Keepalived 安装与配置

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keepalived是由C语言编写的路由软件，是lvs的扩展项目，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。

1、获取安装软件

下载地址： http://www.keepalived.org/download.html

2、安装前提

确保ipvs已经被安装
#如下，执行ipvsadm检查ipvs是否已经安装(当前大多数Linux缺省已安装)
[root@HKBO ~]# ipvsadm
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn

#检查当前加载的内核模块，看是否存在ip_vs模块
[root@HKBO ~]# lsmod|grep ip_vs
ip_vs 122113 0

如果没有安装，直接使用yum install ipvsadm

3、安装keepalived

tar -xvf keepalived-1.2.13.tar.gz
cd keepalived-1.2.13
./configure --disable-fwmark --prefix=/usr/local/keepalived

make && make install

安装完后执行如下步骤

mkdir /etc/keepalived/
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
ln -s /usr/local/keepalived/sbin/keepalived /sbin/
service keepalived restart

4、修改配置文件后重新启动

! Configuration File for keepalived

global_defs {
notification_email {
evanzheng@sohu-inc.com
}
notification_email_from localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id Master
}

vrrp_instance VI_1 {
state BACKUP
interface eth1
virtual_router_id 86
priority 99
advert_int 1
authentication {
auth_type PASS
auth_pass 3252
}
virtual_ipaddress {
虚拟ip
}
}

}

5、配置文件解释：

! Configuration File for keepalived#全局定义块，包含邮件定义部分，global_defs {   notification_email {     acassen@firewall.loc     failover@firewall.loc     sysadmin@firewall.loc   }   notification_email_from Alexandre.Cassen@firewall.loc   smtp_server 192.168.200.1   smtp_connect_timeout 30   router_id LVS_DEVEL  //负载均衡器标识，在一个网络内，它应该是唯一的}#VRRP实例定义块，负责负载均衡器之间的失败切换vrrp_instance VI_1 {    state MASTER                       //只有MASTER和BACKUP 2种状态，主为MASTER，从为BACKUP，使用大写                                            interface eth0                     //监控的网络接口                                                   virtual_router_id 51               //同一实例下virtual_router_id必须相同                               priority 100                       //定义优先级，数字越大，优先级越高                                advert_int 1                       //MASTER与BACKUP负载均衡器之间同步检查的时间间隔，单位是秒          authentication {                   //验证类型和密码                                                        auth_type PASS        auth_pass 1111    }    virtual_ipaddress {                //虚拟ip地址virtual_ipaddress,可以定义多个        192.168.200.16        192.168.200.17        192.168.200.18    }}#虚拟服务器定义块virtual_server 192.168.200.100 443 {                               //定义虚拟服务器                                               delay_loop 6                                                   //delay_loop，健康检查时间间隔，单位是秒                                        lb_algo rr                                                     //负载调度算法，这里设置为rr，即轮询算法，互联网应用常使用wlc或rr                           lb_kind NAT                                                    //负载均衡转发规则。一般包括DR,NAT,TUN3种，在我的方案中，都使用DR的方式       nat_mask 255.255.255.0                                         //子网掩码          persistence_timeout 50                                         //会话保持时间，单位是秒（可以适当延长时间以保持session）                                    protocol TCP                                                   //转发协议类型，有tcp和udp两种                                                                                         real_server 192.168.201.100 443 {                              //真实服务器IP及端口                                                    weight 1                                                   //默认为1,0为失效                                  SSL_GET {                                                                               url {                                                                                 path /                                                                              digest ff20ad2481f97b1754ef3e12ecd3a9cc                                           }            url {              path /mrtg/              digest 9b3a0c85a887a256d6939da88aabd8cd            }            connect_timeout 3            nb_get_retry 3            delay_before_retry 3        }    }}virtual_server 10.10.10.2 1358 {    delay_loop 6    lb_algo rr     lb_kind NAT    persistence_timeout 50    protocol TCP    sorry_server 192.168.200.200 1358    real_server 192.168.200.2 1358 {        weight 1        HTTP_GET {            url {               path /testurl/test.jsp              digest 640205b7b0fc66c1ea91c463fac6334d            }            url {               path /testurl2/test.jsp              digest 640205b7b0fc66c1ea91c463fac6334d            }            url {               path /testurl3/test.jsp              digest 640205b7b0fc66c1ea91c463fac6334d            }            connect_timeout 3            nb_get_retry 3            delay_before_retry 3        }    }    real_server 192.168.200.3 1358 {        weight 1        HTTP_GET {            url {               path /testurl/test.jsp              digest 640205b7b0fc66c1ea91c463fac6334c            }            url {               path /testurl2/test.jsp              digest 640205b7b0fc66c1ea91c463fac6334c            }            connect_timeout 3            nb_get_retry 3            delay_before_retry 3        }    }}

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