cobar实现mysql分片及分片集之内双节点之间的高可用

首先看节点规划： IP:192.168.0.99 Host:mgs02 Role：cobar IP:192.168.0.101 Host:mysql01 Role：mysql-master1 IP:192.168.0.102 Host:mysql02 Role：mysql-slave1 IP:192.168.0.103 Host:mysql03 Role：mysql-master2 IP:192.168.0.104 Host:mysql04 Role

    首先看节点规划：

        IP:192.168.0.99     Host:mgs02      Role：cobar

        IP:192.168.0.101    Host:mysql01    Role：mysql-master1

        IP:192.168.0.102    Host:mysql02    Role：mysql-slave1

        IP:192.168.0.103    Host:mysql03    Role：mysql-master2

        IP:192.168.0.104    Host:mysql04    Role：mysql-slave2

    数据库分片规划：

        lens_conf.*                 不分片，数据分布在101和102这个单片上

        lens_mobapp_trace.test表    分片，101、102为一个片，103、104为一个片

        lens_mobapp_data.emp表      分片，101、102为一个片，103、104为一个片

        lens_mobapp_data.loc表      分片，101、102为一个片，103、104为一个片

    1、cobar不支持HA下的读写分离，如果使用了HA，每个分片内的节点都可能要有数据写入，因此，应该配置双向同步，首先配置mysql-master1和mysql-slave1、mysql-master2和mysql-slave2的双向同步，这里不再详述，与单向同步的区别就是需要开启log_slave_updates参数，然后彼此设置对方为自己的主库。

    接着需要在后端的mysql要做分片的表所在库中创建一张心跳表，并插入10条数据（针对多个cobar节点，避免单条数据的锁争用；如果只有一个cobar节点的话可以只插入一条数据，这里插入10条）

## 需要在lens_conf、lens_mobapp_data、lens_mobapp_trace三个schema中执行下面语句，可以只在
## 每个分片的某一个节点上执行，另一个节点就会同步执行。
create table xdual(id int not null,gmt datetime,primary key (id));
insert into xdual values(1,now());
insert into xdual values(2,now());
insert into xdual values(3,now());
insert into xdual values(4,now());
insert into xdual values(5,now());
insert into xdual values(6,now());
insert into xdual values(7,now());
insert into xdual values(8,now());
insert into xdual values(9,now());
insert into xdual values(10,now());

    2、安装cobar

## 解压
[root@mgs02 opt]# tar xf cobar-server-1.2.7.tar.gz -C /opt/
[root@mgs02 opt]# ls cobar-server-1.2.7/
bin  conf  lib  logs

    3、配置cobar

    首先配置schema.xml

[root@mgs02 opt]# vim  cobar-server-1.2.7/conf/schema.xml 
<?xml version="1.0" encoding="UTF-8"?>
<!--
 - Copyright 1999-2012 Alibaba Group.
 -  
 - 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 cobar:schema SYSTEM "schema.dtd">
<cobar:schema xmlns:cobar="http://cobar.alibaba.com/">

  <!-- schema定义 -->
  <schema name="lens_conf" dataNode="dn_shared01[0]" />

  <schema name="lens_mobapp_data" dataNode="dn_shared01[1]" >
    <table name="test" dataNode="dn_shared01[1],dn_shared02[0]" rule="tbRule1" />
  </schema>

  <schema name="lens_mobapp_trace" dataNode="dn_shared01[2]">
    <table name="emp" dataNode="dn_shared01[2],dn_shared02[1]" rule="tbRule2" />
    <table name="loc" dataNode="dn_shared01[2],dn_shared02[1]" rule="tbRule3" />
  </schema>
  
  <!-- 数据节点定义，数据节点由数据源和其他一些参数组织而成。-->
  <dataNode name="dn_shared01">
    <property name="dataSource">
      <dataSourceRef>ds_master_shared01$0-2</dataSourceRef>
      <dataSourceRef>ds_slave_shared01$0-2</dataSourceRef>
    </property>
    <property name="poolSize">256</property>
    <property name="heartbeatSQL">update xdual set gmt=now() where id=${(1,10)}</property>
  </dataNode>

  <dataNode name="dn_shared02">
    <property name="dataSource">
      <dataSourceRef>ds_master_shared02$0-1</dataSourceRef>
      <dataSourceRef>ds_slave_shared02$0-1</dataSourceRef>
    </property>
    <property name="poolSize">256</property>
    <property name="heartbeatSQL">update xdual set gmt=now() where id=${(1,10)}</property>
  </dataNode>

