服务器之家：专注于服务器技术及软件下载分享
分类导航

云服务器|WEB服务器|FTP服务器|邮件服务器|虚拟主机|服务器安全|DNS服务器|服务器知识|Nginx|IIS|Tomcat|

服务器之家 - 服务器技术 - 服务器知识 - Docker实现Mariadb分库分表及读写分离功能

Docker实现Mariadb分库分表及读写分离功能

2021-03-27 18:11清风云悦 服务器知识

这篇文章主要给大家介绍了关于Docker实现Mariadb分库分表及读写分离功能的相关资料，文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值，需要的朋友们下面来一起学习学习吧

 

一、简介

本文使用docker实现mysql主从配置，读写分离、分库分表等功能。

 

二、环境准备

 

1.基础环境

java

?
1
2
3
java version "1.8.0_111"
Java(TM) SE Runtime Environment (build 1.8.0_111-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.111-b14, mixed mode)

docker

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
Client:
 Version:   18.03.0-ce
 API version:   1.37
 Go version:    go1.9.4
 Git commit:    0520e24
 Built: Wed Mar 21 23:09:15 2018
 OS/Arch:   linux/amd64
 Experimental:  false
 Orchestrator:  swarm
 
Server:
 Engine:
 Version:   18.03.0-ce
 API version:   1.37 (minimum version 1.12)
 Go version:    go1.9.4
 Git commit:    0520e24
 Built: Wed Mar 21 23:13:03 2018
 OS/Arch:   linux/amd64
 Experimental:  false

 

三、安装Mysql主从配置

 

1.部署信息

节点名称 数据名称 节点IP 端口
master marster 192.168.92.50 3306
slave slave 192.168.92.51 3307
mycat mycat 192.168.92.50 8066/9066

 

2.主节点配置文件

创建mysql主节点配置文件

?
1
2
mkdir /usr/local/mysql/master
mkdir conf data

创建主节点配置文件docker.cnf

?
1
2
3
4
5
6
7
8
9
10
11
12
[mysqld]
server-id=1
log-bin=master-bin #只是读写,就只要主库配置即可.如果要做主从切换，那么主库和从库都需要开启.
skip-host-cache
skip-name-resolve
collation-server = utf8_unicode_ci
init-connect='SET NAMES utf8'
character-set-server = utf8
[mysql]
default-character-set=utf8
[client]
default-character-set=utf8

创建从节点配置文件 docker.conf

?
1
2
mkdir /usr/local/mysql/slave
mkdir conf data
?
1
2
3
4
5
6
7
8
9
10
11
12
[mysqld]
server-id=2
log-bin=master-bin
skip-host-cache
skip-name-resolve
collation-server = utf8_unicode_ci
init-connect='SET NAMES utf8'
character-set-server = utf8
[mysql]
default-character-set=utf8
[client]
default-character-set=utf8

 

3.创建mysql容器

此处使用mariadb最新稳定镜像创建容器

创建主节点myslq

?
1
docker run --name master -p 3306:3306 -v /usr/local/mysql/master/conf:/etc/mysql/conf.d -v /usr/local/mysql/master/data:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=123456 -idt mariadb:latest --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci

创建从节点mysql

?
1
docker run --name slave -p 3307:3306 -v /usr/local/mysql/slave/conf:/etc/mysql/conf.d -v /usr/local/mysql/slave/data:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=123456 -idt mariadb:latest --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci

 

4.开启主从复制

step 1 进入主节点

?
1
2
docker exec -it master /bin/bash
mysql -uroot -p

step 2 创建用户

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
create user 'backUser'@'%' identified by 'root';
 
grant replication slave on *.* to 'backUser'@'%';
 
flush privileges;
 
show master status;
MariaDB [(none)]> show master status;
+-------------------+----------+--------------+------------------+
| File    | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+-------------------+----------+--------------+------------------+
| master-bin.000003 |  787 |    |     |
+-------------------+----------+--------------+------------------+
1 row in set (0.000 sec)

step 3 进入从节点创建用户开启同步

?
1
2
3
4
5
docker exec -it slave /bin/bash
 
mysql -uroot -proot
 
change master to master_host='192.168.92.51',master_port=3306,master_user='backUser',master_password='root',master_log_file='master-bin.000003',master_log_pos=787;

