keepalived高可用集群的简单配置
keepalived高可用集群keepalived是一个类似于layer3, 4 & 5交换机制的软件，也就是我们平时说的第3层、第4层和第5层交换。Keepalived的作用是检测web服务器的状态，如果有一台web服务器死机，或工作出现故障，Keepalived将检测到，并将有故障的web服务器从系统中剔除，当web服务器工作正常后Keepalived自动将web服务器加入到服务器群中，这些工作全部自动完成，不需要人工干涉，需要人工做的只是修复故障的web服务器。
准备工作；
准备四台虚拟机、RS1、RS2、HA1、HA2
修改IP地址：RS1：172.16.26.10 RS2：172.16.26.11
HA1：172.16.26.7 HA2：172.16.26.8
VIP：172.16.26.1
首先配置realserver1
复制一个脚本到starts.sh
vim starts.sh
编辑以下内容
#!/bin/bash
#
# Script to start LVS DR real server.
# description: LVS DR real server
#
./etc/rc.d/init.d/functions
VIP=192.168.0.219
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 修改它的执行权限；chmod +x startrs.sh
执行这个脚本./startrs.sh start
http://blog.运维网.com/attachment/201305/001238426.png
在RS2上使用上面同样的命令
可以直接复制这个脚本
scp startrs.sh 172.16.26.11:/root/
http://blog.运维网.com/attachment/201305/001358270.png
然后配置主从节点
准备：1、时间同步
2、SSH双机互信
3、主机名和uname -n 一致，并通过/etc/hosts解析
不再演示
配置好后，下载并安装keepalived包
yum -y --nogpgcheck localinstall keepalived-1.2.7-5.el5.i386.rpm
修改配置文件
vim /etc/keepalived/keepalived.conf
global_defs {
notification_email {
root@localhost
}
notification_email_from root@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 99
priority 101
advert_int 1
authentication {
auth_type PASS
auth_pass password
}
virtual_ipaddress {
172.16.26.1
}
}
virtual_server 172.16.26.1 80 {
delay_loop 6
lb_algo wlc
lb_kind DR
nat_mask 255.255.0.0
protocol TCP
real_server 172.16.26.10 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 2
nb_get_retry 3
delay_before_retry 1
}
}
real_server 172.16.26.11 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 2
nb_get_retry 3
delay_before_retry 1
}
}
} 将这个配置文件复制到节点2上一份
scp keepalived.conf node2:/etc/keepalived/
只需修改两个内容
states MASTER 改为 states BACKUP
priority 101改为 priority 100
在两个节点上启动keepalived
service keepalived start
安装ipvs规则
yum -y install ipvsadm
http://blog.运维网.com/attachment/201305/003714632.png
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