Postgresql installation issue

Hi,

I am trying to install postgre into my linux machine (Linux
ip-172-31-35-138 4.9.70-22.55.amzn1.x86_64 #1 SMP Wed Dec 20 23:36:28 UTC
2017 x86_64 x86_64 x86_64 GNU/Linux),

I have downloaded the pgdg-redhat10-10-2.noarch.rpm

first of all I don't find this below configuration file:

/etc/yum/pluginconf.d/rhnplugin.conf

[ec2-user(at)ip-172-31-35-138 ~]$ ls /etc/yum/pluginconf.d
priorities.conf update-motd.conf upgrade-helper.conf

I ran, sudo yum install pgdg-redhat10-10-2.noarch.rpm.----------------->
successfully completed

I am getting the error for these below commands:
Install the client packages:
yum install postgresql10
Optionally install the server packages:
yum install postgresql10-server
Optionally initialize the database and enable automatic start:
service postgresql-10 initdb
chkconfig postgresql-10 on
service postgresql-10 start

I am getting an below error, while executing the above commands:
[ec2-user(at)ip-172-31-35-138 ~]$ sudo yum install postgresql10
Loaded plugins: priorities, update-motd, upgrade-helper
amzn-main | 2.1 kB 00:00:00
amzn-updates | 2.5 kB 00:00:00
https://download.postgresql.org/pub/repos/yum/10/redhat/rhel-latest-x86_64/repodata/repomd.xml:
[Errno 14] HTTPS Error 404 - Not Found
Trying other mirror.
To address this issue please refer to the below knowledge base article

https://access.redhat.com/articles/1320623

If above article doesn't help to resolve this issue please open a ticket
with Red Hat Support.

One of the configured repositories failed (PostgreSQL 10 latest -
x86_64),
and yum doesn't have enough cached data to continue. At this point the
only
safe thing yum can do is fail. There are a few ways to work "fix" this:

1. Contact the upstream for the repository and get them to fix the
problem.

2. Reconfigure the baseurl/etc. for the repository, to point to a
working
upstream. This is most often useful if you are using a newer
distribution release than is supported by the repository (and the
packages for the previous distribution release still work).

3. Disable the repository, so yum won't use it by default. Yum will
then
just ignore the repository until you permanently enable it again
or use
--enablerepo for temporary usage:

yum-config-manager --disable pgdg10

4. Configure the failing repository to be skipped, if it is
unavailable.
Note that yum will try to contact the repo. when it runs most
commands,
so will have to try and fail each time (and thus. yum will be be
much
slower). If it is a very temporary problem though, this is often a
nice
compromise:

yum-config-manager --save
--setopt=pgdg10.skip_if_unavailable=true

failure: repodata/repomd.xml from pgdg10: [Errno 256] No more mirrors to
try.
https://download.postgresql.org/pub/repos/yum/10/redhat/rhel-latest-x86_64/repodata/repomd.xml:
[Errno 14] HTTPS Error 404 - Not Found

Thanks
tabassum