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keepalived+amoeba+mysql-mmm+mysql实现mysql读写分离及高可用
最近尝试了一下mysql的读写分离和高可用的搭建。搭好之后体验了一下，效果还不错。这里跟大家分享一下。
1、首先介绍一下mysql-mmm这个工具是干嘛使的？
众所周知，mysql自身提供了AB复制。我们也可以很轻松的实现master-master双向复制，同时再为其中的一个master节点搭建一个slave库。这样就实现了master1与master2之间的双向复制，同时master1与slave1之间主从复制这样的架构。这样整个体系中就存在两个master，正常情况下只有一个master对外提供服务。如果对外提供服务的master意外宕机了，这时mysql本身并不具备failover切换的能力，这样尽管系统中还有一个正常的master节点，但应用仍不可用，这个正常的master尽管存在，但无疑是个摆设。mysql-mmm就是在这样的条件下诞生的。
Mysql-MMM是Master-Master Replication Manager for MySQL（mysql主主复制管理器）的简称，该项目来自于Google，旨在用来监控mysql主主复制和做失败转移。其原理是将真实数据库节点的IP映射为虚拟IP集，在这个虚拟的IP集中，有一个用于write的IP，多个用于read的IP，这个用于write的虚拟IP映射着数据库集群中的两台master的IP，依次来实现failover的切换，如果觉得不是很明白，没有关系，后边具体配置部分还会再做说明。
Mysql-MMM是一个开源的项目，官网：http://mysql-mmm.org
2、接着来说amoeba是个什么物件？
可能您听说过mysql-proxy，这个mysql官方维护的一个实现mysql读写分离的工具，曾经测试使用过，但没有在生产中使用。网上大家讨论比较多的是mysql-proxy的配置比较麻烦，其实不是的，但说mysql-proxy的配置的话是比较简单的，不比amoeba麻烦多少，主要是mysql-proxy自身不带有启动脚本，如果你想实现像mysql服务那样的启动方式就需要自己来编写服务脚本。这里实现mysql读写分离，使用淘宝开源出来的amoeba，amoeba是用java开发出来的一款软件，其配置文件为xml格式。选择amoeba是因为amoeba是淘宝在生产环境中使用过的，经过实践测试的，相比mysql-proxy来说，风险性要小一些。
3、最后来说keepalived
keeplived是用来实现服务的高可用的一款优秀的工具，需要说明的是keepalived会为代理的服务虚拟一个IP，用于外部访问，正常情况下，这个虚拟IP是绑定在master上的。master通过脚本来周期性判断服务是否正常运行，如果发现服务异常，就会停掉keepalived服务，这时原本绑定在master上的虚拟IP就会浮动到backup上，由于这个虚拟IP仍然存在，所以外部仍旧可以访问这个服务。
实验环境：
hadoop0.updb.com 192.168.0.100
hadoop1.updb.com 192.168.0.101
hadoop2.updb.com 192.168.0.102
hadoop3.updb.com 192.168.0.103
hadoop4.updb.com 192.168.0.104
hadoop5.updb.com 192.168.0.105
mysql 5.6
所有节点的系统均为centos，使用自带网络yum源，扩展epel源，保证你的各节点均能访问公网，因为我们的mysql-mmm和keepalived均使用epel源进行网络安装。
最终架构:
为了尽可能简洁而清楚的表达，上图中并没有显示mysql-mmm的部署规划。mysql-mmm分为monitor端和agent端，实验中在所有的mysql节点(192.168.0.102-192.168.0.105)上安装agent端，在192.168.0.101上安装monitor端。
好了，到这里相信你的心中已经有了丘壑，下面我们将一步一步来实现
1、搭建mysql集群，基本的mysql安装这里不再介绍（这里主主复制、主从复制的搭建是在全新安装的数据库的基础上，所以在设置同步参数时，binlog为mysql-bin.000001）
a、mysql 主主复制
首先停掉hadoop2、hadoop3上的mysql服务，修改配置文件，hadoop2配置如下：
[root@hadoop2 ~]# cat /etc/my.cnf [mysqld] server-id=1 log-bin=mysql-bin.log sync_binlog=1 log-slave-updates innodb_buffer_pool_size = 512M innodb_flush_log_at_trx_commit=1 sql_mode=STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION,NO_AUTO_VALUE_ON_ZERO lower_case_table_names=1 log_bin_trust_function_creators=1 character-set-server=utf8 [mysql] default-character-set=utf8
hadoop3配置文件，注意server-id不能重
[root@hadoop3 ~]# cat /etc/my.cnf [mysqld] server-id=2 log-bin=mysql-bin.log sync_binlog=1 log-slave-updates innodb_buffer_pool_size = 512M innodb_flush_log_at_trx_commit=1 sql_mode=STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION,NO_AUTO_VALUE_ON_ZERO lower_case_table_names=1 log_bin_trust_function_creators=1 character-set-server=utf8 [mysql] default-character-set=utf8
重启hadoop2、hadoop3上的mysql服务
hadoop2、hadoop3上都执行添加同步用户的操作
mysql> grant replication slave on *.* to ‘rep‘@‘192.168.0.%‘ identified by ‘123456‘;
hadoop3上设置同步参数
mysql> CHANGE MASTER TO > MASTER_HOST=‘192.168.0.102‘, > MASTER_PORT=3306, > MASTER_USER=‘rep‘, > MASTER_PASSWORD=‘123456‘, > MASTER_LOG_FILE=‘mysql-bin.000001‘, > MASTER_LOG_POS=107;
注意上面的MASTER_LOG_POS=107中的107是通过下面命令在其主库中查询的，hadoop3的主库为hadoop2
