Update

How to update yum repository mysql57-community-dmr --> mysql57-community

With mysql57-community-dmr installed, Conflict error occurs like

yum install http://dev.mysql.com/get/mysql57-community-release-el6-11.noarch.rpm

Setting up Install Process
mysql57-community-release-el6-11.noarch.rpm                                                                  |  25 kB     00:00     
Examining /var/tmp/yum-root-dWCjk3/mysql57-community-release-el6-11.noarch.rpm: mysql57-community-release-el6-11.noarch
Marking /var/tmp/yum-root-dWCjk3/mysql57-community-release-el6-11.noarch.rpm to be installed
Resolving Dependencies
--> Running transaction check
---> Package mysql57-community-release.noarch 0:el6-11 will be installed
--> Processing Conflict: mysql57-community-release-el6-11.noarch conflicts mysql-community-release
No package matched to upgrade: mysql57-community-release
--> Finished Dependency Resolution
Error: mysql57-community-release conflicts with mysql-community-release-el6-7.noarch
 You could try using --skip-broken to work around the problem
 You could try running: rpm -Va --nofiles --nodigest

Fix

yum-config-manager --disable mysql57-community-dmr

yum remove mysql-community-release-el6-7.noarch
yum install http://dev.mysql.com/get/mysql57-community-release-el6-11.noarch.rpm

yum-config-manager --enable mysql57-community

Background

Conoha Ruby on Rails template uses MySQL 5.1 as of March 2016
needs to be upgraded to the latest version MySQL 5.7 quickly !

Plan

from 5.1 to 5.7 : no direct in-place upgrade path available, so step wise...

5.1 -> 5.5 Upgrading MySQL http://dev.mysql.com/doc/refman/5.5/en/upgrading.html
5.5 -> 5.6 Upgrading MySQL http://dev.mysql.com/doc/refman/5.6/en/upgrading.html
5.6 -> 5.7 Upgrading MySQL http://dev.mysql.com/doc/refman/5.7/en/upgrading.html

Preliminary

【シンプル】CentOS6にMySQL5.7をyumで簡単にインストールする手順

http://blog.ybbo.net/2015/03/11/how-to-install-mysql5-7-to-centos6-using-yum/

Steps - How to upgrade

Environment

CentOS 6.7 installed (Red Hat Enterprise Linux Server 6.7)

/etc/issue

CentOS release 6.7 (Final)

yum repository for CentOS 6.x

yum install http://dev.mysql.com/get/mysql-community-release-el6-11.noarch.rpm

shutdown MySQL 5.1 for upgrade

mysql -u root -ppassword --execute="set global innodb_fast_shutdown=0"
mysqladmin -u root -ppassword shutdown

upgrade to MySQL 5.5

yum-config-manager --disable mysql56-community
yum-config-manager --enable mysql55-community
yum update mysql mysql-devel mysql-server mysql-utilities

mysqld_safe && mysql_upgrade - 5.5

mysqld_safe
mysql_upgrade -u root -ppassword
service mysqld stop

upgrade to MySQL 5.6

yum-config-manager --disable mysql55-community
yum-config-manager --enable mysql56-community
yum update mysql mysql-devel mysql-server mysql-utilities

mysqld_safe && mysql_upgrade - 5.6

mysqld_safe
mysql_upgrade -u root -ppassword
service mysqld stop

upgrade to MySQL 5.7

yum-config-manager --disable mysql56-community
yum-config-manager --enable mysql57-community
yum update mysql mysql-devel mysql-server mysql-utilities

mysqld_safe && mysql_upgrade - 5.7

mysqld_safe
mysql_upgrade -u root -ppassword
service mysqld stop

Fin

mysql --version
mysql  Ver 14.14 Distrib 5.7.12, for Linux (x86_64)

Done