[转载]LVS+Keepalived之三大模式

LVS + Keepalived之三大模式

======================================================================================

NAT模式:

======================================================================================

一、仅lvs服务器端安装

yum install ipvsadm openssl-devel popt popt-devel libnl-devel

cd /opt/src/

tar xzvf keepalived-1.2.7.tar.gz

cd keepalived-1.2.7

./configure

make && make install

cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/

cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/

mkdir /etc/keepalived

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

cp /usr/local/sbin/keepalived /usr/sbin/

修改/etc/keepalived/keepalived.conf文件

[root@WEB ~]# cat /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {

   notification_email {

     123@123.com

   }

   notification_email_from 123@123.com

   smtp_server mail.123.com

   smtp_connect_timeout 30

   router_id LVS_DEVEL

}

vrrp_instance VI_1 {

    state MASTER

    interface eth0

    virtual_router_id 52

    priority 100

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass 1111

    }

    virtual_ipaddress {

       88.88.88.88

    }

}

vrrp_instance LAN_GATEWAY {

    state MASTER

    interface eth1

    virtual_router_id 52

    priority 100

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass 1111

    }

    virtual_ipaddress {

        192.168.1.88

    }

}

virtual_server 88.88.88.88 80 {

    delay_loop 6

    lb_algo lc

    #lb_kind DR

    #lb_kind TUN

    lb_kind NAT

    persistence_timeout 60

    protocol TCP

    real_server 192.168.1.18 80 {

        weight 3

        TCP_CHECK {

        connect_timeout 30

        nb_get_retry 3

        delay_before_retry 2

        connect_port 80

        }

    }

    real_server 192.168.1.68 80 {

        weight 3

        TCP_CHECK {

        connect_timeout 30

        nb_get_retry 3

        delay_before_retry 2

        connect_port 80

        }

     }

 }

[root@WEB ~]#

[root@WEB ~]# service ipvsadm start

[root@WEB ~]# service keepalived start

注意：

echo "1" > /proc/sys/net/ipv4/ip_forward

二、实际服务器端的操作

将网关设置为lanvip的地址192.168.1.88

三、lvs查看

ipvsadm -ln

ipvsadm -lnc

ipvsadm -l -n --stats

调度算法：rr|wrr|lc|wlc|lblc|lblcr|dh|sh|sed|nq

======================================================================================

TUN模式:

======================================================================================

一、仅lvs服务器端安装

yum install ipvsadm openssl-devel popt popt-devel libnl-devel

cd /opt/src/

tar xzvf keepalived-1.2.7.tar.gz

cd keepalived-1.2.7

./configure

make && make install

cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/

cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/

mkdir /etc/keepalived

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

cp /usr/local/sbin/keepalived /usr/sbin/

修改/etc/keepalived/keepalived.conf文件

[root@WEB ~]# cat /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {

   notification_email {

     123@123.com

   }

   notification_email_from 123@123.com

   smtp_server mail.123.com

   smtp_connect_timeout 30

   router_id LVS_DEVEL

}

vrrp_instance VI_1 {

    state MASTER

    interface eth0

    virtual_router_id 52

    priority 100

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass 1111

    }

    virtual_ipaddress {

       192.168.1.88

    }

}

virtual_server 192.168.1.88 80 {

    delay_loop 6

    lb_algo lc

    lb_kind TUN

    persistence_timeout 60

    protocol TCP

    real_server 192.168.2.18 80 {

        weight 3

        TCP_CHECK {

        connect_timeout 30

        nb_get_retry 3

        delay_before_retry 2

        connect_port 80

        }

    }

    real_server 192.168.3.68 80 {

        weight 3

        TCP_CHECK {

        connect_timeout 30

        nb_get_retry 3

        delay_before_retry 2

        connect_port 80

        }

     }

 }

[root@WEB ~]#

[root@WEB ~]# service ipvsadm start

[root@WEB ~]# service keepalived start

注意：

打开转发或关闭，dr/tun模式无影响

echo "1" > /proc/sys/net/ipv4/ip_forward

二、实际服务器端的操作

[root@]# cat /usr/local/vip_tun.sh

#!/bin/bash

#srcipt to start LVS TUN realserver

VIP=192.168.1.88

case "$1" in

start)

#start LVS-TUN real server on this machine

echo 1 >/proc/sys/net/ipv4/conf/tunl0/arp_ignore

echo 2 >/proc/sys/net/ipv4/conf/tunl0/arp_announce

echo 1 >/proc/sys/net/ipv4/conf/all/arp_ignore

echo 2 >/proc/sys/net/ipv4/conf/all/arp_announce

echo 0 >/proc/sys/net/ipv4/conf/tunl0/rp_filter

echo 0 >/proc/sys/net/ipv4/conf/all/rp_filter

sysctl -p >/dev/null 2>&1

/sbin/modprobe ipip

/sbin/ifconfig tunl0 $VIP broadcast $VIP netmask 255.255.255.255  up

/sbin/route add -host $VIP dev tunl0

/sbin/ifconfig eth0 mtu 1440

;;

stop)