mysql> show master status; +------------------+----------+--------------+------------------+-------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set | +------------------+----------+--------------+------------------+-------------------+ | mysql-bin.000001 | 107 | | | | +------------------+----------+--------------+------------------+-------------------+ 1 row in set (0.00 sec)
设置好hadoop3的主库同步参数后，启动其slave的角色
mysql> start slave; ## 查看是否同步成功 mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 192.168.0.102 Master_User: rep Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000001 Read_Master_Log_Pos: 107 Relay_Log_File: hadoop3-relay-bin.00002 Relay_Log_Pos: 283 Relay_Master_Log_File: mysql-bin.000001 Slave_IO_Running: Yes Slave_SQL_Running: Yes
如果看到上面的最后两项都为Yes，代表同步成功。
hadoop2上设置同步参数
mysql> CHANGE MASTER TO > MASTER_HOST=‘192.168.0.103‘, > MASTER_PORT=3306, > MASTER_USER=‘rep‘, > MASTER_PASSWORD=‘123456‘, > MASTER_LOG_FILE=‘mysql-bin.000001‘, > MASTER_LOG_POS=203;
同样需要到hadoop2的主库hadoop3上去查看二进制日志的位置来确定MASTER_LOG_POS的值
mysql> show master status; +------------------+----------+--------------+------------------+-------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set | +------------------+----------+--------------+------------------+-------------------+ | mysql-bin.000001 | 203 | | | | +------------------+----------+--------------+------------------+-------------------+ 1 row in set (0.00 sec)
设置好hadoop2的主库同步参数后，启动其slave的角色
mysql> start slave; ## 查看是否同步成功 mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 192.168.0.103 Master_User: rep Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000001 Read_Master_Log_Pos: 203 Relay_Log_File: hadoop2-relay-bin.00002 Relay_Log_Pos: 190 Relay_Master_Log_File: mysql-bin.000001 Slave_IO_Running: Yes Slave_SQL_Running: Yes
如果看到上面的最后两项都为Yes，代表同步成功。至此，主主复制完成，限于篇幅，不再贴出测试结果。
b、为hadoop2搭建主从复制，slave节点为hadoop4、hadoop5
配置hadoop4的配置文件
[root@hadoop4 ~]# cat /etc/my.cnf [mysqld] server-id=3 innodb_buffer_pool_size = 512M innodb_flush_log_at_trx_commit=1 sql_mode=STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION,NO_AUTO_VALUE_ON_ZERO lower_case_table_names=1 log_bin_trust_function_creators=1 character-set-server=utf8 [mysql] default-character-set=utf8
hadoop4上设置同步参数
mysql> CHANGE MASTER TO > MASTER_HOST=‘192.168.0.102‘, > MASTER_PORT=3306, > MASTER_USER=‘rep‘, > MASTER_PASSWORD=‘123456‘, > MASTER_LOG_FILE=‘mysql-bin.000002‘, > MASTER_LOG_POS=234;
查询主库的MASTER_LOG_POS
mysql> show master status; +------------------+----------+--------------+------------------+-------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set | +------------------+----------+--------------+------------------+-------------------+ | mysql-bin.000002 | 234 | | | | +------------------+----------+--------------+------------------+-------------------+ 1 row in set (0.00 sec)
设置好hadoop4的主库同步参数后，启动slave
mysql> start slave; ## 查看是否同步成功 mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 192.168.0.102 Master_User: rep Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000002 Read_Master_Log_Pos: 234 Relay_Log_File: hadoop4-relay-bin.00001 Relay_Log_Pos: 292 Relay_Master_Log_File: mysql-bin.000002 Slave_IO_Running: Yes Slave_SQL_Running: Yes
hadoop5的配置过程与hadoop4一样，需要注意的是hadoop5配置文件中的server-id=4，不能跟其他节点重复，这里不再贴测试结果。
2、搭建mysql-mmm
首先在mysql中添加mysql-mmm访问mysql的用户，由于已经配置了主主、主从复制，所以只需要在hadoop2上进行授权即可
