- Roundtable - muug.ca

Fedora virtual screen
by schwartz 16 May '06

16 May '06

Is there a way to get a virtual screen with Fedora? Is there someplace on the web that tells how?

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Binding device names to MAC addresses
by Adam Thompson 10 May '06

10 May '06

Further to the discussion about binding ethernet devices to specific ethernet cards... I appear to have been mistaken - I cannot find any consistent way to tell the kernel to attach "eth0" to, say the device "02:01.0" (which in my system is: Ethernet controller: Intel Corporation 82540EM Gigabit Ethernet Controller (rev 02)"). If you use hotpluggable devices (e.g. USB ethernet adapters) then there may be a way but that's through the hotplug scripts, not through the kernel. However, the mechanism for mapping specific hardware MAC addresses to device names (eth0, eth1, eth2, etc.) is actually quite straightforward. /sbin/nameif (from net-tools) and /sbin/ifrename (from wireless-tools) both do the same trick, as far as I can tell. I have no idea how it massages kernel innards in this way, but whatever - it apparently just works. -Adam Thompson athompso-muug(a)athompso.net

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Mac OS X Boot Time Keyboard short cuts (fwd)
by gedetil＠cs.umanitoba.ca 10 May '06

10 May '06

Hi folks. Just passing along this message from Doug Hamilton... -- Gilbert E. Detillieux E-mail: <gedetil(a)cs.umanitoba.ca> Dept. of Computer Science Web: http://www.cs.umanitoba.ca/~gedetil/ University of Manitoba Phone: (204)474-8161 Winnipeg MB CANADA R3T 2N2 Fax: (204)474-7609 ---------------------------------------------------------------------------- To: Gilbert Detillieux <gedetil(a)cs.umanitoba.ca> From: Doug Hamilton <doug_hamilton(a)umanitoba.ca> Subject: Mac OS X Boot Time Keyboard short cuts Date: Tue, 9 May 2006 23:48:40 -0500 Hi Gilbert, There was a request by one of the members that I submit to the MUUG mail-list some of the commonly used Mac OS X keyboard short cuts which can be used at boot time. Since I'm not a member of the MUUG mail-list, I thought I could submit them to you, and when you have a moment you could submit them for me. 1.) Boot into Single User Mode: Apple + S keys 2.) Boot using a bootable CD/DVD already placed into the main optical drive (includes non Mac OS X disks): Apple + C keys 3.) Eject all removal media of all drives: Mouse Button 4.) List all bootable volumes via built-in boot manager (this includes bootable Mac OS X network volumes): Alt/Option key For the keyboard combinations to work, they must be pressed and held down after the initial boot chime is heard, and must continue to be held until the desired option appears (e.g. Single User Mode, keep holding the Apple+S keys until the terminal prompt appears). It was an very informative evening, the MythTV presentation was very interesting. Regards, Doug ------------- Doug Hamilton, BA, MA, APP Senior Computer Consultant Computers-on-Campus; Univ. of Manitoba 204-474-6196 (Ph.) 204-474-7556 (Fax) http://www.umanitoba.ca/bookstore/

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fuse
by Bill Reid 10 May '06

10 May '06

I just tried out sshfs and it works great. yum install fuse-sshfs is all that is required to get it going on FC5. Thanks Scott for an excellent presentation and making me aware of Fuse and sshfs. -- Bill

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Expanding hard drive to utilized unused space
by John Lange 04 May '06

04 May '06

I have a system built on a Linux raid 1 using ext3. When the system was created there was a large amount of space left available on both of the raid 1 disks for future expansion of a partition as required. I know expanding the file system using LVM is relatively trivial but this system was not built using LVM. Is it possible to expand the partitions, expand the RAID 1 to fill the partitions, and then expand the ext3 file system on the RAID1? -- John Lange OpenIT ltd. www.Open-IT.ca (204) 885 0872 VoIP, Web services, Linux Consulting, Server Co-Location

