keepalived的安装和使用

IP配置

管理IP地址	角色	备注	网卡
192.168.1.114	主调度器（Director）	对外提供VIP服务的地址为192.168.1.88	eth1
192.168.1.205	备用调度器		eth0
192.168.1.115	RS1
192.168.1.116	RS2

 

名词解释：

主节点：  master

备节点:    backup

虚拟路由器冗余协议： VRRP(Virtual Route Redundancy Protocol) ，它的出现是为了解决静态路由的单点故障

2.安装

在主调度器和备用调度器进行同样的安装，不同的是配置文件

安装openssl

yum -y install openssl-devel
tar -xvf keepalived-1.2..tar.gz
cd keepalived-1.2.
./configure --prefix=/usr/local/keepalived --with-kernel-dir=/usr/src/kernels/2.6.-.el6.x86_64/
make
make install

配置规范启动

cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
chkconfig keepalived on

配置配置文件

新建一个配置文件，默认keepalived启动会去/etc/keepalived目录下寻找配置文件

mkdir /etc/keepalived
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/

单实例配置

编辑主调度器的配置文件

! Configuration File for keepalived

global_defs {
   notification_email {
     zy5724@.com
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 127.0.0.1
   smtp_connect_timeout
   router_id LVS_114
}

vrrp_instance VI_1 {
    state MASTER
    interface eth1
    virtual_router_id
    priority 150
    advert_int
    authentication {
        auth_type PASS
        auth_pass
    }
    virtual_ipaddress {
        192.168.1.88
    }
}

从配置文件

! Configuration File for keepalived

global_defs {
   notification_email {
     zy5724@.com
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 127.0.0.1
   smtp_connect_timeout
   router_id LVS_205
}

vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id
    priority
    advert_int
    authentication {
        auth_type PASS
        auth_pass
    }
    virtual_ipaddress {
        192.168.1.88
    }
}

注意上面有4个不一样的配置的地方，一般是三个，主服务器的网卡我配置成了eth1。

测试：

主调度器：

当停掉主调度器，再看从调度器，马上会出现VIP

通过ping 192.168.1.88可以看见当主调度器宕机，从调度器立马会接管主调度器，实现了高可用。

双主多实例配置

主调度器

! Configuration File for keepalived

global_defs {
   notification_email {
     zy5724@.com
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 127.0.0.1
   smtp_connect_timeout
   router_id LVS_114
}

vrrp_instance VI_1 {
    state MASTER
    interface eth1
    virtual_router_id
    priority
    advert_int
    authentication {
        auth_type PASS
        auth_pass
    }
    virtual_ipaddress {
        192.168.1.88
    }
}

vrrp_instance VI_2 {
    state BACKUP
    interface eth1
    virtual_router_id
    priority
    advert_int
    authentication {
        auth_type PASS
        auth_pass
    }
    virtual_ipaddress {
        192.168.1.99
    }
}

主调度器114

从调度器

! Configuration File for keepalived

global_defs {
   notification_email {
     zy5724@.com
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 127.0.0.1
   smtp_connect_timeout
   router_id LVS_205
}

vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id
    priority
    advert_int
    authentication {
        auth_type PASS
        auth_pass
    }
    virtual_ipaddress {
        192.168.1.88
    }
}

vrrp_instance VI_2 {
    state MASTER
    interface eth0
    virtual_router_id
    priority
    advert_int
    authentication {
        auth_type PASS
        auth_pass
    }
    virtual_ipaddress {
        192.168.1.99
    }
}

测试：

主调度器：

从调度器:

配置日志路径

默认的日志是在/var/log/messages中的，我们现在将它配置在“/var/log/keepalived.log”下，注意要关闭selinux

vi /etc/sysconfig/keepalived

#KEEPALIVED_OPTIONS="-D"
KEEPALIVED_OPTIONS="-D -d -S 0"

vi /etc/rsyslog.conf

添加：

#keepalived
local0.*                                               /var/log/keepalived.log

重启日志服务

/etc/init.d/rsyslog restart

重启keepalive的服务就可以看见日志在指定路径下了。