mysql> GRANT REPLICATION CLIENT ON *.* TO ‘mmm_monitor‘@‘192.168.0.%‘ IDENTIFIED BY ‘123456‘; mysql> GRANT SUPER, REPLICATION CLIENT, PROCESS ON *.* TO ‘mmm_agent‘@‘192.168.0.%‘ IDENTIFIED BY ‘123456‘; mysql> flush privileges;
在hadoop1-hadoop5这5个节点上安装mysql-mmm
yum install mysql-mmm* -y
在hadoop1上配置mmm_common.conf,然后将该文件拷贝到其他节点的相同位置，覆盖默认的mmm-common.conf文件
[root@hadoop1 ~]# cat /etc/mysql-mmm/mmm_common.conf active_master_role writer <host default> cluster_interface eth0 pid_path /var/run/mysql-mmm/mmm_agentd.pid bin_path /usr/libexec/mysql-mmm/ replication_user rep ## mysql中复制用的同步用户 replication_password 123456 ## mysql中复制用的同步密码 agent_user mmm_agent ## mysql中mysql-mmm的agent用户 agent_password 123456 ## mysql中mysql-mmm的agent密码 </host> <host db1> ip 192.168.0.102 mode master peer db2 </host> <host db2> ip 192.168.0.103 mode master peer db1 </host> <host db3> ip 192.168.0.104 mode slave </host> <host db4> ip 192.168.0.105 mode slave </host> ## 定义虚拟IP192.168.0.201为wirte的IP，可以看到映射的是两个master <role writer> hosts db1, db2 ips 192.168.0.201 mode exclusive </role> ## 定义虚拟IP192.168.0.202-205为read的IP，同时使用负载均衡模式 <role reader> hosts db1, db2, db3, db4 ips 192.168.0.202, 192.168.0.203, 192.168.0.204, 192.168.0.205 mode balanced </role>
将hadoop1上修改好的mmm_common.conf拷贝到其他个节点上的相同位置覆盖默认的mmm_common.conf
hadoop1上修改monitor的配置文件mmm_mon.conf
[root@hadoop1 ~]# cat /etc/mysql-mmm/mmm_mon.conf include mmm_common.conf <monitor> ip 127.0.0.1 pid_path /var/run/mysql-mmm/mmm_mond.pid bin_path /usr/libexec/mysql-mmm status_path /var/lib/mysql-mmm/mmm_mond.status ## 这里的ip填写mysql集群各节点的真实IP ping_ips 192.168.0.102,192.168.0.103,192.168.0.104,192.168.0.105 auto_set_online 60 # The kill_host_bin does not exist by default, though the monitor will # throw a warning about it missing. See the section 5.10 "Kill Host # Functionality" in the PDF documentation. # # kill_host_bin /usr/libexec/mysql-mmm/monitor/kill_host # </monitor> <host default> monitor_user mmm_monitor ##mysql中设置的mmm_monitor用户 monitor_password 123456 ##mysql中设置的mmm_monitor密码 </host> debug 0 ##如果设为1，会在启动时打印DEBUG信息，用于排障
好，monitor的配置到此结束，紧接着来配置hadoop2-hadoop5上的agent，以hadoop2为例
[root@hadoop2 ~]# cat /etc/mysql-mmm/mmm_agent.conf include mmm_common.conf # The ‘this‘ variable refers to this server. Proper operation requires # that ‘this‘ server (db1 by default), as well as all other servers, have the # proper IP addresses set in mmm_common.conf. this db1
非常的简单，只要修改最后一行，跟mmm_common.conf中的配置要一致。hadoop3中改为db2，hadoop4中改为db3，hadoop5中改为db4。
hadoop1上启动monitor
/etc/init.d/mysql-mmm-monitor start
hadoop2、hadoop3、hadoop4、hadoop5中启动agent
/etc/init.d/mysql-mmm-agent start
hadoop1上查看状态
[root@hadoop1 ~]# mmm_control show db1(192.168.0.102) master/AWAITING_RECOVERY. Roles: db2(192.168.0.103) master/AWAITING_RECOVERY. Roles: db3(192.168.0.104) slave/AWAITING_RECOVERY. Roles: db4(192.168.0.105) slave/AWAITING_RECOVERY. Roles:
第一次使用，发现是状态是等待恢复，使用命令改变状态
[root@hadoop1 ~]# mmm_control set_online db1
再次查看状态
[root@hadoop1 ~]# mmm_control show db1(192.168.0.102) master/ONLINE. Roles: reader(192.168.0.205), writer(192.168.0.201) db2(192.168.0.103) master/ONLINE. Roles: reader(192.168.0.203) db3(192.168.0.104) slave/ONLINE. Roles: reader(192.168.0.204) db4(192.168.0.105) slave/ONLINE. Roles: reader(192.168.0.202)
现在停掉hadoop2上的mysql，查看虚拟IP的浮动
[root@hadoop2 ~]# /etc/init.d/mysql stop Shutting down MySQL.... SUCCESS!
