yum install mysql-community-serv

该解决方案为卸载重装；如果看客不能卸载，请直接关闭

系统：Centos 6.9
MySQL 版本：MySQL 5.7

由于本人以前买了个 Centos 6.9 国外服务器玩并安装了mysql；后来因为忙所以就把服务器搁置了，最近闲下来又开始捣鼓起来。
最开始忘记 mysql 的配置信息，所以想要更新下 mysql；按照网上的方式使用；但是再输入如下指令的
yum install mysql-community-server
结果报如下错误：

[root@host ~]# yum install mysql-community-server
Loaded plugins: fastestmirror
Setting up Install Process
Loading mirror speeds from cached hostfile
 * base: mirror.san.fastserv.com
 * elrepo-kernel: repos.lax-noc.com
 * extras: mirrors.oit.uci.edu
 * updates: mirror.keystealth.org
Resolving Dependencies
--> Running transaction check
---> Package mysql-community-server.x86_64 0:5.7.20-1.el7 will be installed
--> Processing Dependency: mysql-community-common(x86-64) = 5.7.20-1.el7 for package: mysql-community-server-5.7.20-1.el7.x86_64
--> Processing Dependency: mysql-community-client(x86-64) >= 5.7.9 for package: mysql-community-server-5.7.20-1.el7.x86_64
--> Processing Dependency: systemd for package: mysql-community-server-5.7.20-1.el7.x86_64
--> Processing Dependency: systemd for package: mysql-community-server-5.7.20-1.el7.x86_64
--> Processing Dependency: libstdc++.so.6(GLIBCXX_3.4.15)(64bit) for package: mysql-community-server-5.7.20-1.el7.x86_64
--> Processing Dependency: libnuma.so.1(libnuma_1.2)(64bit) for package: mysql-community-server-5.7.20-1.el7.x86_64
--> Processing Dependency: libnuma.so.1(libnuma_1.1)(64bit) for package: mysql-community-server-5.7.20-1.el7.x86_64
--> Processing Dependency: libc.so.6(GLIBC_2.17)(64bit) for package: mysql-community-server-5.7.20-1.el7.x86_64
--> Processing Dependency: libsasl2.so.3()(64bit) for package: mysql-community-server-5.7.20-1.el7.x86_64
--> Processing Dependency: libnuma.so.1()(64bit) for package: mysql-community-server-5.7.20-1.el7.x86_64
--> Running transaction check
---> Package mysql-community-client.x86_64 0:5.7.20-1.el7 will be installed
--> Processing Dependency: mysql-community-libs(x86-64) >= 5.7.9 for package: mysql-community-client-5.7.20-1.el7.x86_64
--> Processing Dependency: libstdc++.so.6(GLIBCXX_3.4.15)(64bit) for package: mysql-community-client-5.7.20-1.el7.x86_64
--> Processing Dependency: libc.so.6(GLIBC_2.14)(64bit) for package: mysql-community-client-5.7.20-1.el7.x86_64
---> Package mysql-community-common.x86_64 0:5.7.20-1.el7 will be installed
---> Package mysql-community-server.x86_64 0:5.7.20-1.el7 will be installed
--> Processing Dependency: systemd for package: mysql-community-server-5.7.20-1.el7.x86_64
--> Processing Dependency: systemd for package: mysql-community-server-5.7.20-1.el7.x86_64
--> Processing Dependency: libstdc++.so.6(GLIBCXX_3.4.15)(64bit) for package: mysql-community-server-5.7.20-1.el7.x86_64
--> Processing Dependency: libc.so.6(GLIBC_2.17)(64bit) for package: mysql-community-server-5.7.20-1.el7.x86_64
--> Processing Dependency: libsasl2.so.3()(64bit) for package: mysql-community-server-5.7.20-1.el7.x86_64
---> Package numactl.x86_64 0:2.0.9-2.el6 will be installed
--> Running transaction check
---> Package mysql-community-client.x86_64 0:5.7.20-1.el7 will be installed
--> Processing Dependency: libstdc++.so.6(GLIBCXX_3.4.15)(64bit) for package: mysql-community-client-5.7.20-1.el7.x86_64
--> Processing Dependency: libc.so.6(GLIBC_2.14)(64bit) for package: mysql-community-client-5.7.20-1.el7.x86_64
---> Package mysql-community-libs.x86_64 0:5.7.20-1.el7 will be installed
--> Processing Dependency: libc.so.6(GLIBC_2.14)(64bit) for package: mysql-community-libs-5.7.20-1.el7.x86_64
---> Package mysql-community-server.x86_64 0:5.7.20-1.el7 will be installed
--> Processing Dependency: systemd for package: mysql-community-server-5.7.20-1.el7.x86_64
--> Processing Dependency: systemd for package: mysql-community-server-5.7.20-1.el7.x86_64
--> Processing Dependency: libstdc++.so.6(GLIBCXX_3.4.15)(64bit) for package: mysql-community-server-5.7.20-1.el7.x86_64
--> Processing Dependency: libc.so.6(GLIBC_2.17)(64bit) for package: mysql-community-server-5.7.20-1.el7.x86_64
--> Processing Dependency: libsasl2.so.3()(64bit) for package: mysql-community-server-5.7.20-1.el7.x86_64
--> Finished Dependency Resolution
Error: Package: mysql-community-server-5.7.20-1.el7.x86_64 (mysql57-community)
           Requires: libsasl2.so.3()(64bit)
Error: Package: mysql-community-client-5.7.20-1.el7.x86_64 (mysql57-community)
           Requires: libstdc++.so.6(GLIBCXX_3.4.15)(64bit)
Error: Package: mysql-community-libs-5.7.20-1.el7.x86_64 (mysql57-community)
           Requires: libc.so.6(GLIBC_2.14)(64bit)
Error: Package: mysql-community-server-5.7.20-1.el7.x86_64 (mysql57-community)
           Requires: systemd
Error: Package: mysql-community-server-5.7.20-1.el7.x86_64 (mysql57-community)
           Requires: libstdc++.so.6(GLIBCXX_3.4.15)(64bit)
Error: Package: mysql-community-client-5.7.20-1.el7.x86_64 (mysql57-community)
           Requires: libc.so.6(GLIBC_2.14)(64bit)
Error: Package: mysql-community-server-5.7.20-1.el7.x86_64 (mysql57-community)
           Requires: libc.so.6(GLIBC_2.17)(64bit)
 You could try using --skip-broken to work around the problem
 You could try running: rpm -Va --nofiles --nodigest

