MyCAT简易入门

MyCAT是mysql中间件,前身是阿里名的Cobar,Cobar在开源了一段时间后,不了了底。于是MyCAT扛起了这给大外来,在老数额时,其要性愈发彰显。这首文章要是MyCAT的入门部署。

一、安装java

坐Mycat是用java开发的,所以待以试环境下安装java,官方建议jdk1.7与以上版本

Java Oracle官方下载地址也:

http://www.oracle.com/technetwork/java/javase/archive-139210.html

 

解压jdk-7u79-linux-x64.tar.gz文本,并配备java的环境变量

# tar xvf jdk-7u79-linux-x64.tar.gz

# mv jdk1.7.0_79/ /usr/local/

 

编辑/etc/profile文件

# vim /etc/profile  添加如下内容

export JAVA_HOME=/usr/local/jdk1.7.0_79
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

 

# source /etc/profile –使/etc/profile文件生效

# java -version

java version "1.7.0_79"
Java(TM) SE Runtime Environment (build 1.7.0_79-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.79-b02, mixed mode)

 

二、安装MySQL

MySQL官方下载地址如下:

http://dev.mysql.com/downloads/mysql/

图片 1

里有各种版本,包括RPM,二进制,源码包。

为便于起见,我此选择是RPM包

# yum install -y mysql-community-server-5.6.26-2.el5.x86_64.rpm

 

启动MySQL

# /etc/init.d/mysqld start

Starting mysqld (via systemctl):                           [  OK  ]

 

也root账户创建密码

# mysqladmin -u root password “123456”

建议吗123456,后面MyCAT配置文件schema.xml中会就此到

 

三、安装MyCAT

创造MyCAT用户并安装密码

# useradd mycat

# passwd mycat

 

解压MyCAT文件

# tar xvf Mycat-server-1.5-alpha-20151221110028-linux.tar.gz

# mv mycat/ /usr/local/

 

设置mycat目录的属主和属组

# chown -R mycat.mycat /usr/local/mycat/

 

四、测试MyCAT

第一在MySQL上创造三个数据库:db1,db2,db3。

mysql> create database db1;
Query OK, 1 row affected (0.00 sec)

mysql> create database db2;
Query OK, 1 row affected (0.00 sec)

mysql> create database db3;
Query OK, 1 row affected (0.00 sec)

 

启动mycat服务

# cd /usr/local/mycat/bin/

# ./mycat start

Starting Mycat-server...

翻开mycat服务是否启动

# ps -ef |grep mycat

root       9640   7257  0 22:47 pts/3    00:00:00 grep --color=auto mycat

并无启动

 

查阅日志

# cd /usr/local/mycat/logs/

# cat wrapper.log

STATUS | wrapper  | 2016/01/07 22:44:23 | --> Wrapper Started as Daemon
STATUS | wrapper  | 2016/01/07 22:44:23 | Launching a JVM...
ERROR  | wrapper  | 2016/01/07 22:44:25 | JVM exited while loading the application.
INFO   | jvm 1    | 2016/01/07 22:44:25 | Error: Exception thrown by the agent : java.net.MalformedURLException: Local host name unknown: java.net.UnknownHostException: MySQL-Server1: MySQL-Server1: Name or service not known
STATUS | wrapper  | 2016/01/07 22:44:29 | Launching a JVM...
ERROR  | wrapper  | 2016/01/07 22:44:29 | JVM exited while loading the application.
INFO   | jvm 2    | 2016/01/07 22:44:29 | Error: Exception thrown by the agent : java.net.MalformedURLException: Local host name unknown: java.net.UnknownHostException: MySQL-Server1: MySQL-Server1: Name or service not known
STATUS | wrapper  | 2016/01/07 22:44:34 | Launching a JVM...
ERROR  | wrapper  | 2016/01/07 22:44:34 | JVM exited while loading the application.
INFO   | jvm 3    | 2016/01/07 22:44:34 | Error: Exception thrown by the agent : java.net.MalformedURLException: Local host name unknown: java.net.UnknownHostException: MySQL-Server1: MySQL-Server1: Name or service not known
STATUS | wrapper  | 2016/01/07 22:44:38 | Launching a JVM...
ERROR  | wrapper  | 2016/01/07 22:44:38 | JVM exited while loading the application.
INFO   | jvm 4    | 2016/01/07 22:44:38 | Error: Exception thrown by the agent : java.net.MalformedURLException: Local host name unknown: java.net.UnknownHostException: MySQL-Server1: MySQL-Server1: Name or service not known
STATUS | wrapper  | 2016/01/07 22:44:42 | Launching a JVM...
ERROR  | wrapper  | 2016/01/07 22:44:43 | JVM exited while loading the application.
INFO   | jvm 5    | 2016/01/07 22:44:43 | Error: Exception thrown by the agent : java.net.MalformedURLException: Local host name unknown: java.net.UnknownHostException: MySQL-Server1: MySQL-Server1: Name or service not known
FATAL  | wrapper  | 2016/01/07 22:44:43 | There were 5 failed launches in a row, each lasting less than 300 seconds.  Giving up.
FATAL  | wrapper  | 2016/01/07 22:44:43 |   There may be a configuration problem: please check the logs.
STATUS | wrapper  | 2016/01/07 22:44:43 | <-- Wrapper Stopped

 

依据报错信息,怀疑主机名尚未绑定

修改hosts文件,绑定主机名

# vim /etc/hosts

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.244.144 MySQL-Server1

重复开动mycat服务

# cd /usr/local/mycat/bin/

# ./mycat start

这次mycat正常启动

# ps -ef |grep mycat

root      10725      1  0 22:54 ?        00:00:00 /usr/local/mycat/bin/./wrapper-linux-x86-64 /usr/local/mycat/conf/wrapper.conf wrapper.syslog.ident=mycat wrapper.pidfile=/usr/local/mycat/logs/mycat.pid wrapper.daemonize=TRUE wrapper.lockfile=/var/lock/subsys/mycat
root      10881   7257  0 22:55 pts/3    00:00:00 grep --color=auto mycat