hadoop1上查看状态，发现writer绑定到了hadoop3上
[root@hadoop1 ~]# mmm_control show db1(192.168.0.102) master/HARD_OFFLINE. Roles: db2(192.168.0.103) master/ONLINE. Roles: reader(192.168.0.203), writer(192.168.0.201) db3(192.168.0.104) slave/ONLINE. Roles: reader(192.168.0.204), reader(192.168.0.205) db4(192.168.0.105) slave/ONLINE. Roles: reader(192.168.0.202)
hadoop4中查看原本与hadoop2做同步的slave现在的master是哪个？
[root@hadoop4 ~]# mysql -uroot -p -e "show slave status\G" Enter password: *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 192.168.0.103 Master_User: rep Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000004 Read_Master_Log_Pos: 120 Relay_Log_File: hadoop4-relay-bin.000002 Relay_Log_Pos: 283 Relay_Master_Log_File: mysql-bin.000004 Slave_IO_Running: Yes Slave_SQL_Running: Yes
发现原本与hadoop2同步的hadoop4和hadoop5已经自动的与hadoop3同步，是不是觉得很神奇，哈哈，我也被mysql-mmm的牛叉所震精！！！！
现在我们重启hadoop2的mysql，看hadoop1上的状态事都会改变
[root@hadoop2 ~]# /etc/init.d/mysql start Starting MySQL.. SUCCESS!
hadoop1上查看状态，hadoop2变为待恢复状态
[root@hadoop1 ~]# mmm_control show db1(192.168.0.102) master/AWAITING_RECOVERY. Roles: db2(192.168.0.103) master/ONLINE. Roles: reader(192.168.0.203), writer(192.168.0.201) db3(192.168.0.104) slave/ONLINE. Roles: reader(192.168.0.204), reader(192.168.0.205) db4(192.168.0.105) slave/ONLINE. Roles: reader(192.168.0.202)
隔一小段时间，再次查看，发现其中的一个read 虚拟IP已经浮动到hadoop2上，此时writer仍位于hadoop3上，当然slave此时会从hadoop3来同步数据。直到hadoop3上的mysql服务不可用之后，才会重新切换回与hadoop2同步。
[root@hadoop1 ~]# mmm_control show db1(192.168.0.102) master/ONLINE. Roles: reader(192.168.0.204) db2(192.168.0.103) master/ONLINE. Roles: reader(192.168.0.203), writer(192.168.0.201) db3(192.168.0.104) slave/ONLINE. Roles: reader(192.168.0.205) db4(192.168.0.105) slave/ONLINE. Roles: reader(192.168.0.202)
3、amoeba实现读写分离
在hadoop0、haoop1上安装配置amoeba
首先在hadoop0、hadoop1上安装配置jdk和mysql客户端，实验中使用jdk1.7
## 安装mysql客户端 yum install mysql -y ## 安装jdk [root@hadoop1 ~]# rpm -ivh jdk-7u60-linux-x64.rpm ## 验证jdk环境是否安装成功 [root@hadoop1 ~]# java -version java version "1.7.0_45" OpenJDK Runtime Environment (rhel-2.4.3.3.el6-x86_64 u45-b15) OpenJDK 64-Bit Server VM (build 24.45-b08, mixed mode) ## 配置环境变量 [root@hadoop1 ~]# cat .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 export JAVA_HOME=/usr/java/jdk1.7.0_60 export JRE_HOME=/usr/java/jdk1.7.0_60/jre export CLASSPATH=./:/usr/java/jdk1.7.0_60/lib:/usr/java/jdk1.7.0_60/jre/lib export PATH ## 使环境变量生效 [root@hadoop1 ~]# . .bash_profile
hadoop1上安装amoeba
[root@hadoop1 pub]# tar xf amoeba-mysql-binary-2.2.0.tar.gz -C /opt/ [root@hadoop1 pub]# cd /opt/amoeba-mysql/
将amoeba的bin命令添加到环境变量
[root@hadoop1 ~]# cat .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-mysql/bin export JAVA_HOME=/usr/java/jdk1.7.0_60 export JRE_HOME=/usr/java/jdk1.7.0_60/jre export CLASSPATH=./:/usr/java/jdk1.7.0_60/lib:/usr/java/jdk1.7.0_60/jre/lib export PATH [root@hadoop1 ~]# . .bash_profile
尝试启动amoeba，验证是否安装成功，若出现如下信息，则表明安装成功
[root@hadoop1 ~]# amoeba start log4j:WARN log4j config load completed from file:/opt/amoeba-mysql/conf/log4j.xml 2014-10-27 00:11:22,040 INFO context.MysqlRuntimeContext - Amoeba for Mysql current versoin=5.1.45-mysql-amoeba-proxy-2.2.0 log4j:WARN ip access config load completed from file:/opt/amoeba-mysql/conf/access_list.conf 2014-10-27 00:11:22,788 INFO net.ServerableConnectionManager - Amoeba Monitor Server listening on /0.0.0.0:9066. 2014-10-27 00:11:22,788 INFO net.ServerableConnectionManager - Amoeba for Mysql listening on /0.0.0.0:3306.
