Detailed explanation of mysqld_multi deployment single machine

This time I will bring you a detailed explanation of the deployment of mysqld_multi on a single machine. What are the precautions for deploying a single machine on mysqld_multi? The following is a practical case, let's take a look.

Preface

Everyone should have understood that with the development of hardware level, multi-core Linux systems have become a common trend, and mysql is A single process has multiple threads, so the utilization of multi-processes is not very high. Although version 5.6 has improved a lot in this regard, it has not reached 100%. Therefore, in order to make full use of system resources, MySQL has its own supplements, that is Multiple instances can be deployed, one instance per port.

mysqld_multi is designed to manage multiple mysqld processes running on the same machine, which use different socket files and listen on different ports. mysqld_multi can start, shut down, or report the status of these mysqld processes in batches.

Not much to say below, let’s take a look at the detailed introduction.

1. Mysql compilationInstallation:

cd /usr/local/src
wget http://mirrors.sohu.com/mysql/MySQL-5.6/mysql-5.6.35-linux-glibc2.5-x86_64.tar.gz 
tar zxvf mysql-5.6.35-linux-glibc2.5-x86_64.tar.gz
mv mysql-5.6.35-linux-glibc2.5-x86_64 /usr/local/mysql
cd /usr/local/mysql
useradd mysql
mkdir -p /data/mysql
chown -R mysql:mysql /data/mysql
./scripts/mysql_install_db --user=mysql --datadir=/data/mysql
cp support-files/my-default.cnf /etc/my.cnf
cp support-files/mysql.server /etc/init.d/mysqld

2. Prepare the first one Example 3307

2.1 Create directory:

mkdir /usr/local/mysql3307
chown -R mysql.mysql /usr/local/mysql3307/
mkdir -p /data/mysql3307
chown -R mysql.mysql /data/mysql3307
mkdir -p /home/data/mysql3307/binlog
chown -R mysql.mysql /home/data/mysql3307

2.2 Configuration file

[root@zhdya01 ~]# vim /etc/my.cnf
# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html
# *** DO NOT EDIT THIS FILE. It's a template which will be copied to the
# *** default location during install, and will be replaced if you
# *** upgrade to a newer version of MySQL.
[mysqld_multi]
mysqld = /usr/local/mysql/bin/mysqld_safe
mysqladmin =/usr/local/mysql/bin/mysqladmin
log =/var/log/mysqld_multi.log
[mysqld1]
socket = /usr/local/mysql3307/mysql.sock
port = 3307
pid-file = /usr/local/mysql3307/mysql.pid
datadir = /data/mysql3307
log_bin=/home/data/mysql3307/binlog
server-id = 1
innodb_buffer_pool_size = 128M
innodb_flush_log_at_trx_commit = 0

2.3 Initialize the database

/usr/local/mysql/scripts/mysql_install_db --user=mysql --basedir=/usr/local/mysql --datadir=/data/mysql3307

3. Prepare the second multi-instance 3308

##3.1 Create directory:

mkdir /usr/local/mysql3308
chown -R mysql.mysql /usr/local/mysql3308/
mkdir -p /data/mysql3308
chown -R mysql.mysql /data/mysql3308
mkdir -p /home/data/mysql3308/binlog
chown -R mysql.mysql /home/data/mysql3308

3.2 Configuration file

[root@zhdya01 ~]# vim /etc/my.cnf
# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html
# *** DO NOT EDIT THIS FILE. It's a template which will be copied to the
# *** default location during install, and will be replaced if you
# *** upgrade to a newer version of MySQL.
[mysqld_multi]
mysqld = /usr/local/mysql/bin/mysqld_safe
mysqladmin =/usr/local/mysql/bin/mysqladmin
log =/var/log/mysqld_multi.log
[mysqld1]
socket = /usr/local/mysql3307/mysql.sock
port = 3307
pid-file = /usr/local/mysql3307/mysql.pid
datadir = /data/mysql3307
log_bin=/home/data/mysql3307/binlog
server-id = 1
innodb_buffer_pool_size = 128M
innodb_flush_log_at_trx_commit = 0
[mysqld2]
socket = /usr/local/mysql3308/mysql.sock
port = 3308
pid-file = /usr/local/mysql3308/mysql.pid
datadir = /data/mysql3308
log_bin=/home/data/mysql3308/binlog
server-id = 2
innodb_buffer_pool_size = 128M
innodb_flush_log_at_trx_commit = 0

3.3 Initialize database

/usr/local/mysql/scripts/mysql_install_db --user=mysql --basedir=/usr/local/mysql --datadir=/data/mysql3308

4. Start multiple instances

/etc/init.d/mysqld start
mysqld_multi --defaults-extra-file=/etc/my.cnf start 1,2
[root@zhdya01 bin]# !net
netstat -lntp -lntp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address  Foreign Address  State PID/Program name 
tcp 0 0 0.0.0.0:22  0.0.0.0:*  LISTEN 1241/sshd  
tcp 0 0 127.0.0.1:25  0.0.0.0:*  LISTEN 2087/master  
tcp6 0 0 :::3306   :::*   LISTEN 4406/mysqld  
tcp6 0 0 :::3307   :::*   LISTEN 4197/mysqld  
tcp6 0 0 :::3308   :::*   LISTEN 3359/mysqld  
tcp6 0 0 :::8080   :::*   LISTEN 2222/java  
tcp6 0 0 :::22   :::*   LISTEN 1241/sshd  
tcp6 0 0 ::1:25   :::*   LISTEN 2087/master

5. Check the startup status

[root@zhdya01 bin]# mysqld_multi --defaults-extra-file=/etc/my.cnf report
Reporting MySQL servers
MySQL server from group: mysqld1 is running
MySQL server from group: mysqld2 is running

6. Stop multiple instances

[root@zhdya01 bin]# mysqld_multi --defaults-extra-file=/etc/my.cnf stop 1,2
[root@zhdya01 bin]# mysqld_multi --defaults-extra-file=/etc/my.cnf report
Reporting MySQL servers
MySQL server from group: mysqld1 is not running
MySQL server from group: mysqld2 is not running

7. Log in to the mysql instance respectively

[root@zhdya01 bin]# mysql --socket=/usr/local/mysql3307/mysql.sock
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.6.35-log MySQL Community Server (GPL)
Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql>

Believe it or not After reading the case in this article, you have mastered the method. For more exciting information, please pay attention to other related articles on the PHP Chinese website!

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