mysql+mha高可用搭建

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　　主库：172.25.254.125
　　备库：172.25.254.225
　　管理节点：172.25.254.126
　　在开始之前，请先配置好服务器间的时间同步和名称解析
　　一:在数据库节点安装mha node
　　[root@dg53 ~]# rpm -ivh epel-release-5-4.noarch.rpm
　　Retrieving epel-release-5-4.noarch.rpm

　　warning: /var/tmp/rpm-xfer.yqwfYT: Header V3 DSA signature: NOKEY, key>　　Preparing...                ########################################### [100%]
　　1:epel-release           ########################################### [100%]
　　[root@dg53 ~]# ls /etc/yum.repos.d/
　　base.repo  epel.repo  epel-testing.repo  rhel-debuginfo.repo
　　[root@dg53 ~]# yum -y install perl-DBD-MySQL  ncftp
　　[root@dg53 ~]#  wget mha4mysql-node-0.52.tar.gz -P /usr/local/src/tarbag/
　　[root@dg53 ~]# cd /usr/local/src/tarbag/
　　[root@dg53 tarbag]# tar -zxvpf mha4mysql-node-0.52.tar.gz -C ../software/
　　[root@dg53 tarbag]# cd ../software/mha4mysql-node-0.52/
　　[root@dg53 mha4mysql-node-0.52]# perl Makefile.PL
　　[root@dg53 mha4mysql-node-0.52]# make && make install
　　二：管理节点
　　1：按照步骤一安装mha node
　　2:安装mha manager
　　[root@dg55 ~]# yum -y install perl-Config-Tiny perl-Params-Validate perl-Log-Dispatch perl-Parallel-ForkManager
　　[root@dg55 ~]# wget mha4mysql-manager-0.52.tar.gz -P /usr/local/src/tarbag/
　　[root@dg55 ~]# cd /usr/local/src/tarbag/
　　[root@dg55 tarbag]# tar -zxvpf mha4mysql-manager-0.52.tar.gz -C ../software/
　　[root@dg55 tarbag]# cd ../software/mha4mysql-manager-0.52/
　　[root@dg55 mha4mysql-manager-0.52]# perl Makefile.PL
　　[root@dg55 mha4mysql-manager-0.52]# make && make install
　　3:编辑配置文件
　　[root@dg55 mha4mysql-manager-0.52]# mkdir /etc/masterha
　　[root@dg55 mha4mysql-manager-0.52]# mkdir -p /masterha/app1
　　[root@dg55 mha4mysql-manager-0.52]# cp samples/conf/* /etc/masterha/
　　[root@dg55 mha4mysql-manager-0.52]# cat /etc/masterha/app1.cnf
　　[server default]
　　manager_workdir=/masterha/app1
　　manager_log=/masterha/app1/manager.log
　　user=root
　　password=123456
　　ssh_user=root
　　repl_user=r_test
　　repl_password=123456
　　ping_interval=1
　　shutdown_script=""
　　#master_ip_failover_script="/usr/local/bin/master_ip_failover"
　　master_ip_online_change_script=""
　　report_script=""
　　[server1]
　　hostname=172.25.254.225
　　master_binlog_dir="/mydata"
　　candidate_master=1
　　[server2]
　　hostname=172.25.254.126
　　master_binlog_dir="/mydata"
　　candidate_master=1
　　4:配置manager节点和node节点以及node节点间的ssh公钥信任
　　[root@dg55 ~]# ssh-keygen -t rsa
　　[root@dg55 ~]# ssh-copy-id -i /root/.ssh/id_rsa.pub root@172.25.254.225
　　[root@dg55 ~]# ssh-copy-id -i /root/.ssh/id_rsa.pub root@172.25.254.126
　　[root@dg55 ~]# ssh 172.25.254.225 "ifconfig |grep 'inet addr' |head -1"
　　inet addr:172.25.254.225  Bcast:172.25.254.255  Mask:255.255.255.0
　　[root@dg55 ~]# ssh 172.25.254.126 "ifconfig |grep 'inet addr' |head -1"
　　inet addr:172.25.254.126  Bcast:172.25.254.255  Mask:255.255.255.0
　　5：测试ssh连接
　　[root@dg55 ~]# masterha_check_ssh --conf=/etc/masterha/app1.cnf
　　Wed Jun  6 11:11:25 2012 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
　　Wed Jun  6 11:11:25 2012 - [info] Reading application default configurations from /etc/masterha/app1.cnf..
