搭建MHA环境https://code.google.com/p/mysql-master-ha///环境介绍
1.主机部署manager机:10.10.54.154
master机:10.10.54.156
slave1机:10.10.54.155（备用master）
slave2机:10.10.54.1572.大致步骤
A.首先用ssh-keygen实现四台主机之间相互免密钥登录
B.安装MHAmha4mysql-node，mha4mysql-manager 软件包
C.建立master，slave1，slave2之间主从复制
D.管理机manager上配置MHA文件
E.masterha_check_ssh工具验证ssh信任登录是否成功
F.masterha_check_repl工具验证mysql复制是否成功
G.启动MHA manager,并监控日志文件
H.测试master（156）宕机后，是否会自动切换//A.首先用ssh-keygen实现四台主机之间相互免密钥登录
[manager机]
1.
shell> ssh-keygen -t rsa -b 2048
shell> scp id_rsa.pub root@10.10.54.155:/root/.ssh/
shell> scp id_rsa.pub root@10.10.54.156:/root/.ssh/
shell> scp id_rsa.pub root@10.10.54.157:/root/.ssh/
2.在另外三台机子上用cat xxx >> authorized_keys导入公钥到/root/.ssh/authorized_keys文件中
3.在其它三台机子重复此步骤,使四台机子中的任何两台之间可以免密码登录//B.安装MHAmha4mysql-node，mha4mysql-manager 软件包
1.安装MHAmha4mysql-node[manager,master,slave1,slave2]
shell> yum update
shell> yum -y install perl-DBD-MySQL ncftp
shell> wget http://mysql-master-ha.googlecode.com/files/mha4mysql-node-0.53-0.noarch.rpm
sehll> rpm -ivh mha4mysql-node-0.53-0.noarch.rpm2.安装mha4mysql-manager[manager]
shell> yum install perl
shell> yum install cpan
shell> rpm -ivh mha4mysql-manager-0.53-0.el6.noarch.rpm
error:
perl（Config::Tiny） is needed by mha4mysql-manager-0.53-0.noarch
perl（Log::Dispatch） is needed by mha4mysql-manager-0.53-0.noarch
perl（Log::Dispatch::File） is needed by mha4mysql-manager-0.53-0.noarch
perl（Log::Dispatch::Screen） is needed by mha4mysql-manager-0.53-0.noarch
perl（Parallel::ForkManager） is needed by mha4mysql-manager-0.53-0.noarch
perl（Time::HiRes） is needed by mha4mysql-manager-0.53-0.noarch
[solution]
shell> wget ftp://ftp.muug.mb.ca/mirror/CentOS/5.10/os/x86_64/CentOS/perl-5.8.8-41.el5.x86_64.rpm
shell> wget ftp://ftp.muug.mb.ca/mirror/centos/6.5/os/x86_64/Packages/compat-db43-4.3.29-15.el6.x86_64.rpm
shell> wget http://downloads.naulinux.ru/pub/NauLinux/6x/i386/sites/School/RPMS/perl-Log-Dispatch-2.27-1.el6.noarch.rpm
shell> wget http://dl.Fedoraproject.org/pub/epel/6/i386/perl-Parallel-ForkManager-0.7.9-1.el6.noarch.rpm
shell> wget http://dl.fedoraproject.org/pub/epel/6/i386/perl-Mail-Sender-0.8.16-3.el6.noarch.rpm
shell> wget http://dl.fedoraproject.org/pub/epel/6/i386/perl-Mail-Sendmail-0.79-12.el6.noarch.rpm
shell> wget http://mirror.centos.org/centos/6/os/x86_64/Packages/perl-Time-HiRes-1.9721-136.el6.x86_64.rpm
shell> rpm -ivh perl-Parallel-ForkManager-0.7.9-1.el6.noarch.rpm perl-Log-Dispatch-2.27-1.el6.noarch.rpm perl-Mail-Sender-0.8.16-3.el6.noarch.rpm perl-Mail-Sendmail-0.79-12.el6.noarch.rpm perl-Time-HiRes-1.9721-136.el6.x86_64.rpm
shell> rpm -ivh mha4mysql-manager-0.53-0.el6.noarch.rpm//C.建立master，slave1，slave2之间主从复制
[master:156]
1.shell> vim /etc/my.cnf
server-id=1
log-bin=mysql-bin
