基于keepalived构建HA集群
一、keepalived简介1.Keepalived的作用是检测RealServer的健康状态，如果有一台RealServer服务器宕机，Keepalived将检测到，并将宕掉的RealServer服务器从系统中剔除，当RealServer服务器重新恢复正常工作后Keepalived自动将RealServer服务器加入到服务器群中。2.keeepalived常见模型<1>主从模型：（主节点修复后服务返回主节点）定义一个VIP（定义在网卡别名之上）在vrrp_instance做如下修改：stateMASTER#从节点为BACKUPpriority101#指定优先级，数字越大优先级越高，主节点的优先级高于从节点<2>双主模型：创建两个虚拟路由器，两个节点互为主从指定两个vrrp_instance互为主从virtual_router_id不相同<3>LVS+keepalived首先配置LVS配置keepalived，添加虚拟服务，指定lvs模型及调度算法
实战篇系统环境：centos6.4-i386yum-yinstallkeepalivedkeepalivedi686-1.2.7-3二、主从模型HA集群
修改主配置文件：vim/etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
linuxedu@gmail.com
mageedu@126.com
}
notification_email_from kanotify@magedu.com
smtp_connect_timeout 3
smtp_server 127.0.0.1#邮件发送者为本地主机
router_id LVS_DEVEL
}
vrrp_script chk_haproxy {
script "killall -0 haproxy"
interval 1
weight 2
}
vrrp_script chk_mantaince_down {
script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"
interval 1
weight -2
}
vrrp_instance VI_1 {#vrrp实例
interface eth0
state MASTER# 从节点为BACKUP
priority 101# 指定优先级，数字越大优先级越高
virtual_router_id 51
garp_master_delay 1
authentication {
auth_type PASS
auth_pass password
}
track_interface {
eth1
}
virtual_ipaddress {
172.16.15.114/16 dev eth1 label eth1:0 #指定VIP及网卡别名
}
track_script {
chk_haproxy
chk_mantaince_down
}
notify_master "/etc/keepalived/notify.sh master"
notify_backup "/etc/keepalived/notify.sh backup"
notify_fault "/etc/keepalived/notify.sh fault"
}
notify脚本：
contact='root@localhost'#!/bin/bash
vip=172.16.15.114 #指定vip
notify() {
mailsubject="`hostname` to be $1: $vip floating"
mailbody="`date '+%F %H:%M:%S'`: vrrp transition, `hostname` changed to be $1"
echo $mailbody | mail -s "$mailsubject" $contact
}
case "$1" in
master)
notify master
/etc/rc.d/init.d/haproxy start
exit 0
;;
backup)
notify backup
/etc/rc.d/init.d/haproxy stop
exit 0
;;
fault)
notify fault
exit 0
;;
*)
echo 'Usage: `basename $0` {master|backup|fault}'
exit 1
;;
esac
以windows作为客户端访问172.16.15.114关掉主服务：servicekeepalivedstop
三、双主模型原理：创建两个虚拟路由器，两个节点互为主从。
! Configuration File for keepalivedglobal_defs {notification_email {linuxedu@gmail.commageedu@126.com}notification_email_from kanotify@magedu.comsmtp_connect_timeout 3smtp_server 127.0.0.1router_id LVS_DEVEL}vrrp_script chk_haproxy {script "killall -0 haproxy"interval 1weight 2}vrrp_script chk_mantaince_down {script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"interval 1weight 2}vrrp_instance VI_1 {#实例1interface eth1state MASTER# BACKUP for slave routerspriority 101# 100 for BACKUPvirtual_router_id 51garp_master_delay 1authentication {auth_type PASSauth_pass password}track_interface {eth1}virtual_ipaddress {#VIP1172.16.15.115/16 dev eth1 label eth1:1}track_script {chk_haproxychk_mantaince_down}notify_master "/etc/keepalived/notify.sh master"notify_backup "/etc/keepalived/notify.sh backup"notify_fault "/etc/keepalived/notify.sh fault"}vrrp_instance VI_2 {#实例2interface eth1state BACKUP# BACKUP for slave routerspriority 100# 100 for BACKUPvirtual_router_id 52garp_master_delay 1authentication {auth_type PASSauth_pass password}track_interface {eth1}virtual_ipaddress {#VIP2172.16.15.116/16 dev eth1 label eth1:2}track_script {chk_haproxychk_mantaince_down}}在客户端访问172.16.15.115172.16.15.116查看IP
四、实现LVS+keepalived（LVS--DR）1、首先配置LVS负载均衡集群注：LVS在会后续博文中做详细介绍！！！
添加ipvsadm规则
#yum -y install ipvsadm #安装ipvsadm#ipvsadm #查看ipvsadm信息及规则#ipvsadm -A -t 172.16.15.117:80 -s rr#指定Director（调度器）注释：A(添加规则)-t(指定协议为TCP)172.16.15.117:80(指定VIP及端口)-srr(指定调度算法为rr)#添加real_server
#ipvsadm -a -t 172.16.15.117:80 -r 172.16.15.5 -g#ipvsadm -a -t 172.16.15.117:80 -r 172.16.15.14 -g#ifconfig lo:0 $WEB_VIP netmask 255.255.255.255 broadcast $WEB_VIP#配置VIP，只允许本地回环# /sbin/route add -host $WEB_VIP dev lo:0 #添加本地路由#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注释：在此只添加两个节点-a：添加服务-r172.16.15.5：指定服务IP-g：指定lvs模型（默认DR）2、配置基于keepalived（主从）高可用集群
! Configuration File for keepalivedglobal_defs {notification_email {linuxedu@gmail.commageedu@126.com}notification_email_from kanotify@magedu.comsmtp_connect_timeout 3smtp_server 127.0.0.1router_id LVS_DEVEL}vrrp_script chk_schedown {script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"interval 2weight -2}vrrp_instance VI_1 {interface eth1state MASTERpriority 101virtual_router_id 51garp_master_delay 1authentication {auth_type PASSauth_pass password}track_interface {eth1}virtual_ipaddress {172.16.15.117/16 #指定VIP,此处的VIP和lvs的VIP相同，因此不指定网卡}track_script {chk_schedown}}virtual_server 172.16.15.117 80 { #指定虚拟服务delay_loop 6lb_algo rrlb_kind DRpersistence_timeout 50protocol TCPsorry_server 172.16.15.14 80 #错误页面real_server 172.16.15.5 80 {#指定rserver1weight 1HTTP_GET {url {path /status_code 200 #状态码}connect_timeout 3nb_get_retry 3delay_before_retry 3}}real_server 172.16.15.14 80 {#指定rserver2weight 1HTTP_GET {url {path /status_code 200}connect_timeout 3 #连接超时时间nb_get_retry 3 #尝试连接次数delay_before_retry 3 #每次尝试之前等待的时间}}}在客户端访问172.16.15.117
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