一、問題簡單描述

騰訊雲CentOS7在用yum安裝mysql時，參考mysql的官方文件安裝（見最後的附錄），出現了這樣的問題：

二、原因：

1. Go to the Download MySQL Yum Repository page in the MySQL Developer Zone.
   mysql的yun源下載地址

2. Select and download the release package for your platform.
   

3. Install the downloaded release package with the following command
   （1）下載完成後，用SSH Secure File Transfer Client等工具將下載的rpm包上傳到雲伺服器上。接著進入到mysql57-community-release-el7-9.noarch.rpm包所在的資料夾，執行下面的命令：
   [

   [email protected] centos local]# sudo rpm -Uvh mysql57-community-release-el7-9.noarch.rpm
   （2）之後，進入yum源的配置資料夾：
   [[email protected] centos local]# cd /etc/yum.repos.d/
   [[email protected] centos local]# ls
   會發現，多出了兩個mysql的yun源配置
   
   備註：yum的配置一般有兩種方式，一種是直接配置/etc目錄下的yum.conf檔案，另外一種是在/etc/yum.repos.d目錄下增加.repo檔案。

4. 問題來了
   安裝了mysql的yum源後，整個yum源都出了問題。
   （1）例如：執行
   [[email protected] centos local]#yum repolist all | grep mysql
   會出現下面圖中的問題
   
   （2）執行下面命令，安裝的是其他軟體包，仍然出現同樣的問題。推測一下，應該是該mysql的yum源有問題，導致了整個yum源出錯了。
   [[email protected] centos local]#yum install libaio
   同樣也會出現下面圖中的問題
   

5. 總結：騰訊雲CentOS7用yum源安裝mysql的方法行不通

三、解決方法

分兩個步驟：一是刪除已配置mysql的yum源；二是用tar方法安裝mysql（詳細看我的另一篇文章）
1. 刪除剛剛配置的mysql的yum源
[[email protected] centos yum.repos.d]# yum remove mysql57-community-release-el7-9.noarch

1. 進入yum源的配置資料夾，檢視一下
   [[email protected] centos local]# cd /etc/yum.repos.d/
   [[email protected] centos local]# ls
   可以發現，mysql的yum源別刪除了：
   

2. 此時再次安裝其他軟體包，可以看到恢復正常了。
   

附錄：linux上用yum安裝mysql的官方文件摘錄

A Quick Guide to Using the MySQL Yum Repository

Abstract

The MySQL Yum repository provides RPM packages for installing the MySQL server, client, and other components on Linux platforms. The packages also upgrade and replace any third-party MySQL packages installed from the Linux distros’ native software repositories, if replacements for them are available from MySQL.

The MySQL Yum repository supports the following Linux platforms :

EL5-, EL6-, and EL7-based platforms (for example, the corresponding versions of Red Hat Enterprise Linux, Oracle Linux, and CentOS)

Fedora 23 and 24

This is a quick guide to using the MySQL Yum repository. For more information, see Further Readings.

For legal information, see the Legal Notices.

For help with using MySQL, please visit either the MySQL Forums or MySQL Mailing Lists, where you can discuss your issues with other MySQL users.

For additional documentation on MySQL products, including translations of the documentation into other languages, and downloadable versions in variety of formats, including HTML and PDF formats, see the MySQL Documentation Library.

Document generated on: 2016-10-05 (revision: 49311)

Steps for a Fresh Installation of MySQL

Note：
The following instructions assume that MySQL is not already installed on your system using a third-party-distributed RPM package; if that is not the case, follow the instructions given in Replacing a Native Third-Party Distribution of MySQL.

1、Adding the MySQL Yum Repository
First, add the MySQL Yum repository to your system’s repository list. Follow these steps:

Select and download the release package for your platform.

Install the downloaded release package with the following command, replacing platform-and-version-specific-package-name with the name of the downloaded package:

shell> sudo rpm -Uvh platform-and-version-specific-package-name.rpm
For example, for version n of the package for EL6-based systems, the command is:

shell> sudo rpm -Uvh mysql57-community-release-el6-n.noarch.rpm
Note
Once the release package is installed on your system, any system-wide update by the yum update command (or dnf upgrade for dnf-enabled systems) will automatically upgrade MySQL packages on your system and also replace any native third-party packages, if Yum finds replacements for them in the MySQL Yum repository. See Upgrading MySQL with the MySQL Yum Repository and Replacing a Native Third-Party Distribution of MySQL for details.

2、Selecting a Release Series
When using the MySQL Yum repository, the latest GA release of MySQL is selected for installation by default. If this is what you want, you can skip to the next step, Installing MySQL with Yum.

Within the MySQL Yum repository (http://repo.mysql.com/yum/), different release series of the MySQL Community Server are hosted in different subrepositories. The subrepository for the latest GA series (currently MySQL 5.7) is enabled by default, and the subrepositories for all other series (for example, the MySQL 5.6 series) are disabled by default. Use this command to see all the subrepositories in the MySQL Yum repository, and see which of them are enabled or disabled (for dnf-enabled systems, replace yum in the command with dnf):

shell> yum repolist all | grep mysql

3、Installing MySQL

Install MySQL by the following command (for dnf-enabled systems, replace yum in the command with dnf):

shell> sudo yum install mysql-community-server
This installs the package for the MySQL server, as well as other required packages.

4、Starting the MySQL Server

Start the MySQL server with the following command:

shell> sudo service mysqld start
You can check the status of the MySQL server with the following command:

shell> sudo service mysqld status