  <!-- 数据源定义，数据源是一个具体的后端数据连接的表示。-->
  <dataSource name="ds_master_shared01" type="mysql">
    <property name="location">
      <location>192.168.0.101:3306/lens_conf</location>
      <location>192.168.0.101:3306/lens_mobapp_data</location>
      <location>192.168.0.101:3306/lens_mobapp_trace</location>
    </property>
    <property name="user">lens</property>
    <property name="password">123456</property>
    <property name="sqlMode">STRICT_TRANS_TABLES</property>
  </dataSource>

  <dataSource name="ds_slave_shared01" type="mysql">
    <property name="location">
      <location>192.168.0.102:3306/lens_conf</location>
      <location>192.168.0.102:3306/lens_mobapp_data</location>
      <location>192.168.0.102:3306/lens_mobapp_trace</location>
    </property>
    <property name="user">lens</property>
    <property name="password">123456</property>
    <property name="sqlMode">STRICT_TRANS_TABLES</property>
  </dataSource>

  <dataSource name="ds_master_shared02" type="mysql">
    <property name="location">
      <location>192.168.0.103:3306/lens_mobapp_data</location>
      <location>192.168.0.103:3306/lens_mobapp_trace</location>
    </property>
    <property name="user">lens</property>
    <property name="password">123456</property>
    <property name="sqlMode">STRICT_TRANS_TABLES</property>
  </dataSource>

  <dataSource name="ds_slave_shared02" type="mysql">
    <property name="location">
      <location>192.168.0.104:3306/lens_mobapp_data</location>
      <location>192.168.0.104:3306/lens_mobapp_trace</location>
    </property>
    <property name="user">lens</property>
    <property name="password">123456</property>
    <property name="sqlMode">STRICT_TRANS_TABLES</property>
  </dataSource>

</cobar:schema>

    配置rule.xml

[root@mgs02 opt]# vim cobar-server-1.2.7/conf/rule.xml   
<?xml version="1.0" encoding="UTF-8"?>
<!--
 - Copyright 1999-2012 Alibaba Group.
 -  
 - 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 cobar:rule SYSTEM "rule.dtd">
<cobar:rule xmlns:cobar="http://cobar.alibaba.com/">

  <!-- 路由规则定义，定义什么表，什么字段，采用什么路由算法 -->
  <tableRule name="tbRule1">
    <rule>
      <columns>id</columns>
      <algorithm><![CDATA[ int_2(${id}) ]]></algorithm>
    </rule>
  </tableRule>

  <tableRule name="tbRule2">
    <rule>
      <columns>empno</columns>
      <algorithm><![CDATA[ int_2(${empno}) ]]></algorithm>
    </rule>
  </tableRule>

  <tableRule name="tbRule3">
    <rule>
      <columns>addr_id</columns>
      <algorithm><![CDATA[ int_2(${addr_id}) ]]></algorithm>
    </rule>
  </tableRule>

  <!-- 路由函数定义 -->
  <function name="int_2" class="com.alibaba.cobar.route.function.PartitionByLong">
    <property name="partitionCount">2</property>
    <property name="partitionLength">512</property>
  </function>

</cobar:rule>

    配置server.xml

[root@mgs02 opt]# cat  cobar-server-1.2.7/conf/server.xml 
<?xml version="1.0" encoding="UTF-8"?>
<!--
 - Copyright 1999-2012 Alibaba Group.
 -  
 - 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 cobar:server SYSTEM "server.dtd">
<cobar:server xmlns:cobar="http://cobar.alibaba.com/">
  
  <!-- 系统参数定义，服务端口、管理端口，处理器个数、线程池等。 -->
  <system>
    <property name="serverPort">8066</property>
    <property name="managerPort">9066</property>
    <property name="initExecutor">16</property>
    <property name="timerExecutor">4</property>
    <property name="managerExecutor">4</property>
    <property name="processors">4</property>
    <property name="processorHandler">8</property>
    <property name="processorExecutor">8</property>
    <property name="clusterHeartbeatUser">_HEARTBEAT_USER_</property>
    <property name="clusterHeartbeatPass">_HEARTBEAT_PASS_</property>
  </system>

  <!-- 用户访问定义，用户名、密码、schema等信息。 -->
  <user name="lens">
    <property name="password">123456</property>
  </user>

  <!--
  <user name="root">
    <property name="password"></property>
  </user>
  -->

  <!-- 集群列表定义，指定集群节点的主机和权重，用于集群间的心跳和客户端负载均衡。 -->
  <cluster>
    <node name="cobar01">
      <property name="host">192.168.0.99</property>
      <property name="weight">1</property>
    </node>
  </cluster>
   
  <!-- 隔离区定义，可以限定某个主机上只允许某个用户登录。 -->
  <!--
  <quarantine>
    <host name="1.2.3.4">
      <property name="user">test</property>
    </host>
  </quarantine>
  -->