查询各种信息；基本确定是因为 mysql 的依赖问题；由于对本来说，最快的解决方案就是卸载重装.

卸载方法：

1.快速删除

yum remove  mysql mysql-server mysql-libs mysql-server

2.查找残留文件

rpm -qa | grep -i mysql

3. 将查询出来的文件逐个删除，如：

yum remove mysql-community-common-5.7.20-1.el6.x86_64

4.查找残留目录

whereis mysql

5. 逐条删除目录，如：

rm –rf /usr/lib64/mysql

上述做完后，最好重新查询相关内容，防止漏删

安装：

转自https://segmentfault.com/a/1190000003049498

1. 检测系统是否存在mysql

yum list installed | grep mysql

2. 删除mysql依赖项

yum -y remove mysql-libs.x86_64

3.给CentOS添加rpm源，并且选择较新的源

wget dev.mysql.com/get/mysql-community-release-el6-5.noarch.rpm
yum localinstall mysql-community-release-el6-5.noarch.rpm
yum repolist all | grep mysql
yum-config-manager --disable mysql55-community
yum-config-manager --disable mysql56-community
yum-config-manager --enable mysql57-community-dmr
yum repolist enabled | grep mysql

4. 安装mysql 服务器

# yum install mysql-community-server

终于没有报错，可以继续了