如出现下面的错误：
[root@hadoop1 ~]# amoeba start amoeba startThe stack size specified is too small, Specify at least 160k Error: Could not create the Java Virtual Machine. Error: A fatal exception has occurred. Program will exit.
按照下面的方法解决
[root@hadoop1 ~]# cd /opt/amoeba-mysql/bin/ [root@hadoop1 bin]# vi amoeba ## 将DEFAULT_OPTS="-server -Xms256m -Xmx256m -Xss256k"这行中的数值调大一些，我这里全部设置成256
接着开始配置amoeba
[root@hadoop1 ~]# cd /opt/amoeba-mysql/
[root@hadoop1 amoeba-mysql]# vi conf/dbServers.xml
<?xml version="1.0" encoding="gbk"?>
<!DOCTYPE amoeba:dbServers SYSTEM "dbserver.dtd">
<amoeba:dbServers xmlns:amoeba="http://amoeba.meidusa.com/">
<!--
Each dbServer needs to be configured into a Pool,
If you need to configure multiple dbServer with load balancing that can be simplified by the following configuration:
add attribute with name virtual = "true" in dbServer, but the configuration does not allow the element with name factoryConfig
such as ‘multiPool‘ dbServer
-->
<dbServer name="abstractServer" abstractive="true">
<factoryConfig class="com.meidusa.amoeba.mysql.net.MysqlServerConnectionFactory">
<property name="manager">${defaultManager}</property>
<property name="sendBufferSize">64</property>
<property name="receiveBufferSize">128</property>
<!-- mysql port -->
<property name="port">3306</property>
<!-- mysql schema -->
<!-- 实验中使用的是javashop库 -->
<property name="schema">test</property>
<!-- mysql user -->
<!-- kora用户名是用来远程连接数据库javashop用的，
需要提前在数据库中对该用户授权，在hadoop2上
授权就可以了，其他节点就会同步授权。
-->
<property name="user">kora</property>
<!-- 特别要注意这个地方，默认情况下这行是被注释掉的，会导致连接失败 -->
<property name="password">123456</property>
</factoryConfig>
<poolConfig class="com.meidusa.amoeba.net.poolable.PoolableObjectPool">
<property name="maxActive">500</property>
<property name="maxIdle">500</property>
<property name="minIdle">10</property>
<property name="minEvictableIdleTimeMillis">600000</property>
<property name="timeBetweenEvictionRunsMillis">600000</property>
<property name="testOnBorrow">true</property>
<property name="testOnReturn">true</property>
<property name="testWhileIdle">true</property>
</poolConfig>
</dbServer>
<!-- 这里的master会对外承担写入的功能 -->
<dbServer name="master" parent="abstractServer">
<factoryConfig>
<!-- 这里的IP对应mysql-mmm设置的writer的虚拟ip -->
<property name="ipAddress">192.168.0.201</property>
</factoryConfig>
</dbServer>
<dbServer name="slave1" parent="abstractServer">
<factoryConfig>
<!-- 这里的IP对应mysql-mmm设置的reader的虚拟ip中的其中一个 -->
<property name="ipAddress">192.168.0.202</property>
</factoryConfig>
</dbServer>
<dbServer name="slave2" parent="abstractServer">
<factoryConfig>
<!-- 这里的IP对应mysql-mmm设置的reader的虚拟ip中的其中一个 -->
<property name="ipAddress">192.168.0.203</property>
</factoryConfig>
</dbServer>
<dbServer name="slave3" parent="abstractServer">
<factoryConfig>
<!-- 这里的IP对应mysql-mmm设置的reader的虚拟ip中的其中一个 -->
<property name="ipAddress">192.168.0.204</property>
</factoryConfig>
</dbServer>
<dbServer name="slave4" parent="abstractServer">
<factoryConfig>
<!-- 这里的IP对应mysql-mmm设置的reader的虚拟ip中的其中一个 -->
<property name="ipAddress">192.168.0.205</property>
</factoryConfig>
</dbServer>
<!-- 这里将上面设置的slave添加到一个虚拟的组virtualslave里面，对外提供读的功能，同时实现负载均衡 -->
<dbServer name="virtualslave" virtual="true">
<poolConfig class="com.meidusa.amoeba.server.MultipleServerPool">
<!-- Load balancing strategy: 1=ROUNDROBIN , 2=WEIGHTBASED , 3=HA-->
<property name="loadbalance">1</property>
<!-- Separated by commas,such as: server1,server2,server1 -->
<property name="poolNames">slave1,slave2,slave3,slave4</property>
</poolConfig>
</dbServer>
</amoeba:dbServers>
[root@hadoop1 amoeba-mysql]# vi conf/amoeba.xml
<?xml version="1.0" encoding="gbk"?>
<!DOCTYPE amoeba:configuration SYSTEM "amoeba.dtd">
<amoeba:configuration xmlns:amoeba="http://amoeba.meidusa.com/">
<proxy>
<!-- service class must implements com.meidusa.amoeba.service.Service -->
<service name="Amoeba for Mysql" class="com.meidusa.amoeba.net.ServerableConnectionManager">
<!-- 为了方便应用程序访问，将端口改为3306 -->
<property name="port">3306</property>
<!-- 这里监听需要在0.0.0.0 -->
<property name="ipAddress">0.0.0.0</property>
<property name="manager">${clientConnectioneManager}</property>
<property name="connectionFactory">
<bean class="com.meidusa.amoeba.mysql.net.MysqlClientConnectionFactory">
<property name="sendBufferSize">128</property>
<property name="receiveBufferSize">64</property>
