Category: Linux Admin

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Mastering Grub – Part 1 – Introduction and Overview of Grub Boot Loader

1. Introduction to Grub Briefly, a “boot loader” is the first software program that runs when a computer starts. It is responsible for loading and transferring control to an operating system “kernel” software (such as Linux or GNU Mach). The kernel, in turn, initializes the rest...

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Linux Administration Information Center

Booting Tasks Read – Unexpected Server Reboots of RHEL servers on HP Read – Linux Admin Reference – RedHat Linux Grub Loader Storage Responsibilities Read – Understand Device Mapper and DM-Multipath Read – Identifying Disk Errors in Linux Read – Identify if linux was installed on...

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Beginners Information Center

Career Guidance Ten Technical points that every system admin should know when joining into a new team Savings Plan for System Admin – It’s about Time, not Money Quick Career Tip of this Week – have 100% complete LinkedIn Profile Careers in Computer Networking & System...

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Generating RPM and YUM Signatures for Secure Software Distribution

RPM Signautures important to ensure end-to-end security during RPM package distribution over network. RPM package files (.rpm) and yum repository metadata can be signed with GPG. Signing RPM package with a GPG key enables the recipient of the package to verify that no modifications occurred after the...

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How to Identify the Compatibility of a PCI or USB devices with RHEL Servers?

Hardware is identified during device registration and driver load by the PCI ID. This identifier can be used to search through an existing module database or in-binary module information to supply compatibility  on a given ID. Supported Module Database information To Find the Compatibility of PCI/USB device...

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RHEL 7 : How to hot plug memory on VMWARE/Virtual RHEL7 Guests

Check current memory status of all modules: [root@gurkulrhel7 ~]# more /sys/devices/system/memory/memory*/state :::::::::::::: /sys/devices/system/memory/memory0/state :::::::::::::: online :::::::::::::: /sys/devices/system/memory/memory1/state :::::::::::::: online :::::::::::::: /sys/devices/system/memory/memory2/state :::::::::::::: online :::::::::::::: /sys/devices/system/memory/memory3/state :::::::::::::: online :::::::::::::: /sys/devices/system/memory/memory4/state :::::::::::::: online :::::::::::::: /sys/devices/system/memory/memory5/state :::::::::::::: online :::::::::::::: /sys/devices/system/memory/memory6/state :::::::::::::: online :::::::::::::: /sys/devices/system/memory/memory7/state :::::::::::::: online [root@gurkulrhel7 ~]# If...

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RHEL LVM : How to recover a deleted Logical volume in RHEL 5/6

In this post, you can find the procedure to recover a deleted logical volume, from the linux server  with below configuration. Server Name :  GURKULRHEL Version          :  Redhat Enterprise Linux 6 LVM Configuraiton:                 VG NAME...

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