LVS同步连接状态信息(IPVS Connection Synchronization)

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在使用LVS负载均衡器的时候，通常使用主备(master-backup)模式，防止负载均衡器单点故障。

大多数情况使用keepalived+lvs完成架构

请参考

CentOS7 Keepalived+LVS 负载均衡后台节点健康检查

LVS-NAT(Virtual Server via NAT)原理说明与配置用例

LVS-DR(Virtual Server via Direct Routing)原理说明与配置用例

LVS-TUN(Virtual Server via IP Tunneling)原理说明与配置用例

CentOS7 下配置Keepalived为系统服务，开机自动启动。

由于LVS负载均衡器需要保存大量的连接信息，记录每个TCP连接由哪台真实服务器处理。

[root@localhost keepshell]# ipvsadm -L -n -c
IPVS connection entries
pro expire state source virtual destination
TCP 14:58 ESTABLISHED 192.168.80.1:57622 192.168.80.138:8080 192.168.80.135:8080
TCP 14:58 ESTABLISHED 192.168.80.1:57624 192.168.80.138:8080 192.168.80.135:8080
TCP 14:58 ESTABLISHED 192.168.80.1:57621 192.168.80.138:8080 192.168.80.136:8080
TCP 14:58 ESTABLISHED 192.168.80.1:57625 192.168.80.138:8080 192.168.80.136:8080
TCP 14:58 ESTABLISHED 192.168.80.1:57623 192.168.80.138:8080 192.168.80.136:8080
TCP 14:58 ESTABLISHED 192.168.80.1:57626 192.168.80.138:8080 192.168.80.135:8080

当主负载均衡器宕机以后，备机提升为主，但备机缺省没有这些连接信息，会导致客户端的连接失效，为了解决这一问题，LVS在Linux内核实现了同步连接信息的功能.

ipvsadm -L --daemon 查看同步进程信息

ipvsadm --start-daemon master|backup --mcast-interface=网卡名称 --syncid 编号,主备需要一致

ipvsadm --stop-daemon master|backup 停止同步
ipvsadm -L -n -c 查看连接状态信息

下面给出配置

keepalived.conf

! Configuration File for keepalivedglobal_defs {   notification_email {     root@localhost   }   notification_email_from root@localhost     smtp_server localhost     smtp_connect_timeout 30     router_id  NodeA}vrrp_instance VI_1 {    state MASTER    interface eno16777736    virtual_router_id 51    priority 100    nopreempt     advert_int 5    authentication {        auth_type PASS        auth_pass 1111    }    virtual_ipaddress {        192.168.80.138    }    notify_master /home/keepshell/notify_master.sh    notify_backup /home/keepshell/notify_backup.sh    notify_fault  /home/keepshell/notify_fault.sh    notify_stop   /home/keepshell/notify_stop.sh}virtual_server 192.168.80.138 8080 {    delay_loop 6                     lb_algo rr                        lb_kind DR                             persistence_timeout 0              protocol TCP                       real_server 192.168.80.135 8080 {          weight 1                              HTTP_GET {            url {               path /index.jsp              digest 5cce221db9752be2116860efb866144e            }            connect_timeout 5            nb_get_retry 3            delay_before_retry 3        }          }   real_server 192.168.80.136 8080 {           weight 1        HTTP_GET {            url {               path /index.jsp              digest 345e829e9a900a87a8fce740ef243198            }            connect_timeout 5            nb_get_retry 3            delay_before_retry 3        }           }}

notify_master.sh

#!/bin/bashecho $(date "+%Y-%m-%d %H:%M:%S") "The keepalived service is master." >> /home/keepshell/gexin.txtipvsadm --stop-daemon backupipvsadm --start-daemon master --mcast-interface=eno16777736 --syncid 1

notify_backup.sh

#!/bin/bashecho $(date "+%Y-%m-%d %H:%M:%S") "The keepalived service is backup." >> /home/keepshell/gexin.txtipvsadm --stop-daemon masteripvsadm --start-daemon backup --mcast-interface=eno16777736 --syncid 1

notify_stop.sh

#!/bin/bashecho $(date "+%Y-%m-%d %H:%M:%S") "The keepalived service is stop." >> /home/keepshell/gexin.txtipvsadm --stop-daemon masteripvsadm --stop-daemon backup

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