Linux « Khanun Fodder

yum (or any other web dependent console app)

posted by Knut Torgersen

Mar 23

If you have to update your Linux and you are behind a proxy, you can do the following:

export yourproxyserver:port

from your command line. After you have issued that command, you are free to use yum (or whatever web command you need) as usual.

For a more permanent solution, put this in /etc/profile.d and every user on your system can benefit from it.

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Eeebuntu/Ubuntu and others that use sudo

posted by Knut Torgersen

Nov 1

In an earlier post I wrote how to get around the locked-out root user on Linux flavors that feel root should never be used. Well, there is an even easier way:

sudo passwd <enter your password> <invent a secure password for root>

and that’s all.

…One more thing: Linux’es using this mechanism will prompt for your password, not the newly generated root password when you as yourself do things requiring root access.

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Getting contact with the Neo Freerunner from Windows

posted by Knut Torgersen

Jan 12

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sudo

posted by Knut Torgersen

Jul 28

I hate sudo. a) it is to me weird b) if you have many commands you get tired of typing sudo in front of all of them c) it looks stupid. Yes, two out of three are highly subjective. But – it is really easy to fix! At least, on Ubuntu it is.

On the command line, type:

sudo bash
<password>
passwd
<invent a SECURE password for root>

Easy, eh?

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X forwarding – or using X applications on your Windows PC

posted by Knut Torgersen

May 12

This is untested as of FreeBSD, so if anyone can confirm, it would be nice.

You have: 1 PC running Linux and one PC running Windows. You want: To run the X applications on your Windows computer, since you are already able to run console applications via SSH and PuTTY. You need: X enabled Linux (that is, Linux with X installed and running), Windows, PuTTY and Xming.

Alter /etc/ssh/sshd_config so that the following are enabled:
X11Forwarding yes X11DisplayOffset 10 X11UseLocalhost yes
Restart ssh or restart Linux if you cannot find out how to do it on your distribution
Install Xming (an X Window server)
If you do not already have PuTTY, install it
Open PuTTY and goto Connection – SSH – X11 and enable X11 forwarding. Set X display location to localhost:0
Save the settings in PuTTY if you want and then open a session to your Linux PC

Test your settings by typing

xclock &

and hitting Enter. xclock should now appear on your screen in Windows. Note: You run everything on your Linux server, so every CPU hogging application will hog the Linux server! Neat. I tested scanning in a picture with the scanner attached to the Linux PC. Works like a charm!

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last

posted by Knut Torgersen

Feb 6

One interesting command is called last – to see who logged in last.

[root@centos ~]# last root pts/3 peregrin.lan Wed Feb 6 19:21 still logged in knutt pts/1 :0.0 Wed Feb 6 19:12 still logged in knutt pts/2 :0.0 Wed Feb 6 16:29 still logged in knutt pts/1 :0.0 Wed Feb 6 16:28 - 19:12 (02:43) knutt :0 Wed Feb 6 16:27 still logged in root tty2 Wed Feb 6 16:14 still logged in root tty1 Wed Feb 6 15:54 still logged in reboot system boot 2.6.18-53.1.6.el Wed Feb 6 15:51 (03:29) root tty1 Wed Feb 6 06:44 - crash (09:07)
last with no arguments gives you a log list of the last entries. last username tells you when that particular user logged in the last time – and a side effect here is the fact that since there is a pseudo user called reboot that logs in just before your system goes down, you can also write last reboot and get a comprehensive listing of when you rebooted. FreeBSD use a similar command with a slightly different output.

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Ctrl+Alt+Del

posted by Knut Torgersen

Feb 2

How nice when you are in a TTY and you by old Windows habit press Ctrl+Alt+Del to lock your server. Oops… Did it reboot? Edit /etc/inittab and either comment out or alter the following line:

ca::ctrlaltdel:/sbin/shutdown -t3 -r now

That entry tells your Linux to do a reboot and is not at all what you want 99% of the time. To make this entry valid at once, write

init q

This tells the system to reread the /etc/inittab file.

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Reboot vs restart

posted by Knut Torgersen

Feb 1

If you need to clear the system and restart a lot of services, and if you are under contract for uptime, do not reboot. Instead, change runlevels: init 1; init 3 will clear out most error conditions and bring up the system clean. Technically, your system has not been down. It is faster, too.

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Restarting your netcard

posted by Knut Torgersen

Nov 30

If you have made changes to your netcard, you can either reboot or restart the netcard service. The latter is of course what you should do and here is how: Log in as root and run the following:

/etc/rc.d/init.d/network restart

Your netcard will reply something like the following:

Shutting down interface eth1: [ OK ] Shutting down loopback interface: [ OK ] Bringing up loopback interface: [ OK ] Bringing up interface eth0: Determining IP information for eth0... failed; no link present. Check cable? [FAILED] Bringing up interface eth1: Determining IP information for eth1... done. [ OK ]

Now, your netcard is up and running with the new settings and should work properly. Note: This is the Fedora/Red Hat way and other distros may have other solutions. And, yes, your netcard does fail if you do not have a cable connected to it. In the example above, eth0 does not have a cable and eth1 is the wireless one.

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Installing Fedora 8 on a HP Pavilion DV4163ea

posted by Knut Torgersen

Nov 22

Some PCs in the DV4000 series experience problems installing Fedora 8. When selecting to install or upgrade, the installation script starts loading various items, and then hangs at Loading /sbin/loader.

Restart your PC, it is dead to the world, anyway
Select the option you want and hit the Tab key
At the command line (after vmlinuz) type floppy.allowed_drive_mask=0 clocksource=acpi_pm and hit Enter.

The installation should now work as expected.

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Archive for the ‘Linux’ Category

yum (or any other web dependent console app)

Eeebuntu/Ubuntu and others that use sudo

Getting contact with the Neo Freerunner from Windows

sudo

X forwarding – or using X applications on your Windows PC

last

Ctrl+Alt+Del

Reboot vs restart

Restarting your netcard

Installing Fedora 8 on a HP Pavilion DV4163ea