install mysql8.0 in centos system

Environmental description

• Operating system: CentOS Linux release 7.9.2009 (Core)
• The MySQL version installed this time: 8.0.26
• Connection tools: xshell, xftp (or other connection/upload tools)

start

1. Check whether there is MariaDB in centos7, please check the relationship between MariaDB and MySQL

rpm -qa | grep mariadb

2. If there is MariaDB, you need to uninstall all the mairadb queried in step 1, otherwise there will be problems with MySQL installation

rpm -e --nodeps 软件名

3. Check whether MySQL has been installed on this machine

rpm -qa | grep -i mysql

4. If you have installed MySQL, please confirm whether there is any data that needs to be backed up (if you have data that needs to be backed up, please refer to the relevant operations to back it up, otherwise you will not be responsible for data loss)

If MySQL has not been installed, please skip to step 6

5. Uninstall MySQL

• Uninstall all the mysql installation packages queried in step 3

rpm -e --nodeps 软件名

• Find the mysql file and delete it

find / -name mysql
whereis mysql

• Delete all the mysql files queried by the find command and whereis command

rm -rf 查询到的mysql路径

• delete mysql configuration file

rm /etc/my.cnf

• Confirm whether to delete all mysql

rpm -qa | grep -i mysql

6. Download the mysql installation package for centos7 from the MySQL official website

• Query whether the server is of x86_64 architecture or arm architecture

uname -m
或者是
arch
# 我的服务器是x86_64的

• Here you can download it directly through the browser, and then upload it to the server to be installed through ftp
• Or copy the link of this tar package, and then download it through the wget command, the operation is as follows

wget 文件的网络地址

• For example, the address I downloaded here is
  wget https://cdn.mysql.com//Downloads/MySQL-8.0/mysql-8.0.26-1.el7.x86_64.rpm-bundle.tar
  
  
• Either through xftp工具or wget命令, transfer the MySQL tar package to a certain directory of centos (such as the home directory), here is the uploaded root用户home directory
  

7. Unzip the tar package

Before decompressing, it is recommended to create an empty directory first, because multiple rpm packages will be directly placed in the current directory after the tar package is decompressed. Because my tar package is in the root user's home directory, I created a mysql directory directly in this directory. This directory does not matter!

tar -xvf mysql的tar包全名 -C 解压到指定目录
# 说明：-C参数，后面跟的是目录，意思是将压缩包解压缩后存放到指定的目录下。
# 这里就指定到刚才创建的mysql目录下

8. Start to install MySQL

• rpm install command

rpm -ivh xxx.rpm

The option here is to install all

The installation sequence is as follows, otherwise there will be dependency problems

rpm -ivh mysql-community-common-8.0.26-1.el7.x86_64.rpm
rpm -ivh mysql-community-client-plugins-8.0.26-1.el7.x86_64.rpm
rpm -ivh mysql-community-embedded-compat-8.0.26-1.el7.x86_64.rpm
rpm -ivh mysql-community-libs-8.0.26-1.el7.x86_64.rpm
rpm -ivh mysql-community-libs-compat-8.0.26-1.el7.x86_64.rpm
rpm -ivh mysql-community-devel-8.0.26-1.el7.x86_64.rpm
rpm -ivh mysql-community-client-8.0.26-1.el7.x86_64.rpm
rpm -ivh mysql-community-server-8.0.26-1.el7.x86_64.rpm
rpm -ivh mysql-community-test-8.0.26-1.el7.x86_64.rpm

• When installing rpm above, the dynamic library of centos may be missing, etc. Here are several error situations recorded

情况1：
[root@VM-0-14-centos mysql]# rpm -ivh mysql-community-embedded-compat-8.0.26-1.el7.x86_64.rpm