</cobar:server>

    4、启动cobar

[root@mgs02 opt]# cobar-server-1.2.7/bin/startup.sh 
"/usr/java/jdk1.7.0_75/bin/java" -Dcobar.home="/opt/cobar-server-1.2.7" -classpath "/opt/cobar-server-1.2.7/conf:/opt/cobar-server-1.2.7/lib/classes:/opt/cobar-server-1.2.7/lib/cobar-server-1.2.7.jar:/opt/cobar-server-1.2.7/lib/log4j-1.2.17.jar" -server -Xms1024m -Xmx1024m -Xmn256m -Xss256k -XX:+AggressiveOpts -XX:+UseBiasedLocking -XX:+UseFastAccessorMethods -XX:+DisableExplicitGC -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:+CMSParallelRemarkEnabled -XX:+UseCMSCompactAtFullCollection -XX:+UseCMSInitiatingOccupancyOnly -XX:CMSInitiatingOccupancyFraction=75 com.alibaba.cobar.CobarStartup >> "/opt/cobar-server-1.2.7/logs/console.log" 2>&1 &
[root@mgs02 opt]# ps -ef |grep cobar
root      1120     1 13 18:58 pts/0    00:00:01 /usr/java/jdk1.7.0_75/bin/java -Dcobar.home=/opt/cobar-server-1.2.7 -classpath /opt/cobar-server-1.2.7/conf:/opt/cobar-server-1.2.7/lib/classes:/opt/cobar-server-1.2.7/lib/cobar-server-1.2.7.jar:/opt/cobar-server-1.2.7/lib/log4j-1.2.17.jar -server -Xms1024m -Xmx1024m -Xmn256m -Xss256k -XX:+AggressiveOpts -XX:+UseBiasedLocking -XX:+UseFastAccessorMethods -XX:+DisableExplicitGC -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:+CMSParallelRemarkEnabled -XX:+UseCMSCompactAtFullCollection -XX:+UseCMSInitiatingOccupancyOnly -XX:CMSInitiatingOccupancyFraction=75 com.alibaba.cobar.CobarStartup
root      1165  1062  0 18:59 pts/0    00:00:00 grep cobar
[root@mgs02 opt]# netstat -alnut |grep 8066
tcp        0      0 :::8066                     :::*                        LISTEN      
tcp        0      0 ::ffff:192.168.0.99:8066    ::ffff:192.168.0.99:36721   ESTABLISHED 
tcp        0      0 ::ffff:192.168.0.99:36721   ::ffff:192.168.0.99:8066    ESTABLISHED

    5、连接cobar代理

[root@mgs02 opt]# mysql -ulens -p -h127.0.0.1 -P8066 -Dlens_mobapp_data
Enter password: 
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.1.48-cobar-1.2.7 Cobar Server (ALIBABA)

Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show tables;
+----------------------------+
| Tables_in_lens_mobapp_data |
+----------------------------+
| test                       |
| xdual                      |
+----------------------------+
2 rows in set (0.01 sec)

   6、测试分片功能

## 首先查看后端是否test表中是否有数据，如果有，清空，便于测试
[root@mgs02 opt]# mysql -ulens -p -h 192.168.0.101 -Dlens_mobapp_data
Enter password: 
mysql> show tables;
+----------------------------+
| Tables_in_lens_mobapp_data |
+----------------------------+
| test                       |
| xdual                      |
+----------------------------+
2 rows in set (0.00 sec)

mysql> truncate test;
Query OK, 0 rows affected (0.03 sec)

mysql> select * from test;
Empty set (0.00 sec)

[root@mgs02 opt]# mysql -ulens -p -h 192.168.0.103 -Dlens_mobapp_data
Enter password: 
mysql> show tables;
+----------------------------+
| Tables_in_lens_mobapp_data |
+----------------------------+
| test                       |
| xdual                      |
+----------------------------+
2 rows in set (0.00 sec)

mysql> truncate test;
Query OK, 0 rows affected (0.03 sec)

mysql> select  * from test;
Empty set (0.00 sec)

## 使用cobar代理插入数据
[root@mgs02 opt]# mysql -ulens -p -h 127.0.0.1 -P8066 -Dlens_mobapp_data
Enter password: 
mysql> insert into test(id,obj) values(1,'Linux');
Query OK, 1 row affected (0.03 sec)

mysql> insert into test(id,obj) values(1020,'Mysql');
Query OK, 1 row affected (0.02 sec)

mysql> select * from test;
+------+-------+
| id   | obj   |
+------+-------+
|    1 | Linux |
| 1020 | Mysql |
+------+-------+
2 rows in set (0.02 sec)

