keepalived安装与配置

来源：互联网发布：专业淘宝货源批发市场编辑：程序博客网时间：2024/05/22 15:09

一、安装keepalived 1.2.2
yum -y install gcc make openssl openssl-devel wget kernel-devel
mkdir -p /usr/local/src/hasoft
cd /usr/local/src/hasoft
wget http://www.keepalived.org/software/keepalived-1.2.2.tar.gz
tar -zxvf keepalived-1.2.2.tar.gz
cd keepalived-1.2.2
./configure --prefix=/usr/local/keepalived --with-kernel-dir=/usr/src/kernels/2.6.18-238.19.1.el5-i686/
make && make install

二、整理管理文件
cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/

三、服务设置开机启动
chkconfig keepalived on
或者
echo "/usr/local/keepalived/sbin/keepalived" >> /etc/rc.local

四、配置
1. 主-备模式
节点A 192.168.0.11 (主节点),节点B 192.168.0.12(备用节点),虚拟IP(对外提供服务的IP 192.168.0.200,192.168.0.201)

节点A上的配置文件/usr/local/keepalived/etc/keepalived/keepalived.conf:

global_defs {
   notification_email { #通知邮件列表
     root@localhost
   }
   notification_email_from root@local.host #发送通知邮件
   smtp_server localhost
   smtp_connect_timeout 30
   router_id NodeA #路由ID,唯一标识本节点
}
vrrp_instance VI_1 {
    state MASTER   #指定A节点为主节点备用节点上设置为BACKUP即可
    interface eth0   #绑定虚拟IP的网络接口
    virtual_router_id 51 #VRRP组名，两个节点的设置必须一样，以指明各个节点属于同一VRRP组
    priority 100   #主节点的优先级（1-254之间），备用节点必须比主节点优先级低
    advert_int 1   #组播信息发送间隔，两个节点设置必须一样
    authentication {   #设置验证信息，两个节点必须一致
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {   #指定虚拟IP, 两个节点设置必须一样
        192.168.0.200
        192.168.0.201
    }
}

节点B上的配置文件/usr/local/keepalived/etc/keepalived/keepalived.conf:

global_defs {
   notification_email { #通知邮件列表
     root@localhost
   }
   notification_email_from root@local.host #发送通知邮件
   smtp_server localhost
   smtp_connect_timeout 30
   router_id NodeB #路由ID,唯一标识本节点
}
vrrp_instance VI_1 {
    state BACKUP   #指定B节点为备用节点
    interface eth0   #绑定虚拟IP的网络接口
    virtual_router_id 51 #VRRP组名，两个节点的设置必须一样，以指明各个节点属于同一VRRP组
    priority 99   #备用节点的优先级（1-254之间），备用节点必须比主节点优先级低
    advert_int 1   #组播信息发送间隔，两个节点设置必须一样
    authentication {   #设置验证信息，两个节点必须一致
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {   #指定虚拟IP, 两个节点设置必须一样
        192.168.0.200
        192.168.0.201
    }
}

2. 双主模式
双主模式允许两台机器均处于工作状态并互相作为备份。
搭建keepalived双主模式的要素：
1. 必须有两个虚拟IP, 分别绑定至两个节点上
2. 每个节点作为某个虚拟IP的主节点，并同时作为另外一个虚拟IP的备用节点。
3. 当某个节点产生故障时，两个虚拟IP自动绑定至正常节点上
也就是说，两个节点的配置应该是交叉的，对同个虚拟IP，交叉互为主备。

节点A上的配置文件/usr/local/keepalived/etc/keepalived/keepalived.conf:

global_defs {
   notification_email {
     root@localhost
   }
   notification_email_from root@local.host
   smtp_server localhost
   smtp_connect_timeout 30
   router_id NodeA
}
vrrp_instance VI_1 { #定义路由id=51的主(VIP=192.168.0.200)
    state MASTER
    interface eth0
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.0.200
    }
}
vrrp_instance VI_2 { #定义路由id=52的备(VIP=192.168.0.201)
    state BACKUP
    interface eth0
    virtual_router_id 52
    priority 99
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.0.201
    }
}

节点B上的配置文件/usr/local/keepalived/etc/keepalived/keepalived.conf:

global_defs {
   notification_email {
     root@localhost
   }
   notification_email_from root@local.host
   smtp_server localhost
   smtp_connect_timeout 30
   router_id NodeB
}
vrrp_instance VI_1 { #定义路由id=52的主(VIP=192.168.0.201)
    state MASTER
    interface eth0
    virtual_router_id 52
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.0.201
    }
}
vrrp_instance VI_2 { #定义路由id=51的备(VIP=192.168.0.200)
    state BACKUP
    interface eth0
    virtual_router_id 51
    priority 99
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.0.200
    }
}

五、启动keepalived服务
service keepalived start
或者
/etc/init.d/keepalived start
或者
/usr/local/keepalived/sbin/keepalived

#需要分别启动NodeA,NodeB上的keepalived服务

六、验证服务
1. 运行命令ip addr|a|address查看eth0上的ip
2. 停止NodeA或NodeB, 检查ip是否能够成功漂移到正常的节点

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