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
[root@controller3 ~]# 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'[root@controller3 ~]# mysqlfabric help commands # 显示所有的mysqlfabric命令[root@controller3 ~]# cd /etc/mysql/ # 编辑fabric.cfg配置文件[root@controller3 mysql]# cp fabric.cfg fabric.cfg.bak # 备份fabric.cfg配置文件[root@controller3 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.loglevel = INFO # 日志级别[storage]auth_plugin = mysql_native_passworddatabase = 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 = 6password = fabric # 连接backing store mysql server fabric数据库的密码connection_attempts = 6 [failure_tracking]notification_interval = 60notification_clients = 50detection_timeout = 1detection_interval = 6notifications = 300detections = 3failover_interval = 0prune_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 serverdisable_authentication = nossl_cert = realm = MySQL Fabricssl_key = ssl_ca = threads = 5user = adminaddress = controller3:32274password = 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 = 10000mysqldump_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 = nossl_cert = ssl_key = ssl_ca = user = adminaddress = localhost:32275password = admin# fabric节点的my.cnf配置文件[root@controller3 mysql]# cat /etc/my.cnf[mysqld]bind_address = localhostdatadir=/var/lib/mysqlcollation-server = utf8_general_ciinit-connect = 'SET NAMES utf8'character-set-server = utf8default-storage-engine = innodbinnodb_file_per_table = 1innodb_buffer_pool_size = 512Mlog_bin gtid_mode=on enforce_gtid_consistency=on log_slave_updates=1# 初始化fabric数据库[root@controller3 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[root@controller3] mysqlfabric manage start --daemonize # 启动fabric管理系统[root@controller3] mysqlfabric group create mysql_group # 创建管理组mysql_group[root@controller3] 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[root@controller1 ~]# mysql -uroot -e "grant all on *.* to oracle@'%' identified by 'oracle';"[root@controller2 ~]# mysql -uroot -e "grant all on *.* to oracle@'%' identified by 'oracle';"[root@controller3] mysqlfabric group add mysql_group controller1:3306[root@controller3] 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[root@controller3] mysqlfabric group lookup_servers mysql_group[root@controller3] mysqlfabric group health mysql_group # 这两种方式都可以查看节点状态信息[root@controller3] 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[root@controller3] mysqlfabric group activate mysql_group # 激活失败检测[root@controller3 ~]# mysqlfabric group lookup_servers mysql_groupFabric UUID: 5ca1ab1e-a007-feed-f00d-cab3fe13249eTime-To-Live: 1 server_uuid address status mode weight------------------------------------ ---------------- --------- ---------- ------086193ff-4f7f-11e4-8e93-525400788967 controller2:3306 SECONDARY READ_ONLY 1.00c826bd0-4f8c-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：
解决：
[root@controller3 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
[root@controller3] mysqlfabric server set_status 086193ff-4f7f-11e4-8e93-525400788967 SPARE[root@controller3] mysqlfabric server set_status 086193ff-4f7f-11e4-8e93-525400788967 SECONDARY
这是fabric管理系统的server状态切换图()，看这个应该都懂了吧！
参考链接
