I down loaded Centos 7, next in the terminal, I installed "Epel" so I could install DNF. Next I went to update/upgrade the system.
 

I down loaded Centos 7, next in the terminal, I installed "Epel" so I could install DNF. Next I went to update/upgrade the system and got this message below...What does it mean and how do I fix it? I also downloaded Google Chrome doing this process. It shouldn't matter...or?

## Failed to open: /var/cache/dnf/x86_64/7/x86_64/7/epel/repodata/b3221500eaedf45b7ec0737a410cde7e3f09b49070c729449938b961ccbdf397-updateinfo.xml.bz2.

yum repolist
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
* base: mirror.5ninesolutions.com
* epel: reflector.westga.edu
* extras: reflector.westga.edu
* updates: repos.mia.quadranet.com
repo id repo name status
adobe-linux-x86_64 Adobe Systems Incorporated 2
base/7/x86_64 CentOS-7 - Base 9,007
epel/x86_64 Extra Packages for Enterprise Linux 7 - x86_64 10,052
extras/7/x86_64 CentOS-7 - Extras 303
google-chrome google-chrome 3
updates/7/x86_64 CentOS-7 - Updates 1,676
repolist: 21,043

# yum info nagios
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
* base: mirror.5ninesolutions.com
* epel: reflector.westga.edu
* extras: reflector.westga.edu
* updates: repos.mia.quadranet.com
Available Packages
Name : nagios
Arch : x86_64
Version : 4.0.8
Release : 2.el7
Size : 1.5 M
Repo : epel/x86_64
Summary : Host/service/network monitoring program
URL : http://www.nagios.org/
License : GPLv2
Description : Nagios is a program that will monitor hosts and services on your
: network. It has the ability to send email or page alerts when a
: problem arises and when a problem is resolved. Nagios is written
: in C and is designed to run under Linux (and some other *NIX
: variants) as a background process, intermittently running checks
: on various services that you specify.
:
: The actual service checks are performed by separate "plugin" programs
: which return the status of the checks to Nagios. The plugins are
: available at https://github.com/nagios-plugins/nagios-plugins
:
: This package provides the core program, web interface, and documentation
: files for Nagios. Development files are built as a separate package.

This might be too much info...Sorry

Try to read here:
https://wiki.centos.org/FAQ/General