haproxy+keepalived建構高可用負載均衡

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.安裝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做成啟動腳務

#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 {
     [email protected]
   }
   notification_email_from [email protected]
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}

vrrp_instance VI_1 {
    state MASTER    #備用伺服器上改為 BACKUP
    interface eth0
    virtual_router_id 51
    priority 100    #備用伺服器上改為99
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.0.155/24 dev eth0 scope global
    }
}
           

啟動keepalived

service keepalived start

啟動之後可以用ip add 檢視網卡多了一條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

說明keepalived啟動成功，配置生效

二.安裝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台機器相同

啟動haproxy

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

域名解析到VIP上，使用者通路VIP會負載到後端2台WEB上

測試高可用，關掉主haproxy，備用的會接管VIP