The GRUB(GNU GRand Unified Bootloader), which allows the user to select an operating system or kernel to be loaded at system boot time. GRUB also allows the user to pass arguments to the kernel. In this post, we learn how to use GRUB to limit the usable CPU and Memory size in Linux.
The tuned is a dynamic adaptive system tuning daemon running on Redhat or CentOS. It can adapt the operating system to perform better under certain workloads by setting a tuning profile.
SSH banner messages are necessary when you want to display a warning for users when they access a server over SSH.
wipefs can erase filesystem, raid or partition-table signatures (magic strings) from the specified device to make the signatures invisible for libblkid.
-a, –all
Erase all available signatures. The set of erased signatures can be restricted with the -t list option.
-f, –force
Force erasure, even if the filesystem is mounted. This is required in order to erase the partition table on a block device.
1 | $ wipefs -a /dev/nvme0n1 |
Update System Packages
1 | $ sudo apt update |
This command retrieves information about the latest available package versions from the repositories configured on the system.
Run the upgrade
Run the following command to upgrade the installed packages, including the kernel, to the latest versions available in the repositories:
1 | $ sudo apt upgrade |
A context in kubernetes is used to group access parameters under a convenient name. Each context has three parameters: cluster, namespace, and user. By default, the kubectl command-line tool uses parameters from the current context to communicate with the cluster.
iostat is a Linux I/O performance monitoring utility. It’s very commonly used to analyze device utilization.