开启主从复制：

?
1
start slave;

从节点设置日志和文件名要跟主节点信息对应，包括日志记录起始位置position

检查主从复制是否OK

?
1
show slave status \G;
?
1
2
3
4
5
6
7
8
9
10
11
12
13
*************************** 1. row ***************************
    Slave_IO_State: Waiting for master to send event
     Master_Host: 192.168.92.50
     Master_User: backUser
     Master_Port: 3306
     Connect_Retry: 60
    Master_Log_File: master-bin.000005
   Read_Master_Log_Pos: 343
    Relay_Log_File: mysqld-relay-bin.000002
     Relay_Log_Pos: 556
   Relay_Master_Log_File: master-bin.000005
    Slave_IO_Running: Yes
    Slave_SQL_Running: Yes

Slave出现2个YES,代表主从复制设置成功。

 

5、安装Mycat

下载mycat在50节点实现安装

?
1
2
3
tar -zxvf Mycat-server-1.6.7.1-release-20190213150257-linux.tar.gz
 
mv mycat/ /usr/local/

修改mycat目录下 conf的server.xml 文件，指定用户名和密码

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
<?xml version="1.0" encoding="UTF-8"?>
<!-- - - Licensed under the Apache License, Version 2.0 (the "License");
    - you may not use this file except in compliance with the License. - You
    may obtain a copy of the License at - - http://www.apache.org/licenses/LICENSE-2.0
    - - Unless required by applicable law or agreed to in writing, software -
    distributed under the License is distributed on an "AS IS" BASIS, - WITHOUT
    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - See the
    License for the specific language governing permissions and - limitations
    under the License. -->
<!DOCTYPE mycat:server SYSTEM "server.dtd">
<mycat:server xmlns:mycat="http://io.mycat/">
    <system>
    <property name="nonePasswordLogin">0</property> <!-- 0为需要密码登陆、1为不需要密码登陆 ,默认为0，设置为1则需要指定默认账户-->
    <property name="useHandshakeV10">1</property>
    <property name="useSqlStat">0</property> <!-- 1为开启实时统计、0为关闭 -->
    <property name="useGlobleTableCheck">0</property> <!-- 1为开启全加班一致性检测、0为关闭 -->
    <property name="sequnceHandlerType">0</property>
    <property name="subqueryRelationshipCheck">false</property>
    <property name="processorBufferPoolType">0</property>
    <property name="handleDistributedTransactions">0</property>
    <property name="useOffHeapForMerge">1</property>
        <!--单位为m-->
  <property name="memoryPageSize">64k</property>
        <!--单位为k-->
        <property name="spillsFileBufferSize">1k</property>
        <property name="useStreamOutput">0</property>
        <!--单位为m-->
        <property name="systemReserveMemorySize">384m</property>
        <!--是否采用zookeeper协调切换 -->
        <property name="useZKSwitch">false</property>
        <!-- XA Recovery Log日志名称 -->
        <!--<property name="XARecoveryLogBaseName">tmlog</property>-->
        <!--如果为 true的话 严格遵守隔离级别,不会在仅仅只有select语句的时候在事务中切换连接-->
        <property name="strictTxIsolation">false</property>
        <property name="useZKSwitch">true</property>
    </system>
    <user name="root">
        <property name="password">123456</property>
        <property name="schemas">test</property>
    </user>
</mycat:server>

上述配置，指定以root为用户名，密码为123456，访问虚拟逻辑数据库test。

配置rule规则

修改mycat conf 文件夹下的schema.xml 配置数据库对应规则

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
<?xml version="1.0"?>
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://io.mycat/">
 
