtp_connect_timeout 30
router_id LVS_MASTER
#BACKUP上修改为LVS_BACKUP
}
vrrp_instance VI_1 {
state MASTER
#BACKUP上修改为BACKUP
interface eth0
virtual_router_id 51
#虚拟路由标识，主从相同
priority 100
#BACKUP上修改为90
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
#主从认证密码必须一致
}
virtual_ipaddress {
#虚拟IP（VTP）
192.168.108.180
}
}
vrrp_instance LAN_GATEWAY {
#定义内网网关
state MASTER
#BACKUP上修改为BACKUP
interface eth1
virtual_router_id 50
#虚拟路由ID，主从相同
priority 100
#BACKUP上修改为90
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
#内网网关虚拟IP
192.168.0.50
}
}
virtual_server 192.168.0.50 80 {
#定义内网网关虚拟IP和端口
delay_loop 6
#检查真实服务器时间，单位秒
lb_algo rr
#设置负载调度算法，rr为轮训
lb_kind NAT
#设置LVS负载均衡NAT模式
persistence_timeout 50
#同一IP的连接60秒内被分配到同一台真实服务器
protocol TCP
#使用TCP协议检查realserver状态
real_server 192.168.0.10 80 {
#第一个网关节点
weight 3
#节点权重值
TCP_CHECK {
#健康检查方式
connect_timeout 3
#连接超时
nb_get_retry 3
#重试次数
delay_before_retry 3
#重试间隔/S
}
}
real_server 192.168.0.20 80 {
#第二个网关节点
weight 3
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}
virtual_server 192.168.108.180 80 {
#定义外部虚拟IP
delay_loop 6
lb_algo rr
lb_kind NAT
persistence_timeout 50
protocol TCP
real_server 192.168.0.30 80 {
#第一个web服务器
weight 3
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 192.168.0.40 80 {
#第二个web服务器
weight 3
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
[root@localhost ~]
# service keepalived restart #启动keepalived
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[root@localhost ~]
# service httpd start
[root@localhost ~]
# echo “192.168.0.30″ > /var/www/html/index.html
[root@localhost ~]
# echo “192.168.0.40″ > /var/www/html/index.html
[root@localhost ~]
# service iptables stop #关闭防火墙
[root@localhost ~]
# setenforce 0 #临时关闭selinux
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