Linux Installation mysql5

• centos7

Get ready

1. see Linux Is... Installed in Mysql perhaps Maridb, If installed, there will be output

rpm -qa|grep mysql
rpm -qa|grep mariadb

2. uninstall mysql perhaps maridb

rpm -e --nodeps mysql-libs-5.1.73-7.el6.x86_64
rpm -e --nodeps mariadb-libs-5.5.56-2.el7.x86_64

MySQL Compressed package

1. download

• https://downloads.mysql.com/archives/community/
  

2. Upload

3. decompression

• tar -xvf mysql-5.7.36-1.el7.x86_64.rpm-bundle.tar

4. After decompression, you get the following rpm package , Install the required... In turn rpm package

• rpm -ivh mysql-community-common-5.7.36-1.el7.x86_64.rpm
• rpm -ivh mysql-community-libs-5.7.36-1.el7.x86_64.rpm
• rpm -ivh mysql-community-libs-compat-5.7.36-1.el7.x86_64.rpm
• rpm -ivh mysql-community-client-5.7.36-1.el7.x86_64.rpm
• rpm -ivh mysql-community-server-5.7.36-1.el7.x86_64.rpm
• If an error is reported , Add... At the end of the above command --force --nodeps

5. Check the installation

• rpm -qa | grep mysql
  

start-up mysql service

• systemctl start mysqld.service
• If the startup error , It can be executed journalctl -xe Command to view error messages

---

• Here is an error report
  
• solve

 Check to see if it is installed libaio
	rpm -qa | grep libaio
 If there is no output, install 
	yum install -y libaio
 Start again 
	systemctl start mysqld.service

---

Set new password

1. Check the initial password ( Remember that this password will be used later )

• cat /var/log/mysqld.log | grep password
  

2. Log in with the initial password mysql

• mysql -uroot -p
  

3. Reset password

• SHOW variables LIKE ‘validate_password%’;
• Report errors
  
• exit sign out mysql Console
• vim /etc/my.cnf
  

# Add password verification plug-in 
plugin-load-add=validate_password.so
# The server loads the plug-in at startup , And prevent the plug-in from being deleted when the server is running 
validate-password=FORCE_PLUS_PERMANENT

• restart mysql

systemctl restart mysqld

• Get into mysql

mysql -uroot -p

• Modify the verification strategy to low

set global validate_password_policy=0;

• Change the minimum password length to 1

set global validate_password_length=1;

• Set new password
  

alter user 'root'@'localhost' identified by 'aaaa';

• After setting, re-enter mysql The server , Enter a new password to log in

exit
mysql -uroot -p

to open up mysql Port of the database , Allow remote connections

1. Check if the firewall is turned off , Close if not

• systemctl status firewalld.service
  
• Turn off the firewall temporarily

systemctl stop firewalld.service

• Permanently shut down firewall

systemctl disable firewalld.service

2. Set up mysql Remote connection permissions

• mysql -uroot -p
• show databases;
• use mysql;
• select user,host from user;
• update user set host = ‘%’ where user = ‘root’;

% For any access address 

• flush privileges;

 Refresh the permissions   Refresh will not work until the permission is updated 

Set up mysql Chinese code

1. Edit profile

• vim /etc/my.cnf
  

character-set-server=utf8

[client]
default-character-set=utf8

[mysql]
default-character-set=utf8

2. restart mysql service

• systemctl restart mysqld

Set up mysql Boot up

1. modify rc.local

• vim /etc/rc.local
  

service mysqld start