    <schema name="test" checkSQLschema="false" sqlMaxLimit="100">
   <table name="tb_user" primaryKey="id" autoIncrement="true" dataNode="dn1,dn2,dn3,dn4" rule="userrule" />
        <table name="tb_category" primaryKey="id" dataNode="dn1,dn2,dn3,dn4" rule="categoryrule" />
    </schema>
    <dataNode name="dn1" dataHost="localhost1" database="db1" />
    <dataNode name="dn2" dataHost="localhost1" database="db2" />
    <dataNode name="dn3" dataHost="localhost1" database="db3" />
    <dataNode name="dn4" dataHost="localhost1" database="db4" />
 
    <dataHost name="localhost1" maxCon="1000" minCon="10" balance="1"
             writeType="0" dbType="mysql" dbDriver="native" switchType="1" slaveThreshold="100">
        <heartbeat>select user()</heartbeat>
        <!-- 读写分离配置 -->
        <writeHost host="hostM1" url="192.168.92.50:3306" user="root"
                 password="123456">
            <readHost host="hostS2" url="192.168.92.51:3307" user="root" password="123456" />
        </writeHost>
    </dataHost>
</mycat:schema>

上述配置scheam name 对应server配置文件的虚拟数据库，指定了2个表信息，tb_user 表主键实现自增长，有4个数据库节点，使用userrule表规则。

dataNode 指定了真实对应的物理数据库节点，对应dataHost说明了读写指定的用户和节点信息。

配置表分片规则文件rule.xml

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
<?xml version="1.0" encoding="UTF-8"?>
<!-- - - Licensed under the Apache License, Version 2.0 (the "License");
    - you may not use this file except in compliance with the License. - You
    may obtain a copy of the License at - - http://www.apache.org/licenses/LICENSE-2.0
    - - Unless required by applicable law or agreed to in writing, software -
    distributed under the License is distributed on an "AS IS" BASIS, - WITHOUT
    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - See the
    License for the specific language governing permissions and - limitations
    under the License. -->
<!DOCTYPE mycat:rule SYSTEM "rule.dtd">
<mycat:rule xmlns:mycat="http://io.mycat/">
 <!-- 配置数据库规则 -->
    <tableRule name="userrule">
        <rule>
            <columns>id</columns>
            <algorithm>func1</algorithm>
        </rule>
    </tableRule>
    <!-- 配置数据库test tb_category规则 -->
    <tableRule name="categoryrule">
        <rule>
            <columns>id</columns>
            <algorithm>jump-consistent-hash</algorithm>
        </rule>
    </tableRule>
    <function name="murmur"
        class="io.mycat.route.function.PartitionByMurmurHash">
        <property name="seed">0</property><!-- 默认是0 -->
        <property name="count">2</property><!-- 要分片的数据库节点数量，必须指定，否则没法分片 -->
        <property name="virtualBucketTimes">160</property><!-- 一个实际的数据库节点被映射为这么多虚拟节点，默认是160倍，也就是虚拟节点数是物理节点数的160倍 -->
        <!-- <property name="weightMapFile">weightMapFile</property> 节点的权重，没有指定权重的节点默认是1。以properties文件的格式填写，以从0开始到count-1的整数值也就是节点索引为key，以节点权重值为值。所有权重值必须是正整数，否则以1代替 -->
        <!-- <property name="bucketMapPath">/etc/mycat/bucketMapPath</property>
            用于测试时观察各物理节点与虚拟节点的分布情况，如果指定了这个属性，会把虚拟节点的murmur hash值与物理节点的映射按行输出到这个文件，没有默认值，如果不指定，就不会输出任何东西 -->
    </function>
 