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MUUG Meeting, May 9, 7:30pm -- A MythTV Implementation
by gedetil＠cs.umanitoba.ca 02 May '06

02 May '06

The Manitoba UNIX User Group (MUUG) will be holding its next monthly meeting on Tuesday, May 9. The meeting topic for this month is as follows: A MythTV Implementation MythTV is a popular open-source TV-recording package. Combined with the right hardware and configured correctly, it can take the stress out of keeping up with your favourite shows, despite frequent schedule changes and re-runs. Kevin McGregor will talk about his experiences setting up MythTV on Ubuntu Linux. The group holds its general meetings at 7:30pm on the second Tuesday of every month from September to June. (There are no meetings in July and August.) Meetings are open to the general public; you don't have to be a MUUG member to attend. ********************************************************************** Please note our meeting location: The IBM offices, at 400 Ellice Ave. (between Edmonton and Kennedy). When you arrive, you will have to sign in at the reception desk, and then wait for someone to take you (in groups) to the meeting room. Please try to arrive by about 7:15pm, so the meeting can start promptly at 7:30pm. Don't be late, or you may not get in. (But don't come too early either, since security may not be there to let you in before 7:15 or so.) Limited parking is available for free on the street, or in a lot across Ellice from IBM, for $1.00 for the evening. Indoor parking is also available nearby, at Portage Place, for $3.00 for the evening. Bicycle parking is available in a bike rack under video surveillance located behind the building on Webb Place. ********************************************************************** For more information about MUUG, and its monthly meetings, check out their Web server: http://www.muug.mb.ca/ Also note that MUUG maintains two mailing lists, called "muug-announce" and "roundtable". If you're not already on these lists, we encourage you to subscribe now: http://www.muug.mb.ca/mailman/listinfo/ The "muug-announce" list is used for monthly meeting announcements (such as this one) as well as other important announcements of interest to MUUG members. The "rountable" list is meant to be a forum for follow-ups to topics discussed at the meetings, or for round-table-style discussion on other topics that come up between meetings. Of course, for this to be effective, we need to reach a certain critical mass. So, please subscribe, and stay involved! -- Gilbert E. Detillieux E-mail: <gedetil(a)muug.mb.ca> Manitoba UNIX User Group Web: http://www.muug.mb.ca/ P.O. Box 130, St-Boniface Phone: (204)474-8161 Winnipeg MB CANADA R2H 3B4 Fax: (204)474-7609

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Re: [RndTbl] TTY1 and Starting X Windows
by gedetil＠cs.umanitoba.ca 19 Apr '06

19 Apr '06

According to Montana Quiring: > Good information. Thanks. > > If I put this line in /etc/inittab: > x:2:respawn:/usr/X11R6/bin/startx > tty1 > or > x:2:respawn:/usr/X11R6/bin/startx > > I get this error after it boots up: > /usr/X11R6/bin/startx: line xxx: xinit: command not found > /usr/X11R6/bin/startx: line xxx: xauth: command not found > (xxx being a number in the 100's) > > This led me to look at the startx script and I figured out that xauth and > xinit were scripts in /usr/X11R6/bin/ that were not in the path when > inittab was being run. > > So I edited startx and made the first line: > export PATH=$PATH:/usr/X11R6/bin/ > > Now X starts but it starts as root. *Insert frown here* > I guess this makes sense because inittab is run as root, right? That's correct. But wasn't that the case all along? I.e. when you ran "/bin/bash -login" from inittab, and it called startx from .bash_profile, that was all running as root as well? But, I can see why you'd want to change that... > So I edited the /etc/inittab again and changed the line to: > x:2:respawn:/usr/bin/sudo -H -u me /usr/X11R6/bin/startx > > and I added this to sudoers: > me ALL=NOPASSWD: /usr/X11R6/bin/startx > > but I get this error on bootup: > X: user not authorized to run the X server, aborting. > xinit: Server error. > > Gee wizz this has been a pain. That's strange. I wonder what would happen on this machine if a non-root user logged in (on a virtual console tty) and ran startx from a shell prompt? I'm not sure why that would work if the above sudo command doesn't... I wonder if console (or some other device) ownership is the issue? You may need to set up a wrapper script which first sets device ownership correctly, using pam_console_apply (if it's there) or a bunch of chown commands, then does the sudo command, then finally (maybe) resets device ownerships after the startx is finished. -- Gilbert E. Detillieux E-mail: <gedetil(a)cs.umanitoba.ca> Dept. of Computer Science Web: http://www.cs.umanitoba.ca/~gedetil/ University of Manitoba Phone: (204)474-8161 Winnipeg, MB, CANADA R3T 2N2 Fax: (204)474-7609

