Install MySQL database version 5.7.29 under ubuntu20.04 system

because apt-get Can only be installed 8.0 edition , Considering that there are more information in the lower version , For the convenience of learning , Decide to install 5.7 edition

Here are the installation steps

1. download 5.7.29 edition

MySQL :: Download MySQL Community Server (Archived Versions)https://downloads.mysql.com/archives/community/

Download the first package DEB Bundle(mysql-server_5.7.29-1ubuntu18.04_i386.deb-bundle.tar)

1. Unzip downloaded files ： tar -xvf mysql-server_5.7.29-1ubuntu18.04_amd64.deb-bundle.tar
2. Enter the following command in the terminal :

（ Be careful , Here is the installation sequence . This is an important step , There are dependencies between files ）：

dpkg -i libmysqlclient20_5.7.29-1ubuntu18.04_amd64.deb

dpkg -i libmysqlclient-dev_5.7.29-1ubuntu18.04_amd64.deb

dpkg -i libmysqld-dev_5.7.29-1ubuntu18.04_amd64.deb

dpkg -i mysql-common_5.7.29-1ubuntu18.04_amd64.deb

dpkg -i mysql-community-source_5.7.29-1ubuntu18.04_amd64.deb

dpkg -i mysql-community-client_5.7.29-1ubuntu18.04_amd64.deb

apt-get install libaio1 libtinfo5

dpkg -i mysql-client_5.7.29-1ubuntu18.04_amd64.deb

apt-get install libmecab2

dpkg -i mysql-community-server_5.7.29-1ubuntu18.04_amd64.deb

dpkg -i mysql-server_5.7.29-1ubuntu18.04_amd64.deb

3. After the installation is completed, test ：

start-up mysql service :

service mysql start

Get into MySQL:

mysql -u root -p

modify mysql The binding port of

Abrupt 1. open mysql Configuration file for , Here is the default installation path , vi /etc/mysql/mysql.conf.d/mysqld.cnf

step 2. Add... In the last line port = 3307

step 3. After the save , restart mysql service ,service mysql restart

step 4. Command line login mysql,mysql -u root -p

step 5. Check the open port number ,show variables like 'port';