Using Linux to Teach Unix System Administration
When you are done entering the linux command-line options, press enter. After all the messages detailing unsuccessful checks for various hardware devices, the system gives you a login prompt. The following four options are displayed on the screen:
demo--gives an X-windows demo program that runs very slowly from the CD-ROM on the first use, but runs much more quickly once it is in memory.
guest--sets up a guest login with normal user rights. This is useful for teaching labs in which students need to determine access rights for certain files and directories by accessing them as guest.
install--allows you to install Linux and gives several menus on the screen.
root--gives you permissions to all files and commands.
For the purposes of this discussion, a root login is assumed. When you type the mount command without arguments, the screen output will look similar to the following:
/dev/hdd on / type iso9660
/dev/ramdisk on /ramdisk type ext2 (rw) /proc on on type /proc (type)
/dev/hdd refers to the CD-ROM mounted as root. /dev/ramdisk refers to the file system named /ramdisk, which is using internal RAM and can to be altered. /proc is the standard Unix pointer location for devices.
I have my students enter the following command:
mkdir /ramdisk/mnt /ramdisk/dos
This command creates two directories on /ramdisk to be used as follows:
/ramdisk/mnt is used to mount a Unix-formatted diskette.
/ramdisk/dos is used to mount a DOS-formatted diskette.
You format a 1.44MB diskette by typing the command:
The following output will appear on the screen:
Double sided, 80 tracks, 19s sec/track. Total capacity is 1440KB formatting...done verifying... done
Note that formatting will destroy any files already on the diskette you insert.
Now, to create a Unix file system on the diskette, type the following command:
You can then mount the diskette by typing:
mount /dev/fd0H1440 /ramdisk/mntNow, when you type mount alone, the following output appears on the screen:
/dev/hdd on / type iso9660 (ro)/dev/ramdisk on /ramdisk type ext2 (rw) /proc on on type /proc (type) /dev/fd0u1440 on /ramdisk/mnt type ext2 (rw)
Linux files can now be saved to /ramdisk/mnt. To unmount the diskette use the command:
It is sometimes necessary to transfer student assignments from the Linux box to the AIX box. Because networking is not done under Linux, it is necessary to use the diskette as the transfer media. The transfer is done using FTP from a DOS/Windows PC to the AIX box.
You will need to format the diskette under DOS. (Be sure you unmount any diskettes from the above exercise.) DOS formatting is done in Linux with the command:
Mount the DOS diskette with the command:
mount -t msdos /dev/fd0H1440 /ramdisk/dosTyping mount alone produces the following output:
/dev/hdd on / type iso9660 (ro)/dev/ramdisk on /ramdisk type ext2 (rw) /proc on on type /proc (type) /dev/fd0u1440 on /ramdisk/dos type msdos (rw)
You can now save files in DOS format to /ramdisk/dos. Note that you must use the standard DOS file naming convention of up to 8 characters for the prefix, then a period, then up to 3 characters for the extension. You can unmount the diskette with the command:
|Dynamic DNS—an Object Lesson in Problem Solving||May 21, 2013|
|Using Salt Stack and Vagrant for Drupal Development||May 20, 2013|
|Making Linux and Android Get Along (It's Not as Hard as It Sounds)||May 16, 2013|
|Drupal Is a Framework: Why Everyone Needs to Understand This||May 15, 2013|
|Home, My Backup Data Center||May 13, 2013|
|Non-Linux FOSS: Seashore||May 10, 2013|
- RSS Feeds
- Making Linux and Android Get Along (It's Not as Hard as It Sounds)
- Using Salt Stack and Vagrant for Drupal Development
- Dynamic DNS—an Object Lesson in Problem Solving
- New Products
- Validate an E-Mail Address with PHP, the Right Way
- Drupal Is a Framework: Why Everyone Needs to Understand This
- A Topic for Discussion - Open Source Feature-Richness?
- Download the Free Red Hat White Paper "Using an Open Source Framework to Catch the Bad Guy"
- Tech Tip: Really Simple HTTP Server with Python
- Roll your own dynamic dns
4 hours 26 min ago
- Please correct the URL for Salt Stack's web site
7 hours 37 min ago
- Android is Linux -- why no better inter-operation
9 hours 52 min ago
- Connecting Android device to desktop Linux via USB
10 hours 21 min ago
- Find new cell phone and tablet pc
11 hours 19 min ago
12 hours 48 min ago
- Automatically updating Guest Additions
13 hours 56 min ago
- I like your topic on android
14 hours 43 min ago
- This is the easiest tutorial
21 hours 19 min ago
- Ahh, the Koolaid.
1 day 2 hours ago
Enter to Win an Adafruit Pi Cobbler Breakout Kit for Raspberry Pi
It's Raspberry Pi month at Linux Journal. Each week in May, Adafruit will be giving away a Pi-related prize to a lucky, randomly drawn LJ reader. Winners will be announced weekly.
Fill out the fields below to enter to win this week's prize-- a Pi Cobbler Breakout Kit for Raspberry Pi.
Congratulations to our winners so far:
- 5-8-13, Pi Starter Pack: Jack Davis
- 5-15-13, Pi Model B 512MB RAM: Patrick Dunn
- 5-21-13, Prototyping Pi Plate Kit: Philip Kirby
- Next winner announced on 5-27-13!
Free Webinar: Hadoop
How to Build an Optimal Hadoop Cluster to Store and Maintain Unlimited Amounts of Data Using Microservers
Realizing the promise of Apache® Hadoop® requires the effective deployment of compute, memory, storage and networking to achieve optimal results. With its flexibility and multitude of options, it is easy to over or under provision the server infrastructure, resulting in poor performance and high TCO. Join us for an in depth, technical discussion with industry experts from leading Hadoop and server companies who will provide insights into the key considerations for designing and deploying an optimal Hadoop cluster.
Some of key questions to be discussed are:
- What is the “typical” Hadoop cluster and what should be installed on the different machine types?
- Why should you consider the typical workload patterns when making your hardware decisions?
- Are all microservers created equal for Hadoop deployments?
- How do I plan for expansion if I require more compute, memory, storage or networking?