　　Wed Jun  6 11:11:25 2012 - [info] Reading server configurations from /etc/masterha/app1.cnf..
　　Wed Jun  6 11:11:25 2012 - [info] Starting SSH connection tests..
　　Wed Jun  6 11:11:25 2012 - [debug]
　　6：测试主从复制情况，默认使用root用户连接
　　mysql> select user,host,password from mysql.user;
　　+--------+----------------+-------------------------------------------+
　　| user   | host           | password                                  |
　　+--------+----------------+-------------------------------------------+
　　| root   | localhost      |                                           |
　　| root   | dg53.yang.com  |                                           |
　　| root   | 127.0.0.1      |                                           |
　　| root   | ::1            |                                           |
　　|        | localhost      |                                           |
　　|        | dg53.yang.com  |                                           |
　　| r_test | 192.168.123.14 | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |
　　+--------+----------------+-------------------------------------------+
　　7 rows in set (0.08 sec)
　　mysql> use mysql;
　　Database changed
　　mysql> update user set host='192.168.123.%' where user='r_test';
　　Query OK, 1 row affected (0.05 sec)
　　Rows matched: 1  Changed: 1  Warnings: 0
　　mysql> commit;
　　Query OK, 0 rows affected (0.01 sec)
　　mysql> update user set host='192.168.123.%' where host='localhost' and user='root' and password='';
　　Query OK, 0 rows affected (0.00 sec)
　　Rows matched: 1  Changed: 1  Warnings: 0
　　mysql> update user set password=PASSWORD('123456') where user='root' and host='192.168.123.%';
　　Query OK, 0 rows affected (0.00 sec)
　　Rows matched: 1  Changed: 0  Warnings: 0
　　mysql> flush privileges;
　　Query OK, 0 rows affected (0.02 sec)
　　[root@dg53 ~]# whereis mysqlbinlog
　　mysqlbinlog: /usr/bin/mysqlbinlog
　　[root@dg53 ~]# mv /usr/bin/mysql* /tmp
　　[root@dg54 ~]# mv /usr/bin/mysql* /tmp
　　[root@dg53 ~]# ln -s /usr/local/mysql5.5.25/bin/* /usr/local/bin/
　　[root@dg54 ~]# ln -s /usr/local/mysql5.5.25/bin/* /usr/local/bin/
　　[root@dg55 ~]# masterha_check_repl --conf=/etc/masterha/app1.cnf
　　Wed Jun  6 12:39:03 2012 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
　　Wed Jun  6 12:39:03 2012 - [info] Reading application default configurations from /etc/masterha/app1.cnf..
　　Wed Jun  6 12:39:03 2012 - [info] Reading server configurations from /etc/masterha/app1.cnf..
　　Wed Jun  6 12:39:03 2012 - [info] MHA::MasterMonitor version 0.52.
　　Wed Jun  6 12:39:03 2012 - [info] Dead Servers:
　　Wed Jun  6 12:39:03 2012 - [info] Alive Servers:
　　Wed Jun  6 12:39:03 2012 - [info]   192.168.123.13(192.168.123.13:3306)
　　Wed Jun  6 12:39:03 2012 - [info]   192.168.123.14(192.168.123.14:3306)
　　Wed Jun  6 12:39:03 2012 - [info] Alive Slaves:
　　Wed Jun  6 12:39:03 2012 - [info]   192.168.123.14(192.168.123.14:3306)  Version=5.5.25-log (oldest major version between slaves) log-bin:enabled
　　Wed Jun  6 12:39:03 2012 - [info]     Replicating from 192.168.123.13(192.168.123.13:3306)
　　Wed Jun  6 12:39:03 2012 - [info]     Primary candidate for the new Master (candidate_master is set)
　　Wed Jun  6 12:39:03 2012 - [info] Current Alive Master: 192.168.123.13(192.168.123.13:3306)
　　Wed Jun  6 12:39:03 2012 - [info] Checking slave configurations..
　　Wed Jun  6 12:39:03 2012 - [warning]  read_only=1 is not set on slave 192.168.123.14(192.168.123.14:3306).
　　Wed Jun  6 12:39:03 2012 - [warning]  relay_log_purge=0 is not set on slave 192.168.123.14(192.168.123.14:3306).
