Logical Volume Management (LVM) in Linux is a method to easily manage disk space. Suppose as an admin you have three disks: 60Gb, 50Gb and 40Gb and you want to allocate 80Gb and 70Gb of space to two users U1 and U2 respectively. Now, there is no single unit of either size available. This is …
When you want to learn about disk partitioning or swap space or Logical Volume management or Stratis or VDO you need to have a free disk in your system. But by default when you install Linux in either VMware or Virtual-box there is no extra disk or free disk available. In this post, we will …
How to add virtual disk in Linux using VMware/Virtual-Box Read More »
Swap space is an area in the secondary storage device which is used to supplement system RAM by holding the inactive pages of memory. The combination of system RAM and swap space is referred to as Virtual memory. When the available RAM usage exceeds a specified limit then the kernel will write idle pages belonging …
Partitioning a disk allows you to create separate sections within the disk inorder to manage your data more efficiently. For example, in Windows you have C, D or E drives. There are various uses of partitioning a disk like:a) Allows to boot different OS from same diskb) Allocate separate partition to different usersc) Creating separate …
Program for IPC using Message queues are almost similar to named pipes with the exception that they do not require the opening and closing of pipes. But, they face one similar problem like named pipes; blocking on full pipes. Message queues send blocks of data from one process to another. Each block of data is …
In this post we are going to understand the C program implementing the solution to the Dining Philosopher Problem. The Dining Philosopher Problem states that there are five philosophers which do two thinks: think and eat. They share a table having a chair for each one of them. In the center of the table there …
Real time scheduling is of two types: Soft Real-Time scheduling which does not guarantee when when a critical real-time process will be scheduled; Hard Real-Time scheduling in which the process must be scheduled before the deadline. In this post we will cover two real time scheduling algorithms: rate monotonic scheduling and earliest deadline first. Points …
The standard Linux permissions are suitable for most situations but they have their own limitations. The standard permissions limit access to file owner, group owner and others. But, what-if we want to grant specific permission to another named user, other than the user-owner or another named group other than the group-owner. Access Control List (ACL) …
As a user if you want to schedule certain activities which should repeat themselves on their own at some time in the future i.e., you want to schedule recurring tasks then use the crontab command. In this post we will learn scheduling recurring tasks using crontab command There are different ways to use the crontab …
Scheduling recurring tasks using crontab command Read More »
At times we forget the root user password that we have set on our Linux machine. In this post, we will learn how to recover a lost root password in Linux. The procedure is most suitable of RedHat, Fedora and CentOS operating systems. Follow the below mentioned procedure: Step 1: Reboot the machine and stop …