haproxy+keepalived构建高可用负载均衡

web1 IP 192.168.0.47

web2 IP 192.168.0.48

haproxy_master 192.168.0.200

haproxy_backup 192.168.0.199

VIP 192.168.0.155



一.安装keepalived

#wget http://www.keepalived.org/software/keepalived-1.1.15.tar.gz
#tar zxvf keepalived-1.1.15.tar.gz
#cd keepalived-1.1.15
#./configure
#make
#make install 将keepalived做成启动脚务

#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/

配置keepalived.conf

#vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {
notification_email {
gaoming@123.com
}
notification_email_from gaoming@123.com
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}

vrrp_instance VI_1 {
state MASTER    #备用服务器上改为 BACKUP
interface eth0
virtual_router_id 51
priority 100    #备用服务器上改为99
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.0.155/24 dev eth0 scope global
}
}

启动keepalived

service keepalived start

启动之后可以用ip add 查看网卡多了一条192.168.0.155的IP

eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000

link/ether 00:0c:29:ff:6c:c7 brd ff:ff:ff:ff:ff:ff

inet 192.168.0.200/24 brd 192.168.0.255 scope global eth0

inet 192.168.0.155/24 scope global secondary eth0

inet6 fe80::20c:29ff:feff:6cc7/64 scope link

valid_lft forever preferred_lft forever

说明keepalived启动成功，配置生效

二.安装haproxy

#wget http://haproxy.1wt.eu/download/1.3/src/haproxy-1.3.20.tar.gz
#uname -a

Linux ip1 2.6.18-194.el5 #1 SMP Fri Apr 2 14:58:35 EDT 2010 i686 i686 i386 GNU/Linux

#make TARGET=linux26 prefix=/usr/local/haproxy install

#cd /usr/local/haproxy

配置haproxy

#vim haproxy.conf

global
maxconn  5120
chroot   /usr/local/haproxy
uid      100
gid      100
daemon
quiet
nbproc   2
pidfile  /usr/local/haproxy/haproxy.pid
########################################################

defaults
log     global
log     127.0.0.1  local3
mode    http
option  httplog
option  dontlognull
option  redispatch
retries 3

maxconn 3000
contimeout 5000
clitimeout 50000
srvtimeout 50000
stats enable
stats uri /admin
stats auth admin:admin
stats realm Haproxy \ statistic
##########################################################

frontend www.gaoming.com
bind *:80
default_backend server_pool
backend server_pool
mode    http
balance roundrobin
option  forwardfor
option  httpclose
option  httpchk GET /index.html
server web1 192.168.0.48:80 check inter 5000 fall 1 rise 2
server web1 192.168.0.47:80 check inter 5000 fall 1 rise 2

haproxy的配置2台机器相同

启动haproxy

#/usr/local/haproxy/sbin/haproxy -f /usr/local/haproxy/haproxy.conf

域名解析到VIP上，用户访问VIP会负载到后端2台WEB上

测试高可用，关掉主haproxy，备用的会接管VIP