MYSQL MHA高可用方案安裝與維護

1.安裝部署MHA

角色	IP地址	主機名	ServerID	類型
Master	172.19.0.171	MHA1	1	寫入
Candicate master	172.19.0.172	MHA2	2	讀
Slave	172.19.0.173	MHA3	3	讀
Monitor host	172.19.0.174	MHA4		監控集羣組

增加4臺/etc/hosts

[root@MHA1 ~]# cat /etc/hosts

# Do not remove the following line, or various programs

# that require network functionality will fail.

127.0.0.1 localhost.localdomain localhost

::1 localhost6.localdomain6 localhost6

172.19.0.171 MHA1

172.19.0.172 MHA2

172.19.0.173 MHA3

172.19.0.174 MHA4

其中master對外提供服務，備選master提供讀服務,slave 也提供相關的讀服務，一旦master宕機，將會把務選master提升爲新的master,slave 指向新的master.

2.首先在 172.19.0.171, 172.19.0.172, 172.19.0.173三臺安裝好mysql軟件。

3.搭建主從複製環境

（1）在172.19.0.171上創建複製用戶：

mysql> grant replication slave on *.* to 'repl'@'172.19.0.%' identified by '123456';

Query OK, 0 rows affected (0.00 sec)

mysql> show master status;

+------------------+----------+--------------+------------------+

+------------------+----------+--------------+------------------+

| mysql-bin.000002 | 258 | | |

+------------------+----------+--------------+------------------+

1 row in set (0.00 sec)

mysql>

（2）在172.19.0.172，172.19.0.173兩臺搭建備庫

mysql> change master to master_host='172.19.0.171',master_user='repl',master_password='123456',master_log_file='mysql-bin.000002',master_log_pos=258;

Query OK, 0 rows affected (0.06 sec)

mysql> start slave;

Query OK, 0 rows affected (0.00 sec)

mysql> show slave status\G;

*************************** 1. row ***************************

Slave_IO_State: Waiting for master to send event

Master_Host: 172.19.0.171

Master_User: repl

Master_Port: 3306

Connect_Retry: 60

Master_Log_File: mysql-bin.000002

Read_Master_Log_Pos: 258

Relay_Log_File: MHA2-relay-bin.000002

Relay_Log_Pos: 253

Relay_Master_Log_File: mysql-bin.000002

Slave_IO_Running: Yes

Slave_SQL_Running: Yes

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: 258

Relay_Log_Space: 408

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: 0

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

以上說明同步成功了。

（3）slave服務器(172.19.0.172,172.19.0.173)設置read only;

mysql> set global read_only=1;

（4）設置relay log清除方式（在每個slave 下）

mysql> set global relay_log_purge=0;

(5)創建監控用戶,在172.19.0.171上執行

mysql> grant all privileges on *.* to 'root'@'172.19.0.%' identified by '123456';

（6）在172.19.0.172上創建複製用戶：

mysql> grant replication slave on *.* to 'repl'@'172.19.0.%' identified by '123456';

在每臺做以下步驟

ln -s /opt/mysql/bin/* /usr/local/bin/

4.配置ssh登錄無密碼驗證

（1）在172.19.0.171配置

[root@MHA1 ~]# ssh-keygen -t rsa

[root@MHA1 ~]# ssh-copy-id -i /root/.ssh/id_rsa.pub [email protected]

（2）在172.19.0.172配置

[root@MHA2 ~]# ssh-keygen -t rsa

[root@MHA2 ~]# ssh-copy-id -i /root/.ssh/id_rsa.pub [email protected]

（3）在172.19.0.173配置

[root@MHA3 ~]# ssh-keygen -t rsa

[root@MHA3 ~]# ssh-copy-id -i /root/.ssh/id_rsa.pub [email protected]

（4）在172.19.0.174配置

[root@MHA4 ~]# ssh-keygen -t rsa

[root@MHA4 ~]# ssh-copy-id -i /root/.ssh/id_rsa.pub [email protected]

5.安裝MHA node(在所有的MYSQL服務上安裝)

（1）在172.19.0.171, 172.19.0.172, 172.19.0.173安裝perl模塊(DBD::mysql)

安裝腳本

vi nodeinstall.sh

#!/bin/bash

wget http://xrl.us/cpanm --no-check-certificate

mv cpanm /usr/bin/

chmod 755 /usr/bin/cpanm

cat >/root/list<< EOF

install DBD::mysql

EOF

for package in `cat /root/list`

cpanm $package

done

yum -y install perl-DBD-MySQL ncftp

（2）在所有的節點上安裝mha node:

[root@MHA1 ~]# tar zxvf mha4mysql-node-0.53.tar.gz

[root@MHA1 ~]# cd mha4mysql-node-0.53

[root@MHA1 mha4mysql-node-0.53]# perl Makefile.PL

[root@MHA1 mha4mysql-node-0.53]# make

[root@MHA1 mha4mysql-node-0.53]# make install

6.安裝MHA Manger

（1）在172.19.0.174上安裝 MHA node軟件包

vi nodeinstall.sh

#!/bin/bash

wget http://xrl.us/cpanm --no-check-certificate

mv cpanm /usr/bin/

chmod 755 /usr/bin/cpanm

cat >/root/list<< EOF

install DBD::mysql

EOF

for package in `cat /root/list`

cpanm $package

done

yum -y install perl-DBD-MySQL ncftp

安裝mha node軟件包:

[root@MHA4 ~]# tar zxvf mha4mysql-node-0.53.tar.gz

[root@MHA4 ~]# cd mha4mysql-node-0.53

[root@MHA4 mha4mysql-node-0.53]# perl Makefile.PL

[root@MHA4 mha4mysql-node-0.53]# make

[root@MHA4 mha4mysql-node-0.53]# make install

（2）安裝MHA Manager軟件包

[root@MHA4 ~]# vi managerinstall.sh

#!/bin/bash

wget http://xrl.us/cpanm --no-check-certificate

mv cpanm /usr/bin/

chmod 755 /usr/bin/cpanm

cat >/root/list<< EOF

install DBD::mysql

install Config::Tiny

install Log::Dispatch

install Parallel::ForkManager

install Time::HiRes

EOF

for package in `cat /root/list`

cpanm $package

done

yum -y install perl-Config-Tiny perl-Params-Validate perl-Log-Dispatch perl-Parallel-ForkManager

yum -y install perl-DBD-MySQL perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager perl-Config-IniFiles ncftp perl-Params-Validate perl-CPAN perl-Test-Mock-LWP.noarch perl-LWP-Authen-Negotiate.noarch perl-devel

yum install perl-ExtUtils-CBuilder perl-ExtUtils-MakeMaker

[root@MHA4 ~]# tar zxvf mha4mysql-manager-0.53.tar.gz

[root@MHA4 ~]# cd mha4mysql-manager-0.53

[root@MHA4 mha4mysql-manager-0.53]# perl Makefile.PL

[root@MHA4 mha4mysql-manager-0.53]# make

[root@MHA4 mha4mysql-manager-0.53]#make install

7.配置MHA

（1）創建MHA工作目錄，並且創建相關配置文件

mkdir -p /etc/masterha/

mkdir -p /masterha/app1

vi /etc/masterha/app1.cnf

[server default]

manager_workdir=/masterha/app1

manager_log=/masterha/app1/app1.log

master_ip_failover_script=/usr/local/bin/master_ip_failover

master_ip_online_change_script=/usr/local/bin/master_ip_online_change

user=root

password=123456

ssh_user=root

repl_user=repl

repl_password=123456

ping_interval=1

remote_workdir=/tmp

report_script=/usr/local/bin/send_report

secondary_check_script=/usr/bin/masterha_secondary_check -s MHA2 -s MHA1 --user=root --master_host=MHA1 --master_ip=172.19.0.171 --master_port=3306 --password=123456

shutdown_script=""

report_script=""

[server1]

hostname=172.19.0.171

master_binlog_dir=/opt/mysql/data

candidate_master=1

[server2]

hostname=172.19.0.172

master_binlog_dir=/opt/mysql/data

candidate_master=1

check_repl_delay=0

[server3]

hostname=172.19.0.173

master_binlog_dir=/opt/mysql/data

no_master=1

（2）把腳本拷貝相關目錄

[root@MHA4 ~]# cp /root/mha4mysql-manager-0.53/samples/scripts/master_ip_failover /usr/local/bin/

[root@MHA4 ~]# cp /root/mha4mysql-manager-0.53/samples/scripts/master_ip_online_change /usr/local/bin/

[root@MHA4~]#cp /root/mha4mysql-manager-0.53/samples/scripts/send_report /usr/local/bin/

[root@MHA4~]# cp /root/mha4mysql-manager-0.53/bin/masterha_secondary_check /usr/bin/

在四臺都yum -y install perl-DBD-MySQL ncftp 防止報錯

8.檢查SSH的配置

[root@MHA4 scripts]# masterha_check_ssh --conf=/etc/masterha/app1.cnf

Wed Aug 27 09:09:28 2014 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.

Wed Aug 27 09:09:28 2014 - [info] Reading application default configurations from /etc/masterha/app1.cnf..

Wed Aug 27 09:09:28 2014 - [info] Reading server configurations from /etc/masterha/app1.cnf..

Wed Aug 27 09:09:28 2014 - [info] Starting SSH connection tests..

Wed Aug 27 09:09:29 2014 - [debug]

Wed Aug 27 09:09:28 2014 - [debug] Connecting via SSH from [email protected](172.19.0.171:22) to [email protected](172.19.0.172:22)..

Wed Aug 27 09:09:28 2014 - [debug] ok.

Wed Aug 27 09:09:28 2014 - [debug] Connecting via SSH from [email protected](172.19.0.171:22) to [email protected](172.19.0.173:22)..