    <function name="crc32slot"
             class="io.mycat.route.function.PartitionByCRC32PreSlot">
    </function>
    <function name="hash-int"
        class="io.mycat.route.function.PartitionByFileMap">
        <property name="mapFile">partition-hash-int.txt</property>
    </function>
    <function name="rang-long"
        class="io.mycat.route.function.AutoPartitionByLong">
        <property name="mapFile">autopartition-long.txt</property>
    </function>
    <function name="mod-long" class="io.mycat.route.function.PartitionByMod">
        <!-- how many data nodes -->
        <property name="count">3</property>
    </function>
 
    <function name="func1" class="io.mycat.route.function.PartitionByLong">
        <property name="partitionCount">8</property>
        <property name="partitionLength">128</property>
    </function>
    <function name="latestMonth"
        class="io.mycat.route.function.LatestMonthPartion">
        <property name="splitOneDay">24</property>
    </function>
    <function name="partbymonth"
        class="io.mycat.route.function.PartitionByMonth">
        <property name="dateFormat">yyyy-MM-dd</property>
        <property name="sBeginDate">2015-01-01</property>
    </function>
    
    <function name="rang-mod" class="io.mycat.route.function.PartitionByRangeMod">
    <property name="mapFile">partition-range-mod.txt</property>
    </function>
    
    <function name="jump-consistent-hash" class="io.mycat.route.function.PartitionByJumpConsistentHash">
        <property name="totalBuckets">3</property>
    </function>
</mycat:rule>

上述文件重点关注第一个tableRule、rule指定了分片规则在哪个表字段，algorithm指定了分片的算法，其中  func1 与文件后面function名称为func1对应，此处使用了PartitionByLong分片算法。

conf下增加sequence_conf.properties文件，其内容如下：

?
1
2
3
4
TB_USER.HISIDS=
TB_USER.MINID=1
TB_USER.MAXID=20000
TB_USER.CURID=1

主要申明了主键增长的策略。

 

四、Mycat分库分表实践测试

 

1.master节点手动创建数据库

master节点手动创建4个数据库db1，db2,db3,db4 (不要操作从节点)

此时打开slave节点，会观察到slave也会自动创建4个数据库。

Docker实现Mariadb分库分表及读写分离功能

 

2.开启mycat

使用命令 ./mycat start 开启mycat

./mycat start 启动
./mycat stop 停止 
./mycat console 前台运行 
./mycat restart 重启服务
./mycat pause 暂停 
./mycat status 查看启动状态

如果启动失败，请查看 /usr/local/mycat的wrapper.log 日志文件信息。

?
1
FATAL | wrapper | 2019/04/21 14:36:09 | ERROR: Could not write pid file /usr/local/mycat/logs/mycat.pid: No such file or directory

如果遇到上述错误，请在mycat 目录创建logs 文件夹，重新启动即可。

?
1
2
[root@localhost mycat]# bin/mycat status
Mycat-server is running (5065).

上述消息则表示mycat启动成功。

 

2.放行mycat通信端口

?
1
2
3
firewall-cmd --zone=public --add-port=8066/tcp --permanent
firewall-cmd --zone=public --add-port=9066/tcp --permanent
firewall-cmd --reload

使用docker镜像开启mycat容器实例

?
1
docker run --name mycat -v /usr/local/mycat/conf/schema.xml:/usr/local/mycat/conf/schema.xml -v /usr/local/mycat/conf/rule.xml:/usr/local/mycat/conf/rule.xml -v /usr/local/mycat/conf/server.xml:/usr/local/mycat/conf/server.xml -v /usr/local/mycat/conf/sequence_conf.properties:/usr/local/mycat/conf/sequence_conf.properties --privileged=true -p 8066:8066 -p 9066:9066 -e MYSQL_ROOT_PASSWORD=123456 -d longhronshens/mycat-docker

或者关闭防火墙。

 

3. mycat连接

使用navicate连接mycat，端口8066(9066为管理端口)

Docker实现Mariadb分库分表及读写分离功能

使用命令连接mycat

?
1
2
3
4
5
6
7
8
9
10
[root@localhost ~]# mysql -h127.0.0.1 -uroot -p123456 -P8066
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MySQL connection id is 12
Server version: 5.6.29-mycat-1.6.7.1-release-20190213150257 MyCat Server (OpenCloudDB)
 
Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.
 
