Fabric简介
mysql fabric是oracle推出的，它可以简化管理mysql集群，提供两大特性：
1 通过故障检测和故障转移提供高可用
2 通过自动数据分片实现可扩展性
Fabric前提条件
- MySQL server 5.6.10 or later for Fabric MySQL servers.（fabric是基于mysql 5.6的新特性gtid实现的）
- MySQL server 5.6.x or later for the backing store.
- Python 2 (2.6 or later) for the
mysqlfabricutility. - A Fabric-aware connector to use Fabric in applications. Permitted connectors and versions are:
- Connector/Python 1.2.1 or later
- Connector/J 5.1.27 or later
以上都是mysql fabric官网介绍的
Fabric所需安装包
server节点：
MySQL-server-5.6.21-1.el6.x86_64 # mysql server包，安装这个包需要先卸载mysql-libs这个包
MySQL-client-5.6.21-1.el6.x86_64 # mysql client包，可以不装，没装就没有mysql命令行命令了
MySQL-shared-5.6.21-1.el6.x86_64
MySQL-shared-compat-5.6.21-1.el6.x86_64 # 卸载了mysql-libs包会有一些依赖问题，安装MySQL-shared这两个包可以解决依赖
client节点：
MySQL-client-5.6.21-1.el6.x86_64 # mysql client包，可以不装，没装就没有mysql命令行命令了
mysql-connector-python-2.0.1-1.el6.noarch # app连接fabric的驱动，跟MySQL-python这个包不一样
fabric节点：
mysql-connector-python-2.0.1-1.el6.noarch # app连接fabric的驱动，fabric节点可以不装
mysql-utilities-1.5.2-1.el6.noarch # mysqlfabric包含在这个包里
MySQL-server-5.6.21-1.el6.x86_64 # mysql server包，安装这个包需要先卸载mysql-libs这个包
MySQL-client-5.6.21-1.el6.x86_64 # mysql client包，可以不装，没装就没有mysql命令行命令了
MySQL-shared-5.6.21-1.el6.x86_64
MySQL-shared-compat-5.6.21-1.el6.x86_64 # 卸载了mysql-libs包会有一些依赖问题，安装MySQL-shared这两个包可以解决依赖
Fabric具体配置
我的环境：
linux系统 centos 6.5 x86_64
controller1 192.168.141.110 server节点
controller2 192.168.141.120 server节点
controller3 192.168.141.130 fabric节点
[[email protected] ~]# mysql -uroot -p # fabric节点需要在backing store mysql server上创建一个fabric database，这里fabric节点和backing store mysql server在同一台机器上 mysql> create user ‘fabric‘@‘localhost‘ identified by ‘fabric‘ # 连接backing store mysql server认证的用户 mysql> grant all on fabric.* to ‘fabric‘@‘localhost‘ [[email protected] ~]# mysqlfabric help commands # 显示所有的mysqlfabric命令 [[email protected] ~]# cd /etc/mysql/ # 编辑fabric.cfg配置文件 [[email protected] mysql]# cp fabric.cfg fabric.cfg.bak # 备份fabric.cfg配置文件 [[email protected] mysql]# vim fabric.cfg [DEFAULT] prefix = sysconfdir = /etc # 配置文件目录 logdir = /var/log #日志目录 [statistics] # How often the internal event log is pruned, in seconds and also the age of events in the event log that is used to present statistics. prune_time = 3600 [logging] url = file:///var/log/fabric.log level = INFO # 日志级别 [storage] auth_plugin = mysql_native_password database = fabric #连接backing store mysql server的数据库名 user = fabric # 连接backing store mysql server fabric数据库的用户名 address = localhost:3306 # backing store mysql server的地址和端口，localhost说明backing store mysql server和fabric节点在同一个机器上 connection_delay = 1 connection_timeout = 6 password = fabric # 连接backing store mysql server fabric数据库的密码 connection_attempts = 6 [failure_tracking] notification_interval = 60 notification_clients = 50 detection_timeout = 1 detection_interval = 6 notifications = 300 detections = 3 failover_interval = 0 prune_time = 3600 [servers] password = oracle # fabric节点连接mysql HAgroup中的server认证的密码 user = oracle # fabric节点连接mysql HAgroup中的server认证的用户名 unreachable_timeout = 5 [connector] ttl = 1 [client] # This section is used by the mysql client when called from MySQL Fabric and is not used MySQL Fabric. password = oracle [protocol.xmlrpc] # This section contains information about how the client connects to a MySQL Fabric node and configuration parameters for the XML-RPC protocol on the server disable_authentication = no ssl_cert = realm = MySQL Fabric ssl_key = ssl_ca = threads = 5 user = admin address = controller3:32274 password = admin [executor] # The executor executes procedures in a serial order, which guarantees that requests do not conflict. executors = 5 [sharding] # To perform operations such as moving and splitting shards, MySQL Fabric relies on the