　　Wed Jun  6 12:39:03 2012 - [info] Checking replication filtering settings..
　　Wed Jun  6 12:39:03 2012 - [info]  binlog_do_db= bbs,test, binlog_ignore_db= mysql
　　Wed Jun  6 12:39:03 2012 - [info]  Replication filtering check ok.
　　Wed Jun  6 12:39:03 2012 - [info] Starting SSH connection tests..
　　Wed Jun  6 12:39:05 2012 - [info] All SSH connection tests passed successfully.
　　Wed Jun  6 12:39:05 2012 - [info] Checking MHA Node version..
　　Wed Jun  6 12:39:05 2012 - [info]  Version check ok.
　　Wed Jun  6 12:39:05 2012 - [info] Checking SSH publickey authentication and checking recovery script configurations on the current master..
　　Wed Jun  6 12:39:05 2012 - [info]   Executing command: save_binary_logs --command=test --start_file=mysql-bin.000011 --start_pos=4 --binlog_dir=/mydata --output_file=/var/tmp/save_binary_logs_test --manager_version=0.52
　　Wed Jun  6 12:39:05 2012 - [info]   Connecting to root@172.25.254.125(172.25.254.125)..
　　Creating /var/tmp if not exists..    ok.
　　Checking output directory is accessible or not..
　　ok.
　　Binlog found at /mydata, up to mysql-bin.000011
　　Wed Jun  6 12:39:06 2012 - [info] Master setting check done.
　　Wed Jun  6 12:39:06 2012 - [info] Checking SSH publickey authentication and checking recovery script configurations on all alive slave servers..
　　Wed Jun  6 12:39:06 2012 - [info]   Executing command : apply_diff_relay_logs --command=test --slave_user=root --slave_host=172.25.254.225 --slave_ip=172.25.254.225 --slave_port=3306 --workdir=/var/tmp --target_version=5.5.25-log --manager_version=0.52 --relay_log_info=/mydata/relay-log.info  --slave_pass=xxx
　　Wed Jun  6 12:39:06 2012 - [info]   Connecting to root@172.25.254.225(172.25.254.225)..
　　Checking slave recovery environment settings..
　　Opening /mydata/relay-log.info ... ok.

　　>
　　Temporary>　　Testing mysql connection and privileges.. done.
　　Testing mysqlbinlog output.. done.
　　Cleaning up test file(s).. done.
　　Wed Jun  6 12:39:06 2012 - [info] Slaves settings check done.
　　Wed Jun  6 12:39:06 2012 - [info] Checking replication health on 172.25.254.225
　　Wed Jun  6 12:39:06 2012 - [info]  ok.
　　Wed Jun  6 12:39:06 2012 - [warning] master_ip_failover_script is not defined.
　　Wed Jun  6 12:39:06 2012 - [warning] shutdown_script is not defined.
　　Wed Jun  6 12:39:06 2012 - [info] Got exit code 0 (Not master dead).
　　MySQL Replication Health is OK.
　　7：启动管理节点进程
　　[root@dg55 ~]# nohup masterha_manager --conf=/etc/masterha/app1.cnf > /tmp/mha_manager.log  < /dev/null 2>&1 &
　　[1] 25516
　　[root@dg55 ~]# masterha_check_status --conf=/etc/masterha/app1.cnf
　　app1 (pid:25516) is running(0:PING_OK), master:172.25.254.125
　　三：测试failover过程
　　1：当前主库为172.25.254.125，关闭主库
　　mysql> show slave hosts;
　　+-----------+------+------+-----------+
　　| Server_id | Host | Port | Master_id |
　　+-----------+------+------+-----------+
　　|         2 |      | 3306 |         1 |
　　+-----------+------+------+-----------+
　　1 row in set (0.00 sec)
　　[root@dg53 ~]# service mysqld stop
　　Shutting down MySQL...[  OK  ]
　　2：在管理节点上观察日志输出
　　[root@dg55 ~]# tail -f /masterha/app1/manager.log
　　Wed Jun  6 14:50:48 2012 - [info]
　　192.168.123.13 (current master)
　　+--192.168.123.14
　　Wed Jun  6 14:50:48 2012 - [warning] master_ip_failover_script is not defined.
　　Wed Jun  6 14:50:48 2012 - [warning] shutdown_script is not defined.