</bean>
</property>
<property name="authenticator">
<bean class="com.meidusa.amoeba.mysql.server.MysqlClientAuthenticator">
<!-- 这里的kora用户跟数据库的用户无关，是应用程序使用amoeba做代理
连接数据库时的用户，是amoeba的用户 -->
<property name="user">kora</property>
<property name="password">123456</property>
<property name="filter">
<bean class="com.meidusa.amoeba.server.IPAccessController">
<property name="ipFile">${amoeba.home}/conf/access_list.conf</property>
</bean>
</property>
</bean>
</property>
</service>
<!-- server class must implements com.meidusa.amoeba.service.Service -->
<service name="Amoeba Monitor Server" class="com.meidusa.amoeba.monitor.MonitorServer">
<!-- port -->
<property name="port">9066</property>
<!-- 这里也将监听在0.0.0.0 -->
<property name="ipAddress">0.0.0.0</property>
<property name="daemon">true</property>
<property name="manager">${clientConnectioneManager}</property>
<property name="connectionFactory">
<bean class="com.meidusa.amoeba.monitor.net.MonitorClientConnectionFactory"></bean>
</property>
</service>
<runtime class="com.meidusa.amoeba.mysql.context.MysqlRuntimeContext">
<!-- proxy server net IO Read thread size -->
<property name="readThreadPoolSize">20</property>
<!-- proxy server client process thread size -->
<property name="clientSideThreadPoolSize">30</property>
<!-- mysql server data packet process thread size -->
<property name="serverSideThreadPoolSize">30</property>
<!-- per connection cache prepared statement size -->
<property name="statementCacheSize">500</property>
<!-- query timeout( default: 60 second , TimeUnit:second) -->
<property name="queryTimeout">60</property>
</runtime>
</proxy>
<!--
Each ConnectionManager will start as thread
manager responsible for the Connection IO read , Death Detection
-->
<connectionManagerList>
<connectionManager name="clientConnectioneManager" class="com.meidusa.amoeba.net.MultiConnectionManagerWrapper">
<property name="subManagerClassName">com.meidusa.amoeba.net.ConnectionManager</property>
<property name="processors">5</property>
</connectionManager>
<connectionManager name="defaultManager" class="com.meidusa.amoeba.net.MultiConnectionManagerWrapper">
<property name="subManagerClassName">com.meidusa.amoeba.net.AuthingableConnectionManager</property>
<property name="processors">5</property>
</connectionManager>
</connectionManagerList>
<!-- default using file loader -->
<dbServerLoader class="com.meidusa.amoeba.context.DBServerConfigFileLoader">
<property name="configFile">${amoeba.home}/conf/dbServers.xml</property>
</dbServerLoader>
<queryRouter class="com.meidusa.amoeba.mysql.parser.MysqlQueryRouter">
<property name="ruleLoader">
<bean class="com.meidusa.amoeba.route.TableRuleFileLoader">
<property name="ruleFile">${amoeba.home}/conf/rule.xml</property>
<property name="functionFile">${amoeba.home}/conf/ruleFunctionMap.xml</property>
</bean>
</property>
<property name="sqlFunctionFile">${amoeba.home}/conf/functionMap.xml</property>
<property name="LRUMapSize">1500</property>
<!-- 这里设置默认的连接，一般设置为writer对应的dbserver -->
<property name="defaultPool">master</property>
<!-- 这里设置谁作为writer，对应dbServer.xml中的master -->
<property name="writePool">master</property>
<!-- 这里设置谁作为reader，对应dbServer.xml中的virtualslave组 -->
<property name="readPool">virtualslave</property>
<property name="needParse">true</property>
</queryRouter>
</amoeba:configuration>将hadoop1上配置好的amoeba的安装目录scp到hadoop0上，然后配置环境变量就OK了
[root@hadoop1 ~]# scp -r /opt/amoeba-mysql/ hadoop0:/opt/ root@hadoop0‘s password:
配置环境变量
[root@hadoop0 ~]# cat .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-mysql/bin export JAVA_HOME=/usr/java/jdk1.7.0_60 export JRE_HOME=/usr/java/jdk1.7.0_60/jre export CLASSPATH=./:/usr/java/jdk1.7.0_60/lib:/usr/java/jdk1.7.0_60/jre/lib export PATH
在hadoop0、hadoop1上启动amoeba
[root@hadoop1 ~]# amoeba start & [1] 17345 [root@hadoop1 ~]# log4j:WARN log4j config load completed from file:/opt/amoeba-mysql/conf/log4j.xml 2014-10-27 00:48:22,983 INFO context.MysqlRuntimeContext - Amoeba for Mysql current versoin=5.1.45-mysql-amoeba-proxy-2.2.0 log4j:WARN ip access config load completed from file:/opt/amoeba-mysql/conf/access_list.conf 2014-10-27 00:48:23,627 INFO net.ServerableConnectionManager - Amoeba Monitor Server listening on /0.0.0.0:9066. 2014-10-27 00:48:23,627 INFO net.ServerableConnectionManager - Amoeba for Mysql listening on /0.0.0.0:3306.