## 后端查看数据是否分片
[root@mgs02 opt]# mysql -ulens -p -h 192.168.0.101 -Dlens_mobapp_data   
Enter password: 
mysql> select * from test;
+------+-------+
| id   | obj   |
+------+-------+
|    1 | Linux |
+------+-------+
1 row in set (0.00 sec)

[root@mgs02 opt]# mysql -ulens -p -h 192.168.0.103 -Dlens_mobapp_data
Enter password: 
mysql> select * from test;
+------+-------+
| id   | obj   |
+------+-------+
| 1020 | Mysql |
+------+-------+
1 row in set (0.00 sec)

## 可见数据已经成功分片了

    7、测试分片内部双节点的HA

## 首先停掉101机器上的mysql服务
[root@mysql01 ~]# /etc/init.d/mysql  stop
Shutting down MySQL.......... SUCCESS! 
## 然后在cobar代理中查询id=1的记录
[root@mgs02 opt]# mysql -ulens -p -h 127.0.0.1 -P8066 -Dlens_mobapp_data   
Enter password: 
mysql> select * from test where id=1;
+------+-------+
| id   | obj   |
+------+-------+
|    1 | Linux |
+------+-------+
1 row in set (0.01 sec)
## 停掉101服务，代理中查询id=1的记录，发现仍旧可以查询，说明101、102间的HA正常
## 需要注意的是如果101恢复后，不会自动切换回101，除非102异常

    8、安装cobar-manager实现cobar的监控

## 首先下载并安装jdk
[root@mgs02 opt]# yum install jdk-7u75-linux-x64.rpm  -y
## 配置java环境变量
[root@mgs02 opt]# vim ~/.bash_profile 
# .bash_profile

# Get the aliases and functions
if [ -f ~/.bashrc ]; then
        . ~/.bashrc
fi

# User specific environment and startup programs

PATH=$PATH:$HOME/bin:/opt/amoeba/bin

export JAVA_HOME=/usr/java/jdk1.7.0_75
export JRE_HOME=/usr/java/jdk1.7.0_75/jre
export CLASSPATH=./:/usr/java/jdk1.7.0_75/lib:/usr/java/jdk1.7.0_75/jre/lib
export PATH
## 验证是否安装成功
[root@mgs02 opt]# java -version
java version "1.7.0_75"
Java(TM) SE Runtime Environment (build 1.7.0_75-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.75-b04, mixed mode)
## 安装tomcat
[root@mgs02 opt]# tar xf apache-tomcat-7.0.59.tar.gz  -C /opt/
## 将cobar-manager的war包放到tomcat容器中
[root@mgs02 opt]# cp cobar-manager-1.0.5.war /opt/apache-tomcat-7.0.59/webapps/
## 启动tomcat
[root@mgs02 opt]# /opt/apache-tomcat-7.0.59/bin/startup.sh &
## 查看tomcat是否启动成功
[root@mgs02 opt]# ps -ef |grep tomcat
root      1354     1 71 22:10 pts/1    00:00:07 /usr/java/jdk1.7.0_75/jre/bin/java -Djava.util.logging.config.file=/opt/apache-tomcat-7.0.59/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djava.endorsed.dirs=/opt/apache-tomcat-7.0.59/endorsed -classpath /opt/apache-tomcat-7.0.59/bin/bootstrap.jar:/opt/apache-tomcat-7.0.59/bin/tomcat-juli.jar -Dcatalina.base=/opt/apache-tomcat-7.0.59 -Dcatalina.home=/opt/apache-tomcat-7.0.59 -Djava.io.tmpdir=/opt/apache-tomcat-7.0.59/temp org.apache.catalina.startup.Bootstrap start
root      1374  1288  0 22:10 pts/1    00:00:00 grep tomcat
[root@mgs02 opt]# tail -f /opt/apache-tomcat-7.0.59/logs/catalina.out 
Mar 31, 2015 10:10:27 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory /opt/apache-tomcat-7.0.59/webapps/examples
Mar 31, 2015 10:10:28 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deployment of web application directory /opt/apache-tomcat-7.0.59/webapps/examples has finished in 609 ms
Mar 31, 2015 10:10:28 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-bio-8080"]
Mar 31, 2015 10:10:28 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-bio-8009"]
Mar 31, 2015 10:10:28 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 6160 ms

[root@mgs02 opt]# mkdir /home/admin/xml/ -p
[root@mgs02 opt]# cd apache-tomcat-7.0.59/webapps/cobar-manager-1.0.5/WEB-INF/classes/
[root@mgs02 classes]# cp *.xml /home/admin/xml/

## 重启tomcat，然后浏览器中访问：
## 初始登录口令:root/123456
## 登录完成后，可以进行设置，图形界面的设置很简单，不详述，附几张图：