Detailed code explanation of MySQL-Cluster cluster construction (based on RPM installation package)

1. Downloadmysql-cluster 7.3.7

http://dev.mysql.com/downloads/cluster/

2. Environment cleanup and installation

1) Clean up the mysql service that comes with CentOS6.5. I don’t have to execute the first command. If it doesn’t work on other systems, it is recommended to execute it

# yum -y remove mysql
# rpm -qa | grep mysql*
# rpm -e --nodeps mysql-libs-5.1.71-1.el6.x86_64

2) Environment preparation

Create folders (divided as follows 3 classes to create corresponding folders)
##

存储节点：# mkdir /var/lib/mysql/data 
管理节点：# mkdir /var/lib/mysql-cluster    SQL节点：可不用  文件夹授权
进程DIR：# mkdir /var/run/mysqld

使用如下的命令来变更权限保证可写入：
# chmod -R 1777 /var/lib/mysql
# chmod -R 1777 /var/run/mysqld
# chmod -R 1777 /var/lib/mysql-cluster

3) Install mysql-cluster

Unzip it firstMySQL-Cluster-gpl-7.4.2-1.el6.x86_64.rpm-bundle.tar

# tar xvf MySQL-Cluster-gpl-7.4.2-1.el6.x86_64.rpm-bundle.tar

Then execute the following command to install

# rpm -ivh MySQL-Cluster-server-gpl-7.3.4-1.el6.x86_64.rpm
# rpm -ivh MySQL-Cluster-client-gpl-7.3.4-1.el6.x86_64.rpm

Special attention: after the server gpl package is installed, the following prompt message will appear to remind us that the initial super account password after the entire cluster installation exists /root /.mysql_secret in this file.

---------------------------------------------------------------------------------------------------------------------
A RANDOM PASSWORD HAS BEEN SET FOR THE MySQL root USER !
 You will find that password in '/root/.mysql_secret'.
 You must change that password on your first connect,
 no other statement but 'SET PASSWORD' will be accepted.
 See the manual for the semantics of the 'password expired' flag.
 Also, the account for the anonymous user has been removed.
 In addition, you can run:
  /usr/bin/mysql_secure_installation
 which will also give you the option of removing the test database.
 This is strongly recommended for production servers.
 -----------------------------------------------------------

2. Configure the management node

1) Execute the following command:

# cd /var/lib/mysql-cluster
# vi config.ini

2) Configure the config.ini file

[computer]
 Id=mgr-server-01
 HostName=192.168.100.218
 [mgm default]
 datadir=/var/lib/mysql-cluster
 [mgm]
 HostName=192.168.100.218
 NodeId=60
 ExecuteOnComputer=mgr-server-01
 PortNumber=1186
 ArbitrationRank=2
 [ndbd default]
 NoOfReplicas=2
 DataMemory=500M
 IndexMemory=500M
 [ndbd]
 HostName=192.168.100.217
 DataDir=/var/lib/mysql
 NodeId=1
 [ndbd]
 HostName=192.168.100.218
 DataDir=/var/lib/mysql
 NodeId=2
 [mysqld]
 HostName=192.168.100.217
 NodeId=81
 [mysqld]
 HostName=192.168.100.218
 NodeId=82

3. Configuration of SQL nodes and data nodes

Modify the my.cnf file and add the following content:

[client]
 socket=/var/lib/mysql/mysql.sock
 [mysqld]
 max_connections=100
 datadir=/var/lib/mysql
 socket=/var/lib/mysql/mysql.sock
 ndbcluster
 ndb-connectstring=192.168.100.218
 [mysqld_safe]
 log-error=/var/log/mysqld.log
 #pid-file=/var/run/mysqld/mysqld.pid
 pid-file=/var/lib/mysql/mysqld.pid
 [mysql_cluster]
 ndb-connectstring=192.168.100.218

4. MySQL Cluster initial startup command and user password change adjustment: (Please strictly follow Sequential startup)

1) Start mysql-cluster
Before executing the initial startup, please confirm that the firewalls of the two machines are turned off (service iptables stop or set the firewall port to be passable. The two ports are communication port 1186 and data Port 3306)
Start the mgt console command for the first time: ndb_mgmd -f /var/lib/mysql-cluster/config.ini
Start the balancing node command:               ndbd --initial
Start the data node command:                                                                                                                                                                                                  defaults-file=/etc/my.cnf --explicit_defaults_for_timestamp &
Note that you need to monitor the entire console output during the startup process. If you find any
error messages, you need to solve them in time and solve them according to the contents of the error log. -------------------------------------------------- -------------------------------------------------- --------
If everything is normal, use the following command to open the Management console: ndb_mgm
Execute# show
Check whether each node has been fully started, as follows, each node has been connected , if there is a node that is not connected, you will see

