command
How to change the hostname of a Linux system
hange the hostname on a running system On any Linux system you can change its hostname with the command ‘hostname‘ (surprised?)… Here are some quick usages of the command line hostname: hostname without any parameter it will output the current hostname of the system. hostname –fqd it will output the fully qualified domain name (or [...]
How to Install Mtop (MySQL Monitoring Tool) on RHEL
Mtop is a little perl utility that shows in real time statistics of your MySQL server. It allows you to quickly identify problems related to mysql poor performance, using an interface similar to the normal ‘top’ command. If you are using Debian then the installation is trivial as mtop is in the debian packages and [...]
How to enable IP Forwarding in Linux
By default any modern Linux distributions will have IP Forwarding disabled. This is normally a good idea, as most peoples will not need IP Forwarding, but if we are setting up a Linux router/gateway or maybe a VPN server (pptp or ipsec) or just a plain dial-in server then we will need to enable forwarding. [...]
Howto change the MySQL root password
ere is a quick tip that will show several methods to change the mysql root password (that is normally empty at mysql initial install). Method 1: using the SET PASSWORD command: mysql -u root mysql> SET PASSWORD FOR ‘root’@'localhost’ = PASSWORD(‘newpass’); Method 2: using mysqladmin mysqladmin -u root password “newpass” if there was already a [...]
How to Install Memcached 1.2.2 on RHEL/Centos using DAG rpms
Add DAG/rpmforge repository to your system. In case you don’t have already the DAG repository added to your yum/up2date sources, this is the first thing you should do. You can find some useful information on how you can do this on older post of Cornelius. Once you have this working, you can proceed forward with [...]
How to Install Pear Beta Packages
Here is a quick tip that will show several methods how you can install pear beta packages. Normally if you will try to install a pear package that has not released yet a stable version, you will receive an error like: pear install Translation2 Failed to download pear/Translation2 within preferred state “stable”, latest release is [...]
How to Mount remote folders via SSH
This document describes how to install and use sshfs, a FUSE based filesystem that uses SSH to mount remote folders. Since it is based on FUSE (userspace filesystem framework for Linux) your kernel will need to have the fuse module available. FUSE is included in kernel newer than 2.6.14, so I will assume that you [...]
How to Backup your MySQL databases manually with mysqldump
MySQL provides us the tool required to do this: mysqldump. As the name implies, this can make a dump of one database or even to all the databases on the server. You can see all the options on its help manual or on the mysql site. Basically this is used like: mysqldump [OPTIONS] database [tables] [...]
How to Configure PIX−to−PIX−to−PIX IPSec (Hub and Spoke)
Introduction This configuration allows a central Cisco Secure PIX Firewall to communicate with networks behind two other PIX Firewall boxes through VPN tunnels over the Internet or any public network using IPsec. The two outlying networks have no need to communicate with each other, but there is connectivity to the central network. The two outlying [...]
PIX Terminology and Background Information
Cisco PIX Firewall BasicsThe following diagram shows a multi-port PIX connected to various networks. Cisco PIX Firewall Basics PIX terminology: we generally refer to the user segment as the Inside subnet. The interface connected to the Internet router is the outside subnet. As shown, we probably have DMZ (De-Militarized Zone) subnet, the subnet where we [...]
How to Configuring Cisco PIX to Use a Syslog Server
Most Cisco devices use the syslog protocol to manage system logs and alerts. But unlike their PC and server counterparts, Cisco devices lack large internal storage space for storing these logs. To overcome this limitation, Cisco devices offer the following two options: * Internal buffer— The device’s operating system allocates a small part of memory [...]
How to Tune Nagios For Maximum Performance
Optimization Tips: 1. Graph performance statistics with MRTG. In order to keep track of how well your Nagios installation handles load over time and how your configuration changes affect it, you should be graphing several important statistics with MRTG. This is really, really, really useful when it comes to tuning the performance of a Nagios [...]