Neo4j企业版支持集群及高可用架构，但是社区版本不支持，故才有结合第三方软件来做高可用架构。
架构图如下：
DRBD双主配置： http://www.ywnds.com/?p=6619
Neo4j配置安装：http://www.ywnds.com/?p=12015
Keepalived安装配置：http://www.ywnds.com/?p=7963
上面的几个组件的安装配置调试这里就不介绍了，看给出的链接文档即可。
这里主要说一下这种模式的keepalived配置文件：
MASTER配置
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! Configuration File for keepalived global_defs { notification_email { dkey@ywnds.com } notification_email_from root@localhost smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id LVS_DEVEL } vrrp_script check_neo4j { script "/data/scripts/check_neo4j.sh" interval 1 fall 2 } vrrp_instance VI_1 { state MASTER interface eth0 virtual_router_id 52 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 10.100.215.2 dev eth0 label eth0:vip } notify_stop /data/scripts/notify_stop.sh notify_master /data/scripts/notify_master.sh track_script { check_neo4j } } |
check_neo4j：检测neo4j是否有问题的脚本。
notify_stop：MASTER出现故障时执行的脚本。
notify_master：当角色变为MASTER时执行的脚本。
/data/scripts/check_neo4j.sh
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#!/bin/sh A=`ps aux | grep -w "neo4j-community-3.2.6" | wc -l` if [ $A -lt 2 ];then echo $A > /tmp/check.log reboot fi |
/data/scripts/notify_stop.sh
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#!/bin/bash time=`date "+%F %H:%M:%S"` echo -e "$time ------notify_stop------\n" >> /data/logs/keepalived/notify_stop.log /bin/umount /data/drbd >> /data/logs/keepalived/notify_stop.log /usr/sbin/drbdadm secondary neo4j >> /data/logs/keepalived/notify_stop.log /usr/bin/systemctl stop keepalived >> /data/logs/keepalived/notify_stop.log echo -e "\n" >> /data/logs/keepalived/notify_stop.log |
/data/scripts/notify_master.sh
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#!/bin/bash time=`date "+%F %H:%M:%S"` echo -e "$time ------notify_master------\n" >> /data/logs/keepalived/notify_master.log ssh root@inte-neo4j-02 "reboot" >> /data/logs/keepalived/notify_master.log drbdadm primary neo4j >> /data/logs/keepalived/notify_master.log mount /dev/drbd1 /data/drbd >> /data/logs/keepalived/notify_master.log /data/drbd/neo4j-community-3.2.6/bin/neo4j start >> /data/logs/keepalived/notify_master.log echo -e "\n" >> /data/logs/keepalived/notify_master.log |
BACKUP配置
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! Configuration File for keepalived global_defs { notification_email { dkey@ywnds.com } notification_email_from root@localhost smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id LVS_DEVEL } vrrp_instance VI_1 { state BACKUP interface eth0 virtual_router_id 52 priority 90 advert_int 1 authentication { auth_type PASS auth_pass 1111 } notify_master /data/scripts/notify_master.sh notify_backup /data/scripts/notify_backup.sh virtual_ipaddress { 10.100.215.2 dev eth0 label eth0:vip } } |
notify_master：当角色变为MASTER时执行的脚本。
notify_backup：当角色变为BACKUP时执行的脚本。
/data/scripts/notify_master.sh
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#!/bin/bash time=`date "+%F %H:%M:%S"` echo -e "$time ------notify_master------\n" >> /data/logs/keepalived/notify_master.log ssh root@inte-neo4j-01 "reboot" >> /data/logs/keepalived/notify_master.log drbdadm primary neo4j >> /data/logs/keepalived/notify_master.log mount /dev/drbd1 /data/drbd >> /data/logs/keepalived/notify_master.log /data/drbd/neo4j-community-3.2.6/bin/neo4j start >> /data/logs/keepalived/notify_master.log echo -e "\n" >> /data/logs/keepalived/notify_master.log |
/data/scripts/notify_backup.sh
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#!/bin/bash time=`date "+%F %H:%M:%S"` echo -e "$time ------notify_backup------\n" >> /data/logs/keepalived/notify_backup.log /bin/umount /data/drbd >> /data/logs/keepalived/notify_backup.log /usr/sbin/drbdadm secondary neo4j >> /data/logs/keepalived/notify_backup.log echo -e "\n" >> /data/logs/keepalived/notify_backup.log |
然后可以在脚本里面添加各种短信或邮件报警通知，另外需要根据自己的环境更改脚本内容。
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