install mysql 5.7 to linux 6 - yum tries to install 5.7 el7?

Question

I'm following the instructions here to install MySQL-Community-Server onto a linux 6 aws instance.

Basic commands:
wget http://dev.mysql.com/get/mysql57-community-release-el6-8.noarch.rpm
sudo yum localinstall mysql57-community-release-el6-8.noarch.rpm

then when I search for mysql57 within my 'new' yum repo with yum list all |grep mysql57 i get the following:

mysql57-community-release.noarch       el6-8                        @/mysql57-community-release-el6-8.noarch
mysql-community-client.i686            5.7.13-1.el7                 mysql57-community
mysql-community-client.x86_64          5.7.13-1.el7                 mysql57-community
mysql-community-common.i686            5.7.13-1.el7                 mysql57-community
mysql-community-common.x86_64          5.7.13-1.el7                 mysql57-community
mysql-community-devel.i686             5.7.13-1.el7                 mysql57-community
mysql-community-devel.x86_64           5.7.13-1.el7                 mysql57-community
mysql-community-embedded.i686          5.7.13-1.el7                 mysql57-community
mysql-community-embedded.x86_64        5.7.13-1.el7                 mysql57-community
mysql-community-embedded-compat.i686   5.7.13-1.el7                 mysql57-community
mysql-community-embedded-compat.x86_64 5.7.13-1.el7                 mysql57-community
mysql-community-embedded-devel.i686    5.7.13-1.el7                 mysql57-community
mysql-community-embedded-devel.x86_64  5.7.13-1.el7                 mysql57-community
mysql-community-libs.i686              5.7.13-1.el7                 mysql57-community
mysql-community-libs.x86_64            5.7.13-1.el7                 mysql57-community
mysql-community-libs-compat.i686       5.7.13-1.el7                 mysql57-community
mysql-community-libs-compat.x86_64     5.7.13-1.el7                 mysql57-community
mysql-community-release.noarch         el7-7                        mysql57-community
mysql-community-server.x86_64          5.7.13-1.el7                 mysql57-community
mysql-community-test.x86_64            5.7.13-1.el7                 mysql57-community
mysql57-community-release.noarch       el7-7                        mysql57-community

so it appears that the el6-8 link is installing references to el7 ???

when I try to install mysql with sudo yum install mysql i get the following errors

Downloading packages:
http://repo.mysql.com/yum/mysql-5.7-community/el/6/x86_64/mysql-community-client-5.7.13-1.el7.x86_64.rpm: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"
Trying other mirror.
http://repo.mysql.com/yum/mysql-5.7-community/el/6/x86_64/mysql-community-common-5.7.13-1.el7.x86_64.rpm: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"
Trying other mirror.
http://repo.mysql.com/yum/mysql-5.7-community/el/6/x86_64/mysql-community-libs-5.7.13-1.el7.x86_64.rpm: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"
Trying other mirror.

when I try sudo yum install mysql-community-server i get error:

Error: Package: mysql-community-server-5.7.13-1.el7.x86_64 (mysql57-community)
           Requires: systemd

...which is a common error when trying to install el7 on el6 linux (which doesn't use systemd)

In both cases yum is trying to download the el7 package from the el6-8 repo...

how do I correct this ?

PS I've tried editing the /etc/yum.repos.d/mysql-community.repo file but there's nothing that specifies the linux version
PPS I've also completely uninstalled the yum repo and tried yum clean all - then check yum list all |grep mysql57 which gives no results - followed by a fresh install = same result

UPDATE
the contents of my /etc/yum.repos.d/mysql-community.repo file confirms that the repo is set up to load el6 mysql:

[mysql-connectors-community]
name=MySQL Connectors Community
baseurl=http://repo.mysql.com/yum/mysql-connectors-community/el/6/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

[mysql-tools-community]
name=MySQL Tools Community
baseurl=http://repo.mysql.com/yum/mysql-tools-community/el/6/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

# Enable to use MySQL 5.5
[mysql55-community]
name=MySQL 5.5 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.5-community/el/6/$basearch/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

# Enable to use MySQL 5.6
[mysql56-community]
name=MySQL 5.6 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.6-community/el/6/$basearch/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

[mysql57-community]
name=MySQL 5.7 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.7-community/el/6/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

[mysql-tools-preview]
name=MySQL Tools Preview
baseurl=http://repo.mysql.com/yum/mysql-tools-preview/el/6/$basearch/
enabled=0
gpgcheck=1
gpgkey=file:/etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

Answer 1

I had this problem too and it took me days to figure out. I, too, thought I was on an EL 7 OS, but I was on 6. I tried to install MySQL EL7 package and received the errors about needing systemd. This was the first clue that the package was incorrect.

I removed the EL7 packages with

sudo yum remove mysql57-community-release-el7-9.noarch

and installed EL6, but when running

sudo yum install mysql-community-server

it defaulted back to installing EL7 packages. I checked my /etc/yum.repos.d/mysql-community.repo, but all of that pointed to 6, not 7.

After days of fighting with this,

sudo yum clean all 

and

sudo yum update 

fixed the problem. After that, sudo yum install mysql-community-server worked perfectly.