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
- 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
- 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
- 检测系统是否存在mysql
yum list installed | grep mysql
- 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
- 安装mysql 服务器
# yum install mysql-community-server
终于没有报错，可以继续了
