CentOS 6.4下MySQL高可用架构MHA搭建

搭建MHA环境 https://code.google.com/p/mysql-master-ha/ //环境介绍 1.主机部署 manager机:10.10.54.154master机:10.10.54.156

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:10.10.54.157

2.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
sehll> rpm -ivh mha4mysql-node-0.53-0.noarch.rpm

2.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
shell> wget
shell> wget
shell> wget
shell> wget
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 status\G;
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