#stop lvs-TUN real server loopback device

echo 0 > /proc/sys/net/ipv4/conf/tunl0/arp_ignore

echo 0 > /proc/sys/net/ipv4/conf/tunl0/arp_announce

echo 1 > /proc/sys/net/ipv4/conf/tunl0/rp_filter

echo 0 > /proc/sys/net/ipv4/conf/all/arp_ignore

echo 0 > /proc/sys/net/ipv4/conf/all/arp_announce

echo 1 > /proc/sys/net/ipv4/conf/all/rp_filter

/sbin/ifconfig tunl0 down

/sbin/modprobe -r ipip

/sbin/ifconfig eth0 mtu 1500

;;

status)

islothere='/sbin/ifconfig tunl0 |grep $VIP'

isrothere='netstat -rn |grep "tunl0"|grep $VIP'

if [ ! "$islothere" -o ! "$isrothere" ];then

echo "LVS-TUN real server stopped"

else echo "LVS-TUN Running"

fi

;;

*)

echo "$0: Usage: $0 {start|stop|status}"

exit 1

;;

esac

[root@localhost ~]#  /usr/local/vip.sh start|stop|status

三、lvs查看

ipvsadm -ln

ipvsadm -lnc

ipvsadm -l -n --stats

调度算法：rr|wrr|lc|wlc|lblc|lblcr|dh|sh|sed|nq

======================================================================================

DR模式:

======================================================================================

一、仅lvs服务器端安装

yum install ipvsadm openssl-devel popt popt-devel libnl-devel

cd /opt/src/

tar xzvf keepalived-1.2.7.tar.gz

cd keepalived-1.2.7

./configure

make && make install

cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/

cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/

mkdir /etc/keepalived

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

cp /usr/local/sbin/keepalived /usr/sbin/

修改/etc/keepalived/keepalived.conf文件

[root@WEB ~]# cat /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {

   notification_email {

     123@123.com

   }

   notification_email_from 123@123.com

   smtp_server mail.123.com

   smtp_connect_timeout 30

   router_id LVS_DEVEL

}

vrrp_instance VI_1 {

    state MASTER

    interface eth0

    virtual_router_id 52

    priority 100

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass 1111

    }

    virtual_ipaddress {

       192.168.1.88

    }

}

virtual_server 192.168.1.88 80 {

    delay_loop 6

    lb_algo lc

    lb_kind DR

    persistence_timeout 60

    protocol TCP

    real_server 192.168.1.18 80 {

        weight 3

        TCP_CHECK {

        connect_timeout 30

        nb_get_retry 3

        delay_before_retry 2

        connect_port 80

        }

    }

    real_server 192.168.1.68 80 {

        weight 3

        TCP_CHECK {

        connect_timeout 30

        nb_get_retry 3

        delay_before_retry 2

        connect_port 80

        }

     }

 }

[root@WEB ~]#

[root@WEB ~]# service ipvsadm start

[root@WEB ~]# service keepalived start

注意：

打开转发或关闭，dr/tun模式无影响

echo "1" > /proc/sys/net/ipv4/ip_forward

二、实际服务器端的操作

[root@localhost ~]# cat /usr/local/vip.sh

#!/bin/bash

# Script to start LVS DR real server.

# description: LVS DR real server

.  /etc/rc.d/init.d/functions

VIP=192.168.1.88

#host=`/bin/hostname`

case "$1" in

start)

       # Start LVS-DR real server on this machine.

        /sbin/ifconfig lo down

        /sbin/ifconfig lo up

        echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore

        echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce

        echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore

        echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce

        /sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up

        /sbin/route add  $VIP dev lo:0

;;

stop)

        # Stop LVS-DR real server loopback device(s).

        /sbin/ifconfig lo:0 down

        echo 0 > /proc/sys/net/ipv4/conf/lo/arp_ignore

        echo 0 > /proc/sys/net/ipv4/conf/lo/arp_announce

        echo 0 > /proc/sys/net/ipv4/conf/all/arp_ignore

        echo 0 > /proc/sys/net/ipv4/conf/all/arp_announce

;;

status)

        # Status of LVS-DR real server.

        islothere=`/sbin/ifconfig lo:0 | grep $VIP`

        isrothere=`netstat -rn | grep "lo:0" | grep $VIP`

        if [ ! "$islothere" -o ! "isrothere" ];then

            # Either the route or the lo:0 device

            # not found.

            echo "LVS-DR real server Stopped."

        else

            echo "LVS-DR real server Running."

        fi

;;

*)

            # Invalid entry.

            echo "$0: Usage: $0 {start|status|stop}"

            exit 1

;;

esac

[root@localhost ~]#  /usr/local/vip.sh start|stop|status

三、lvs查看

ipvsadm -ln

ipvsadm -lnc

ipvsadm -l -n --stats

调度算法：rr|wrr|lc|wlc|lblc|lblcr|dh|sh|sed|nq

注意：

    1.TUN模式使用的IP都要是公网IP.

    2.VIP的port要和后端realserver的port保持一致，但是不会影响VIP本机的port被其他服务使用.

转载自：http://www.gaizaoren.com/archives/998

附加：
LVS可以使用iptables同时做多个服务的负载均衡并实现持久化连接，使用iptables对包打上标签之后再进行匹配处理。配置如下：

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[转载]LVS+Keepalived之三大模式

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