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8 examples to help you understand top command usage in Unix/Linux
top is one of my favorite tool for monitoring system usage and also to make any change for improving system performance.Let me show you some examples on the usage of top commandIntro:The top program...
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How to configure Private Network in VMware Workstation
Scenario:We have 3 machines each with different IP range as shown belowMachine 1 (Windows Host) - Connected to InternetIP Address - 192.168.1.xxGateway - 192.168.1.1Netmask - 255.255.255.0Machine 2...
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Iptables rules to block/allow icmp ping request in Linux
In this article I will show you different ways to block or allow incoming and outgoing icmp ping request in your Linux server.Block ICMP ping request from all the servers in my network 192.168.1.0/24...
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Iptables rules to allow/block ssh connection from specific host in Linux
Let me show you some iptable rules which can be used to allow or block ssh connection from a specific host or networkBlock 192.168.1.10 from connecting your localhost 192.168.1.6[root@test1 ~]#...
View ArticleHow to configure a caching only bind DNS server in Red Hat Linux
caching-only nameserver won't allow references to internal clients by hostname, but it does allow clients to take advantage of frequently requested domains that are cached.Pre-requisitesMake sure all...
View ArticleExisting lock /var/run/yum.pid: another copy is running
This is a very common error which you might come across in Red Hat Linux distro while trying to run yum commandError:# yum install bindLoaded plugins: fastestmirror, refresh-packagekit,...
View ArticleHow to configure BIND-9.8 DNS server in Red Hat Linux 6
In my earlier post I had shown you the step by step configuration guide for BIND DNS server but since that time I had used older version of bind rpm so most of the parameters used in that tutorial...
View ArticleWhat is GRUB boot Loader ?
On a Red Hat Linux system, the boot loader's function is to locate the Linux Kernel, and any other necessary files, and load them into memory. It then starts the kernel so that the kernel can run...
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How to generate ER diagram using Oracle SQL developer
Tool Used : SQL Developer version 3.1.07Schema Used : HRTables Used : Countries, Departments, Employees, Job_History, Jobs, Locations, RegionsNavigate the below path and step by step screen shots:File...
View ArticleHow to extend/resize Logical Volume and Volume Group in Linux
As of now you can see my root partition is on LVM with 5.8Gb size. I want to extend my root filesystem with +1GB. Now here there can be two scenarios where# df -hFilesystem Size Used Avail...
View ArticleHow to install libraries manually in Linux
Shared libraries relies heavily on concept of libraries. These are the collection of software that are re used by other programs. This avoids having to rewrite the code for functions that are used...
View ArticleHow to change default login shell permanently in linux
In Red hat Linux the default shell you login to is /bin/bash but in case you want to change the default login shell follow the below procedureTo check the currently logged in shell# echo...
View ArticleWhat is the difference between ext3 and ext4 filesystem in Linux ?
Ext3 was considered to be one of the most popular filsystems and is used in many commercial distributions but still with the increasing demands of the IT industry we started to find a lot of features...
View ArticleHow to remove logical and physical volume from Volume Group in Linux
Remove Logical Volume from Volume GroupNOTE: Make sure the logical volume to be removed is unmounted.Syntax:# lvremove /path/to/lvmOnce the logical volume is unmounted run the below command from the...
View ArticleStep by Step Linux Boot Process Explained In Detail
You can find a number of articles explaining you the Linux Boot Process. Well I am not going to tell any thing different but I would like to show my point of perspective on some extra details of the...
View ArticleHow to rename Logical Volume and Volume Group in Linux
Rename a Logical VolumeNOTE: To rename a Logical Volume you will have to unmount your partition.Syntax# lvrename Volu_Group_Name Old_log_vol_namenew_log_vol_name# lvrename VolGroup work office...
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VMware Workstation throws internal error when powering on VM
I was surprised to get this error every time I made an attempt to power on a vm in my VMware Workstation 10. Well it is not much of a big issue, so just thought to post a solution for...
View ArticlePractical examples for using find command in Linux
Here I have tried to show you a list of options or arguments which you can use with find command to narrow down your search queries.Find all the files with respect to their permissionusing octal...
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RAID levels 0, 1, 2, 3, 4, 5, 6, 0+1, 1+0 features explained in detail
What is RAID?RAID stands for Redundant Array of Inexpensive Disks which was later interpreted to Redundant Array of Independent Disks. This technology is now used in almost all the IT organizations...
View ArticleWhat are the maximum and minimum limits for RHEL 4 vs 5 vs 6 ?
Below chart shows you the comparison of various features of Red Hat Enterprise Linux between version 4, 5 and 6.Version 4Version 5Version 6Maximum Logical CPUsX86323232Itanium...
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