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
 
MySQL [(none)]>

管理端命令：

?
1
mysql -h127.0.0.1 -uroot -proot -P9066

查看虚拟逻辑库：

?
1
2
3
4
5
6
7
8
9
MySQL [(none)]> show databases;
+----------+
| DATABASE |
+----------+
| test   |
+----------+
1 row in set (0.00 sec)
 
MySQL [(none)]>

使用逻辑库创建表：

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
MySQL [(none)]> use test;
 
CREATE TABLE `tb_user` (
 `id` bigint(20) NOT NULL AUTO_INCREMENT,
 `username` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '用户名',
 `password` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '密码，加密存储',
 `phone` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '注册手机号',
 `email` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '注册邮箱',
 `created` datetime(0) NOT NULL,
 `updated` datetime(0) NOT NULL,
 PRIMARY KEY (`id`) USING BTREE,
 UNIQUE INDEX `username`(`username`) USING BTREE,
 UNIQUE INDEX `phone`(`phone`) USING BTREE,
 UNIQUE INDEX `email`(`email`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 54 CHARACTER SET = utf8 COLLATE = utf8_general_ci COMMENT = '用户表' ROW_FORMAT = Compact;

可以看到mycat,mysql主从都创建了该表

Docker实现Mariadb分库分表及读写分离功能

在创建一张表：

?
1
2
3
4
5
6
7
8
9
CREATE TABLE `tb_category` (
 `id` varchar(5) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
 `name` varchar(200) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '名字',
 `sort_order` int(4) NOT NULL DEFAULT 1 COMMENT '排列序号，表示同级类目的展现次序，如数值相等则按名称次序排列。取值范围:大于零的整数',
 `created` datetime(0) NULL DEFAULT NULL,
 `updated` datetime(0) NULL DEFAULT NULL,
 PRIMARY KEY (`id`) USING BTREE,
 INDEX `updated`(`updated`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Compact;

插入一条数据：

?
1
INSERT INTO `tb_user`(id,username,password,phone,email,created,updated) VALUES (7, 'zhangsan', 'e10adc3949ba59abbe56e057f20f883e', '13488888888', 'aa@a', '2015-04-06 17:03:55', '2015-04-06 17:03:55');

为测试分库效果，我们插入不同ID的数据来观察一下：

?
1
2
3
4
5
INSERT INTO `tb_user`(id,username,password,phone,email,created,updated) VALUES (128, 'zhang02', 'e10adc3949ba59abbe56e057f20f88ss', '13488888882', 'aa@01.com', '2015-04-06 17:03:57', '2015-04-06 17:04:55');
 
INSERT INTO `tb_user`(id,username,password,phone,email,created,updated) VALUES (256, 'zhang03', 'e10adc3949ba59abbe56e057f20f88ss', '13488888883', 'aa@02.com', '2015-04-06 17:03:57', '2015-04-06 17:04:55');
 
INSERT INTO `tb_user`(id,username,password,phone,email,created,updated) VALUES (384, 'zhang05', 'e10adc3949ba59abbe56e057f20f88ss', '13488888885', 'aa@05.com', '2015-04-06 17:03:57', '2015-04-06 17:04:55');

可以看到数据分别分布在db1/db2/db3/db4,分布的规则取决于插入数据的主键在rule.xml 设置的分片规则约束。

查看mycat节点健康状态，在主节点输入如下命令：

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
[root@localhost ~]# mysql -h127.0.0.1 -uroot -p123456 -P9066
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MySQL connection id is 16
Server version: 5.6.29-mycat-1.6.7.1-release-20190213150257 MyCat Server (monitor)
 
Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.
 
