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Linux | Tutarticle

Checking System Resources with sar

rhel-7

The System Activity Reporter (sar) is one of the oldest system monitoring facilities created for early UNIX systems—predating Linux by a few decades. The sar command itself can display system activity continuously, at set intervals (every second or two), and display it on the screen. It can also display system activity data that was gathered earlier.The sar command is part of the sysstat package. By installing sysstat and enabling the sysstat service, your system immediately begins gathering system activity data

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Managing RPM Packages with YUM in Linux

rhel-7

The Yellowdog Updater Modified (YUM) project set out to solve the headache of managing dependencies with RPM packages. Its major contribution was to stop thinking about RPM packages as individual components and think of them as parts of larger software repositories. With repositories, the problem of dealing with dependencies fell not to the person who installed the software, but to the Linux distribution or third-party software distributor that makes the software available. So, for example, it would be up to

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Creating LVM logical volumes

lvm-logical-volume-manager-in-linux

LVM logical volumes are used from the top down, but they are created from the bottom up. First you create one or more physical volumes (pv), use the physical volumes to create volume groups (vg), and then create logical volumes from thevolume groups (lv). Commands for working with each LVM component begin with the letters pv, vg, and lv. For example, pvdisplay shows physical volumes, vgdisplay shows volume groups, and lvdisplay shows logical volumes. The following procedure takes you through

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Linux Directory Structure

rhel-7

The Linux fi lesystem is organized as a hierarchy of directories. Some of the important Linux directories are: ■ /bin—Contains common Linux user commands, such as ls, sort, date, and chmod. ■ /boot—Has the bootable Linux kernel and boot loader configuration files (GRUB). ■ /dev—Contains files representing access points to devices on your systems. These include terminal devices (tty*), floppy disks (fd*), hard disks (hd* or sd*), RAM (ram*), and CD-ROM (cd*). Users can access these devices directly through these device files;

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