binlog_format=mixed
2.mysql> GRANT ALL PRIVILEGES ON *.* TO "rep"@"10.10.54.%" IDENTIFIED BY "rep123";
mysql> flush privileges;
3.mysql> show master status;[slave1,slave2]
4.change master操作
mysql> change master to
master_host="10.10.54.156",
master_port=3306,
master_user="rep",
master_password="rep123",
master_log_file="mysql-bin.000001",
master_log_pos=112;[slave1:155]
5.mysql> GRANT ALL PRIVILEGES ON *.* TO "rep"@"10.10.54.%" IDENTIFIED BY "rep123";
##slave1机子上也要授权，因为这个是备用master[master,slave1,slave2]
6.查看主从复制是否成功的一些命令
mysql> start slave;
mysql> stop slave;
mysql> reset slave;
mysql> show slave statusG;
7.所有主机上设置复制权限帐号
mysql> GRANT ALL PRIVILEGES ON *.* TO "mha_rep"@"10.10.2.10" IDENTIFIED BY "123456";//D.管理机manager上配置MHA文件
[manager:154]
1.
shell> mkdir -p /masterha/app1
shell> mkdir /etc/masterha
shell> vim /etc/masterha/app1.cnf
[server default]
user=mha_rep ##mysql管理用戶名
password=123456
manager_workdir=/masterha/app1
manager_log=/masterha/app1/manager.log
remote_workdir=/masterha/app1
ssh_user=root #ssh免密钥登录的帐号名
repl_user=rep #mysql复制帐号，用来在主从机之间同步二进制日志等
repl_password=rep123
ping_interval=1 #ping间隔，用来检测master是否正常
[server1]
hostname=10.10.54.155
#ssh_port=9999
master_binlog_dir=/data/ndb #mysql数据库目录
candidate_master=1 #master机宕掉后,优先启用这台作为新master
[server2]
hostname=10.10.54.156
#ssh_port=9999
master_binlog_dir=/data/ndb
candidate_master=1
[server3]
hostname=10.10.54.157
#ssh_port=9999
master_binlog_dir=/data/ndb
no_master=1 #设置no_master=1使主机不能成为新master//E.masterha_check_ssh工具验证ssh信任登录是否成功
[manager:154]
shell> masterha_check_ssh --conf=/etc/masterha/app1.cnf
Sun Mar 2 17:45:38 2014 - [debug] ok.
Sun Mar 2 17:45:38 2014 - [info] All SSH connection tests passed successfully.//F.masterha_check_repl工具验证mysql复制是否成功
[manager:154]
shell> masterha_check_repl --conf=/etc/masterha/app1.cnf
---------------------------------------------------------
Sun Mar 2 13:16:57 2014 - [info] Slaves settings check done.
Sun Mar 2 13:16:57 2014 - [info]
10.10.54.156 （current master）
+--10.10.54.155
+--10.10.54.157
...
MySQL Replication Health is OK.
---------------------------------------------------------------//G.启动MHA manager,并监控日志文件[manager:154]
shell> nohup masterha_manager --conf=/etc/masterha/app1.cnf > /tmp/mha_manager.log 2>&1
shell> tail -f /masterha/app1/manager.log
---------------------------------------------------------------
10.10.54.156 （current master）
+--10.10.54.155
+--10.10.54.157
...
Sun Mar 2 13:09:25 2014 - [info] Ping（SELECT） succeeded, waiting until MySQL doesn"t respond..
-----------------------------------------------------------------
##manager.log表明MHA运行良好，正在监控master是否正常工作 MySQL 5.5部署MHA http://www.linuxidc.com/Linux/2012-06/62258.htm
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