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Re: [RndTbl] TTY1 and Starting X Windows
by gedetil＠cs.umanitoba.ca 19 Apr '06

19 Apr '06

According to Montana Quiring: > Thanks for all the info Gilbert. You put me on the right path. > I found that if I put: > startx; kill -9 $$ > in the ~/.bash_profile > It goes to a login prompt instead of a BASH prompt after the user presses > Control+C, so that's a temp workaround. There's a possible race condition there, I think, so it's perhaps not the safest way to do it. Using "exec startx" might be better, since startx would then replace the login shell, so there's no bash prompt (since there's no more login shell) to return to. > I would like to get your suggestion working in /etc/inittab > I put the line: > x:5:respawn:/usr/X11R6/bin/startx > in my /etc/inittab after the other getty TTY's > ...but like you said it looks like I need to redirect it to a tty, as X > does not start up. > I've been googling trying to figure out how to do that, but no dice yet. > If you can give me a hint I'd appreciate it. I don't think the tty is strictly needed here. See below... > This is what is in my /etc/inttab: > id:2:initdefault This says the default run level is 2, so only inittab entries with a 2 in their run level list will be considered... > ....the rc scripts setup and stuff... > 1:2345:respawn:/sbin/getty 38400 tty1 > 2:23:respawn:/sbin/getty 38400 tty2 These will work, since 2 is among their list of run levels. > x:5:respawn:/usr/X11R6/bin/startx > tty1 This line will only work at run level 5, so you can either... - change that to a 2, so it runs at the default run level, - change the initdefault line to use run level 5, but that might break other things... - have a command run somewhere at the end of all the run level 2 stuff, which says "/sbin/init 5" to change the run level. That's rather convoluted, though. (But it's similar to what Solaris's init scripts do.) > Thanks for your patience. I haven't worked with inittab much in the past, > so this has been a real learning experience for me. It's worth a careful read of the init(8) and inittab(5) man pages, to better understand the concepts behind it. After than, the setup makes more sense. -- Gilbert E. Detillieux E-mail: <gedetil(a)cs.umanitoba.ca> Dept. of Computer Science Web: http://www.cs.umanitoba.ca/~gedetil/ University of Manitoba Phone: (204)474-8161 Winnipeg, MB, CANADA R3T 2N2 Fax: (204)474-7609

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Re: [RndTbl] xinit doesn't notice my .xinitrc via xdm
by gedetil＠cs.umanitoba.ca 19 Apr '06