mysqldump and mysqlclient programs. prune_limit = 10000 mysqldump_program = /usr/bin/mysqldump mysqlclient_program = /usr/bin/mysql [protocol.mysql] # 官方文档上我没找到这个的解释，我想跟protocol.xmlrpc应该是一样是类似的吧 disable_authentication = no ssl_cert = ssl_key = ssl_ca = user = admin address = localhost:32275 password = admin # fabric节点的my.cnf配置文件 [[email protected] mysql]# cat /etc/my.cnf [mysqld] bind_address = localhost datadir=/var/lib/mysql collation-server = utf8_general_ci init-connect = ‘SET NAMES utf8‘ character-set-server = utf8 default-storage-engine = innodb innodb_file_per_table = 1 innodb_buffer_pool_size = 512M log_bin gtid_mode=on enforce_gtid_consistency=on log_slave_updates=1 # 初始化fabric数据库 [[email protected] mysql]# mysqlfabric manage setup --param=storage.user=fabric --param=storage.password=fabric #如果报错见下面的Trouble Shooting # 成功执行，会让你输入admin用户的密码 [[email protected]] mysqlfabric manage start --daemonize # 启动fabric管理系统 [[email protected]] mysqlfabric group create mysql_group # 创建管理组mysql_group [[email protected]] mysqlfabric group lookup_groups # 查看管理组信息 # 在每个mysql server添加到管理组mysql_group之前，需要在每个mysql server上创建授权用户 [[email protected] ~]# mysql -uroot -e "grant all on *.* to [email protected]‘%‘ identified by ‘oracle‘;" [[email protected] ~]# mysql -uroot -e "grant all on *.* to [email protected]‘%‘ identified by ‘oracle‘;" [[email protected]] mysqlfabric group add mysql_group controller1:3306 [[email protected]] mysqlfabric group add mysql_group controller2:3306 # 添加完节点后，查看组信息，两个都为secondary，记得在/etc/hosts文件写controller1、从controller2的ip映射 [[email protected]] mysqlfabric group lookup_servers mysql_group [[email protected]] mysqlfabric group health mysql_group # 这两种方式都可以查看节点状态信息 [[email protected]] mysqlfabric group promote mysql_group # promote之后，fabric会选举出一台作为primary , demote是取消primary选举 [[email protected]] mysqlfabric group activate mysql_group # 激活失败检测 [[email protected] ~]# mysqlfabric group lookup_servers mysql_group Fabric UUID: 5ca1ab1e-a007-feed-f00d-cab3fe13249e Time-To-Live: 1 server_uuid address status mode weight ------------------------------------ ---------------- --------- ---------- ------ 086193ff-4f7f-11e4-8e93-525400788967 controller2:3306 SECONDARY READ_ONLY 1.0 0c826bd0-4f8c-11e4-8ee8-5254003d38c9 controller1:3306 PRIMARY READ_WRITE 2.0
客户端通过Fabric connector连接操作就可，可是在openstack中客户端这部分连接操作的代码还没实现，还有fabric节点也要做高可用，希望oracle能尽快改进。
Trouble Shooting
1 初始化fabric数据库mysqlfabric manage setup --param=storage.user=fabric --param=storage.password=fabric执行时可能报错如下：
Error: Command (CREATE TABLE machines (machine_uuid VARCHAR(40) NOT NULL, provider_id VARCHAR(256) NOT NULL, av_zone VARCHAR(256), addresses TEXT, INDEX idx_machine_provider_id (provider_id)), ()) failed accessing (localhost:3306). 1071 (42000): Specified key was too long; max key length is 767 bytes.
原因：MySQL的varchar主键只支持不超过768个字节 或者 768/2=384个双字节 或者 768/3=256个三字节的字段 而 GBK是双字节的，UTF-8是三字节的。
参考链接：http://lsting.iteye.com/blog/707749
解决：
[[email protected] mysql]# vim /etc/my.cnf # 编辑my.cnf文件，先注释掉下面这些utf-8的配置选项,重启mysql服务，然后再去初始化fabric数据库，初始化完毕后，再去掉注释。
[mysqld] #collation-server = utf8_general_ci #init-connect = ‘SET NAMES utf8‘ #character-set-server = utf8
2 当数据库某个节点故障后重新恢复，需要先将节点变成spare，再切换为seconary，这个真让人蛋疼，没有自动恢复的机制
[[email protected]] mysqlfabric server set_status 086193ff-4f7f-11e4-8e93-525400788967 SPARE [[email protected]] mysqlfabric server set_status 086193ff-4f7f-11e4-8e93-525400788967 SECONDARY
这是fabric管理系统的server状态切换图(http://mysqlmusings.blogspot.fr/2013/10/mysql-fabric-high-availability-groups.html)，看这个应该都懂了吧！
参考链接
http://dev.mysql.com/doc/mysql-utilities/1.4/en/fabric.html
http://blog.itpub.net/25704976/viewspace-1180262
http://www.luocs.com/archives/862.html
http://www.percona.com/blog/2014/05/15/high-availability-mysql-fabric-part/