LVS+Keepalived 实现高性能高可用负载均衡服务器
LVS是Linux Virtual Server的简写，意即Linux虚拟服务器，是一个虚拟的服务器集群系统。本项目在1998年5月由章文嵩博士成立，是中国国内最早出现的自由软件项目之一。目前有三种IP负载均衡技术（VS/NAT、VS/TUN和VS/DR）；十种调度算法（rrr|wrr|lc|wlc|lblc|lblcr|dh|sh|sed|nq）。
Keepalvied
Keepalived在这里主要用作RealServer的健康状态检查以及LoadBalance主机和BackUP主机之间failover的实现
[*] LVS-DR-Master 61.164.122.6
[*] LVS-DR-BACKUP 61.164.122.7
[*] LVS-DR-VIP 61.164.122.8
[*] WEB1-Realserver 61.164.122.9
[*] WEB2-Realserver 61.164.122.10
[*] GateWay 61.164.122.1
安装LVS和Keepalvied软件包
下载相关软件包
[*] #mkdir /usr/local/src/lvs
[*] #cd /usr/local/src/lvs
[*] #wget http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.24.tar.gz
[*] #wgethttp://www.keepalived.org/software/keepalived-1.1.15.tar.gz
安装LVS和Keepalived
[*] #lsmod |grep ip_vs
[*] #uname -r
[*] 2.6.18-53.el5PAE
[*] #ln -s /usr/src/kernels/2.6.18-53.el5PAE-i686//usr/src/linux
[*]
[*] #tar zxvf ipvsadm-1.24.tar.gz
[*] #cd ipvsadm-1.24
[*] #make && make install
[*] #find / -name ipvsadm# 查看ipvsadm的位置
[*]
[*] #tar zxvf keepalived-1.1.15.tar.gz
[*] #cd keepalived-1.1.15
[*] #./configure&& make && make install
[*] #find / -name keepalived# 查看keepalived位置
[*]
[*] #cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
[*] #cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
[*] #mkdir /etc/keepalived
[*] #cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
[*] #cp /usr/local/sbin/keepalived /usr/sbin/
[*] #service keepalived start|stop #做成系统启动服务方便管理.
配置LVS实现负载均衡
vi /etc/sysctl.conf
[*] net.ipv4.conf.lo.arp_ignore = 1
[*] net.ipv4.conf.lo.arp_announce = 2
[*] net.ipv4.conf.all.arp_ignore = 1
[*] net.ipv4.conf.all.arp_announce = 2
[*] sysctl -p
ip addr add 61.164.122.8/32 dev lo
利用Keepalvied实现负载均衡和和高可用性
1.配置在主负载均衡服务器上配置keepalived.conf
#vi /etc/keepalived/keepalived.conf
[*] ! Configuration File for keepalived
[*]
[*] global_defs {
[*] notification_email {
[*] yakexi007@vip.qq.com
[*] }
[*] notification_email_from sns-lvs@gmail.com
[*] smtp_server 127.0.0.1
[*] # smtp_connect_timeout 30
[*] router_id LVS_DEVEL
[*] }
[*]
[*] # 20081013 written by :netseek
[*] # VIP1
[*] vrrp_instance VI_1 {
[*] state MASTER #备份服务器上将MASTER改为BACKUP
[*] interface eth0
[*] virtual_router_id 51
[*] priority 100 # 备份服务上将100改为99
[*] advert_int 1
[*] authentication {
[*] auth_type PASS
[*] auth_pass 1111
[*] }
[*] virtual_ipaddress {
[*] 61.164.122.8
[*] #(如果有多个VIP，继续换行填写.)
[*] }
[*] }
[*]
[*] virtual_server 61.164.122.8 80 {
[*] delay_loop 6 #(每隔10秒查询realserver状态)
[*] lb_algo wrr #(lvs 算法)
[*] lb_kind DR #(Direct Route)
[*] persistence_timeout 60 #(同一IP的连接60秒内被分配到同一台realserver)
[*] protocol TCP #(用TCP协议检查realserver状态)
[*]
[*] real_server 61.164.122.9 80 {
[*] weight 3 #(权重)
[*] TCP_CHECK {
[*] connect_timeout 10 #(10秒无响应超时)
[*] nb_get_retry 3
[*] delay_before_retry 3
[*] connect_port 80
[*] }
[*] }
[*] real_server 61.164.122.10 80 {
[*] weight 3
[*] TCP_CHECK {
[*] connect_timeout 10
[*] nb_get_retry 3
[*] delay_before_retry 3
[*] connect_port 80
[*] }
[*] }
[*] }
#/etc/init.d/keepalived start启动keepalived 服务，keepalived就能利用keepalived.conf 配置文件，实现负载均衡和高可用.
整个LVS负均衡HA方案，由keepalived.conf一个文件即可搞定！
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