Centos 7上安装MySQL出现错误

Transaction check error:
  file /etc/my.cnf from install of mysql-community-server-5.6.51-2.el7.x86_64 conflicts with file from package mariadb-config-3:10.1.20-2.el7ost.x86_64

rpm -e mariadb-config
error: Failed dependencies:
    /etc/my.cnf is needed by (installed) mariadb-common-3:10.1.20-2.el7ost.x86_64
(base) [ro@node3 ~]# rpm -e mariadb-common
error: Failed dependencies:
    mariadb-common(x86-64) = 3:10.1.20-2.el7ost is needed by (installed) mariadb-libs-3:10.1.20-2.el7ost.x86_64
(base) [ro@node3 ~]# rpm -e mariadb-libs
error: Failed dependencies:
    libmysqlclient.so.18()(64bit) is needed by (installed) postfix-2:2.10.1-9.el7.x86_64
    libmysqlclient.so.18()(64bit) is needed by (installed) MySQL-python-1.2.5-1.el7.x86_64
    libmysqlclient.so.18()(64bit) is needed by (installed) net-snmp-agent-libs-1:5.7.2-47.el7.x86_64
    libmysqlclient.so.18(libmysqlclient_18)(64bit) is needed by (installed) postfix-2:2.10.1-9.el7.x86_64
    libmysqlclient.so.18(libmysqlclient_18)(64bit) is needed by (installed) MySQL-python-1.2.5-1.el7.x86_64
    libmysqlclient.so.18(libmysqlclient_18)(64bit) is needed by (installed) net-snmp-agent-libs-1:5.7.2-47.el7.x86_64

 解决方法：

[rt@node3 ~]#  yum -y remove mariadb-config*

Removed:
  mariadb-config.x86_64 3:10.1.20-2.el7ost                                                                                        

Dependency Removed:
  MySQL-python.x86_64 0:1.2.5-1.el7                                                                                               
  keepalived.x86_64 0:1.3.5-16.el7                                                                                                
  mariadb-common.x86_64 3:10.1.20-2.el7ost                                                                                        
  mariadb-libs.x86_64 3:10.1.20-2.el7ost                                                                                          
  net-snmp-agent-libs.x86_64 1:5.7.2-47.el7                                                                                       
  openstack-neutron.noarch 1:12.0.2-0.20180421011362.0ec54fd.el7ost                                                               
  openstack-neutron-common.noarch 1:12.0.2-0.20180421011362.0ec54fd.el7ost                                                        
  openstack-neutron-openvswitch.noarch 1:12.0.2-0.20180421011362.0ec54fd.el7ost                                                   
  openstack-nova-common.noarch 1:17.0.3-0.20180420001141.el7ost                                                                   
  openstack-nova-compute.noarch 1:17.0.3-0.20180420001141.el7ost                                                                  
  openstack-nova-migration.noarch 1:17.0.3-0.20180420001141.el7ost                                                                
  postfix.x86_64 2:2.10.1-9.el7                                                                                                   
  python-neutron.noarch 1:12.0.2-0.20180421011362.0ec54fd.el7ost                                                                  
  python-nova.noarch 1:17.0.3-0.20180420001141.el7ost                                                                             
  python2-neutron-lib.noarch 0:1.13.0-1.el7ost                                                                                    
  python2-oslo-db.noarch 0:4.33.0-2.el7ost                                                                                        

Complete!