19 Apr '06

According to Sean Cody: > First of all this is under OpenBSD 3.9 but that should be immaterial > to the issue. > > Basically if I run startx from a shell X starts and my .xinitrc is > parsed/executed and all is well. > Since I'm using X more I decided to enable xdm (via echo > "xdm_flags="" > /etc/rc.conf.local; reboot; ) instead of launching > manually from a shell. > Now when I log in through XDM my .xinitrc isn't parsed/executed and I > have to run it manually (fvwm notices my .fvwmrc so that part is > working as expected). > > I'm not doing anything too complex and everything is rather 'stock' > with changes to the default install are overridden in my home > directory such as .Xdefaults and .fvwmrc . I'm using .xinitrc to set > a pretty background (via xv(l) and to start an ssh-agent) > > Any ideas on how I can figure this out? > I should probably investigate how XDM is launched and actually read > the startx script, but I'm going to gamble on someone else already > knowing why this happens. Essentially, .xinitrc is only used by the startx script, which invokes xinit. It's not used by any of the typical X display managers (xdm, kdm, gdm, etc.). They typically have a different set of startup scripts they use. In the case of xdm, there are system-wide startup, session and reset scripts, which are specified in a resource file (typically, these are called Xstartup, Xsession, and Xreset, and the resource file is xdm-config, all located in the same system-wide directory). The startup and reset scripts are always run as root, and are used (as their names suggest) to do special tasks before and after the session is run. Furthermore, the Xsession file (which is run as the logged-in user) will typically look for and exec a user-specific ~/.xsession file. If what you're doing in your .xinitrc file is fairly generic, you can probably link it to .xsession as well, to use the one script for both environments (startx/xinit and xdm/kdm/whatever). Of course, you'll want to look at the system-wide session script for your display manager, to make sure it does look for a user-specific script, and if so, which one. -- Gilbert E. Detillieux E-mail: <gedetil(a)cs.umanitoba.ca> Dept. of Computer Science Web: http://www.cs.umanitoba.ca/~gedetil/ University of Manitoba Phone: (204)474-8161 Winnipeg, MB, CANADA R3T 2N2 Fax: (204)474-7609

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Re: [RndTbl] TTY1 and Starting X Windows
by gedetil＠cs.umanitoba.ca 19 Apr '06

19 Apr '06

According to Montana Quiring: > Hello, > > Thanks for your feedback at the last MUUG meeting about the problem I had > with Control+C droping someone to a shell prompt in the forst TTY. > > I had a google group thread here if you want to read/respond there: > http://groups.google.ca/group/ubuntu_lite/browse_thread/thread/11b044eeebe0… If you read this thread to the end, you'll see that the X server is launched from within root's ~/.bash_profile, which would explain why you see this problem... > I changed the line in /etc/inittab from: > 1:2345:respawn:/bin/bash -login > /dev/tty1 2>&1 < /dev/tty1 > to: > 1:2345:respawn:/sbin/getty 38400 tty1 > > and that solves to problem of getting to a shell but now X Windows doesn't > start. > > I don't fully understand what the orig line is doing and I think that's my > problem. As Bill mentioned, the redirect stuff is what you see at the end of the line. however, the /bin/bash -login is the key part here. The -login option forces bash to treat this as a login shell, and read the .bash_profile for the logged-in user (root in this case, since init runs as root, and nothing has been done to change to a different userid). This strikes me as a roundabout way of doing things, and also (as you've discovered) not very bullet-proof. I'd recommend you change the .bash_profile to not start the X server from there, but rather start it in its own line in /etc/inittab, such as this... x:5:respawn:/usr/X11R6/bin/startx Decide which runlevel(s) is/are appropriate for this system, of course. Also, you may want to just use the command line you've commented out of the .bash_profile, if it's different than the startx above, but you will need to specify the full path name of the command explicitly, I believe. Also note that commands started in inittab aren't automatically bound to a tty (such as a virtual console), so you might need to explicitly do so using redirects (as they did for the bash -login). That's not necessary when you invoke getty, since you specify a tty as a command line argument to it, and it's job is to set up a process group bound to the tty. This likely won't matter in the case of X, but if you want to debug or check output from the X server or clients, then you should redirect it somewhere (a log file if not a virtual console). -- Gilbert E. Detillieux E-mail: <gedetil(a)cs.umanitoba.ca> Dept. of Computer Science Web: http://www.cs.umanitoba.ca/~gedetil/ University of Manitoba Phone: (204)474-8161 Winnipeg, MB, CANADA R3T 2N2 Fax: (204)474-7609

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