KeepAlived安装与配置

KeepAlived安装与配置

 

一：目标 

两台服务器，一主一备。提供两个虚拟IP。

Server A: 10.10.0.141 (主服务器)

Server B: 10.10.0.151 (备服务器)

Virtual IP: 10.10.0.41/51 

要求正常情况，主服务器提供服务，主服务器失效时，备服务器接管。 

 

二：安装keepalived

    编译和安装

#  ./configure --prefix=/usr/local/keepalived-1.2.9
# make
# make install

    

    安装keepalived的启动服务

cp /usr/local/keepalived-1.2.9/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
cp /usr/local/keepalived-1.2.9/etc/sysconfig/keepalived /etc/sysconfig/
mkdir /etc/keepalived
cp /usr/local/keepalived-1.2.9/etc/keepalived/keepalived.conf /etc/keepalived/
ln -s /usr/local/keepalived-1.2.9/sbin/keepalived /usr/sbin/
service keepalived start

设置随机器启动：
chkconfig keepalived on

 

三：配置keepalived（Master / Slave模式）

master配置

! Configuration File for keepalived

global_defs {
   notification_email {
     [e-mail]
   }
   notification_email_from [e-mail]
   smtp_server smtp.163.com
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.1.41
    }
}

#其实这里是个增强。
vrrp_instance VI_2 {
    state BACKUP
    interface eth0
    virtual_router_id 52
    priority 90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.1.51
    }
}

 

salve配置

! Configuration File for keepalived

global_defs {
   notification_email {
     [e-mail]
   }
   notification_email_from [e-mail]
   smtp_server smtp.163.com
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}

vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 51
    priority 90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.1.51
    }
}

vrrp_instance VI_2 {
    state MASTER
    interface eth0
    virtual_router_id 52
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.1.51
    }
}

 

附属conf的备注：

global_defs {

   notification_email {
     [e-mail]   #设置报警邮件地址，可以设置多个，每行一个。需要开启sendmail服务。
   }
   notification_email_from keepalived@localhost  #设置邮件的发送地址
   smtp_server 127.0.0.1                         #设置SMTP Server地址
   smtp_connect_timeout 30                       #设置SMTP Server的超时时间
   router_id LVS_DEVEL          #表示运行Keepalived服务器的一个标识。发邮件时显示大邮件主题中的信息
}
vrrp_instance VI_1 {            #vrrp 实例定义部分
    state MASTER                #指定Keepalived的角色，MASTER表示些主机是主服务器。BACKUP表示此主机是备用服务器 
    interface eth1              #指定HA监测网络的接口
    virtual_router_id 51        #虚拟路由标识，这个标识是一个数字，同一个vrrp实例使用唯一的标识，即同一个vrrp_instance下MASTER与BACKUP必须是一致的
    priority 50                 #定义优先级，数字越大，优先级越高
    authentication {
        auth_type PASS          #设置验证类型和密码，MASTER和BACKUP必须使用相同的密码才能正常通信
        auth_pass 1111
    }
    virtual_ipaddress {        #设置虚拟IP地址，可以设置多个虚拟IP地址，每行一个
       192.168.100.250
    }
}
virtual_server 192.168.100.250 80 {   #设置虚拟服务器，需要指定虚拟IP地址和服务端口，IP与端口之间用空格隔开
    delay_loop 6                 #设置运行情况检查时间，单位为秒
    lb_algo rr                #设置负载调度算法，这里设置rr，即轮询算法
    lib_kind DR               #设置LVS实现负载均衡机制，有NAT、TUN、DR三个模式可选
    persistence_timeout 60    #会话保持单位时间，单位是秒
    protocol TCP              #指定转发协议类型，有TCP和UDP两种
    real_server 192.168.100.60 80 {  #配置服务节点1，需要指定real server的真实IP地址和端口
        weight 1                     #配置服务节点的权值，权值数字越大，权值越高
        TCP_CHECK {                  #relserve的状态检测设置部分，单位是秒
                  connect_timeout 10 #表示10秒无响应超时
                  nb_get_retry 3     #表示重试次数
           dealy_before_retry 3  #表示重试间隔
 }
    }
    real_server 192.168.100.80 80 {
        weight 1
        TCP_CHECK {
                 connect_timeout 10  #表示10秒无响应超时
                 nb_get_retry 3     #表示重试次数
          dealy_before_retry 3  #表示重试间隔
 }
    }
}