ndb_mgm> show
Connected to Management Server at: 192.168.100.218:1186
Cluster Configuration
---------------------
[ndbd(NDB)] 2 node(s)
id=1 @192.168.100.217 (mysql-5.6.21 ndb-7.4.2, Nodegroup: 0)
id=2 @192.168.100.218 (mysql-5.6.21 ndb-7.4.2, Nodegroup: 0, *)
[ndb_mgmd(MGM)] 1 node(s)
id=60 @192.168.100.218 (mysql-5.6.21 ndb-7.4.2)
[mysqld(API)] 2 node(s)
id=81 @192.168.100.217 (mysql-5.6.21 ndb-7.4.2)
id=82 @192.168.100.218 (mysql-5.6.21 ndb-7.4.2)

If there is a node that is not connected, as shown below, a line with id=81 means there is no connection, check the fault point

ndb_mgm> show
Cluster Configuration
--------------------
[ndbd(NDB)] 2 node(s)
id=1 @192.168.100.217 (mysql-5.6.21 ndb-7.4.2, Nodegroup: 0)
id=2 @192.168.100.218 (mysql-5.6.21 ndb-7.4.2, Nodegroup: 0, *)
[ndb_mgmd(MGM)] 1 node(s)
id=60 @192.168.100.218 (mysql-5.6.21 ndb-7.4.2)
[mysqld(API)] 2 node(s)
id=81 (not connected, accepting connect from 192.168.100.217)
id=82 @192.168.100.218 (mysql-5.6.21 ndb-7.4.2)

2) Change the password

When mysqld starts normally (you can use pgrep mysqld to obtain the process ID), we can use the following command to modify:

mysql -u root -p;

Random password (see /root for details) /.mysql_secret file), use the following command to change the password after entering:

SET PASSWORD = PASSWORD('新密码');

But this new password must be a

hash value, so use the following method to obtain the passwordThe hash value of string

select password('111111')；

However, executing the above command will ask you to set a password first. Depressed, it comes back again, so go to mysql elsewhere and execute it# The hash value of ##111111 is "*FD571203974BA9AFE270FE62151AE967ECA5E0AA"

SET PASSWORD = PASSWORD('*FD571203974BA9AFE270FE62151AE967ECA5E0AA');
It’s so depressing. After setting it up, you still have to use ciphertext for login, okay? Just use password After entering, use the following command to force the use of clear text to log in

use mysql;
delete from user;
grant all on *.* to root@'%' identified by "111111" with grant option;
flush privileges;
quit;

Then, you can use the clear text password to log in

Several servers equipped with SQL data nodes need to execute the above command. ;

5. After the above steps are completed, test whether the cluster is working normally
1) Simple functional test
After entering mysql on 218, execute the following:

create database clustertest;
use clustertest; 
CREATE TABLE testtable(Count INT) ENGINE=NDBCLUSTER;

Note: ENGINE=NDBCLUSTER; The engine must use NDBCLUSTER to synchronize, otherwise the synchronization will not be performed.

Check whether it is successful. On 217, go to mysql and check whether the database and table are automatically created. If they are created, it means success. If Failed, please check the environment configuration

2) Test whether the data can be synchronized in disaster recovery situations (if a database is stopped, will the lost data be automatically replenished when it is restarted)
Stop 217 mysql service, executed on 218

insert into testtable values (1);

启动217的mysql服务，使用show确认217的数据库节点已经连接上了，执行如下语句

select * from testtable;

如果发现有数据，则表示功能完备
6、关闭Cluster：（需要严格按照次序执行）
关闭数据节点：# mysqld stop  (SQL节点可以用mysqladmin shutdown或别的方式关闭。)
在管理节点上执行：# ndb_mgm -e shutdown
将安全的关闭管理节点和数据节点。
关闭后使用如下的进程检测命令查看一下是否退出来了：

# pgrep mysqld
# ps aux | grep nbdb

如果没有，找到对应的pid进行kill 操作即可
kill -9 进程号
7、再次启动Cluster方案：
启动整个cluster的次序，注意，一些语句已经减去了初始化的内容：

ndb_mgmd -f /var/lib/mysql-cluster/config.ini
ndbd
mysqld_safe --defaults-file=/etc/my.cnf --explicit_defaults_for_timestamp &

备注：
1、mysql安装后，默认会自动启动的，每次启动cluster的时候，都需要先把mysql的服务关闭，太麻烦，于是可以执行如下命令（我出手有点狠）：
    chkconfig --level 123456 mysql off
2、防火墙问题，偷个懒，我懒得去一一开放端口，干脆把防火墙直接关了
    chkconfig --level 123456 mysql off

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