　　Wed Jun  6 14:50:48 2012 - [info] Set master ping interval 1 seconds.
　　Wed Jun  6 14:50:48 2012 - [warning] secondary_check_script is not defined. It is highly recommended setting it to check master reachability from two or more routes.
　　Wed Jun  6 14:50:48 2012 - [info] Starting ping health check on 172.25.254.125(172.25.254.125:3306)..
　　Wed Jun  6 14:50:48 2012 - [info] Ping succeeded, sleeping until it doesn't respond..
　　Wed Jun  6 14:51:32 2012 - [warning] Got error on MySQL ping: 2006 (MySQL server has gone away)
　　Wed Jun  6 14:51:32 2012 - [info] HealthCheck: SSH to 172.25.254.125 is reachable.
　　Wed Jun  6 14:51:33 2012 - [warning] Got error on MySQL connect: 2013 (Lost connection to MySQL server at 'reading initial communication packet', system error: 111)
　　Wed Jun  6 14:51:33 2012 - [warning] Connection failed 1 time(s)..
　　Wed Jun  6 14:51:34 2012 - [warning] Got error on MySQL connect: 2013 (Lost connection to MySQL server at 'reading initial communication packet', system error: 111)
　　Wed Jun  6 14:51:34 2012 - [warning] Connection failed 2 time(s)..
　　Wed Jun  6 14:51:35 2012 - [warning] Got error on MySQL connect: 2013 (Lost connection to MySQL server at 'reading initial communication packet', system error: 111)
　　Wed Jun  6 14:51:35 2012 - [warning] Connection failed 3 time(s)..
　　Wed Jun  6 14:51:35 2012 - [warning] Master is not reachable from health checker!
　　Wed Jun  6 14:51:35 2012 - [warning] Master 172.25.254.125(172.25.254.125:3306) is not reachable!
　　Wed Jun  6 14:51:35 2012 - [warning] SSH is reachable.
　　Wed Jun  6 14:51:35 2012 - [info] Connecting to a master server failed. Reading configuration file /etc/masterha_default.cnf and /etc/masterha/app1.cnf again, and trying to connect to all servers to check server status..
　　Wed Jun  6 14:51:35 2012 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
　　Wed Jun  6 14:51:35 2012 - [info] Reading application default configurations from /etc/masterha/app1.cnf..
　　Wed Jun  6 14:51:35 2012 - [info] Reading server configurations from /etc/masterha/app1.cnf..
　　3：在原从库192.168.123.14上查看结果
　　mysql> show master status;
　　+------------------+----------+--------------+------------------+
　　| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
　　+------------------+----------+--------------+------------------+
　　| mysql-bin.000023 |      107 | bbs,test     | mysql            |
　　+------------------+----------+--------------+------------------+
　　1 row in set (0.00 sec)
　　mysql> show slave status\G;
　　*************************** 1. row ***************************
　　Slave_IO_State:
　　Master_Host: 172.25.254.125
　　Master_User: r_test
　　Master_Port: 3306
　　Connect_Retry: 60
　　Master_Log_File:
　　Read_Master_Log_Pos: 4
　　Relay_Log_File: dg54-relay-bin.000001

　　>
　　>　　Slave_IO_Running: No
　　Slave_SQL_Running: No
　　Replicate_Do_DB:
　　Replicate_Ignore_DB:
　　Replicate_Do_Table:
　　Replicate_Ignore_Table:
　　Replicate_Wild_Do_Table:
　　Replicate_Wild_Ignore_Table:
　　Last_Errno: 0
　　Last_Error:
　　Skip_Counter: 0
　　Exec_Master_Log_Pos: 0

　　>　　Until_Condition: None
　　Until_Log_File:
　　Until_Log_Pos: 0
　　Master_SSL_Allowed: No
　　Master_SSL_CA_File:
　　Master_SSL_CA_Path:
　　Master_SSL_Cert:
　　Master_SSL_Cipher:
　　Master_SSL_Key:
　　Seconds_Behind_Master: NULL
　　Master_SSL_Verify_Server_Cert: No
　　Last_IO_Errno: 0
　　Last_IO_Error:
　　Last_SQL_Errno: 0
　　Last_SQL_Error:
　　Replicate_Ignore_Server_Ids:
　　Master_Server_Id: 1
　　1 row in set (0.00 sec)
　　ERROR:
　　No query specified