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 reasons 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 in Simple Steps
Usually, we enter a username and password combination to connect to an SSH console. But, there is something more secure than Password logon, we have passwordless SSH login using the encrypted keys. The chances to crack a key are effectively [...]
How to Create a New Disk Partition in Linux
Storage devices such as a hard disk or USB drives need to structured before start using it. Partitioning is the process of slicing the disk into one more separate region called a partition. Most importantly a partition is required to [...]
5 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 won't 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 us to bond multiple network interfaces using a [...]
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”
In some situations when you try to unmount a filesystem especially NFS, it displays 'device is busy' message. This happens often when the NFS server has some issues (mainly unreachable) and you have a soft NFS mount. There are different [...]
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. [...]
Tr Command in Linux with Examples
The tr (translate) command is used in Linux mainly for translating and deleting characters. It can be used to convert uppercase to lowercase, squeeze repeating characters and deleting characters. Tr command requires two sets of characters for transformations and also [...]