Centos7 installing and uninstalling mysql5.7

One 、 Download from the official website
1、 Download installation package
Download the official website




Two . Use the compressed package FinalShell Upload to centos7 Server
1. decompression

tar -zxvf mysql-5.7.30-linux-glibc2.12-x86_64.tar.gz

2. Create a new one mysql Catalog , And move the extracted directory to this directory , Change of name

mkdir /usr/mysql
mv mysql-5.7.30-linux-glibc2.12-x86_64 /usr/mysql/mysql-5.7

3、 ... and . To configure
1、 Create under the installation path data Folder （ It will be used in subsequent configurations ）

cd /usr/mysql/mysql-5.7
mkdir data

2、 To configure my.cnf file
Modify the configuration file ：/etc/my.cnf If the configuration is incorrect , Incomplete initialization later , You won't get the default password .

vi /etc/my.cnf

from mysql5.7 It will not be generated automatically at first my.cnf File configuration , So you need to create it manually .my.cnf File input the following

basedir： Set up mysql Installation directory

datadir： Set up mysql Database data storage directory

It should be noted that datadir Parameters , Here I designate data Catalog ,data The directory doesn't exist. We need to create it manually

[mysql]
#  Set up mysql Client default character set 
default-character-set=utf8
# socket Communication configuration 
socket=/usr/mysql/mysql-5.7/data/mysql.sock
 
[mysqld]
#  Skip permission table verification : If you are in the my.cnf Add... To "skip-grant-tables", So any account with any password ( Of course, it also includes empty ) Can log in to mysql data > library 
#skip-grant-tables
#  The function is to prohibit domain name resolution : stay mysql The host name cannot be used in the authorization table of , Only use IP 
skip-name-resolve
#  Set up 3306 port 
port = 3306
#  Set up mysql Installation directory 
basedir=/usr/mysql/mysql-5.7
#  Set up mysql Database data storage directory 
datadir=/usr/mysql/mysql-5.7/data
socket=/usr/mysql/mysql-5.7/data/mysql.sock
#  Maximum connections allowed 
max_connections=200
#  The character set used by the server defaults to 8 Bit coded latin1 Character set 
character-set-server=utf8
#  The default storage engine that will be used when creating a new table 
default-storage-engine=INNODB
lower_case_table_names=1
max_allowed_packet=16M

[client]
default-character-set=utf8
socket=/usr/mysql/mysql-5.7/data/mysql.sock

ESC:+wq Save and exit .
3、 add to mysql user 、mysql Group
by centos add to mysql User group 、mysql user

groupadd mysql
 
useradd -r -g mysql mysql
 
chown -R mysql:mysql /usr/mysql/mysql-5.7/

# View groups and users

cat /etc/group | grep mysql

cat /etc/passwd |grep mysql

3、 ... and 、 Installing the
1、 initialization mysql database （ mount this database ）
Get into bin Under the path , initialization mysql database

# Get into bin Under the path 
cd /usr/mysql/mysql-5.7/bin
 
# Execute the initialize install command 
./mysqld --initialize --user=mysql --basedir=/usr/mysql/mysql-5.7 --datadir=/usr/mysql/mysql-5.7/data

Be careful ：

The console will output the temporary password , Please write down ： [email protected]:xxxxxx Initialize the two path configurations in the command ( Need to change to your own )
If it appears as shown in the above figure, the installation is successful ;
Here you need to remember the temporary password above , After logging into the database, you need to modify ;

2、 to /etc/init.d Folder copy mysql Service script , Set power on self start

First put the installation directory /support-files/mysql.server File copy to /etc/init.d/ Folder and rename it mysql.

cp /usr/mysql/mysql-5.7/support-files/mysql.server /etc/init.d/mysql
# Give enforceability ⾏ jurisdiction 
chmod +x /etc/init.d/mysql
#  Add service 
chkconfig --add mysql
#  display ⽰ List of services 
chkconfig --list
#  If you see mysql Service for , also 3、4、5 All are on If you don't, you succeed . If it is off, Then hold ⾏
chkconfig --level 345 mysql on

3、 start-up MySQL
Run the start command

#  Start command 
service mysql start
 
#  Check status command 
service mysql status
 
#  The shutdown command 
service mysql stop

4、 Add environment variables

vi /etc/profile

Add environment variables ：

export PATH=$PATH:/usr/mysql/mysql-5.7/bin

Make the environment configuration work

source /etc/profile

5. Create soft link

ln -s /usr/mysql/mysql-5.7/mysql.sock /usr/mysql/mysql-5.7/data/mysql.sock

6. restart MySql service

service mysql restart

Four 、 Login to change password
1、 Sign in
The password uses the temporary password returned during installation

mysql -u  user name  -p

2. change root User's password , And exit

ALTER USER 'root'@'localhost' IDENTIFIED BY 'root';
exit

5、 ... and 、 Authorize the remote host to allow connections mysql database
1、 Log back in mysql, Enter the password you just changed

mysql -u root -p

2、 Query configuration data

SELECT host,user,password_expired,password_last_changed,password_lifetime FROM mysql.user;

3、 Authorization command

grant all privileges on *.* to 'root'@'%' identified by 'root';

4、 Refresh Authorization ：

flush privileges;

here , Yours Mysql You can be connected remotely .

Close authorization

revoke all on *.* from [email protected];

5、 Firewall problem

If you still cannot access from external links , Please check whether your firewall configuration is open 3306 port
Or simply close the firewall , About centos Please refer to ：
centos Firewall shutdown tutorial

6、 ... and .MySQL The uninstall
1. Execute the find command

find / -name mysql

2. Delete all the directories found above

rm -rf  Directory name 

3. uninstall my.cnf

rm -rf etc/my.cnf # Delete it manually if it exists