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Can'tGetVariablesFromShardingNode.md

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dble-Can't get variables from shardingNode

Setting

  • db.xml 片段
<dbGroup name="localhost1" rwSplitMode="0" delayThreshold="100">
<heartbeat>show slave status</heartbeat>
<dbInstance host="hostM1" url="localhost:3306" user="root"  password="nE7jA%5m" maxCon="1000" minCon="10" primary="true" >  </dbInstance>
</dbGroup>
<dbGroup name="localhost2" rwSplitMode="0" delayThreshold="100">
<heartbeat>show slave status</heartbeat>
<dbInstance host="hostM2" url="localhost:3306" user="root"  password="nE7jA%5m" maxCon="1000" minCon="10" primary="true">  </dbInstance>  </dbGroup>

Issue

  • 查看dble启动日志:
Running dble-server...
wrapper | --> Wrapper Started as Console
wrapper | Launching a JVM...
jvm 1   | Wrapper (Version 3.2.3)
http://wrapper.tanukisoftware.org
jvm 1   | Copyright 1999-2006 Tanuki Software, Inc. All Rights Reserved.
jvm 1   |
jvm 1   | java.io.IOException:Can't get variables from shardingNode  ...
wrapper | <-- Wrapper Stopped

Resolution

  1. 检查mysql版本及是否正常启动,不支持mysql5.1,请升级mysql, 如果启动正常见下一步;
  2. db.xml中的root用户能否通过配置文件的信息连接mysql,连接成功见下一步;
  3. 检查root用户权限;
  4. 连接mysql,并执行show variables命令,未执行成功见下一步;
  5. 修改配置文件中dbGroup指定的后端数据库密码,更新配置文件,dble正常启动

Root Cause

  • 通过db.xml 配置信息成功连接mysql后,并不能执行show variables
  • 由于mysql 5.7 初始化之后,首次使用随机密码登陆,没有修改密码,无法对数据库进行操作

Relevant Content

  1. 安装好mysql5.7后,第一次初始化数据库
  2. 随机密码登录mysql,首次登录后,mysql要求必须修改默认密码,否则不能执行任何其他数据库操作,这样体现了不断增强的Mysql安全性。
  3. 第一次登陆后必须更改密码:
    • mysql> show databases;
    • ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
    • mysql > set password = password('xxxxxx');