LVS+keepalived+nginx+tomcat部署实现(转载)
# 拓扑如下所示2台前端 keepalived+lvs，热备的方式，保证一台lvs前端能正常访问就行，如果一台down，另外一台热备升级到master主机
master: 192.168.1.210 ubuntu 12.0.4
salve: 192.168.1.211 ubuntu 12.0.4
后端2台web服务器通过lvs的算法轮询被访问
web1: 192.168.1.204 centos 5.10 nginx+tomcat
web2: 192.168.1.206 centos 5.10 nginx+tomcat
vip: 192.168.1.207
1：首先 web1和web2都不用装ipvsadm和keepalived，只要启用一个脚本即可，
当然你已经把nginx+tomcat已经配置完，并能正常访问页面
vim realserver.sh
#!/bin/bash
#
# Script to start LVS DR real server.
# description: LVS DR real server
#
./etc/rc.d/init.d/functions
VIP=192.168.1.207 #这里根据需要改成自己的VIP地址
host=`/bin/hostname`
case "$1" in
start)
# Start LVS-DR real server on this machine.
/sbin/ifconfig lo down
/sbin/ifconfig lo up
echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore
echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce
echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
/sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up
/sbin/route add -host $VIP dev lo:0
;;
stop)
# Stop LVS-DR real server loopback device(s).
/sbin/ifconfig lo:0 down
echo 0 > /proc/sys/net/ipv4/conf/lo/arp_ignore
echo 0 > /proc/sys/net/ipv4/conf/lo/arp_announce
echo 0 > /proc/sys/net/ipv4/conf/all/arp_ignore
echo 0 > /proc/sys/net/ipv4/conf/all/arp_announce
;;
status)
# Status of LVS-DR real server.
islothere=`/sbin/ifconfig lo:0 | grep $VIP`
isrothere=`netstat -rn | grep "lo:0" | grep $VIP`
if [ ! "$islothere" -o ! "isrothere" ];then
# Either the route or the lo:0 device
# not found.
echo "LVS-DR real server Stopped."
else
echo "LVS-DR real server Running."
fi
;;
*)
# Invalid entry.
echo "$0: Usage: $0 {start|status|stop}"
exit 1
;;
esac
chmod +x realserver.sh
./realserver.sh start
可通过ifconfig和route -n来查询刚才脚本实现的功能
如果可以把此脚本放在启动时运行
ifconfig
route -n
2：然后再master和salve分别安装ipvsadm和keepalived
yum install -y keepalived ipvsadm (centos redhat)
或者
apt-get install keepalived ipvsadm (debian ubuntu)
安装完ipvsadm和keepalived，不用配置lvs，直接用keepalived来启用lvs就行
在master主机设置：
vim /etc/keepalived/keepalived.conf
global_defs
{
router_id master_210
}
vrrp_instance shengzc {
state MASTER
interface eth0
virtual_router_id 100 #这个数值 master和slave必须统一
priority 151 #这个数值决定哪台服务器是master
advert_int 1
authentication {
auth_type PASS
auth_pass 123456
}
virtual_ipaddress {
192.168.1.207
}
}
virtual_server 192.168.1.207 80 {
delay_loop 6
lb_algo wrr
lb_kind DR
# persistence_timeout 50
protocol TCP
real_server 192.168.1.204 80 {
weight 1
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 192.168.1.206 80 {
weight 1
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
启动keepalived
/etc/init.d/keepalived start
在slave主机设置：
vim /etc/keepalived/keepalived.conf
global_defs
{
router_id slave_211
}
vrrp_instance shengzc {
state MASTER
interface eth0
virtual_router_id 100 #这个数值 master和slave必须统一
priority 150 #这个数值决定哪台服务器是master 这里我们比master数值低，所以角色是backup，
advert_int 1
authentication {
auth_type PASS
auth_pass 123456
}
virtual_ipaddress {
192.168.1.207
}
}
virtual_server 192.168.1.207 80 {
delay_loop 6
lb_algo wrr
lb_kind DR
# persistence_timeout 50
protocol TCP
real_server 192.168.1.204 80 {
weight 1
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 192.168.1.206 80 {
weight 1
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
启动keepalived
/etc/init.d/keepalived start
可以运行 ipvsadm -ln 来查看是否启用
ipvsadm
好了，现在我们直接访问 http://192.168.1.207 就实现了，高可用性，高负载的集群
参考文章：
http://www.5ilinux.com/2014/05/lvs_keepalived_nginx_tomcat.html
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