Best of Technical Support
I live a few miles off the electric and phone lines with no line of sight to a repeater dish in one of the largest and poorest counties in the US.
For those of us with remote homes in the mountains near the Canadian border who have gotten computers during the last few years, internet access is many miles away.
While DirecPC works with a satellite connect down, one needs a telephone line out to the Net. Many of us do not have phone access, yet a radio system less expensive than the Ham radio would make a great change in our lives. Our download needs are greater than our upload needs. How do we make this work?
—Robert Thomas, email@example.com
You can run DirecPC from Linux with a router from www.helius.com. They are scheduled to come out with a two-way router for bidirectional DirecPC in the third quarter of 2001. My suggestion to you would to be set up a network with your neighbors with a caching server to speed access.
—Ben Ford, firstname.lastname@example.org
Community net groups are using standard WiFi cards and modified satellite dishes to make high-speed connections that span miles. You might be interested in using this technology to share your satellite access with neighbors. See www.toaster.net/wireless/community.html.
—Don Marti, email@example.com
I installed and partitioned a second hard drive, but I can't make a filesystem on it.
—Kevin Williams, firstname.lastname@example.org
First, figure out what device you are talking about. Here is a simple chart to determine device names: /dev/hda1 master drive on primary channel, 1st partition /dev/hda2 master drive on primary channel, 2nd partition /dev/hdb1 slave drive on primary channel, 1st partition /dev/hdb2 slave drive on primary channel, 2nd partition /dev/hdc1 master drive on secondary channel, 1st partition /dev/hdc2 master drive on secondary channel, 2nd partition /dev/hdd1 slave drive on secondary channel, 1st partition /dev/hdd2 slave drive on secondary channel, 2nd partition Next, choose the filesystem you would like on it. SuSE includes reiserfs with their distro; I recommend that as it doesn't require tedious filesystem checks on a bad reboot. Then format the drive. The command used to make reiserfs partition is mkreiserfs <devicename>, where <devicename> is the device name of your partition. If you want to stick with ext2, use the same command but replace mkreiserfs with mke2fs. Now you have a useable drive partition; all that is left is to mount it. Choose or create a mountpoint in your filesystem. I will use /mnt/storage for this example. Create the mountpoint with mkdir /mnt/storage. As you see, the mountpoint is nothing more than a directory. Now mount the drive like this:
mount <devicename> /mnt/storage -t <filesystem type>
where <devicename> is the device name of the partition and <filesystem type> is the type of filesystem. You now have another useable hard drive. One step remains. I assume you want this accessible next time you boot the system, so we need to add the partition to /etc/fstab. Add a line like this to that file:
<devicename> <mountpoint> <filesystem type> defaults 0 0where <devicename> is the device name of your partition, <mountpoint> is the mountpoint you are using and <filesystem type> is the type of filesystem on that partition. If you choose to use reiserfs, leave the last two numbers as 0 0. If you use ext2, make those numbers 1 2.
—Ben Ford, email@example.com
The installation of Red Hat 6.2 on my Dell OptiPlex GX150 went well. However, after the system came up, I couldn't ping any host, even on the same subnet. I typed arp -a and the system hung. The system has an integrated 3Com 920 10/100 BT card.
—Khoa Nguyen, firstname.lastname@example.org
Use netconfig to set up your networking. You can also use lsmod to see if the module for that card is loaded. I would guess that the module for that card would be the 3c90x. You may have to load this module by hand if the card isn't automatically detected by using the command modprobe 3c90x. If this works, edit the file /etc/modules.conf and add the line alias eth0 3c90x.
—Ben Ford, 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!
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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