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
 
MySQL [(none)]> show @@heartbeat;
+--------+-------+---------------+------+---------+-------+--------+---------+--------------+---------------------+-------+
| NAME  | TYPE | HOST     | PORT | RS_CODE | RETRY | STATUS | TIMEOUT | EXECUTE_TIME | LAST_ACTIVE_TIME  | STOP |
+--------+-------+---------------+------+---------+-------+--------+---------+--------------+---------------------+-------+
| hostM1 | mysql | 192.168.92.50 | 3306 |    1 |   0 | idle  |  30000 | 1,9,6    | 2019-04-21 20:44:40 | false |
| hostS2 | mysql | 192.168.92.51 | 3307 |    1 |   0 | idle  |  30000 | 1,9,67381  | 2019-04-21 20:44:40 | false |
+--------+-------+---------------+------+---------+-------+--------+---------+--------------+---------------------+-------+
2 rows in set (0.36 sec)

上述 RS_CODE 1代表节点正常，-1代表节点异常。

查询mycat所有命令：

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
MySQL [(none)]> show @@help;
+--------------------------------------------------------------+--------------------------------------------+
| STATEMENT                          | DESCRIPTION                |
+--------------------------------------------------------------+--------------------------------------------+
| show @@time.current                     | Report current timestamp          |
| show @@time.startup                     | Report startup timestamp          |
| show @@version                        | Report Mycat Server version        |
| show @@server                        | Report server status            |
| show @@threadpool                      | Report threadPool status          |
| show @@database                       | Report databases              |
| show @@datanode                       | Report dataNodes              |
| show @@datanode where schema = ?               | Report dataNodes              |
| show @@datasource                      | Report dataSources             |
| show @@datasource where dataNode = ?             | Report dataSources             |
| show @@datasource.synstatus                 | Report datasource data synchronous     |
| show @@datasource.syndetail where name=?           | Report datasource data synchronous detail |
| show @@datasource.cluster                  | Report datasource galary cluster variables |
| show @@processor                       | Report processor status          |
| show @@command                        | Report commands status           |
| show @@connection                      | Report connection status          |
| show @@cache                         | Report system cache usage         |
| show @@backend                        | Report backend connection status      |
| show @@session                        | Report front session details        |
| show @@connection.sql                    | Report connection sql           |
| show @@sql.execute                      | Report execute status           |
| show @@sql.detail where id = ?                | Report execute detail status        |
| show @@sql                          | Report SQL list              |
| show @@sql.high                       | Report Hight Frequency SQL         |
| show @@sql.slow                       | Report slow SQL              |
| show @@sql.resultset                     | Report BIG RESULTSET SQL          |
| show @@sql.sum                        | Report User RW Stat            |
| show @@sql.sum.user                     | Report User RW Stat            |
| show @@sql.sum.table                     | Report Table RW Stat           |
| show @@parser                        | Report parser status            |
| show @@router                        | Report router status            |
| show @@heartbeat                       | Report heartbeat status          |
| show @@heartbeat.detail where name=?             | Report heartbeat current detail      |
| show @@slow where schema = ?                 | Report schema slow sql           |
| show @@slow where datanode = ?                | Report datanode slow sql          |
| show @@sysparam                       | Report system param            |
| show @@syslog limit=?                    | Report system mycat.log          |
| show @@white                         | show mycat white host           |
| show @@white.set=?,?                     | set mycat white host,[ip,user]       |
| show @@directmemory=1 or 2                  | show mycat direct memory usage       |
| show @@check_global -SCHEMA= ? -TABLE=? -retry=? -interval=? | check mycat global table consistency    |
| switch @@datasource name:index                | Switch dataSource             |
| kill @@connection id1,id2,...                | Kill the specified connections       |
| stop @@heartbeat name:time                  | Pause dataNode heartbeat          |
| reload @@config                       | Reload basic config from file       |
| reload @@config_all                     | Reload all config from file        |
| reload @@route                        | Reload route config from file       |
| reload @@user                        | Reload user config from file        |
| reload @@sqlslow=                      | Set Slow SQL Time(ms)           |
| reload @@user_stat                      | Reset show @@sql @@sql.sum @@sql.slow   |
| rollback @@config                      | Rollback all config from memory      |
| rollback @@route                       | Rollback route config from memory     |
| rollback @@user                       | Rollback user config from memory      |
| reload @@sqlstat=open                    | Open real-time sql stat analyzer      |
| reload @@sqlstat=close                    | Close real-time sql stat analyzer     |
| offline                           | Change MyCat status to OFF         |
| online                            | Change MyCat status to ON         |
| clear @@slow where schema = ?                | Clear slow sql by schema          |
| clear @@slow where datanode = ?               | Clear slow sql by datanode         |
+--------------------------------------------------------------+--------------------------------------------+
59 rows in set (0.16 sec)

