How to install Java 7/jdk1.7 in Centos7/RHEL7

Step 1: Download java from oracle official site:

Download “jdk-7u79-linux-x64.rpm” from here and save the package to /opt directory or change the directory where you downloaded the package:

DHCP: DORA Process

It is important to understand how DHCP uses the DORA process to operate. Dynamic Host Configuration Protocol (DHCP) is used to automatically assign IP address to client machines. Without DHCP, you would have to go to each machine and manually enter the address. DHCP is broadcast-based, using ports.

How to install Java8/jdk1.8 in Centos7/RHEL7

Step 1: Download java rpm package from oracle official site:

Download “jdk-8u60-linux-x64.rpm” from here and save the package to /opt directory or change the directory where you downloaded the package:

How to Install and Configure NTP Server on CentOS 7

Network Time Protocol – NTP- is a networking protocol for clock synchronization between computer systems over packet-switched, variable-latency data networks which runs over port 123 UDP at Transport Layer. In operation since before 1985, NTP is one of the oldest Internet protocols in current use. NTP was originally designed by David L. Mills of the University of Delaware, who still oversees its development.

How to install Apache Tomcat Natives on CENTOS7/RHEL7

Step 1: To install Tomcat Natives first need to install prerequisites compilers and development tools:

Recover corrupt rpm database on RHEL/Centos/Fedora

First thing take a backup of the existing rpm database. This is located in /var/lib/rpm. Depend on used distribution:

Name based Virtual Hosting

Step 1: Create Dir for Document root to Keep web pages for multiple domains and copy webpagescontents on it:

How to Recover MySQL database server password

Step 1: Stop Mysql Server: 

PostgreSQL server allow to connect from remote clients

Step 1: You have to make PostgreSQL listening for remote incoming TCP connections because the default settings allow listening only for connections on the loopback interface. To be able to reach the server remotely you have to add the following line into the file /etc/postgresql/9.3/main/postgresql.conf:

listen_addresses = '*'