Best of Tech Support
Question: after a power blackout I am having trouble with my drive. I am using the ext2 filesystem. With the help of the tomsrtbt floppy distribution and a couple of documents from the LDP, I have been able to boot in single-user mode. But when I try to execute the network script, the system sticks after echoing the following:
Disabling IPv$ packet forwarding sysctl: ip forwarding off
What can I try next?
—Roberto Kruse, email@example.com
I would advise you to boot from a rescue disk and run an e2fsck on the partitions of your damaged hard disk for an automatic check:
e2fsck -p -v /dev/<partition_to_fix>
Keep in mind that messing around with your disk, even with fsck and e2fsck, may result in loss of data, so be careful that you understand what you are about to do.
—Felipe E. Barousse Boué, firstname.lastname@example.org
You can try booting Linux with linux single or linux init=/bin/bash if all else fails. Type this at the LILO prompt. After that, you can look at the output of rpm -Va, which should tell you which packages have modified or missing files, and you can then re-install the said packages (with rpm -U --force /location/of/package.rpm) All that said, it's probably as good a time as any to upgrade your system to the latest Red Hat version, which should also fix your problem in the process.
—Marc Merlin, email@example.com
I would like to access a Disgo 16MB USB Flash RAM device from Mandrake Linux. Will Linux automatically mount this device? If so, how can I find it?
I believe that Mandrake uses the usbdevfs pseudo-filesystem, though I don't know where it mounts. Type mount to see. My Red Hat machine mounts it on /proc/bus/usb.
—Ben Ford, firstname.lastname@example.org
Linux supports USB storage devices if you have a recent kernel version. According to Mandrake's web site, they shipped 8.1 with kernel version 2.4.8. However, because the device drivers have evolved quite a bit in the last few months, it may be helpful to update to the latest 2.4.x version, which at the time of this writing is 2.4.18. You will need both the USB device filesystem and SCSI generic support. Then, check out the Linux USB Guide (linux-usb.sourceforge.net/USB-guide/book1.html). The “mass storage” section should be helpful.
—Chad Robinson, email@example.com
Practical Task Scheduling Deployment
July 20, 2016 12:00 pm CDT
One of the best things about the UNIX environment (aside from being stable and efficient) is the vast array of software tools available to help you do your job. Traditionally, a UNIX tool does only one thing, but does that one thing very well. For example, grep is very easy to use and can search vast amounts of data quickly. The find tool can find a particular file or files based on all kinds of criteria. It's pretty easy to string these tools together to build even more powerful tools, such as a tool that finds all of the .log files in the /home directory and searches each one for a particular entry. This erector-set mentality allows UNIX system administrators to seem to always have the right tool for the job.
Cron traditionally has been considered another such a tool for job scheduling, but is it enough? This webinar considers that very question. The first part builds on a previous Geek Guide, Beyond Cron, and briefly describes how to know when it might be time to consider upgrading your job scheduling infrastructure. The second part presents an actual planning and implementation framework.
Join Linux Journal's Mike Diehl and Pat Cameron of Help Systems.
Free to Linux Journal readers.Register Now!
- Google's SwiftShader Released
- SUSE LLC's SUSE Manager
- My +1 Sword of Productivity
- Murat Yener and Onur Dundar's Expert Android Studio (Wrox)
- Managing Linux Using Puppet
- Non-Linux FOSS: Caffeine!
- Interview with Patrick Volkerding
- SuperTuxKart 0.9.2 Released
- Parsing an RSS News Feed with a Bash Script
- Doing for User Space What We Did for Kernel Space
With all the industry talk about the benefits of Linux on Power and all the performance advantages offered by its open architecture, you may be considering a move in that direction. If you are thinking about analytics, big data and cloud computing, you would be right to evaluate Power. The idea of using commodity x86 hardware and replacing it every three years is an outdated cost model. It doesn’t consider the total cost of ownership, and it doesn’t consider the advantage of real processing power, high-availability and multithreading like a demon.
This ebook takes a look at some of the practical applications of the Linux on Power platform and ways you might bring all the performance power of this open architecture to bear for your organization. There are no smoke and mirrors here—just hard, cold, empirical evidence provided by independent sources. I also consider some innovative ways Linux on Power will be used in the future.Get the Guide