Welcome!

Linux Containers Authors: Liz McMillan, Elizabeth White, Yeshim Deniz, Zakia Bouachraoui, Pat Romanski

Related Topics: Linux Containers

Linux Containers: Article

Bad File Descriptor Error in Linux

Stellar Phoenix Linux Data Recovery is a comprehensive data recovery tool

In a Linux system, files, blocks, directories, sockets and other items are referred by corresponding file descriptors. If your system is reporting errors that the file descriptor is bad, one of possible causes is that file system is corrupt and thus, you require restoring from backup. But if backup is not valid enough to restore complete information, you need to use advanced Linux Data Recovery applications.

As an instance, you might encounter the below error message with your Linux based system:

Bad file descriptor”

You might receive this error while trying to access a file or while trying to boot the system.

Cause

Possible reasons for the ‘Bad file descriptor’ error to occur are:

  • Linux systems use a special file, called /dev/null (also called the null device). This file removes all the data that is written to it after reporting that the write process has successfully succeeded. You might receive the above error message if /dev/null has been deleted or overwritten. You can infer this cause when file system is reported as read-only at the time of booting through error messages, such as“/dev/null: Read-only filesystem” and “dup2: bad file descriptor”

  • If you get this error message while trying to access a file, the most prominent causes are file system corruption or damaged disk block(s). In such situations, you also get write errors.

Solution

You need to use these methods to troubleshoot the above behavior:

  • For solving deleted or overwritten /dev/null file issues, you need to replace it with the suitable inode. To do so, follow these steps:

    • Boot the system in single-user mode

    • Mount the /proc file system as:

mount -o ro /proc

/proc is the dynamically generated file system while boot process

  • Mount the file system in read-write mode as:

mount -o remount,rw /

  • Delete the /dev/null file:

m -f /dev/null

  • Use correct inode to replace it as:

mknod -m 666 /dev/null c 1 3

  • Remount the file system in read-only mode and restart the system

  • To correct file system and disk block issues, execute fsck command. You should run the command when the file system is not mounted. If problem persists, reformat the volume and restore from backup. In case of backup problems, you will need to use Linux Recovery tools. Such utilities perform Data Recovery Linux using powerful scanning algorthms and provide graphically rich user interface.

Stellar Phoenix Linux Data Recovery is a comprehensive data recovery tool for Linux-based system. It supports safe Data Recovery  Linux for Ext2, Ext3, and ReiserFS file systems. The application provides you advanced features such as, RAW File Recovery, File Filter, Append File Header etc. It is compatible with almost all Linux distributions including Gentoo, SlackWare, Mandrake, Red Hat, Ubuntu, SUSE etc.

More Stories By Allen Sood

Allen Sood is a student of Mass Communication doing research on Linux Data Recovery software.

IoT & Smart Cities Stories
Early Bird Registration Discount Expires on August 31, 2018 Conference Registration Link ▸ HERE. Pick from all 200 sessions in all 10 tracks, plus 22 Keynotes & General Sessions! Lunch is served two days. EXPIRES AUGUST 31, 2018. Ticket prices: ($1,295-Aug 31) ($1,495-Oct 31) ($1,995-Nov 12) ($2,500-Walk-in)
Andrew Keys is Co-Founder of ConsenSys Enterprise. He comes to ConsenSys Enterprise with capital markets, technology and entrepreneurial experience. Previously, he worked for UBS investment bank in equities analysis. Later, he was responsible for the creation and distribution of life settlement products to hedge funds and investment banks. After, he co-founded a revenue cycle management company where he learned about Bitcoin and eventually Ethereal. Andrew's role at ConsenSys Enterprise is a mul...
Nicolas Fierro is CEO of MIMIR Blockchain Solutions. He is a programmer, technologist, and operations dev who has worked with Ethereum and blockchain since 2014. His knowledge in blockchain dates to when he performed dev ops services to the Ethereum Foundation as one the privileged few developers to work with the original core team in Switzerland.
René Bostic is the Technical VP of the IBM Cloud Unit in North America. Enjoying her career with IBM during the modern millennial technological era, she is an expert in cloud computing, DevOps and emerging cloud technologies such as Blockchain. Her strengths and core competencies include a proven record of accomplishments in consensus building at all levels to assess, plan, and implement enterprise and cloud computing solutions. René is a member of the Society of Women Engineers (SWE) and a m...
Digital Transformation and Disruption, Amazon Style - What You Can Learn. Chris Kocher is a co-founder of Grey Heron, a management and strategic marketing consulting firm. He has 25+ years in both strategic and hands-on operating experience helping executives and investors build revenues and shareholder value. He has consulted with over 130 companies on innovating with new business models, product strategies and monetization. Chris has held management positions at HP and Symantec in addition to ...
The challenges of aggregating data from consumer-oriented devices, such as wearable technologies and smart thermostats, are fairly well-understood. However, there are a new set of challenges for IoT devices that generate megabytes or gigabytes of data per second. Certainly, the infrastructure will have to change, as those volumes of data will likely overwhelm the available bandwidth for aggregating the data into a central repository. Ochandarena discusses a whole new way to think about your next...
CloudEXPO | DevOpsSUMMIT | DXWorldEXPO are the world's most influential, independent events where Cloud Computing was coined and where technology buyers and vendors meet to experience and discuss the big picture of Digital Transformation and all of the strategies, tactics, and tools they need to realize their goals. Sponsors of DXWorldEXPO | CloudEXPO benefit from unmatched branding, profile building and lead generation opportunities.
Dynatrace is an application performance management software company with products for the information technology departments and digital business owners of medium and large businesses. Building the Future of Monitoring with Artificial Intelligence. Today we can collect lots and lots of performance data. We build beautiful dashboards and even have fancy query languages to access and transform the data. Still performance data is a secret language only a couple of people understand. The more busine...
All in Mobile is a place where we continually maximize their impact by fostering understanding, empathy, insights, creativity and joy. They believe that a truly useful and desirable mobile app doesn't need the brightest idea or the most advanced technology. A great product begins with understanding people. It's easy to think that customers will love your app, but can you justify it? They make sure your final app is something that users truly want and need. The only way to do this is by ...
DXWorldEXPO LLC announced today that Big Data Federation to Exhibit at the 22nd International CloudEXPO, colocated with DevOpsSUMMIT and DXWorldEXPO, November 12-13, 2018 in New York City. Big Data Federation, Inc. develops and applies artificial intelligence to predict financial and economic events that matter. The company uncovers patterns and precise drivers of performance and outcomes with the aid of machine-learning algorithms, big data, and fundamental analysis. Their products are deployed...