Shared memory is the memory that may be accessed by multiple processes; i.e. a memory region that can be shared between different processes and a better way of passing data between two processes. Shared memory is the fastest form of [...]
How to Flush Routing Table from Cache in Linux
In this article, I will describe how to flush routing table in Linux using terminal commands. A routing table in computer networking is a data table that's stored on a router or network server which lists the routes to particular network destinations. Usually, each [...]
How to Create Swap File/Partition on Linux
Swap memory is required when the system requires more memory than it is physically available. The kernel swaps out less used pages and gives memory to the current process that needs the memory immediately. So a page of memory is [...]
How to View Attached/Allocated Luns on Linux
When you are working in a storage environment, it is often desirable to add, remove or re-size storage devices while the operating system is running and without rebooting. But instead of doing theses operations, you can most need to identify/show [...]
How to use XDMCP for Remote Desktop Access on Linux
In this tutorial, I will show you how to configure your Linux system to use graphical (GUI) login with XDMCP service to access remote GUI. Most Linux admins work from shell and there is not much requirement to connect to [...]
How to Backup LVM Configuration on Linux (vgcfgbackup & vgcfgrestore)
Due to several reason a volume group may become corrupted after unintended user intervention. LVM will not be aware of this situation unless the alternate is already on the volume group, and may allow to add the alternate path to [...]
Setup Passwordless Ssh Login Between Linux Systems
Hi all, today we'll gonna learn how we can setup Passwordless SSH login to Linux systems. Only the workstations having the correct matching key pair (private and public) will be allowed to logon to the SSH server, without the key [...]
How to Create Partition in Linux
In this tutorial, let's learn how to create a partition on Linux using fdisk commands. Fdisk is a command line utility that provides disk partitioning functions for various operating systems. It was originally developed by IBM in 1983 and since then [...]
Learn 5 Simple Tips to Fix Booting Issues in Linux
As for many systems, you can use it every day but it can happen that for some reason, your Linux wont boot and you need to know how you can do in these situations. Some Linux distributions don't offer a [...]
How to Setup Ethernet Bonding in Linux
Ethernet bonding is a method of combining (joining) two or more network interfaces together into a single virtual NIC card which may increase the bandwidth and provides redundancy of NIC Cards. Linux allows to bond multiple network interfaces using a special [...]
How to Scan Lun on Vmware Running Redhat Linux Guest OS
In this tutorial, I will show how to scan LUN from a Redhat Linux Vmware Guest OS (This example is from RHEL3). Once LUNs are mapped for VM's, it should be made visible to the OS. Below commands helps to [...]
3 Ways to Force Unmount in Linux Showing “device is busy”
When you do an NFS mount, it sometimes shows "device is busy” status, in such case we need to perform force unmount in a graceful way. There are different ways and options we can try out if normal nfs unmount fails. [...]
Easy Steps Enabling SNMP and Configuration In Linux
Before I explain about Linux SNMP configuration, I'll let you know what is SNMP. Simple Network Management Protocol (SNMP) is a well known protocol for network management. It is really hard to manage large networks that have thousands of network device. [...]
How to use Linux tr Command with Examples
The tr command is used in Linux for translating characters, it needs two sets of characters. It replaces occurrences of the characters in the first set with the corresponding character from the second set. For example, tr command can be [...]