Static routes are much important if you have more than one interface connecting to different subnet. Enabling static routes gains much performance for your network. Either of the two below commands can be used to set/delete static routes. 1) ip [...]
How To Create, Extend, Remove Swap Partition in Redhat/Centos LVM
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 [...]
Show Storage Luns Allocated 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 [...]
Linux XDMCP Service - How to access remote Linux GUI
Most linux admins work from shell and there is not much requirement to connect to the X window. But, in some cases, we need to access graphic console (X window Manager). For example, if a user needs to install oracle [...]
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 [...]
4 Steps Passwordless SSH Login and Updating Keys
Hi all, today we'll gonna learn how we can setup Passwordless SSH Logon 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 paring, [...]
How to Create Partition in Linux using fdisk Tool
Fdisk is command-line utility that provides disk partitioning functions for various operating systems. It was originally developed by IBM in 1983 and since then it was used on most operating systems from DOS to Windows and to Unix-based systems. Using fdisk [...]
Linux Encrypted Filesystem Using Loopback Filesystem
If you have a computer that is really important, you don’t want to blow away your OS on a regular basis after an experiment goes awry – This is perhaps the reason the loopback file system was born. With this [...]
5 Tips to Fix Linux Booting Issues
As for many systems, you can use it every day but it can happen that for some reason, your system doesn't boot and you need to know how you can do in these situations. Some Linux distributions don't offer a [...]
How To Enable, Create, Activate Ethernet Bonding in Linux
During your projects or during your experiences(experiments) regarding administration systems and network, you doubtless go one day to be confronted with the problems of load balancing and high availability of links ethernet. Ethernet bonding is a method of combining (joining) two [...]
How Scan LUN In Redhat Linux Vmware Guest OS
In this blog, I am trying to give some examples that 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 [...]
3 Commands To Unmount when NFS Mounted Directory is Busy
When you do an NFS mount, it can happen that, for some reasons, we are not able to unmount the disk/partition. When it happens, if we care to lost data, we need to use a safety method to resolve the [...]
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 used [...]