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阿里云，CentOS Linux release 7.4.1708，安装mysql5.7.20，报如下异常：
[root@zhangcool-cooler01 mysql-5.7]# rpm -ivh mysql-community-common-5.7.20-1.el6.x86_64.rpm
warning: mysql-community-common-5.7.20-1.el6.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Preparing... ################################# [100%]
file /usr/share/mysql/czech/errmsg.sys from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/danish/errmsg.sys from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/dutch/errmsg.sys from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/english/errmsg.sys from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/estonian/errmsg.sys from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/french/errmsg.sys from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/german/errmsg.sys from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/greek/errmsg.sys from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/hungarian/errmsg.sys from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/italian/errmsg.sys from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/japanese/errmsg.sys from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/korean/errmsg.sys from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/norwegian-ny/errmsg.sys from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/norwegian/errmsg.sys from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/polish/errmsg.sys from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/portuguese/errmsg.sys from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/romanian/errmsg.sys from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/russian/errmsg.sys from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/serbian/errmsg.sys from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/slovak/errmsg.sys from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/spanish/errmsg.sys from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/swedish/errmsg.sys from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/ukrainian/errmsg.sys from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/charsets/Index.xml from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/charsets/armscii8.xml from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/charsets/ascii.xml from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/charsets/cp1250.xml from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/charsets/cp1256.xml from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/charsets/cp1257.xml from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/charsets/cp850.xml from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/charsets/cp852.xml from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/charsets/cp866.xml from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/charsets/dec8.xml from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/charsets/geostd8.xml from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/charsets/greek.xml from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/charsets/hebrew.xml from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/charsets/hp8.xml from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/charsets/keybcs2.xml from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/charsets/koi8r.xml from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/charsets/koi8u.xml from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/charsets/latin1.xml from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/charsets/latin2.xml from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/charsets/latin5.xml from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/charsets/latin7.xml from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/charsets/macce.xml from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/charsets/macroman.xml from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
file /usr/share/mysql/charsets/swe7.xml from install of mysql-community-common-5.7.20-1.el6.x86_64 conflicts with file from package mariadb-libs-1:5.5.56-2.el7.x86_64
仔细看提示信息，是mariadb-libs-1:5.5.56-2.el7.x86_64包冲突了。把它缷掉即可。
[root@zhangcool-cooler01 mysql-5.7]# rpm -e mariadb-libs-1:5.5.56-2.el7.x86_64 --nodeps
[root@zhangcool-cooler01 mysql-5.7]#
[root@zhangcool-cooler01 mysql-5.7]# rpm -ivh mysql-community-common-5.7.20-1.el6.x86_64.rpm
warning: mysql-community-common-5.7.20-1.el6.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Preparing... ################################# [100%]
Updating / installing...
1:mysql-community-common-5.7.20-1.e################################# [100%]
[root@zhangcool-cooler01 mysql-5.7]#