`warning: mysql-community-embedded-compat-8.0.26-1.el7.x86_64.rpm`:
   `Header V3 DSA/SHA256 Signature, key ID 5072e1f5: NOKEY error: Failed
   dependencies: libnuma.so.1()(64bit) is needed by
   mysql-community-embedded-compat-8.0.26-1.el7.x86_64
   libnuma.so.1(libnuma_1.1)(64bit) is needed by
   mysql-community-embedded-compat-8.0.26-1.el7.x86_64
   libnuma.so.1(libnuma_1.2)(64bit) is needed by
   mysql-community-embedded-compat-8.0.26-1.el7.x86_64

Solution:
yum -y install numactl

情况2
[root@VM-0-14-centos mysql]# rpm -ivh mysql-community-devel-8.0.26-1.el7.x86_64.rpm

warning: mysql-community-devel-8.0.26-1.el7.x86_64.rpm: Header V3 DSA/SHA256 Signature, key ID 5072e1f5: NOKEY
error: Failed dependencies:
pkgconfig(openssl) is needed by mysql-community-devel-8.0.26-1.el7.x86_64

The solution is
yum install openssl-devel

情况3
[root@VM-0-14-centos mysql]# rpm -ivh mysql-community-test-8.0.26-1.el7.x86_64.rpm

`warning: mysql-community-test-8.0.26-1.el7.x86_64.rpm: Header V3` `DSA/SHA256` `Signature, key ID 5072e1f5: NOKEY`
error: Failed dependencies:
perl(Data::Dumper) is needed by mysql-community-test-8.0.26-1.el7.x86_64

The solution is
yum -y install autoconf

情况4
[root@VM-0-14-centos mysql]# rpm -ivh mysql-community-test-8.0.26-1.el7.x86_64.rpm

warning: mysql-community-test-8.0.26-1.el7.x86_64.rpm: Header V3 DSA/SHA256 Signature, key ID 5072e1f5: NOKEY
error: Failed dependencies:
perl(JSON) is needed by mysql-community-test-8.0.26-1.el7.x86_64

Solution
yum install perl-JSON.noarch -y
yum install perl.x86_64 perl-devel.x86_64 -y

情况5
[root@VM-0-14-centos mysql]# rpm -ivh mysql-community-test-8.0.26-1.el7.x86_64.rpm

warning: mysql-community-test-8.0.26-1.el7.x86_64.rpm: Header V3 DSA/SHA256 Signature, key ID 5072e1f5: NOKEY
error: Failed dependencies:
perl(Test::More) is needed by mysql-community-test-8.0.26-1.el7.x86_64

Solution:
Go to https://pkgs.org/download/perl(Test::More), open the drop-down box of centos7, find the corresponding rpm under CentOS x86_64, then open the rpm link, and find Binary Package in the corresponding part of Download , there is a corresponding rpm download link at the back, just download it and install it.

或者用命令安装即可：yum install perl-Test-Harness

9. Initialize the database

mysqld --initialize --console

10. Directory authorization, otherwise it may fail to start

chown -R mysql:mysql /var/lib/mysql/

11. Start mysql

systemctl start mysqld

• The corresponding restart and shutdown mysql commands are as follows

systemctl stop mysqld
systemctl restart mysqld

12. Query mysql status

systemctl status mysqld

13. Query the temporary password of mysql

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

14. Use a temporary password to log in to mysql

mysql -u root -p

• Note: linux下输入密码是不会回显(It’s not that the computer is broken!), just press Enter after inputting
  - the password is entered correctly, and if you see the following information after pressing Enter, it means you have successfully entered mysql

15. Mysql login password

alter user ‘root’@‘localhost’ identified with mysql_native_password by ‘你的密码’ ;

Finally restart mysql

16. Mysql set remote connection

Note: This step is set according to actual needs

show databases ;
use mysql ;

View the host that can log in to mysql

select host, user from user;

host部分全部都是localhost, indicating that the user can only connect to the msyql service locally

• Modify the host value of the root user and refresh the mysql database

update user set user.host=’%'where user.user=‘root’;
flush privileges;

Use Navicat on my windows computer to test the connection to mysql on the server to see if it can be connected remotely

17. Other information

When the connection fails

• Does the firewall of centos7 open port 3306?
• Configuration of inbound and outbound rules for cloud servers