LVS+DR+Keepalived实现方式
来源地址:
http://blog.yunvi.com/html/797.html
来源内容:
一:安装配置 LVS+DR+Keepalived
负载服务器master真实IP 192.168.1.106
负载服务器backup真实IP 192.168.1.114
负载服务器虚拟IP 192.168.1.10
后端WEB服务器IP 192.168.1.50
后端WEB服务器IP 192.168.1.60
系统:Redhat 5.4 x86 内核:2.6.18-164.el5
1.下载所需要的软件:ipvsadm keepalived
2.安装ipvsadm(负载均衡器都要配置master和backup)
A.建立内核快捷方式:
ln –s /usr/src/kernels/2.6.18-164.e15-i686 /usr/src/linux
B.解压ipvsadm,编译ipvsadm
tar zxvf ipvsadm-1.24.tar.gzcd ipvsadm-1.24make ; make install
C.显示如下:
[root@master ~]# /sbin/ipvsadm -vipvsadm v1.24 2005/12/10 (compiled with popt and IPVS v1.2.1)
则Ipvsadm安装成功
3.安装keepalived负载均衡器都要配置master和backup)
tar zxvf keepalived-1.1.18tar.gzcd keepalived-1.1.18./configure --prefix=/usr/local/keepalivedmake ; make installcp etc/rc.d/init.d/keepalived /etc/rc.d/init.d/cp etc/sysconfig/keepalived /etc/sysconfig/mkdir /etc/keepalivedcp etc/keepalived/keepalived.conf /etc/keepalived/cp sbin/keepalived /usr/sbin/
启动keepalived
service keepalived start|stop|restart
4.配置master和backup
A.开启ip_forward 转发功能:
sysctl –w net.ipv4.ip_forward = 1
B.配置keepalived.conf 配置文件
Vim /etc/keepalived/keepalived.conf! Configuration File for keepalivedglobal_defs {notification_email {crazyunix@139.com #}notification_email_from crazyunix@139.comsmtp_server smtp.139.com# smtp_connect_timeout 30router_id LVS_DEVEL}vrrp_instance VI_1 {state MASTER #备份服务器上将MASTER改为BACKUPinterface eth0 #HA监测网络接口virtual_router_id 51 #主、备机的virtual_router_id必须相同priority 90 #主、备机取不同的优先级,主机值较大,备份机值较小advert_int 1 #VRRP Multicast广播周期秒数authentication {auth_type PASS #VRRP认证方式auth_pass 1111 #VRRP口令字}virtual_ipaddress {192.168.1.10 #(如果有多个VIP,继续换行填写.)}}virtual_server 192.168.1.10 80 {delay_loop 2 #每隔2秒查询realserver状态lb_algo rr #lvs 算法lb_kind DR #Direct Routepersistence_timeout 50 #同一IP的连接60秒内被分配到同一台realserverprotocol TCP #用TCP协议检查realserver状态real_server 192.168.1.50 80 {weight 100TCP_CHECK {connect_timeout 3nb_get_retry 3delay_before_retry 3}}real_server 192.168.1.60 80 {weight 1TCP_CHECK {connect_timeout 3nb_get_retry 3delay_before_retry 3}}}
BACKUP服务器同上配置,先安装lvs再按装keepalived,仍后配置/etc/keepalived/keepalived.conf,只需将红色标示的部分改一下即可.
5.配置 VIP:
vim /etc/sysconfig/network-scripts/ifcfg-lo:0DEVICE=lo:0IPADDR=192.168.1.10NETMASK=255.255.255.255ONBOOT=yesNAME=loopback
重启网卡,启动keepalived 显示如下成功!
6.配置ipvsadm(配置master和backup)
添加负载均衡器
/sbin/ipvsadm -A -t 192.168.1.10:80 -s rr
增加realserver
/sbin/ipvsadm -a –t 192.168.1.10:80 -r 192.168.1.50:80 -g #192.168.1.50 是真实机的ip/sbin/ipvsadm -a –t 192.168.1.10:80 -r 192.168.1.60:80 -g #192.168.1.60 是真实机的iproute add -host 192.168.1.10 dev lo:0
7.配置realserver (web1和web2)
配置vip 地址
/sbin/ifconfig lo:0 192.168.1.10 netmask 255.255.255.255 broadcast 192.168.1.10 uproute add -host 192.168.1.10 dev lo:0
8.在realserver 安装测试httpd(只为显示结果)
yum install httpd –yservice httpd startvim /var/www/html/index.htmlthis is 192.168.1.50/60
9.在master负载均衡器上查看
[root@master ~]# ipvsadm -L -nIP Virtual Server version 1.2.1 (size=4096)Prot LocalAddress:Port Scheduler Flags-> RemoteAddress:Port Forward Weight ActiveConn InActConnTCP 192.168.1.10:80 rr persistent 50-> 192.168.1.60:80 Route 1 0 0-> 192.168.1.50:80 Route 100 0 0
10.访问:192.168.1.10 出现一下表示安装成功