Detailed steps for installing MySQL 8.0 under Linux

Linux Lower installation MySQL8.0 Step by step

• • First step ： Download installation configuration
  • The second step ： Change Password , And set up remote connection （ In order to connect this under other machines mysql）

Set up a cloud server , The first thing to do is to install the database , stay Windows It goes without saying that , Fool operation , stay Linux At least record the installation on .

I'm using XShell7 ssh Connection tool access Linux, The usage and commands of other tools are the same , The interface is as follows ：

What I use here is not root User logged in , So switch to root user , command ：su

First step ： Download installation configuration

1. Switch to /usr/local/

   cd /usr/local/

2. establish mysql Folder

   mkdir mysql

3. Switch to mysql Under the folder

   cd mysql

4. download mysql8.0 Installation package

   wget https://dev.mysql.com/get/Downloads/MySQL-8.0/mysql-8.0.20-linux-glibc2.12-x86_64.tar.xz

Wait for the download to succeed

5. decompression mysql8.0 Installation package

   tar xvJf mysql-8.0.20-linux-glibc2.12-x86_64.tar.xz

6. Rename the extracted folder , This is changed into mysql-8.0

   mv mysql-8.0.20-linux-glibc2.12-x86_64 mysql-8.0

7. . /use/local/mysql-8.0 Create under folder data Folder Storage file

   mkdir data

8. Create user groups and users and passwords respectively （ If the prompt already exists, it indicates that it has been created before ）

   groupadd mysql

   useradd -g mysql mysql

9. Authorize the newly created user

   chown -R mysql.mysql /usr/local/mysql/mysql-8.0
   
   chmod 750 /usr/local/mysql/mysql-8.0/data -R
   

10. Configuration environment , edit /etc/profile file

Be careful ： There's a pit here , After configuring the environment variables , You need to perform sourc /etc/profile command , Make profile effective

vim /etc/profile
#--------------------------
# Click on the i key , Enter input mode , Add a line at the end of the configuration file ：
#--------------------------
export PATH=$PATH:/usr/local/mysql/mysql-8.0/bin:/usr/local/mysql/mysql-8.0/lib
# When I'm done , Press Esc Key to exit input mode , Enter command mode , Input :wq, Save and exit 
# And then input cat /etc/profile   See if it was saved successfully , The effect is as follows ：↓↓↓↓↓↓

11. edit my.cnf file

vi /etc/my.cnf


[mysql]
default-character-set=utf8mb4
[client]
#port=3306
socket=/var/lib/mysql/mysql.sock

[mysqld]
#port=3306
#server-id=3306
user=mysql
general_log = 1
general_log_file= /var/log/mysql/mysql.log
socket=/var/lib/mysql/mysql.sock
basedir=/usr/local/mysql/mysql-8.0
datadir=/usr/local/mysql/mysql-8.0/data
log-bin=/usr/local/mysql/mysql-8.0/data/mysql-bin
innodb_data_home_dir=/usr/local/mysql/mysql-8.0/data
innodb_log_group_home_dir=/usr/local/mysql/mysql-8.0/data/
character-set-server=utf8mb4
lower_case_table_names=1
autocommit=1
default_authentication_plugin=mysql_native_password
symbolic-links=0
# Disabling symbolic-links is recommended to prevent assorted security risks
# 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=/usr/local/mysql/mysql-8.0/data/mysql.log
pid-file=/usr/local/mysql/mysql-8.0/data/mysql.pid

#
# include all files from the config directory

12. Switch to /usr/local/mysql/mysql-8.0/bin Under the table of contents

cd bin

13. Initialize basic information , Get the initial password of the database （ stay /usr/local/mysql/mysql-8.0/bin Execute under directory ）

./mysqld --user=mysql --basedir=/usr/local/mysql/mysql-8.0 --datadir=/usr/local/mysql//mysql-8.0/data/ --initialize
# Once the initialization is complete , Copy the last initial password , If you save it, you need （ This step seems useless ）
#igTn=3j-

14. Copy mysql.server file , stay /usr/local/mysql/mysql-8.0 Execute under directory

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

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

15. To give permission

chown 777 /etc/my.cnf

chmod +x /etc/init.d/mysql

chmod +x /etc/init.d/mysqld

16. Check the /var/lib/mysql Whether there is , Otherwise, create

mkdir /var/lib/mysql


chown -R mysql:mysql /var/lib/mysql/ 

17. Start database , Yes SUCCESS Word description MySQL installation is complete

service mysql start 
# appear SUCCESS  Indicating successful startup , The renderings are as follows ：

ps:
If startup fails , You can check it first data Inside mysql.log, If there's a hint 3306 Words like this , The first thought should be that the port is occupied ,
Use lsof -i: Port number , Check which one is PID（ Process number ） The port is occupied , And then use kill PID（ Process number ） Kill the process , Re execution service mysql start

The second step ： Change Password , And set up remote connection （ In order to connect this under other machines mysql）

I wasted a lot of time at the beginning of this step . If you log in with the previous initial password , The following errors may occur ：

At this stage , Studied for a long time , Record the process ：

• stay vim /etc/my.cnf In file , stay [mysqld] Add a sentence to the paragraph ：skip-grant-tables -- Skip password verification
• Then save to exit , restart MySQL service
• Then input mysql -uroot -p Hit enter twice , Get into mysql
• USE mysql ; -- Access to database
• stay mysql8.0 in , This update syntax cannot be used UPDATE user SET Password = password ( ‘new-password’ ) WHERE User = ‘root’ ; Use this ：ALTER USER ‘root’@‘localhost’ IDENTIFIED WITH mysql_native_password BY ‘ New password ’;
• Finally, just follow the steps below .

1. modify the database root Password of account , And set up remote access （ because root The default is not remotely accessible ）

   ALTER USER ‘root’@‘localhost’ IDENTIFIED WITH mysql_native_password BY ‘ New password ’;

2. perform flush privileges; Make the password effective

   flush privileges;# Refresh the permissions

3. Select database

   use mysql;

4. Then modify the remote connection and take effect

   mysql> create user ‘root’@‘%’ identified by ‘password’;
   Query OK, 0 rows affected (0.03 sec)

   mysql> grant all privileges on . to ‘root’@‘%’ with grant option;
   Query OK, 0 rows affected (0.01 sec)

   mysql> flush privileges;
   Query OK, 0 rows affected (0.00 sec)

5. Execute the submit command , Get it done ！

   flush privileges;# Refresh the permissions