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MSYQL is abnormal. Don't worry. Mr. Allen will point out the puzzle

2022-06-28 23:53:00 【Software testing】

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In the performance test , Database performance issues , It could take up 70%, So performance testing , Database is a very, very important knowledge . however , I've been talking about MySQL When it comes to databases , But I met an embarrassment .
We have classes , Yes, all students are required to install it by themselves MySQL Database , although , There are many ways to install , however , Use yum Command to install , It is also something that every student must master , therefore , When I was in class , Use the common used in previous classes yum Command to install mysql5.7 edition

wget http://dev.mysql.com/get/mysql57-community-release-el7-10.noarch.rpm
rpm -Uvh http://dev.mysql.com/get/mysql57-community-release-el7-10.noarch.rpm
yum install mysql-community-server -y

Results the execution result told me that the installation failed ：

It has been successfully installed before , But now it can't be installed .

What's going on? ？

result , Let me find this ：

What do you mean by that ？ That is to say 2022 year 1 month 18 Japan ,MySQL Released 5.7.37 edition , Updated the secret key , The original secret key can only support 2022 year 2 month 16 Japan , in other words , If you don't pay attention to this message , Yours MySQL May be in 2022 year 2 month 16 In the future , It may not work properly .

Use yum Command to install , Will be installed to the latest mysql5.7.37 Version up , Result key error , Installation did not succeed .

Now? , There's a problem , How to solve this problem ？

Tips： The following method , All new installations MySQL, therefore , I don't have to back up the database , If , you are here 2022 year 2 month 16 In the future , See this article , Or your MySQL There's something wrong with the database , Please back up the database first . Develop good habits .

** Method 1 ：** uninstall mysql57 Of noarch package , install mysql80 Of noarch package , Get the secret key

First , Uninstall the installed “mysql57-community-release”

rpm -e mysql57-community-release

then , install mysql80-community-release

wget https://dev.mysql.com/get/mysql80-community-release-el7-5.noarch.rpm
rpm -Uvh mysql80-community-release-el7-5.noarch.rpm

because , What we want to install is mysql5.7 Version of , Do not want to install mysql8, therefore , We need to change yum Installed by default MySQL edition .

# yum repolist all | grep mysql 
#  This command , You can view the current , default mysql edition , The result is enabled , Is the default version 

#  Method 1 ：
yum-config-manager --disable mysql80-community
yum-config-manager --enable mysql57-community
#  This method is simple , however , Some systems , No, yum-config-manager command 

#  Method 2 ：
vim /etc/yum.repos.d/mysql-community.repo

[mysql57-community]
name=MySQL 5.7 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.7-community/el/7/$basearch
enabled=0  #  Change this to 1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql-2022
       file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

[mysql80-community]
name=MySQL 8.0 Community Server
baseurl=http://repo.mysql.com/yum/mysql-8.0-community/el/7/$basearch
enabled=1  #  Change this to 0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql-2022
       file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

# enable by 0  For disable , 1 On behalf of enable 
#  After modification and saving , Re execution  yum repolist all | grep mysql  You can see the default mysql The version is 57

After doing the above , You can install it directly mysql57 了

yum install mysql-community-server -y

See this picture , Are you happy , Perfect solution ,mysql5.7.37 edition , Installation successful .

** Method 2 ：** Use mysql80 Of noarch package , To get the key , Then install mysql57

This method , And the 1 Methods , Difference is Less execution uninstall mysql57-community-release, This step .

** Method 3 ：** Use mysql80 The key of , Replace the current key

Upload ‘RPM-GPG-KEY-mysql-2022’ ‘RPM-GPG-KEY-mysql’ File to /etc/pki/rpm-gpg Under the path .

then , modify mysql-community.repo The configuration file

#  Method 1 ：
yum-config-manager --disable mysql80-community
yum-config-manager --enable mysql57-community
#  This method is simple , however , Some systems , No, yum-config-manager command 

#  Method 2 ：
vim /etc/yum.repos.d/mysql-community.repo

[mysql57-community]
name=MySQL 5.7 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.7-community/el/7/$basearch
enabled=0  #  Change this to 1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql-2022
       file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

# enable by 0  For disable , 1 On behalf of enable

Next , It is directly installed

yum install mysql-community-server -y

ok, Perfect solution , Three ways to , I can do it practically , Have you encountered the above problems , If you encounter it, go and try it ！

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