What is LUKS disk encryption In environments such as government companies, users may want to secure their data which can include private customer details. To do so, Linux provides a good number of cryptographic techniques, which can be used to protect data on physical devices such as hard disks or a removable media. One such cryptographic technique uses the Linux Unified Key Setup-on-disk-format (LUKS). This technique allows for the encryption of Linux partitions. LUKS has the following … [Read more...] about How to configure encrypted swap using LUKS in CentOS/RHEL
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ABRT (Automatic Bug Reporting Tool), is a set of tools that help users detect and analyze application crashes. ABRT features additional type of lightweight bug report that can be used to report software crashes to Red Hat. These reports, called uReports, are designed to contain no potentially sensitive information and do not require you to download a potentially large amount of debugging information. They will allow Red Hat to keep track of bug occurrences while not necessarily providing enough … [Read more...] about How to install and configure ABRT (Automatic Bug Reporting Tool) in CentOS/RHEL
What Is a Shell? A shell is a program that provides an interface between a user and an operating system (OS) kernel. An OS starts a shell for each user when the user logs in or opens a terminal or console window. What Is a Shell Script? A shell script is a file that contains shell and UNIX commands. Similar to compiled executable programs, the shell script has a specific purpose and is reusable. When the commands in the shell script are ordered and error-free, you can execute the shell … [Read more...] about What are Shell Scripts? How to Create Shell Scripts?
What is NUMA? NUMA is a technology that allows the system memory to be divided into zones, also named nodes. The NUMA nodes are then allocated to particular CPUs or sockets. In contrast to the traditional monolithic memory approach, where each CPU/core can access all the memory regardless of its locality, usually resulting in larger latencies, NUMA bound processes can access memory that is local to the CPU they are being executed on. In most cases, this is much faster than the memory connected … [Read more...] about Understanding Automatic NUMA balancing
What is NUMA Non-Uniform Memory Access or Non-Uniform Memory Architecture (NUMA) is a physical memory design used in SMP (multiprocessors) architecture, where the memory access time depends on the memory location relative to a processor. Under NUMA, a processor can access its own local memory faster than non-local memory, that is, memory local to another processor or memory shared between processors. In a NUMA system, processors, memory, and I/O are grouped together into cells. The latency … [Read more...] about What is NUMA and How does it work in Linux
What is xhosts The xhost command is the Linux X-Windows server access control program. Depending on the arguments used, xhost grants or denies user/host access (connections) to the local X-server, thereby allowing or denying users/hosts the ability to display X-Windows-based applications e.g. xclock, graphical installers etc. The purpose of this post is to describe how to configure xhost to be persistent across Linux server reboot, thereby ensuring that users/hosts may continue to display … [Read more...] about What is xhosts? Using xhost to manage access control to X server