fgdfg 发表于 2015-11-20 04:15:36

LVS + keepalived 实现负载均衡

1. 下载相关软件包

    #mkdir /usr/local/src/lvs
    #cd /usr/local/src/lvs
    #wget http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.24.tar.gz
    #wget http://www.keepalived.org/software/keepalived-1.1.15.tar.gz
2. 安装LVS和Keepalived

#lsmod |grep ip_vs
         #uname -r
         2.6.18-53.el5PAE
需要安装 :
yum install -y kernel-devel
         #ln -s /usr/src/kernels/2.6.18-53.el5PAE-i686//usr/src/linux

         #tar zxvf ipvsadm-1.24.tar.gz
         #cd ipvsadm-1.24
         #make && make install
         #find / -name ipvsadm# 查看ipvsadm的位置
#tar zxvf keepalived-1.1.15.tar.gz
需要安装 :
  yum -y install openssl-devel
         #cd keepalived-1.1.15
         #./configure&& make && make install
         #find / -name keepalived# 查看keepalived位置
#cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
         #cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
         #mkdir -p /etc/keepalived
         #cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
         #cp /usr/local/sbin/keepalived /usr/sbin/
         #service keepalived start|stop   #做成系统启动服务方便管理.
3. 配置Realserver脚本.
   #vi /usr/local/sbin/realserver.sh
         #!/bin/bash
         # description: Config realserver lo and apply noarp
         #Written by :NetSeek http://www.linuxtone.org
         
         SNS_VIP=192.168.1.163
         
         . /etc/rc.d/init.d/functions
         
         case "$1" in
         start)
                ifconfig lo:0 $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP
                /sbin/route add -host $SNS_VIP dev lo:0
                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
                sysctl -p >/dev/null 2>&1
                echo "RealServer Start OK"
         
                ;;
         stop)
                ifconfig lo:0 down
                route del $SNS_VIP >/dev/null 2>&1
                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
                echo "RealServer Stoped"
                ;;
         *)
                echo "Usage: $0 {start|stop}"
                exit 1
         esac
         
         exit 0
4. 配置在主负载均衡服务器上配置keepalived.conf
vi /etc/keepalived/keepalived.conf

! Configuration File for keepalived
global_defs {
    notification_email {
          cnseek@gmail.com
    }
    notification_email_from sns-lvs@gmail.com
    smtp_server 127.0.0.1
   # smtp_connect_timeout 30
    router_id LVS_DEVEL
}
# 20081013 written by :netseek
# VIP1
vrrp_instance VI_1 {
   state MASTER             #备份服务器上将MASTER改为BACKUP   
   interface eth0
   virtual_router_id 51
   priority 100    # 备份服务上将100改为99
   advert_int 1
   authentication {
         auth_type PASS
         auth_pass 1111
   }
   virtual_ipaddress {
         61.164.122.8   
         #(如果有多个VIP,继续换行填写.)
   }
}
virtual_server 61.164.122.8 80 {
   delay_loop 6                  #(每隔10秒查询realserver状态)
   lb_algo wrr                  #(lvs 算法)
   lb_kind DR                  #(Direct Route)
   persistence_timeout 60      #(同一IP的连接60秒内被分配到同一台realserver)
   protocol TCP                #(用TCP协议检查realserver状态)
   real_server 61.164.122.9 80 {
         weight 3               #(权重)
         TCP_CHECK {
         connect_timeout 10       #(10秒无响应超时)
         nb_get_retry 3
         delay_before_retry 3
         connect_port 80
         }
   }
   real_server 61.164.122.10 80 {
         weight 3
         TCP_CHECK {
         connect_timeout 10
         nb_get_retry 3
         delay_before_retry 3
         connect_port 80
         }
      }
}
      

5. BACKUP服务器同上配置,先安装lvs再按装keepalived,仍后配置/etc/keepalived/keepalived.conf,
只需将标示的部分改一下即可.


6.
#/etc/init.d/keepalived start启动keepalived服务,keepalived就能利用keepalived.conf 配置文件,实现负载均衡和高可用.
查看lvs服务是否正常
#watch ipvsadm -ln

停Master服务器的keepalived服务,查看BAKCUP服务器是否能正常接管服务
页: [1]
查看完整版本: LVS + keepalived 实现负载均衡