Detailed explanation of MySQL-Cluster cluster construction (based on RPM installation package dual management center)

There is no special point in the following. They are all commands that need to be executed by both servers. Since it is a dual management center configuration, in fact, the two machines have some different configurations of identification id and ip. The parameter configurations are basically the same

1. Downloadmysql-cluster 7.3.7

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

2. Environment cleaning and installation

1) Clean up the mysql service that comes with CentOS6.5. I don’t have to execute the first command. , if other systems are not possible, it is still recommended to perform

# 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 into the following 3 categories 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

首先解压MySQL-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
然后执行如下命令安装
# 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

Pay 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 in /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.
-----------------------------------------------------------

3. Configure the management node

1) Execute the following command:

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

2) Configure the config.ini file, as shown in the attachment
100.218Configuration file:

config.ini

Configuration information:

 [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
 [mgm]
 HostName=192.168.100.217
 NodeId=61
 [ndbd default]
 NoOfReplicas = 2
 DataMemory = 50M
 IndexMemory = 50M
 MaxNoOfTables = 1024
 MaxNoOfAttributes = 5000000
 MaxNoOfOrderedIndexes = 10000
 [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

100.217 configuration file
config.ini

[computer]
Id=mgr-server-02
HostName=192.168.100.217
[mgm default]
datadir=/var/lib/mysql-cluster
[mgm]
HostName=192.168.100.218
NodeId=60
[mgm]
HostName=192.168.100.217
NodeId=61
[ndbd default]
NoOfReplicas = 2
DataMemory = 50M
IndexMemory = 50M
MaxNoOfTables = 1024
MaxNoOfAttributes = 5000000
MaxNoOfOrderedIndexes = 10000
[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

In fact, there is not much difference between the two files. It lies in the name and identification id in the computer configuration

4, the configuration of SQL node and data node

Modify my .cnf file, 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=192.168.100.218,192.168.100.217
[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=192.168.100.218,192.168.100.217

5. MySQL Cluster initial startup command and user password change adjustment: (Please start in strict accordance with the order)

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 ports to be accessible, 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 (initialization needs to add --initial)
Start a balanced node command: NDBD-Intial
Start Data Node Command: MySQLD_SAFE-Defaults- File = /usr/my.cnf --explicit_defaults_for_timestamp &
my.cnf is in the etc directory in some systems
Note that you need to monitor the entire console output during the startup process and find that there are error messages It needs to be solved in time and based on the error log content.
-------------------------------------------------- -------------------------------------------------- --------
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)
id=61 @192.168.100.217 (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)
id=61 @192.168.100.217 (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 get the process ID), we can use the following command to modify it:
mysql -u root -p;
Random password (please ask for details) See the /root/.mysql_secret file to obtain). After entering, use the following command to change the password:
SET PASSWORD = PASSWORD('new password');
But this new password must be a hash value , so you need to use the following method to get the hash value of the password String
select password('111111');
However, executing the above command will make you set the password first, which is frustrating, and then come back. , then go to mysql elsewhere and execute it.
The hash value of 111111 is "*FD571203974BA9AFE270FE62151AE967ECA5E0AA"
SET PASSWORD = PASSWORD('*FD571203974BA9AFE270FE62151AE967ECA5E0AA');
Okay It’s frustrating. After setting it up, You must use ciphertext to log in. Well, just use ciphertext to enter. After entering, use the following command to force the use of clear text for login

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
Each server equipped with SQL data nodes needs to execute the above command once;

6. After the above steps are completed, test whether the cluster is working normally

1) Simple function 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, in On 217, go to mysql and check whether the database and table are automatically created. If they are created, it means success. If it fails, please check the environment configuration
2) Test whether the data can be synchronized in disaster recovery situations (one database is stopped) , will the lost data be automatically supplemented when restarting?)
Stop the mysql service on 217 and execute 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

7、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

8、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=/usr/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（极不推荐的做法）

chkconfig --level 123456 iptables off

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