使用amoeba连接后端的mysql
[root@hadoop1 ~]# mysql -ukora -p -h127.0.0.1 Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 926449292 Server version: 5.1.45-mysql-amoeba-proxy-2.2.0 MySQL Enterprise Server - Advanced Edition (Commercial) Copyright (c) 2000, 2014, 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 databases; +--------------------+ | Database | +--------------------+ | information_schema | | javashop | +--------------------+ 2 rows in set (0.00 sec)
可见，amoeba工作正常，需要注意的是这里的kora用户是amoeba的用户。-h参数后面的IP为127.0.0.1，说明连接的是本机的mysql数据库，但是本机我们是没有安装mysql数据库的，只是安装了mysql的客户端，即mysql命令,但是仍然连接到了后端的mysql中去，是不是感觉很不可思议！哈哈，过程是这样的，首先用户使用mysql -u kora -p -h 127.0.0.1命令请求连接时（没有指定端口默认为3306），由于amoeba监听在0.0.0.0:3306，当然会接受这条命令的请求，于是开始和amoeba.xml文件中的登录口令做校验，发现用户名和密码与amoeba的用户名密码完全吻合，好,执行代理，代理中设置了writer的master以及reader的virtualslave，通过负载均衡，可能这时连接请求被负载到slave1上去了，slave1在dbServer.xml中设置的虚拟IP为192.168.0.202，slave1继承了abstractServer中的端口3306，用户名kora，schema javashop，密码123456，mysql客户端发出的连接请求经过amoeba代理后变成了mysql -u kora -p123456 -h 192.168.0.202 -D javashop -P 3306。由于虚拟IP192.168.0.202是在mysql-mmm中映射出来的，很自然的这条命令进入mysql-mmm中，根据配置文件的映射关系，最终转化为了mysql -u kora -p123456 -h 192.168.0.103 -D javashop -P 3306，最终成功连接上后端的数据库。
再来捋一下，mysql客户端的命令首先经过amoeba代理，然后再经过mysql-mmm代理，最终到达后端的mysql集群，这个过程其实就是真实IP->虚拟IP->真实IP的转换，只不过中间还有负载均衡。
验证amoeba实现了读写分离功能的测试办法，这里只说思路，亲测可用，这个不必担心，首先在hadoop2上创建一张表，然后插入一条数据，这时4个节点中都会存在一条记录。这时停掉hadoop4、hadoop5与hadoop2的同步，在hadoop4、hadoop5中各插入一条不一样的记录。然后打开hadoop4、hadoop5与hadoop2的同步，最终的结果是hadoop2、hadoop3中有一条一样的数据，hadoop4、hadoop5中除了含有一条与hadoop2、hadoop3一样的数据外，还有一条各自的数据，这时用amoeba连入，不停的执行select * from tab；就能看到数据的条数在不断的变化，这就说明负载均衡和读写分离已经实现。
4、keepalived实现amoeba的HA
hadoop0、hadoop1上安装keepalived
yum install keepalived -y
hadoop1作为keepalived的master，配置如下：
[root@hadoop0 ~]# vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_script check_services {
script "/opt/check_services.sh"
interval 2
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.0.206
}
track_script {
check_services
}
} check_services.sh脚本，当amoeba服务挂掉后，stop keepalived，让虚拟IP浮动到backup上
#!/bin/bash #author: kora #date: 2014-10-21 #description: check service such as amoeba # MYSQL_CLIENT=/usr/bin/mysql MYSQL_HOST=127.0.0.1 MYSQL_USER=kora MYSQL_PORT=3306 MYSQL_PASSWD=upbjsxt CHECK_TIME=3 MYSQL_OK=1 NOW=`date` STATUS=‘OK!‘ AMOEBA_STATUS=`ps -ef |grep -v "grep"|grep amoeba|wc -l` pidfile=/var/lock/subsys/`basename $0`.pid if [ -f "$pidfile" ] && [ -e /proc/`cat $pidfile` ] then exit 1 fi trap `rm -rf $pidfile; exit 0` 1 2 3 15 echo $$ > "$pidfile" if [ "$AMOEBA_STATUS" -eq 0 ] then amoeba start > /dev/null & sleep 5 fi while [ "$CHECK_TIME" -ne 0 ] do let "CHECK_TIME-=1" "$MYSQL_CLIENT" -h "$MYSQL_HOST" -u "$MYSQL_USER" -p"$MYSQL_PASSWD" -P "$MYSQL_PORT" -e "show databases;" > /dev/null 2>&1 if [ "$?" -eq 0 ] then MYSQL_OK=1 CHECK_TIME=0 else MYSQL_OK=0 fi done if [ "$MYSQL_OK" -eq 0 ] then status=‘fail!‘ /etc/init.d/keepalived stop fi echo "$NOW:$STATUS" >> ~/keepalived.log exit 0
hadoop0作为keepalived的backup，配置如下：
[root@hadoop0 ~]# vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
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 51
