• LVS+keepalive配置DNS的UDP53端口负载均衡

    两台rs需要进行lvs相关配置我这里用脚本实现，对于后端RS无论tcpudp都是一样的。

    将脚本放到/etc/init.d/ 下

    赋予执行权限

    chmod +x /etc/init.d/realserver

    执行脚本

    /etc/init.d/realserver restart

    设置开机自启动

    chkconfig realserver on

    1. #!/bin/bash
    2. # chkconfig: - 95 50
    3. # description: Config realserver lo and apply noarp 
    4. #2019年12月23日 wendianfei upload
    5. #This VIPS can write more than two IP separated by spaces.for example:VIPS="10.10.10.10 10.10.10.11 192.168.1.10 192.168.1.11"
    6. #Then,You need to confirm that the program is configured to start automatically. "chkconfig realserver on"
    7. VIPS="10.21.17.97"
    8. OLD_VIPS=`/sbin/ip a show dev lo |grep 'global'|awk '{print $4}'`
    9.  
    10. . /etc/rc.d/init.d/functions
    11. start() {
    12.       for VIP in $VIPS
    13.       do
    14.       ifconfig lo:`echo $VIP|awk -F. '{print $3"-"$4}'` $VIP netmask 255.255.255.255 broadcast $VIP
    15.       /sbin/route add -host $VIP dev lo:`echo $VIP|awk -F. '{print $3"-"$4}'`
    16.       done
    17.       echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
    18.       echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
    19.       echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
    20.       echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
    21.       echo "RealServer Start:                          [ OK ]"
    22. }
    23.  
    24. stop() {
    25.       for VIP  in $OLD_VIPS
    26.       do
    27.       ifconfig lo:`echo $VIP|awk -F. '{print $3"-"$4}'` down
    28.       route del  $VIP  >/dev/null 2>&1
    29.       done
    30.       echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore
    31.       echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce
    32.       echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore
    33.       echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
    34.       echo "RealServer Stoped:                         [ OK ]"
    35. }
    36.  
    37.  
    38. case "$1" in
    39.     start)
    40.          start
    41.          ;;
    42.     stop)
    43.          stop
    44.          ;;
    45.     restart)
    46.          stop
    47.          start
    48.          ;;
    49. *)
    50.       echo "Usage: $0 {start|stop|restart}"
    51.       exit 1
    52. esac
    53.  
    54. exit 0

    配置完后端rs的lvs配置后，安装并配置keepalived服务端。

    yum install -y keepalived.x86_64

    yum install -y ipvsadm

    接下来配置keepalive。

    UDP和TCP的主要区别就是，keepalve本身支持TCP的检测，UDP的不行，所以UDP要用到

    MISC_CHECK模块自己写脚本进行检测，keepalive服务认为，脚本返回值为0代表正常，返回值为1代表异常。我们的脚本可以只要能实现正常返回0，异常范围1即可，可以自由发挥。

    ###主keepavlie配置

    1. ### Config file keepalived LVS
    2. global_defs {
    3.    router_id LVS_Server_1
    4.    script_user root
    5.    enable_script_security
    6.  }
    7.  
    8. vrrp_instance LVS_1 {
    9.     state MASTER           #备的为BACKUP
    10.     interface ens192
    11.     virtual_router_id 151
    12.     priority 150          #主的大于备的
    13.     advert_int 2
    14.     authentication {
    15.         auth_type PASS
    16.         auth_pass wdf.com
    17.     }
    18.     
    19.  virtual_ipaddress {
    20.         10.21.17.97
    21.     }
    22. }
    23.  
    24.  
    25. virtual_server_group dns-udp-53 {
    26.     10.21.17.97 53
    27. }
    28.  
    29. virtual_server group dns-udp-53 {
    30.     delay_loop 5
    31.     lb_algo wrr
    32.     lb_kind DR
    33.     protocol UDP
    34.  
    35.     real_server 10.21.17.60 53 {
    36.         weight 10
    37.         MISC_CHECK {
    38.         misc_path "/root/check_dns.sh  10.21.17.60"
    39.         misc_timeout 10
    40.         misc_dynamic
    41.         }
    42.     }
    43.     real_server 10.21.17.61 53 {
    44.         weight 10
    45.         MISC_CHECK {
    46.         misc_path "/root/check_dns.sh  10.21.17.61"
    47.         misc_timeout 10
    48.         misc_dynamic
    49.         }
    50.     }
    51.  
    52.  
    53. }

    备：keepalive配置

    1. ## Config file keepalived LVS
    2.  
    3. global_defs {
    4.    router_id LVS_Server_1
    5.    script_user root
    6.    enable_script_security
    7.  }
    8.  
    9. vrrp_instance LVS_1 {
    10.     state BACKUP
    11.     interface ens192
    12.     virtual_router_id 151
    13.     priority 80
    14.     advert_int 2
    15.     authentication {
    16.         auth_type PASS
    17.         auth_pass wdf.com
    18.     }
    19.     
    20.  virtual_ipaddress {
    21.         10.21.17.97
    22.     }
    23. }
    24.  
    25.  
    26. virtual_server_group dns-udp-53 {
    27.     10.21.17.97 53
    28. }
    29.  
    30. virtual_server group dns-udp-53 {
    31.     delay_loop 5
    32.     lb_algo wrr
    33.     lb_kind DR
    34.     protocol UDP
    35.  
    36.     real_server 10.21.17.60 53 {
    37.         weight 10
    38.         MISC_CHECK {
    39.         misc_path "/root/check_dns.sh  10.21.17.60"
    40.         misc_timeout 10
    41.         misc_dynamic
    42.         }
    43.     }
    44.     real_server 10.21.17.61 53 {
    45.         weight 10
    46.         MISC_CHECK {
    47.         misc_path "/root/check_dns.sh  10.21.17.61"
    48.         misc_timeout 10
    49.         misc_dynamic
    50.         }
    51.     }
    52.  
    53.  
    54. }

    下面附上我的dns服务检测的脚本：

    1. #!/bin/bash
    2. # Program:
    3. #       check health
    4. # History:
    5. # 2022/11/25    wendianfei version:0.0.1
    6. IP=$1  
    7. count=$( /usr/bin/dig @$1 www.wdf.com| grep 192.168.66.1 | wc -l)
    8. echo $count 
    9. if [ ${count} -gt 0 ]
    10. then
    11.  
    12.     exit 0
    13.     
    14. else
    15.  
    16.     exit 1
    17.     
    18. fi

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  • 原文地址：https://blog.csdn.net/qq_26711103/article/details/128092839