Davoud Teimouri - Virtualization & Datacenter

A technology blog mainly focusing on virtualization and datacenter

Category: Linux

kernel: WARNING: at fs/sysfs/dir.c:536 sysfs_add_one+0xbb/0xe0 – Oracle Enterprise Linux

Most of modern servers hardware are using UEFI instead of legacy BIOS and modern OS has dedicated partition to stores boot and EFI values. Some times, the partition gets full or OS generate the below log: kernel: WARNING: at fs/sysfs/dir.c:536 sysfs_add_one+0xbb/0xe0 Kernel includes a CONFIG_EFI_VARS_PSTORE feature, and a feature that dumps kernel message log (= […]

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New Release – Kali Linux 2017.1

Kali Linux

Kali Linux is one of most popular Linux distributions and many security experts are using this distribution as penetration testing system. Kali Linux is a Debian based distribution and most Kali’s packages are imported from Debian repositories. Kali has more than 300 preinstalled tools for penetration testing such as Armitage (a graphical cyber attack management tool), nmap (a […]

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CentOS 6.9 – New Release

After announcing new Red Hat Enterprise Linux and Oracle Linux, now CentOS developer team has released new version of the distribution. Actually and as may you know, CentOS created from RHEL source codes same as Oracle Linux and usually new CentOS version will be released after RHEL version. You can read release announcement on this […]

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Oracle Linux 6.9 – New Release

Oracle Linux 6.9 After releasing RHEL 6.9 by Red Hat, Oracle has released Oracle Linux 6.9 at March 28. The new release including some fixes and also new features. The below features are notable features: Transport Layer Security (TLS) 1.2 support for all system components. Other changes include vsftpd support for TLS 1.2 and auditd support […]

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New Release – Red Hat Enterprise Linux 6.9

New release of Red Hat Enterprise Linux has been released by Red Hat at 21st March 2017. Red Hat Enterprise Linux 6.9 comes with lot of new features and updates. New Features Here is new features and major enhancements introduced in Red Hat Enterprise Linux 6.9: General Updates Authentication and Interoperability Clustering Compiler and Tools Directory Server in […]

3,230 total views, 2 views today

Monitoring Temperature And Fan Speed In Linux By LM-Sensors

What’s LM-Sensors Health monitoring is very important for critical servers because administrators can do proper actions before any impact on service. There is many third-party software for monitoring Linux and Windows servers but native agents are also useful. We are going to review one of native solutions for hardware health monitoring in Linux. Davoud Teimouri […]

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Remove Multipath Device – Map in use!


Multipath Device, Remove From Linux Based on Red Hat solution (https://access.redhat.com/solutions/47438), the below steps should be done before flush any multipath device, otherwise the command will be failed: Locate any subsystem or process holding the multipath device open. For any subsystem or process holding the multipath device open, stop the process, or issue commands to […]

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Installing Arch Linux Using Arch Anywhere – Part 1

Arch Linux is one of most popular Linux distributions and one of most updated Linux distributions. Arch Linux has no graphical or automatic installer for installation and installing Arch Linux is not simple for most new users. During installation, you have to do initialize disk, create partitions, configure boot-loader and other configurations manually. So you […]

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Oracle Software Collections 2.3

The Software Collections library allows you to install and use several different versions of the same software at the same time on a system.  Software collections are primarily intended for development environments.  These environments often require more recent versions of software components such as Perl, PHP, or Python to access to the latest features.  However, […]

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Find HBA Firmware Version in Linux – Easy Way

You need to know, what is version of your HBA firmware to upgrade it or install compatible driver version. There is many ways to find firmware version but I want to share easier way. Just logon to your Linux machine with Sudo user and run the below command:

Davoud Teimouri Davoud Teimouri is as […]

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Latest Linux Distributions Release & Update- 4th Week 2017

Linux Distribution

Latest Releases Let’s review latest Linux distributions releases and updates in this week till now. Talis 2.10 The Amnesic Incognito Live System (Tails) distribution is a Debian-based project which focuses on security and anonymity. Tails includes tools for removing meta data from files and routes Internet traffic through the Tor anonymizing network. The project’s latest release, […]

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Change Network Device Name Permanently – RedHat

Device Naming Device name management is handled by udev system. When Linux kernel discovers a new device (e.g., a network interface card) added to the system, it notifies udev daemon of the device event. The udev daemon will then match various device attributes against a set of rules to identify the device, name it, and […]

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Generate Ethernet Device UUID – RedHat

What’s UUID? A universally unique identifier (UUID) is a 128-bit number used to identify information in computer systems. Microsoft uses the term globally unique identifier (GUID), either as a synonym for UUID or to refer to a particular UUID variant. When generated according to the standard methods, UUIDs are for practical purposes unique, without requiring […]

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Centralized Logs By RSyslog

What’s Syslog? Syslog server is a server for centralizing logs that both enterprise and small businesses using native solution or third-party solution for our log centralization. When you have syslog server in your environment, there is no concern about finding root causes even when you are faced with critical hardware problem. Because you have your […]

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Red Hat Access Labs – Review

RedHat Labs Application

What’s Red Hat Access Labs? Red Hat Access Labs is a package of online application that you can use them to generate configuration files, bash script to detect vulnerabilities, analyzing issues and … .  The online applications are created by RedHat engineers to help you improve performance, troubleshoot issues, identify security problems, and optimize configuration. You can […]

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Red Hat Enterprise Linux 6.9 Beta – Now Available

RHEL 6.9 Beta RedHat announced RHEL 6.9 beta and it’s available for all customers.  While prioritizing ongoing stability and security features for critical platform deployments, Red Hat Enterprise Linux 6.9 Beta also supports the next generation of cloud-native applications through an updated Red Hat Enterprise Linux 6 base image. The Red Hat Enterprise Linux 6.9 […]

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