Centos7 installation of jdk8, mysql5.7 and Navicat connection to virtual machine MySQL and solutions (solutions to MySQL download errors are attached)

JDK8 Download and install

use first VMwareWorkStation open Centos7 virtual machine .
And then use Xshell7 Perform remote login to the virtual machine , The reason why I use this is because it is very convenient .

Start by opening Xshell7, Get into root user
Enter the following command to enter opt Directory and create two folders

 Get into opt Catalog    [[email protected] software]# cd /opt  
 establish module Folder  [[email protected] opt]# mkdir module
 establish soft Folder  [[email protected] opt]# mkdir software

jdk8-Linux download
After downloading, there is a folder , We just need the inside tar.gz file
Then drag the file directly to software In this directory !

Then use the command to extract the file

[[email protected] software]#  tar -zxvf jdk-8u181-linux-x64.tar.gz -C /opt/module/

After unzipping, you need to jdk Configuration of environment variables
Input

cd /etc/profile.d
 Get into profile.d Create a file after the directory to configure jdk Environment variables of 
vim jdkenv.sh

Enter... After entering the file

export JAVA_HOME=/opt/module/jdk1.8.0_181
export PATH=$PATH:$JAVA_HOME/bin

After input : wq sign out
Then use source /etc/profile Reload , Make the script work
Once configured , Input java You can see java Has been configured successfully , Of course, you can also enter java -version

mysql5.7 Download and install

mysql The installation of the jdk So simple , because Centos7 It comes from the factory mariadb, So you need to uninstall this first .
Use instruction :

 Inquire about :rpm -qa | grep -i mariadb
 Delete :rpm -e --nodeps  mariadb-libs-5.5.68-1.el7.x86_64

Check to see if there is mariadb, Delete if there is

At the same time, confirm whether the machine has mysql, If there is , Delete , It's the same thing

 Inquire about :rpm -qa | grep -i mysql
 Delete :rpm -e --nodeps "mariadb-libs-5.5.68-1.el7.x86_64"

Make sure there is no mysql after , Use the following instructions to download the corresponding rpm file
Here you can create a place to put this rpm The package directory
For example, I was /opt/software Place this file under the

wget https://repo.mysql.com//mysql57-community-release-el7-9.noarch.rpm

appear Complete That is, after the completion , Continue with the following

After input

[[email protected] software]# rpm -ivh mysql57-community-release-el7-9.noarch.rpm 

Then type

 yum -y install mysql-community-server

If this problem occurs during the download process

Then perform the following operations in sequence , The reason for the above prompt is Mysql Of GPG The upgrade , Need to reacquire
resolvent

 Execute first : rpm --import https://repo.mysql.com/RPM-GPG-KEY-mysql-2022
 Install the service again ：yum -y install mysql-server

Then you can wait for the service to download , Start the service after downloading

systemctl start mysqld

Then check the service status

systemctl status mysqld

If this is the display status, it indicates that the installation has been successful
Then use the command to view mysql The initial password for

grep 'temporary password' /var/log/mysqld.log 

Then enter the command to log in and prepare to modify mysql Password

Enter an instruction to find that the operation is not allowed , Will ask us to change the password

We enter instructions to change the password

ALTER USER 'root'@'localhost' IDENTIFIED BY 'Mysql020114.'

Set the password , The password here requires :
Both case and upper case exist
There are numbers
There are special characters

After successfully changing the password, your mysql The configuration is successful , You can enter an instruction to verify

Navicat Connect to mysql

Use the corresponding ip Address to connect , When testing the connection, if the connection fails , It may be because of the on your virtual machine mysql There is no operation to allow remote connection , The modification steps are as follows :
solve Navicat Unable to connect to... On the virtual machine mysql The way to

ERROR 1045 (28000): Access denied for user ‘root’@‘localhost’ (using password: YES)