How to install phpmyadmin on Linux Centos 7

ssh into your centos 7 box, using root (assuming your centos box ip is 10.0.0.100)

# ssh root@10.0.0.100

Install apache web server (httpd)

# yum install httpd

Install php, and php-mysql

# yum install php php-myqsl

Start apache webserver

# systemctl start httpd

Install mariadb-server

# yum install mariadb-server

Start mariadb-server

# systemctl start mariadb

Secure mariadb-server installation (will set root password, and secure mariadb-server installation)

# mysql_secure_installation 

Install epel repo (epel stands for extra package for enterprise linux) 

# yum install epel-release 

Install phpmyadmin
# yum install phpmyadmin

Set phpmyadmin to allow ip from local lan (in this case, the local lan ip segment is 10.0.0.0/24), by changing below lines in /etc/httpd/conf.d/phpMyAdmin.conf
# diff -u phpMyAdmin.conf /etc/httpd/conf.d/phpMyAdmin.conf 
--- phpMyAdmin.conf     2017-07-13 19:24:52.310000000 +0800
+++ /etc/httpd/conf.d/phpMyAdmin.conf   2017-07-13 19:15:50.366000000 +0800
@@ -14,7 +14,7 @@
    
      # Apache 2.4
      
-       Require ip 127.0.0.1
+       Require ip 10.0.0
        Require ip ::1
      
    
@@ -22,7 +22,7 @@
      # Apache 2.2
      Order Deny,Allow
      Deny from All
-     Allow from 127.0.0.1
+     Allow from 10.0.0
      Allow from ::1

@@ -31,7 +31,7 @@
    
      # Apache 2.4
      
-       Require ip 127.0.0.1
+       Require ip 10.0.0
        Require ip ::1
      
    
@@ -39,7 +39,7 @@
      # Apache 2.2
      Order Deny,Allow
      Deny from All
-     Allow from 127.0.0.1
+     Allow from 10.0.0
      Allow from ::

Restart httpd

# systemctl restart httpd 

Using your favorite browser, browse to http://10.0.0.100/phpmyadmin, assuming your server ip address is 10.0.0.100 

Login using your mysql root and password, that has been set in mysql_secure_installation step

Done