Trouble installing postix on system with MySQL

[Ben_PDX]

I am trying to install postfix on a CentOS 7 system that already has MySQL 5.6 installed. The postfix installation process needs to install libmysqlclient.so.18 as a dependency. In order to get this dependency, yum is trying to install mariadb-libs, but is being prevented from doing so because it is not allowed by MySQL-shared-compat:

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--> Running transaction check
---> Package mariadb-libs.x86_64 1:5.5.37-1.el7_0 will be installed
--> Processing Dependency: libmysqlclient.so.18(libmysqlclient_18)(64bit) for package: 2:postfix-2.10.1-6.el7.x86_64
--> Processing Dependency: libmysqlclient.so.18()(64bit) for package: 2:postfix-2.10.1-6.el7.x86_64
--> Running transaction check
---> Package mariadb-libs.x86_64 1:5.5.35-3.el7 will be installed
Removing mariadb-libs.x86_64 1:5.5.35-3.el7 - u due to obsoletes from installed MySQL-shared-compat-5.6.20-1.el7.x86_64
--> Restarting Dependency Resolution with new changes.

If we don't want to replace MySQL with MariaDB (or damage the MySQL installation), what can I do to get postfix installed?

[TrevorH]

You don't. This is why we support only packages supplied by CentOS. CentOS's postfix works perfectly with the supplied mariadb. You'll have to ask the people that supplied your MySQL 5.6 why it doesn't work with other CentOS packages,

[rich_PDX]

if you are using rpms for rpm bundle, dont forget to install MySQL-shared. This worked for me:

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bash> sudo wget http://ftp.kaist.ac.kr/mysql/Downloads/MySQL-5.6/MySQL-5.6.21-1.el7.x86_64.rpm-bundle.tar
bash> sudo tar -xvf MySQL-5.6.21-1.el7.x86_64.rpm-bundle.tar
sudo yum localinstall MySQL-shared-compat-5.6.21-1.el7.x86_64.rpm MySQL-shared-5.6.21-1.el7.x86_64.rpm MySQL-server-5.6.21-1.el7.x86_64.rpm MySQL-devel-5.6.21-1.el7.x86_64.rpm MySQL-client-5.6.21-1.el7.x86_64.rpm

Upon that yum should get something:

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Dependency Installed:
  mysql-community-common.x86_64 0:5.6.21-2.el7                                                                                                                            

Replaced:
  mariadb-libs.x86_64 1:5.5.37-1.el7_0          

which would replace the mariadb lib that postfix wants w/ mysql-common which wont affect the installation of postfix.