keepalived安装笔记(非原创)

q36988

　　1、先安装kernel和openssl组件。注意安装kernel后要创建软连接
　　#kernel-devel
yum install kernel-devel
#openssl-devel
yum install openssl-devel
#create slink from kernels
ln -sv /usr/src/kernels/2.6.18-194.el5-i686/ /usr/src/linux
　　2、在每台服务器上安装keepalived-1.2.1
　　#keepalived-1.2.1.tar.gz
wget http://www.keepalived.org/software/keepalived-1.2.1.tar.gz
tar –zxvf keepalived-1.2.1.tar.gz
cd keepalived-1.2.1
./configure
　　#check configure. You must see that:
　　# Use IPVS Framework :      Yes
　　# PVS sync daemon support : Yes
　　# Use VRRP Framework :      Yes
　　make
make install
cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/keepalived
cp /usr/local/sbin/keepalived /usr/sbin/keepalived
cp /usr/local/etc/rc.d/init.d/keepalived /etc/init.d/keepalived
　　#keepalived.conf
mkdir /etc/keepalived
#keepalived.conf default configure
cp /usr/local/etc/keepalived/samples/keepalived.conf.virtualhost /etc/keepalived/keepalived.conf
　　3、编辑/etc/keepalived/keepalived.conf
注意一下配置
virtual_ipaddress ，虚拟IP列表
virtual_server，虚拟主机
real_server，真实主机
lb_algo，负载均衡算法
　　state，主机状态，MASTER是主，BACKUP是从
　　#vim /etc/keepalived/keepalived.conf
　　global_defs {
   notification_email {
     xxx@yyy.cn
   }
   notification_email_from{
     xxx@yyy.cn
   }
   smtp_server 127.0.0.1
   #smtp_connect_timeout 30
   router_id LVS_DEVEL
}
　　vrrp_instance VI_1 {
   state MASTER           #121 set MASTER, 122 & 123 set BACKUP.
   interface eth0
   virtual_router_id 51
   priority 100
   advert_int 1
   authentication {
       auth_type mongo
       auth_pass 1111
   }
   virtual_ipaddress {              
       172.17.0.124
   }
}
　　virtual_server 172.17.0.124 30000 {
    delay_loop 6
    lb_algo wrr                     #wrr or wlc
    lb_kind DR
    persistence_timeout 60
    protocol TCP
    #virtualhost www.firewall.loc    # The VirtualHost string to use
                                     # in the GET query.
    real_server 172.17.0.121 30000 {
        weight 5
        TCP_CHECK {
            connect_timeout 10
            nb_get_retry 3
            delay_before_retry 3
            connect_port 30000
        }
    }
    real_server 172.17.0.122 30000 {
        weight 4
        TCP_CHECK {
            connect_timeout 10
            nb_get_retry 3
            delay_before_retry 3
            connect_port 30000
        }
    }
    real_server 172.17.0.123 30000 {
        weight 4
        TCP_CHECK {
            connect_timeout 10
            nb_get_retry 3
            delay_before_retry 3
            connect_port 30000
        }
    }
}
　　4、启动keepalived服务：/sbin/service keepalived start
　　可以查看日志 tail /var/log/message
　　5、狗日的ipvsadm运行不稳定，时常挂，我就不写了