Detailed graphic explanation of installing MySQL database and configuring Java project on Linux

1. Install MySQL database

① Download and unzip and upload to the /opt/soft directory (the soft directory is created by yourself)

②Unzip: tar -xvf mysql-5.7.27-1.el7.x86_64.rpm-bundle.tar

③Clear the database that comes with Linux

1. Check if there is an old version of the database:

rpm -qa |grep mysql

rpm -qa | grep mariadb

2. Uninstall the existing database: (Uninstalling will also uninstall the dependent packages of this package)

yum -y remove mariadb-libs.x86_64

④Install MySQL community edition service package:

rpm -ivh mysql-community-server-5.7.27-1.el7.x86_64.rpm

It is found that 5 dependent packages are needed, so install the dependent packages first (needed dependencies)

1. Install perl's dependency packages:

yum -y install perl (here 27 packages with perl are installed, including 3 dependent packages)

2. Install the dependency package of mysql-community-client:

rpm -ivf mysql-community-client-5.7.27-1.el7.x86_64.rpm

It is found that this package depends on: mysql-community-libs, so install the mysql-community-libs package first.

Install the mysql-community-libs library package:

rpm -ivf mysql-community-libs-5.7.27-1.el7.x86_64.rpm

3. Install mysql-community-cient-5.7.27-1.el7.x86_64.rpm

4. Install the dependency package of mysql-community-common:

rpm -ivf mysql-community-common-5.7.27-1.el7.x86_64.rpm

⑤Install the MySQL community edition server package again:

rpm -ivh mysql-community-server-5.7.27-1.el7.x86_64.rpm

⑥Verify whether MySQL is installed successfully (if there is no error when starting, it means the installation is successful)

Start the mysql service: systemctl start mysqld.service

2. Find the temporary password and modify it

①Find the file that stores the temporary password:

find / -name mysql*log

②View temporary password:

more /var/log/mysql.log | grep temp

(The password is C_XMoVU7jjcW)

③ Enter mysql -u root -p and the temporary password to log in and enter the mysql database environment

④In the mysql database environment:

1. Set mysql password policy:

mysql>set global validate_password_policy=0;

2. Set the length of the mysql password:

mysql>set global validate_password_length=4;

3. Set password:

mysql>set password=password('123456');

4. Exit: quit; or ctrl+z

3. View and create remote connection users

① Check whether the user can connect remotely:

1. Log in: mysql -u root -p; enter the password to log in (123456)

2. Enter: use mysql;

3. View: select host,user,authentication_string from user;

②Create a remote user

1. Create a user: create user 'myroot'@'%' identified by '123456';

2. Grant permissions: grant all privileges on *.* to 'myroot'@'%';

3. Refresh: flush privileges;

4. Use Navicat tool to log in remotely

① Turn off the firewall: systemctl stop firewalld.service

② Make a connection

③Connection successful

5. Configure the Java project

The project contains: program package (.war) + data package (.sql)

①Upload the .war and program packages to the wbapps directory under tomcat (in the /opt/soft/apach-tomcat-8.5.47 directory)

② Import the .sql data package into Navicat (after connecting, left-click, and then click Run SQL File)

③Start the tomcat service: (Start in the bin directory under the apache-tomcat-8.5.47 directory)

sh startup.sh

④Modify the file that connects the project to the database so that the project can connect to the database

Default path: (The project will be automatically decompressed after uploading, refresh it first)

/opt/sotp/apache-tomcat-8.5.47/webapps/test/WEB-INF/classes

Revise:

1. Database service IP address: (Change to Linux IP address)

2. Database name: (Change to the project database name)

3. Username of the remote connection user: (username myroot)

4. Password of the remote connection user: (password of user myroot)

5. Save

⑥ Turn off the firewall:

systemctl stop firewalld.service

⑦Open the web page: enter 192.168.1.181:8080/test

⑧Enter username and password to test login

⑨Log in

The above is all the knowledge points about installing MySQL and configuring Java on Linux introduced this time. Thank you for your learning and support for 123WORDPRESS.COM.