[MySQL] installation tutorial and master-slave configuration

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        Configuring master-slave libraries in an enterprise is an essential link , It can avoid the database downtime caused by many wonderful operations, which will cause the application to hang up .mysql The master-slave configuration of is relatively simple , Follow the document step by step , It's easy to use . I hope it will be of some help to you ！

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Catalog

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Preface

One 、 install

Two 、 Master slave configuration

1 Turn off firewall （ It can be modified to allow port communication ）

2 Whether the master-slave test can be accessed remotely

3 Master database creation user slave And authorize （ Password complexity ）

4 Master database query service ID And Master state

5 Set the master library from the Library

3、 ... and Limit user failure retry time

1、 Execute... From the library ：

2、 Main library execution ：

3、 Install the plug-in after login ：

4、 The main library modifies the configuration file my.cnf Add two lines ：

5 restart mysql：

6、 Execute... From the library ：

7、 Install the plug-in after login ：

8、 Modify the configuration file from the Library my.cnf Add two lines ：

9、 Restart from library mysql：

10、 Execute... From the library ：

11、 Inquire about slave state

summary

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Preface

       Installation package ：  mysql-8.0.26-linux-glibc2.12-x86_64.tar.xz

       operating system ：  Centos8 And Kirin （ All have been tested and work well ）

       Server address ：10.10.109.8   10.10.109.9

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One 、 install

# decompression

tar -xvf mysql-8.0.26-linux-glibc2.12-x86_64.tar.xz

# Move

mv /opt/mysql-8.0.26-linux-glibc2.12-x86_64 /data

cd /data

mv mysql-8.0.26-linux-glibc2.12-x86_64 mysql

# Create a folder for storing data ( disk array )

mkdir -p /mysql/data

chmod -R 777 /mysql /data

# Create user （ Complexity requirements ）

groupadd mysql

useradd -g mysql mysql

chown -R mysql.mysql /data/mysql

# Initialize database

cd /data/mysql/

./bin/mysqld --user=mysql --lower-case-table-names=1 --basedir=/data/mysql/ --datadir=/mysql/data/ --initialize ;

# Configure the main library my.cnf （ Modify the default port ）

vi /etc/my.cnf

[client]

port=3209

socket=/data/mysql/mysql.sock


[mysqld]

port=3209

basedir=/data/mysql

datadir=/mysql/data

pid-file=/data/mysql/mysql.pid

socket=/data/mysql/mysql.sock

log_error=/data/mysql/error.log

server-id=1

character-set-server=utf8

lower-case-table-names=1

log-bin=mysql-bin

binlog-ignore-db=sys

binlog-ignore-db=mysql

binlog-ignore-db=information_schema

binlog-ignore-db=performance_schema

binlog_format=STATEMENT

open-files-limit=65000

default_authentication_plugin=mysql_native_password

innodb_buffer_pool_size=3GB

# start-up mysql

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

chmod +x /etc/init.d/mysql

chkconfig --add mysql

• Check whether the service is effective

chkconfig --list mysql

create a file

chmod -R 777 /mysql/data/

cd /data/mysql

touch error.log

touch mysql.pid

chmod –R 777  /data/mysql

• start-up 、 stop it 、 restart

service mysql start

service mysql stop

chown -R mysql.mysql /data/mysql

service mysql restart

# Create a soft connection

ln -s /data/mysql/bin/mysql /usr/bin

ln -s /usr/lib64/libtinfo.so.6.1 /usr/lib64/libtinfo.so.5

# modify root password （ Complexity requirements ）

mysql -uroot -p

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'new password';

# Increase remote link permissions

use mysql

update user set host ='%' where user='root';

select user,host from user;

Two 、 Master slave configuration

1 Turn off firewall （ It can be modified to allow port communication ）

# View firewall status

systemctl status firewalld

# Turn off firewall

systemctl stop firewalld

2 Whether the master-slave test can be accessed remotely

mysql -uroot -p -h10.10.109.8

mysql -uroot -p -h10.10.109.9

3 Master database creation user slave And authorize （ Password complexity ）

mysql -uroot -p

create user 'slave'@'%' identified with mysql_native_password by 'password';

grant replication slave on *.* to 'slave'@'%';

flush privileges;

4 Master database query service ID And Master state

# Sign in

mysql -uroot -p

# Inquire about server_id Whether it can be consistent in the configuration file

show variables like 'server_id';

# If it's not the same , Temporary settings can be set ID（ Restart failure ）

set global server_id = 1;

# Inquire about Master state , And record File and Position Value

show master status;

5 Set the master library from the Library

mysql -uroot -p

# Inquire about server_id Whether it can be consistent in the configuration file

show variables like 'server_id';

# If it's not the same , Temporary settings can be set ID（ Restart failure ）

set global server_id = 2;

# Set main database parameters

change master to master_host='10.10.109.8',master_port=3209,master_user='slave',master_password=' password ',master_log_file='mysql-bin.000006',master_log_pos=2812;

# Start syncing

start slave;

# Supported operations

stop slave;

reset slave;

start slave;

# Inquire about slave state

show slave status\G;

# If the master and slave databases are inconsistent , When deleting the master database, the slave database will report an error , Solution ：

stop slave;

# skip 1 A mistake （ Multiple can be set 2.3……）

SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 1; 

start slave; 

# In query status , If there are still mistakes, continue to skip

show slave status\G;

The final status is as follows ：

3、 ... and Limit user failure retry time

1、 Execute... From the library ：

stop slave;

2、 Main library execution ：

mysql -u root -p

3、 Install the plug-in after login ：

installplugin CONNECTION_CONTROL soname'connection_control.so';

installplugin CONNECTION_CONTROL_FAILED_LOGIN_ATTEMPTS soname'connection_control.so';

4、 The main library modifies the configuration file my.cnf Add two lines ：

connection-control-failed-connections-threshold=5# Limit the number of login failures

connection-control-min-connection-delay=300000# Limit retrying time , Here is the millisecond , Pay attention to conversion according to demand , Here is 5 minute

5 restart mysql：

service mysql restart

Log in to the main database , See if it works

show variables like '%connection_control%'; 

6、 Execute... From the library ：

mysql -u root -p

7、 Install the plug-in after login ：

installplugin CONNECTION_CONTROL soname'connection_control.so';

installplugin CONNECTION_CONTROL_FAILED_LOGIN_ATTEMPTS soname'connection_control.so';

8、 Modify the configuration file from the Library my.cnf Add two lines ：

connection-control-failed-connections-threshold=5# Limit the number of login failures connection-control-min-connection-delay=300000# Limit retrying time , Here is the millisecond , Pay attention to conversion according to demand , Here is 5 minute

9、 Restart from library mysql：

service mysql restart

Log in from the library database , See if it works

show variables like '%connection_control%'; 

10、 Execute... From the library ：

start slave;

11、 Inquire about slave state

show slave status\G;

The end

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summary

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