Linux (centos7.9) installation and deployment of MySQL Cluster 7.6

Catalog

1. Download installation package

2. Basic cluster configuration

3. Install management node （192.168.17.81）

3.1 Installation preparation

3.2 Configuration information

4. Installing data nodes and sql node （192.168.17.83）

4.1 Installation preparation

4.2  Install the data node

4.3  install sql node

5. Installing data nodes and sql node （192.168.17.85）

5.1 Installation preparation

5.2  Install the data node

5.3  install sql node

6. Start the cluster and perform the test

6.1 Start the test

6.2 Create database test

6.3 Create table tests

6.4 Add data tests

7. Problems encountered during installation and deployment and solutions

7.1 The firewall blocks the communication between the data node and the management node

7.2  The firewall blocked sql Communication between the node and the management node

7.3 sql After the node is started , Password reset required

7.4 mysql Remote access authorization

7.5 Directory does not exist or does not have permission

---

mysql-cluster（ colony ） Provide multi node read / write capability , For an application scenario with a large number of read and write requests , Select cluster deployment , It has obvious advantages over single node deployment , In particular, read / write requests will increase with the development of the business , Even more so , At the beginning , When the read / write request is not very large , You can use two nodes , When read / write requests increase , Nodes can be added to meet business requirements .

1. Download installation package

Download address ：

MySQL :: Download MySQL Cluster

​

Download here 64 Bit compressed version .

2. Basic cluster configuration

operating system ：CentOS Linux release 7.9

Package name ：mysql-cluster-gpl-7.6.22-linux-glibc2.12-x86_64.tar.gz

The management node ：192.168.17.81

Data nodes and sql node ：192.168.17.83

Data nodes and sql node ：192.168.17.85

3. Install management node （192.168.17.81）

3.1 Installation preparation

Upload the installation package to linux, Do the following .

groupadd mysql
useradd mysql -g mysql

tar xvf mysql-cluster-gpl-7.6.22-linux-glibc2.12-x86_64.tar.gz 

mv mysql-cluster-gpl-7.6.22-linux-glibc2.12-x86_64 /usr/local/mysql

3.2 Configuration information

establish mysql-cluster Catalog , And configuration config.ini

mkdir -p /apps/mysql/mysql-cluster

cd /apps/mysql/mysql-cluster

vi config.ini

Profile contents ：

[ndbd default]
NoOfReplicas=2
DataMemory=500M
IndexMemory=300M

[ndb_mgmd]
NodeId=11
hostname=192.168.17.81
datadir=/apps/mysql/mysql-cluster

[ndbd]
NodeId=12
hostname=192.168.17.83
datadir=/apps/mysql/data

[ndbd]
NodeId=22
hostname=192.168.17.85
datadir=/apps/mysql/data

[mysqld]
NodeId=13
hostname=192.168.17.83

[mysqld]
NodeId=23
hostname=192.168.17.85

Management node initialization ： 

./ndb_mgmd -f /apps/mysql/mysql-cluster/config.ini --initial

View information from the management node ： 

# ./ndb_mgm -e show
Connected to Management Server at: localhost:1186
Cluster Configuration
---------------------
[ndbd(NDB)]     2 node(s)
id=12 (not connected, accepting connect from 192.168.17.83)
id=22 (not connected, accepting connect from 192.168.17.85)

[ndb_mgmd(MGM)] 1 node(s)
id=11   @192.168.17.81  (mysql-5.7.38 ndb-7.6.22)

[mysqld(API)]   2 node(s)
id=13 (not connected, accepting connect from 192.168.17.83)
id=23 (not connected, accepting connect from 192.168.17.85)

4. Installing data nodes and sql node （192.168.17.83）

stay 192.168.17.83 Deploy data nodes and sql node ：

4.1 Installation preparation

Upload the installation package to linux, Do the following .

groupadd mysql
useradd mysql -g mysql

tar xvf mysql-cluster-gpl-7.6.22-linux-glibc2.12-x86_64.tar.gz 

mv mysql-cluster-gpl-7.6.22-linux-glibc2.12-x86_64 /usr/local/mysql

4.2  Install the data node

vi /etc/my.cnf

The contents are as follows ：

#  Data node configuration 
[myqld]
basedir=/usr/local/mysql
datadir=/apps/mysql/data/ndbdata
user=mysql
socket=/apps/mysql/data/ndbsock/mysql.sock

symbolic-links=0

[mysql_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

[mysql_cluster]
ndb-connectstring=192.168.17.81

Initialize and start ndb node ：

./ndbd --initial
2022-06-21 16:44:09 [ndbd] INFO     -- Angel connected to '192.168.17.81:1186'
2022-06-21 16:44:09 [ndbd] INFO     -- Angel allocated nodeid: 12

  You can see ndb The node is connected to the cluster .

