keepalived实现haproxy高可用

keepalived安装

1、下载解压

wget http://www.keepalived.org/software/keepalived-1.2.16.tar.gz

注意：如果安装出错可能需要安装一些插件

yum -y install openssl-devel

2、解压安装

tar –zxvf keepalived-1.2.16.tar.gz
cd keepalived-1.2.16
./configure --prefix=/iflytek/soft/keepalived
make && make install

3、添加进系统服务

cp /iflytek/soft/keepalived/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
cp /iflytek/soft/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
cp /iflytek/soft/keepalived/sbin/keepalived /usr/sbin/
mkdir /etc/keepalived
cp /iflytek/soft/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
chmod +x /etc/init.d/keepalived

4、配置keepalived.conf

  vim /etc/keepalived/keepalived.cfg

master配置

! Configuration File for keepalived
 
global_defs {   
   notification_email {   
     [email protected]   
   }   
   notification_email_from [email protected]   
   smtp_server 127.0.0.1   
   smtp_connect_timeout 30   
   router_id HAProxy_DEVEL   
}
vrrp_script chk_haproxy {
  script "killall -0 haproxy" # check the haproxy process
  interval 2 # every 2 seconds
  weight 2 # add 2 points if OK
}
vrrp_instance HAProxy_HA {
  interface eth0 # interface to monitor
  state MASTER # MASTER on ha1, BACKUP on ha2
  virtual_router_id 51
  # mcast_src_ip 10.1.100.219
  priority 101 # 101 on ha1, 100 on ha2
  advert_int 1
  authentication {   
    auth_type PASS   
    auth_pass 1qaz2wsx   
  }
  virtual_ipaddress {
    172.16.17.222 dev eth0 label eth0:1 # virtual ip address
  }
  track_interface {   
    eth0   
  }
  track_script {
    chk_haproxy
  }
  unicast_src_ip 172.16.17.100
  unicast_peer {
    172.16.17.89
  }
}

slave配置

! Configuration File for keepalived
 
global_defs {   
   notification_email {   
     [email protected]   
   }   
   notification_email_from [email protected]   
   smtp_server 127.0.0.1   
   smtp_connect_timeout 30   
   router_id HAProxy_DEVEL   
}
vrrp_script chk_haproxy {
  script "killall -0 haproxy" # check the haproxy process
  interval 2 # every 2 seconds
  weight 2 # add 2 points if OK
}
vrrp_instance HAProxy_HA {
  interface eth0 # interface to monitor
  state BACKUP # MASTER on ha1, BACKUP on ha2
  virtual_router_id 51
  # mcast_src_ip 10.1.100.219
  priority 100 # 101 on ha1, 100 on ha2
  advert_int 1
  authentication {   
    auth_type PASS   
    auth_pass 1qaz2wsx   
  }
  virtual_ipaddress {
    172.16.17.222 dev eth0 label eth0:1 # virtual ip address
  }
  track_interface {   
    eth0   
  }
  track_script {
    chk_haproxy
  }
  unicast_src_ip 172.16.17.89
  unicast_peer {
    172.16.17.100
  }
}

注意：
备用服务器仅仅只需要改一下 state属性，然后换一下主备IP的位置

5、启动

service keepalived start    #启动
service keepalived stop   #停止
service keepalived restart   #重启