Display default route The following three commands display the current routing table: # route Output: Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.1.0 * 255.255.255.0 U 0 0 0 ra0 default dsl-router 0.0.0.0 UG 0 0 0 ra0 # /sbin/route Output: Kernel IP routing table Destination Gateway Genmask Flags Metric…
Iostat is a very powerful tool for monitoring the throughput of your storage subsystems. Especially to locate bottle necks and pinpoint possible upgrade scenarios. Not immediately visible here is how to install it on Centos 5.x and 6.x. We shall use the whatprovides tool in yum to locate the packages that provide iostat
To install vim [root@testarossa-00-0c-29-47-8f-35 ~]# yum whatprovides vim-enhanced Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: mirror.crazynetwork.it * epel: fr2.rpmfind.net * extras: mirror.crazynetwork.it * updates: mirror.crazynetwork.it 2:vim-enhanced-7.0.109-7.el5.i386 : A version of the VIM editor which includes : recent enhancements. Repo : base Matched from: [root@testarossa-00-0c-29-47-8f-35 ~]# yum install vim-enhanced-7.0.109-7.el5.i386 Loaded plugins: fastestmirror…
< The list of Vim commands > Working with files Vim command Action :e filename Open a new file. You can use the Tab key for automatic file name completion, just like at the shell command prompt. :w filename Save changes to a file. If you don’t specify a file name, Vim saves as the file name…
The following command gives a neat list of the Devices and their IPs / details without all the gruesome details. ifconfig | egrep "Link|inet" A sample result would be: [root@testarossa-00-0c-29-47-8f-35 vm]# ifconfig | egrep "Link|inet" eth0 Link encap:Ethernet HWaddr 00:0C:29:47:8F:2B inet addr:192.168.47.135 Bcast:192.168.47.255 Mask:255.255.255.0 eth1 Link encap:Ethernet HWaddr 00:0C:29:47:8F:35 inet addr:192.168.1.71 Bcast:192.168.1.255 Mask:255.255.255.0 lo Link…
Sometimes and with some DB platforms especially when you are testing and want to reduce the number of variables during development, testing etc.. you don not want SELinux watching your back. While it is a must to enable SELinux in hardened production systems it can be quite a pain to handle. Sometimes it needs disabling…
Total-addresses: how many unique addresses can be represented. To determine how many are available to be assigned to devices you need to subtract 2 from the provided number to allow for the ‘network’ and ‘broadcast’ address. A further one of these may need to be assigned to a router. Net bits Subnet mask Total-addresses /20 255.255.240.0 4096 /21…
Unix / Linux has a great inbuilt simplicity to it where you can create file systems on any block set . Now .. a file is a block set so technically and truly at it’s core a file system can be built on a file and mounted : I need a 100MB partition for some…
Advanced Packaging Tool Ubuntu — and all Debian-based distros — includes the Advanced Packaging Tool (APT), which can be used to easily download and install software for the operating system. This article looks at APT, and how it is used. Topics : Table of Contents Installing Software on a Computer Installing Software on Windows Installing Software on…
1. Introduction Yum is a tool for automating package maintenance for a network of workstations running any operating system that use the Red Hat Package Management (RPM) system for distributing packaged tools and applications. It is derived from yup, an automated package updater originally developed for Yellowdog Linux, hence its name: yum is “Yellowdog Updater, Modified”. Yup was originally…