4.3  install sql node

The configuration file my.cnf

# SQL Node configuration 
[client]
socket=/apps/mysql/data/sqlsock/mysql.sock

[mysqld]
ndbcluster
datadir=/apps/mysql/data/sqldata
socket=/apps/mysql/data/sqlsock/mysql.sock
ndb-connectstring=192.168.17.81

[mysql_cluster]
ndb-connectstring=192.168.17.81

initialization mysql

# ./mysqld --user=root --initialize
2022-06-21T08:46:45.758523Z 0 [Warning] Ignoring user change to 'root' because the user was set to 'mysql' earlier on the command line

2022-06-21T08:46:45.765892Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2022-06-21T08:46:45.765987Z 0 [ERROR] Can't find error-message file '/apps/mysql/data/share/errmsg.sys'. Check error-message file location and 'lc-messages-dir' configuration directive.
2022-06-21T08:46:47.892484Z 0 [Warning] InnoDB: New log files created, LSN=45790
2022-06-21T08:46:48.340240Z 0 [Warning] InnoDB: Creating foreign key constraint system tables.
2022-06-21T08:46:48.529587Z 0 [Warning] No existing UUID has been found, so we assume that this is the first time that this server has been started. Generating a new UUID: b0091a7a-f13e-11ec-88ab-f8bc127be655.
2022-06-21T08:46:48.553733Z 0 [Warning] Gtid table is not ready to be used. Table 'mysql.gtid_executed' cannot be opened.
2022-06-21T08:46:48.902557Z 0 [Warning] 
2022-06-21T08:46:48.902576Z 0 [Warning] 
2022-06-21T08:46:48.903104Z 0 [Warning] CA certificate ca.pem is self signed.
2022-06-21T08:46:49.000295Z 1 [Note] A temporary password is generated for [email protected]: 78nj;Ar

You can see mysql Successful initialization , And generate a temporary password .

start-up sql node , First, copy the startup script from the installation package to /etc/init.d/mysqld, And then use service mysqld start start-up mysql service .

cp support-files/mysql.server /etc/init.d/mysqld

#  Add to the self start service item 
chkconfig --add mysqld

# Start the service 
service mysqld start

5. Installing data nodes and sql node （192.168.17.85）

Refer to the previous section for installation and configuration methods .

5.1 Installation preparation

Upload the installation package to linux, Do the following .

groupadd mysql
useradd mysql -g mysql

tar xvf mysql-cluster-gpl-7.6.22-linux-glibc2.12-x86_64.tar.gz 

mv mysql-cluster-gpl-7.6.22-linux-glibc2.12-x86_64 /usr/local/mysql

5.2  Install the data node

vi /etc/my.cnf

The contents are as follows ：

#  Data node configuration 
[myqld]
basedir=/usr/local/mysql
datadir=/apps/mysql/data/ndbdata
user=mysql
socket=/apps/mysql/data/ndbsock/mysql.sock

symbolic-links=0

[mysql_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

[mysql_cluster]
ndb-connectstring=192.168.17.81

Initialize and start ndb node ：

./ndbd --initial
2022-06-21 16:44:09 [ndbd] INFO     -- Angel connected to '192.168.17.81:1186'
2022-06-21 16:44:09 [ndbd] INFO     -- Angel allocated nodeid: 12

  You can see ndb The node is connected to the cluster .

5.3  install sql node

The configuration file my.cnf

# SQL Node configuration 
[client]
socket=/apps/mysql/data/sqlsock/mysql.sock

[mysqld]
ndbcluster
datadir=/apps/mysql/data/sqldata
socket=/apps/mysql/data/sqlsock/mysql.sock
ndb-connectstring=192.168.17.81

[mysql_cluster]
ndb-connectstring=192.168.17.81

initialization mysql

# ./mysqld --user=root --initialize
2022-06-21T08:46:45.758523Z 0 [Warning] Ignoring user change to 'root' because the user was set to 'mysql' earlier on the command line

2022-06-21T08:46:45.765892Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2022-06-21T08:46:45.765987Z 0 [ERROR] Can't find error-message file '/apps/mysql/data/share/errmsg.sys'. Check error-message file location and 'lc-messages-dir' configuration directive.
2022-06-21T08:46:47.892484Z 0 [Warning] InnoDB: New log files created, LSN=45790
2022-06-21T08:46:48.340240Z 0 [Warning] InnoDB: Creating foreign key constraint system tables.
2022-06-21T08:46:48.529587Z 0 [Warning] No existing UUID has been found, so we assume that this is the first time that this server has been started. Generating a new UUID: b0091a7a-f13e-11ec-88ab-f8bc127be655.
2022-06-21T08:46:48.553733Z 0 [Warning] Gtid table is not ready to be used. Table 'mysql.gtid_executed' cannot be opened.
2022-06-21T08:46:48.902557Z 0 [Warning] 
2022-06-21T08:46:48.902576Z 0 [Warning] 
2022-06-21T08:46:48.903104Z 0 [Warning] CA certificate ca.pem is self signed.
2022-06-21T08:46:49.000295Z 1 [Note] A temporary password is generated for [email protected]: 78nj;Ar

You can see mysql Successful initialization , And generate a temporary password .

start-up sql node , First, copy the startup script from the installation package to /etc/init.d/mysqld, And then use service mysqld start start-up mysql service .

cp support-files/mysql.server /etc/init.d/mysqld

#  Add to the self start service item 
chkconfig --add mysqld

# Start the service 
service mysqld start

6. Start the cluster and perform the test

6.1 Start the test

Startup sequence ： Start the management node , Start data node , start-up sql node .

