Scenario: Install phpmyadmin on CentOS 7

Steps:
1) Install epel repository
# yum install epel-release

2) Install and configure phpMyAdmin
# yum install phpmyadmin

Edit phpmyadmin.conf so we can access to phpMyAdmin, added your ip which will access phpMyAdmin,example in red font.
# vi /etc/httpd/conf.d/phpMyAdmin.conf

# phpMyAdmin - Web based MySQL browser written in php
#
# Allows only localhost by default
#
# But allowing phpMyAdmin to anyone other than localhost should be considered
# dangerous unless properly secured by SSL

Alias /phpMyAdmin /usr/share/phpMyAdmin
Alias /phpmyadmin /usr/share/phpMyAdmin

<Directory /usr/share/phpMyAdmin/>
 AddDefaultCharset UTF-8

 <IfModule mod_authz_core.c>
 # Apache 2.4
 <RequireAny>
 Require ip 192.168.99.99
 Require ip 127.0.0.1
 Require ip ::1
 </RequireAny>
 </IfModule>
 <IfModule !mod_authz_core.c>
 # Apache 2.2
 Order Deny,Allow
 Deny from All
 Allow from 192.168.99.99
 Allow from 127.0.0.1
 Allow from ::1
 </IfModule>
</Directory>

<Directory /usr/share/phpMyAdmin/setup/>
 <IfModule mod_authz_core.c>
 # Apache 2.4
 <RequireAny>
 Require ip 192.168.99.99
 Require ip 127.0.0.1
 Require ip ::1
 </RequireAny>
 </IfModule>
 <IfModule !mod_authz_core.c>
 # Apache 2.2
 Order Deny,Allow
 Deny from All
 Allow from 192.168.99.99
 Allow from 127.0.0.1
 Allow from ::1
 </IfModule>
</Directory>

# These directories do not require access over HTTP - taken from the original
# phpMyAdmin upstream tarball
#
<Directory /usr/share/phpMyAdmin/libraries/>
 Order Deny,Allow
 Deny from All
 Allow from None
</Directory>

<Directory /usr/share/phpMyAdmin/setup/lib/>
 Order Deny,Allow
 Deny from All
 Allow from None
</Directory>

<Directory /usr/share/phpMyAdmin/setup/frames/>
 Order Deny,Allow
 Deny from All
 Allow from None
</Directory>

# This configuration prevents mod_security at phpMyAdmin directories from
# filtering SQL etc. This may break your mod_security implementation.
#
#<IfModule mod_security.c>
# <Directory /usr/share/phpMyAdmin/>
# SecRuleInheritance Off
# </Directory>
#</IfModule>

3) Access phpMyAdmin by typing in browser http://[ipaddress or host]/phpmyadmin