mysql8 installation under linux

mysql8 installation under linux

Download the installation package

Download address: https://dev.mysql.com/downloads/mysql/
Upload to the linux server or download directly on the server through get

Unzip the installation package

Unzip the installation package just downloaded and rename the directory to: mysql8
Directory path: /data/mysql8
Create data directory: /data/mysql8/data

Create mysql user and give permission

groupadd mysql
useradd -g mysql mysql
mkdir /var/lib/mysql
mkdir /data/mysql8/log
touch /data/mysql8/log/mysql.log
chown -R mysql.mysql /data/mysql8
chown -R mysql.mysql /var/lib/mysql

Initialize data

Enter the decompressed bin directory: /data/mysql8/bin and execute the following command (note: the root password printed on the console when the command below is executed needs to be written down and used later. For example, [email protected]: password)
./mysqld --user=mysql --basedir=/data/mysql8 --datadir=/data/mysql8/data/ --initializ

Note: Commands not found by "libaio.so.1" will be reported here.Install and solve by yum install libaio*, then re-execute the above command

Modify configuration

After initialization, the configuration file /etc/my.cnf will be generated.Modify it with vi /etc/my.cnf
The main increase configuration is as follows:
basedir=/data/mysql8
datadir=/data/mysql8/data
#Modify the directory to solve the problem that localhost cannot beConnection problems
socket=/var/lib/mysql/mysql.sock

[mysqld_safe]
log-error=/data/mysql8/log/mysql.log
pid-file=/data/mysql18/log/mysql.pid

[client]
#Modify the directory to solve the problem that localhost cannot be connected
socket=/var/lib/mysql/mysql.sock

The complete configuration is as follows:

[mysqld]basedir=/data/mysql8datadir=/data/mysql8/datasocket=/var/lib/mysql/mysql.sock# Disabling symbolic-links is recommended to prevent assorted security riskssymbolic-links=0# lower_case_table_names=1character_set_server=utf8mb4init_connect='SET collation_connection=utf8mb4_unicode_ci'init_connect='SET NAMES utf8mb4'collation-server=utf8mb4_unicode_ciskip-character-set-client-handshake# Settings user and group are ignored when systemd is used.# If you need to run mysqld under a different user or group,# customize your systemd unit file for mariadb according to the# instructions in http://fedoraproject.org/wiki/Systemd[mysqld_safe]log-error=/data/mysql8/log/mysql.logpid-file=/data/mysql18/log/mysql.pid## include all files from the config directory#!includedir /etc/my.cnf.d[client]default-character-set=utf8mb4#Modify the directory to solve the problem that localhost cannot be connectedsocket=/var/lib/mysql/mysql.sock[mysql]default-character-set=utf8mb4

Set environment variables

vi /etc/profile
Add at the end:
export MYSQL_PATH=/data/mysql8/bin/
export PATH='/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin:/data/mysql8/bin'
Finally, remember to execute: source /etc/profile

Register mysql as a service

cp /data/mysql8/support-files/mysql.server /etc/init.d/mysql
chmod +x /etc/init.d/mysql

Add mysql to startup

chkconfig --add mysql
chkconfig --list
Note: If the result of the chkconfig --list command mysql items 3 4 5 are all on, it is successful, otherwise it can be repaired by chkconfig --level 345 mysql onThe

Start mysql service

service mysql start

Change root account password

Log in to myql: mysql -hlocalhost -uroot -p
Enter the initialized password above
Modify the root default password: ALTER USER 'root'@'localhost' IDENTIFIED BY 'new password'
Note:Must be modified, no modification is allowed to perform other operations
At this point, the installation is complete. If you need to connect to other machines, you need to create a user and give permissions, refer to the "other commands" below as needed.

Other commands

Create database: CREATE DATABASE database name;
Create user: create user 'user name' identified by 'password'
Set root user remote access: first use mysql; then update user set host='%' where user='root';
Give database permissions: grant all privileges on database name.* to 'utest'@'%';
Refresh permissions: flush privileges; remember to use this command to refresh after modifying permissionslower permissions

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