遇到如下错误：

Docker实现Mariadb分库分表及读写分离功能

修改schema.xml 文件属性checkSQLschema:

?
1
<schema name="test" checkSQLschema="true" sqlMaxLimit="100">

遇到如下错误：

?
1
2
3
4
5
6
7
8
9
10
jvm 1  | Caused by: io.mycat.config.util.ConfigException: org.xml.sax.SAXParseException; lineNumber: 97; columnNumber: 42; Attribute "defaultAccount" must be declared for element type "user".
jvm 1  |    at io.mycat.config.loader.xml.XMLServerLoader.load(XMLServerLoader.java:111)
jvm 1  |    at io.mycat.config.loader.xml.XMLServerLoader.<init>(XMLServerLoader.java:69)
jvm 1  |    at io.mycat.config.loader.xml.XMLConfigLoader.<init>(XMLConfigLoader.java:56)
jvm 1  |    at io.mycat.config.ConfigInitializer.<init>(ConfigInitializer.java:77)
jvm 1  |    at io.mycat.config.MycatConfig.<init>(MycatConfig.java:72)
jvm 1  |    at io.mycat.MycatServer.<init>(MycatServer.java:144)
jvm 1  |    at io.mycat.MycatServer.<clinit>(MycatServer.java:96)
jvm 1  |    ... 7 more
jvm 1  | Caused by: org.xml.sax.SAXParseException; lineNumber: 97; columnNumber: 42; Attribute "defaultAccount" must be declared for element type "user".

请修改server.xml 文件，将user模块的defaultAccount取消：

?
1
2
3
4
<user name="root" >
    <property name="password">123456</property>
    <property name="schemas">test</property>
</user>

最后放一张mycat查询结果截图：

Docker实现Mariadb分库分表及读写分离功能

 

总结

以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作具有一定的参考学习价值，谢谢大家对服务器之家的支持。

原文链接：https://juejin.im/post/5cbc6b7f518825324c44f47a

  • 读写分离
  • 分库分表
  • Docker
  • MariaDB

    • 延伸 · 阅读

    精彩推荐
    最近更新
    编辑推荐
    阅读排行
    热门标签
    443 　 2008 　 2375 　 硬件冗余技术 　 KB967723 　 AH00023 　 网站备份 　 服务器技术 　 计划任务 　 FTP 　 Server2003 　 CN2 　 专线服务器 　 香港服务器租用 　 访问速度 　 视频服务器 　 硬盘 　 无法运行 　 ARM服务器 　 Vps 　 服务器集群技术 　 DNS 　 VPS主机 　 m6米乐官方网站 　 服务器租用价格 　 服务器托管 　 服务器租用 　 服务器虚拟化 　 机架服务器 　 网站服务器搭建 　
    © 2019-2024 服务器之家(www.zzvips.com) 版权所有关于我们联系我们版权申明网站地图