priority 80
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.0.206
}
}由master和backup的配置文件看出，keepalived为amoeba配置的虚拟IP为192.168.0.206，在hadoop0、hadoop1上启动keepalived
/etc/init.d/keepalived start
在hadoop1上查看虚拟IP是否绑定在了网卡上
[root@hadoop1 ~]# ip add 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:a8:50:e2 brd ff:ff:ff:ff:ff:ff inet 192.168.0.101/24 brd 192.168.0.255 scope global eth0 inet 192.168.0.206/32 scope global eth0 inet6 fe80::20c:29ff:fea8:50e2/64 scope link valid_lft forever preferred_lft forever
192.168.0.206已经绑定上来了，使用mysql客户端连接这个虚拟IP
[root@hadoop1 ~]# mysql -u kora -p -h 192.168.0.206 Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 926449292 Server version: 5.1.45-mysql-amoeba-proxy-2.2.0 MySQL Enterprise Server - Advanced Edition (Commercial) Copyright (c) 2000, 2014, 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 databases; +--------------------+ | Database | +--------------------+ | information_schema | | javashop | +--------------------+ 2 rows in set (0.01 sec)
说明keepalived已经成功代理了amoeba，验证当hadoop1上的amoeba服务挂掉后，虚拟IP是否会自动转移，amoeba是否仍能对外服务
hadoop1中的amoeba服务停掉后，虚拟ip不见了
[root@hadoop1 ~]# amoeba stop amoeba server shutting down with port=9066 [root@hadoop1 ~]# 2014-10-27 02:02:36,902 WARN net.ServerableConnectionManager - Amoeba for Mysql shutdown completed! 2014-10-27 02:02:36,903 WARN net.ServerableConnectionManager - Amoeba Monitor Server shutdown completed! [1]+ Done amoeba start [root@hadoop1 ~]# ps -ef |grep amoeba root 31419 3847 0 02:02 pts/0 00:00:00 grep amoeba [root@hadoop1 ~]# ip add 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:a8:50:e2 brd ff:ff:ff:ff:ff:ff inet 192.168.0.101/24 brd 192.168.0.255 scope global eth0 inet6 fe80::20c:29ff:fea8:50e2/64 scope link valid_lft forever preferred_lft forever
hadoop0上出现了虚拟IP 192.168.0.206
[root@hadoop0 ~]# ip add 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:74:bc:ae brd ff:ff:ff:ff:ff:ff inet 192.168.0.100/24 brd 192.168.0.255 scope global eth0 inet 192.168.0.206/32 scope global eth0 inet6 fe80::20c:29ff:fe74:bcae/64 scope link valid_lft forever preferred_lft forever
hadoop1上验证amoeba是否仍能对外服务
[root@hadoop1 ~]# ip add 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:a8:50:e2 brd ff:ff:ff:ff:ff:ff inet 192.168.0.101/24 brd 192.168.0.255 scope global eth0 inet6 fe80::20c:29ff:fea8:50e2/64 scope link valid_lft forever preferred_lft forever [root@hadoop1 ~]# mysql -u kora -p -h 192.168.0.206 Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 1877392091 Server version: 5.1.45-mysql-amoeba-proxy-2.2.0 MySQL Enterprise Server - Advanced Edition (Commercial) Copyright (c) 2000, 2014, 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 databases; +--------------------+ | Database | +--------------------+ | information_schema | | javashop | +--------------------+ 2 rows in set (0.02 sec)
ok，没有问题，在hadoop1上的amoeba服务停掉之后，应用程序不需要做任何改动，仍可以访问后台数据，至此keepalived已经实现了amoeba的HA。
写这篇博文，虽累但还是很开心，记录下了自己成长的过程，也告诉自己，要努力让坚持成为一种习惯，不早了，洗洗睡了，晚安！
本文出自 “不逼自己就不自知有多牛逼” 博客，转载请与作者联系！
keepalived+amoeba+mysql-mmm+mysql实现mysql读写分离及高可用
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