After startup , View... In the management node ：

# ./ndb_mgm -e show    
Connected to Management Server at: localhost:1186
Cluster Configuration
---------------------
[ndbd(NDB)]     2 node(s)
id=12   @192.168.17.83  (mysql-5.7.38 ndb-7.6.22, Nodegroup: 0, *)
id=22   @192.168.17.85  (mysql-5.7.38 ndb-7.6.22, Nodegroup: 0)

[ndb_mgmd(MGM)] 1 node(s)
id=11   @192.168.17.81  (mysql-5.7.38 ndb-7.6.22)

[mysqld(API)]   2 node(s)
id=13   @192.168.17.83  (mysql-5.7.38 ndb-7.6.22)
id=23   @192.168.17.85  (mysql-5.7.38 ndb-7.6.22)

You can see , Two ndb Node and two sql node , Have been connected to the management node .

6.2 Create database test

stay 17.83 Node to create a database ：

mysql> create database ndb_test;
Query OK, 1 row affected (0.01 sec)

stay 17.85 view the database ：

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| ndb_test           |

It indicates that the creation of the database can be synchronized automatically . 

6.3 Create table tests

stay 17.85 Create table ndb_table_test1：

mysql> use ndb_test
Database changed
mysql> 
mysql> create table ndb_table_test1(id int);
Query OK, 0 rows affected (0.17 sec)

stay 17.83 See the table ndb_table_test1：

mysql> use ndb_test;
Database changed
mysql> show tables;
Empty set (0.00 sec)

  Found in 17.85 Create a table , stay 17.83 It's invisible .

Again in 17.85 Create table ndb_table_test2, Specify the engine NDBCLUSTER：

mysql> create table ndb_table_test2(id int) ENGINE = NDBCLUSTER; 
Query OK, 0 rows affected (0.39 sec)

stay 17.83 See the table ：

mysql> show tables;
+--------------------+
| Tables_in_ndb_test |
+--------------------+
| ndb_table_test2    |
+--------------------+
1 row in set (0.00 sec)

This time you can see the created table , So only specified NDBCLUSTER The engine's table , Can be visible in other nodes . 

6.4 Add data tests

stay 17.83 Add data ：

mysql> insert into ndb_table_test2 values(1);
Query OK, 1 row affected (0.00 sec)

stay 17.85 View the data ：

mysql> select * from ndb_table_test2
    -> ;
+------+
| id   |
+------+
|    1 |
+------+
1 row in set (0.01 sec)

  You can see , Data written by a node , Another node can see the written data .

7. Problems encountered during installation and deployment and solutions

7.1 The firewall blocks the communication between the data node and the management node

The firewall open port of the management node is required 1186.

# firewall-cmd --zone=public --add-port=1186/tcp --permanent
success
# firewall-cmd --reload
success

7.2  The firewall blocked sql Communication between the node and the management node

to open up sql node 3306 port

# firewall-cmd --zone=public --add-port=3306/tcp --permanent
success
# firewall-cmd --reload
success

7.3 sql After the node is started , Password reset required

After logging in with a temporary password , You need to reset your password to access .

./bin/mysql -uroot -p

set password = password('newpassword');

7.4 mysql Remote access authorization

use mysql
update user set host='%' where user = 'root';
flush privileges;

7.5 Directory does not exist or does not have permission

Some configured directories need to be created manually , Creating a directory requires mysql Be able to access . When starting the error report , Please check the corresponding error message .

7.6 Data nodes and sql Nodes share configuration files

The configuration file /etc/my.cnf

[mysqld]
basedir=/usr/local/mysql
datadir=/apps/mysql/data/ndbdata
user=mysql
socket=/apps/mysql/data/ndbsock/mysql.sock

symbolic-links=0

[mysql_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

[mysql_cluster]
ndb-connectstring=192.168.17.81

# SQL Node configuration 
[client]
socket=/apps/mysql/data/sqlsock/mysql.sock

[mysqld]
ndbcluster
datadir=/apps/mysql/data/sqldata
socket=/apps/mysql/data/sqlsock/mysql.sock
ndb-connectstring=192.168.17.81

[mysql_cluster]
ndb-connectstring=192.168.17.81