Keepalived+LVS-DR模式配置高可用负载均衡集群

yonght

实验拓扑如下：

二、服务器ip配置信息

1. ip_lb 主机(master) :

2.ip_lb_2 主机 (backup)

3.web1 主机

4.web2 主

三、在master和backup分别查看是否有ipvsadm软件

1. 检查ipvsadm是否安装

rpm -qa ipvsadm*

rpm -vih ipvsadm*

yum install -y ipvsadm*

yum 配置文件

[maweibing]
named=maweibing
baseurl=file:///mnt/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release

2. 检查模版是否加入内核

[iyunv@localhost ~]# lsmod |grep ip_vs
ip_vs 78081 0

四、分别在web1和web2上面安装apache服务.
# 安装apache服务不说明了. 开放的端口是:80

五、在master主机(192.168.96.2)和backup主机(192.168.96.22)上安装keepalived
1. keepalived-1.2.1.tar.gz # 解压这个文件并且安装 (tar -zxvf keepalived-1.2.1.tar.gz)
2. ./configure --prefix=/home/keepalived/ --with-kernel-dir=/usr/src/kernels/2.6.18-164.el5-i686
3.make
4.make install
5.配置文件的路径
cp /home/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
cp /home/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
cp /home/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
cp /home/keepalived/sbin/keepalived /sbin/

6.配置keepalived.conf文件.( ip_lb 主机<master> )
vim /etc/keepalived/keepalived.conf

• [Shell] 纯文本查看 复制代码

  #global define
  global_defs {
  router_id LVS_T1
  }
  vrrp_sync_group bl_group {
  group {
  bl_one
  }
  }
  vrrp_instance bl_one {
  state MASTER
  interface eth0
  lvs_sync_daemon_interface eth0
  virtual_router_id 38
  priority 150
  advert_int 3
  authentication {
  auth_type PASS
  auth_pass 1111
  }
  virtual_ipaddress {
  192.168.96.100
  }
  }
  virtual_server 192.168.96.100 8099 {
  delay_loop 3
  lb_algo rr
  lb_kind DR
  persistence_timeout 1
  protocol TCP
  real_server 192.168.96.33 8099 {
  weight 1
  TCP_CHECK {
  connect_timeout 10
  nb_get_retry 3
  delay_before_retry 3
  connect_port 8099
  }
  }
  real_server 192.168.96.4 8099 {
  weight 1
  TCP_CHECK {
  connect_timeout 10
  nb_get_retry 3
  delay_before_retry 3
  connect_port 8099
  }
  }
  }

  
  

7、配置keepalived.conf文件.(ip_lb_2 主机 <backup> )
vim /etc/keepalived/keepalived.conf

• [Shell] 纯文本查看 复制代码

  #global define
  global_defs {
  router_id LVS_T2
  }
  vrrp_sync_group bl_group {
  group {
  bl_one
  }
  }
  vrrp_instance bl_one {
  state BACKUP
  interface eth0
  lvs_sync_daemon_interface eth0
  virtual_router_id 38
  priority 120
  advert_int 3
  authentication {
  auth_type PASS
  auth_pass 1111
  }
  virtual_ipaddress {
  192.168.96.100
  }
  }
  virtual_server 192.168.96.100 8099 {
  delay_loop 3
  lb_algo rr
  lb_kind DR
  persistence_timeout 1
  protocol TCP
  real_server 192.168.96.33 8099 {
  weight 1
  TCP_CHECK {
  connect_timeout 10
  nb_get_retry 3
  delay_before_retry 3
  connect_port 8099
  }
  }
  real_server 192.168.96.4 8099 {
  weight 1
  TCP_CHECK {
  connect_timeout 10
  nb_get_retry 3
  delay_before_retry 3
  connect_port 8099
  }
  }
  }

  
  

8. 分别在主备上启动keepalived
[iyunv@ip_lb home]# /etc/init.d/keepalived start
Starting keepalived: [ OK ]

[iyunv@ip_lb home]# tail -f /var/log/message


# PS:这里说的LVS.并不是用ipvsadm软件配置.而是直接用keepalived的virtual_server配置项控制的.
# 安装ipvsadm只是可以看到负载状况.其实只需要keepalived也可以实现负载均衡集群.

六、在web1和web2主机上配置LVS-DR的相关配置.
1. vim /etc/init.d/lvsDR_node （web1主机）

• [Shell] 纯文本查看 复制代码

  #! /bin/sh
  # descript : start real server DR
  VIP=192.168.96.100
  . /etc/rc.d/init.d/functions
  case "$1" in
  start)
  echo "start LVS of RealServer DR"
  /sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up
  echo "1" > /proc/sys/net/ipv4/conf/all/arp_ignore
  echo "2" > /proc/sys/net/ipv4/conf/all/arp_announce
  ;;
  stop)
  /sbin/ifconfig lo:0 down
  echo "close LVS of RealServer DR"
  echo "0" > /proc/sys/net/ipv4/conf/all/arp_ignore
  echo "0" > /proc/sys/net/ipv4/conf/all/arp_announce
  ;;
  *)
  echo "Usage : $0 {start|stop}"
  exit 1
  esac

  
  

2. 把这个文件复制到web2主机上.
3. 在web1和web2上分别启动这个脚本:
/etc/init.d/lvsDR_node start

七、web1和web2主机上开启httpd服务.
/etc/init.d/httpd start

# ================= TEST =======================================

八、测试是否可以负载均衡.
编写测试脚本:

• [Shell] 纯文本查看 复制代码

  #! /bin/sh
  for((i=1;i<=100;i++));do
  curl [url]http://192.168.96.100:8099[/url] >> /tmp/q;
  done

  
  

结果:


九、测试断开一个web服务或加入一个web服务
现在关闭 web2主机(192.168.96.4) 的web 服务..
查看日志可以看到:


现在再把 web2主机(192.168.96.4)的web 服务加入进来:
查看日志可以看到:


十、 测试HA
现在模拟主(master)的keepalived主机死掉.
备机的日志文件:


可以看到备机的keepalived已经开始工作....

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