 

脚坐Travelrecord为例,来拓展扦插,查询,路由于分析等基本操作。

率先采取mycat连接mysql数据库

# mysql -utest -ptest -h127.0.0.1 -P8066 -DTESTDB

内8066凡是mycat的监听端口,类似于mysql的3306端口,其中-u,-p,-h分别是用户称,密码及主机,-D是连接的逻辑库。

至于何以是这些,这个跟配置文件有关。

图片 2

赤部分表明连接的凡mycat。

创建Travelrecord表

create table travelrecord (id bigint not null primary key,user_id varchar(100),traveldate DATE, fee decimal,days int);

安插数据

mysql> insert into travelrecord(id,user_id,traveldate,fee,days)  values(1,'Victor',20160101,100,10);
Query OK, 1 row affected (0.00 sec)

mysql> insert into travelrecord(id,user_id,traveldate,fee,days)  values(5000001,'Job',20160102,100,10);
Query OK, 1 row affected (0.00 sec)

mysql> insert into travelrecord(id,user_id,traveldate,fee,days)  values(10000001,'Slow',20160103,100,10);
Query OK, 1 row affected (0.00 sec)

关于ID为什么获得三只价,这个与conf目录下autopartition-long.txt的概念有关,这个文件根本定义auto-sharding-long的条条框框。

# range start-end ,data node index
# K=1000,M=10000.
0-500M=0
500M-1000M=1
1000M-1500M=2

自主要是测试在id取不同距离的值时,分片的功力。

下来看望分片的效力

mysql> select * from db1.travelrecord;
+----+---------+------------+------+------+
| id | user_id | traveldate | fee  | days |
+----+---------+------------+------+------+
|  1 | Victor  | 2016-01-01 |  100 |   10 |
+----+---------+------------+------+------+
1 row in set (0.00 sec)

mysql> select * from db2.travelrecord;
+---------+---------+------------+------+------+
| id      | user_id | traveldate | fee  | days |
+---------+---------+------------+------+------+
| 5000001 | Job     | 2016-01-02 |  100 |   10 |
+---------+---------+------------+------+------+
1 row in set (0.00 sec)

mysql> select * from db3.travelrecord;
+----------+---------+------------+------+------+
| id       | user_id | traveldate | fee  | days |
+----------+---------+------------+------+------+
| 10000001 | Slow    | 2016-01-03 |  100 |   10 |
+----------+---------+------------+------+------+
1 row in set (0.00 sec)

果然是分配到三单不同之节点上了。

要想看MyCAT具体会将数据分配到谁节点上,可透过路由于分析。

语法其实十分简单,就是SQL语句前加上explain语句。

下面根据explain命令查看create语句和insert语句具体会分配到如何Datanode上。

mysql> explain create table travelrecord (id bigint not null primary key,user_id varchar(100),traveldate DATE, fee decimal,days int);
+-----------+-----------------------------------------------------------------------------------------------------------------------+
| DATA_NODE | SQL                                                                                                                   |
+-----------+-----------------------------------------------------------------------------------------------------------------------+
| dn1       | create table travelrecord (id bigint not null primary key,user_id varchar(100),traveldate DATE, fee decimal,days int) |
| dn2       | create table travelrecord (id bigint not null primary key,user_id varchar(100),traveldate DATE, fee decimal,days int) |
| dn3       | create table travelrecord (id bigint not null primary key,user_id varchar(100),traveldate DATE, fee decimal,days int) |
+-----------+-----------------------------------------------------------------------------------------------------------------------+
3 rows in set (0.00 sec)

mysql>  explain insert into travelrecord(id,user_id,traveldate,fee,days)  values(1,'Victor',20160101,100,10);
+-----------+----------------------------------------------------------------------------------------------+
| DATA_NODE | SQL                                                                                          |
+-----------+----------------------------------------------------------------------------------------------+
| dn1       | insert into travelrecord(id,user_id,traveldate,fee,days)  values(1,'Victor',20160101,100,10) |
+-----------+----------------------------------------------------------------------------------------------+
1 row in set (0.01 sec)

mysql> explain insert into travelrecord(id,user_id,traveldate,fee,days)  values(5000001,'Job',20160102,100,10);
+-----------+-------------------------------------------------------------------------------------------------+
| DATA_NODE | SQL                                                                                             |
+-----------+-------------------------------------------------------------------------------------------------+
| dn2       | insert into travelrecord(id,user_id,traveldate,fee,days)  values(5000001,'Job',20160102,100,10) |
+-----------+-------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

mysql> explain insert into travelrecord(id,user_id,traveldate,fee,days)  values(10000001,'Slow',20160103,100,10);
+-----------+---------------------------------------------------------------------------------------------------+
| DATA_NODE | SQL                                                                                               |
+-----------+---------------------------------------------------------------------------------------------------+
| dn3       | insert into travelrecord(id,user_id,traveldate,fee,days)  values(10000001,'Slow',20160103,100,10) |
+-----------+---------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

 

总结:

至于MyCAT的布置其实是异常简单的,最关键的凡轻车熟路各配备文件之条条框框。以上用户称,密码,如何分库,都是在部署文件中定义之,后续,有时光又同同样详表。

关于配置文件,conf目录下主要以下三单需要熟悉。

server.xml是Mycat服务器参数调整与用户授权的安排文件

schema.xml是逻辑库定义及阐明和分片定义之布局文件

rule.xml是分片规则的布置文件

网站地图xml地图