users February 2007

users@lists.fedoraproject.org

547 participants
836 discussions

Getting grub splash screen back
by Paul Smith 27 Feb '07

27 Feb '07

Dear All I have changed grub configuration and now I do not have the usual grub splash screen. How can I have it back? Thanks in advance, Paul

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firefox2
by Craig 27 Feb '07

27 Feb '07

Did anyone make a rpm that work with fc5?I been looking all over the place for one. ____________________________________________________________________________________ Do you Yahoo!? Everyone is raving about the all-new Yahoo! Mail beta. http://new.mail.yahoo.com

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accessing shell when gnome locks up.
by Larry Kelly 27 Feb '07

27 Feb '07

I have Fedora6 with VIA chipset onboard video and Gnome. Many of the installed applications will freeze the display screen, and mouse. When this happens is there a Gnome keyboard shortcut that will give me access to a shell prompt, so that I can kill the offending process, or restart X windows. Right now, my only option is to turn the power off. -- Best Regards, -Larry "Work, work, work...there is no satisfactory alternative." --- E.Taft Benson

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Dell says all aboard for Linux PCs
by taharka 27 Feb '07

27 Feb '07

Dell says all aboard for Linux PCs By Stan Beer Monday, 26 February 2007 PC maker Dell has announced that it has commenced a program that will result in the sale and distribution of a range of computers with pre-installed Linux distributions instead of Microsoft Windows. Dell has indicated that Novell's Suse Linux will be first cab off the rank. Full article at; http://www.itwire.com.au/content/view/9951/53/ taharka Lexington, Kentucky U.S.A.

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Aspell not working in Kate (kde)
by Dotan Cohen 27 Feb '07

27 Feb '07

Although after installing FC6 on my Dell laptop I was able to use Aspell in Kate, I can no longer use it. Kate complains that aspell may not be installed, or may not be in my path. However, I can call "man aspell" from the command line and get the usage information, and in Open Office it works fine. So why can't kate find the required components, and how can I convince her to find them? Thanks in advance. Dotan Cohen http://what-is-what.com/what_is/ajax.html http://easyanswers.info

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2007 DST Change
by Travis Bullock 27 Feb '07

27 Feb '07

Sorry if this is a repost. Just subscribed and not sure if the first one went or not. Does anyone have a procedure that describes the process for updating my Fedora Core 2, 4 and 5 implemenations in regards to the DST changes in US/Canada? I am having no luck finding a valuable guide via the Web. Cheers, Travis Bullock Systems Administrator Avmax Group Inc.

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fc6: telnetd refuses connections if nameserver is down
by Dario Lesca 27 Feb '07

27 Feb '07

Hi, in FC6, the telnetd service refuse the connection if the nameserver is down. (see this bug): https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=223448 But in this tread: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=221583 people say witch this problem is not a bug .... In previous fc version, if the nameserver is down, the connection is however accepted . Someone can give me more information to this issue?. It will be resolved (or not) in future? Many thanks. -- Dario Lesca <d.lesca(a)solinos.it>

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Re: How much swap?
by Kwan Lowe 27 Feb '07

27 Feb '07

> From: Gordon Messmer <yinyang(a)eburg.com> > Subject: Re: How much swap? > > Uno Engborg wrote: >> >> Would I need a swap anyway. There is some old rule of thumb to have >> twice as much virtual memory as you have physical RAM, but that >> sounds a bit ridiculous as it would take a lot of time to swap >> in/out this much memory from disk. > > I used to think it was kind of ridiculous, myself, until I discovered a > quirk of Posix's behavior. If I get any of these details wrong, I > invite corrections: > > When a process called fork() on an old unix system, the OS required an > amount of free memory equal to the size of the process, plus the size of > a process table entry. If this memory wasn't free, fork() would fail. > After fork(), the OS would copy the full set of memory from the parent > process to the new process. Since fork() is so often followed by > exec(), which throws away all of that memory, modern unix systems don't > copy the whole set of memory when a process forks. However, they still > require that there is enough memory to do so (at least normally; Linux > has an "overcommit" feature that you can enable). Not sure if the fork/exec issue applies to paged memory versus swap (i.e., where the entire process is swapped versus memory pages). It's been a long time for me too :D I'm also not certain if this applies to Linux, but I recall that certain other Unices require twice the page space as physical RAM depending on configurations. For example, some OSes will automatically write to both the in-memory pages and the corresponding page on disk. The idea being that if the in-memory page needs to paged out, it can do so with just an update to the page table rather than a full write. This makes a page-out instantaneous. I understand that in certain VM implementations it was simpler to just have a direct mapped copy of all pages on disk. This required that in order to increase the available memory (real + VM) you'd need at least as much page space as you had real memory. With very large memory systems (above 4G for example), there are probably other considerations. The size of the page table on a 32-bit system may be fixed, but on machines with huge memories, the page table itself may grow/shrink. The consequence is that trying to allocate too large a page area could end up shrinking your usable physical memory. On an already loaded system that's near capacity adding page space could cause worse problems. I'm not sure that I'd run entirely without page space, however. I seem to recall that unused pages can get paged out entirely. I.e., if the process is not doing much it won't cause a memory hit. Also keep in mind that 8G of disk space may not be all that much relative to the size of disks today. That is, 32M of page/swap space back in the day, was probably relatively more than 8G today. > With 8GB of RAM, that may not affect you directly, but it may, too. > Lets say that you have no swap, and you were using a 3d modeler, or > high-end graphics package. If that application was using 5GB of your 8, > and needed to launch a helper application, like an out-of-process perl > or python script, it wouldn't be able to do so. Even though that script > only needs a few MB of the GB you have free, the parent is too big to > fork(), so it can't spawn new processes. > > So, when you decide whether or not to follow the traditional advice > offered about the amount of swap to allocate, you should first > understand how the Linux VM works: > http://www.redhat.com/magazine/001nov04/features/vm/ > > ...if you don't want to spend the time learning the details, I'd just > stick with the advice offered. > Take all statements with a grain of salt. I'm old and doddering now, and bit rot has surely set in on my recollections. -- * The Digital Hermit http://www.digitalhermit.com * Unix and Linux Solutions kwan(a)digitalhermit.com

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Re: Authenticate `su -` through PAM and SSH Agent
by Gordon Messmer 27 Feb '07

27 Feb '07

jlist(a)jdjlab.com wrote: > I don't want to allow root logins at all over ssh (is localhost treated > specially then?). Security and all. I know I can't do it with the > default PAM plugins available, but if anybody has a link to where a > plugin would give that functionality that'd be great. If nobody knows of > one, I'd really appreciate links to a good tutorial on how PAM plugins > work and a tutorial/documentation of the ssh-agent workings/protocol. I > may find time to write one myself this coming summer. Before you start work on the project, you should work out the logic of how this is supposed to work. If google is any indication, ideas like this one float around from time to time, but the existing pam_ssh module doesn't do quite what you're describing. So, how would you support what you want to do, logically? First of all, you want to be able to log in to a user account via ssh using keys, right? So, if "user1" is your account, you'd have to install the public key in that user's home directory on the host to which you want to log in. That's easy enough, and supported by the software that already exists. Now, once there, you want to be able to "su" to root using ssh keys. How's the system going to handle that? Private keys can only be authenticated against the public key, so where's the public key that the system is going to use? If it's in your own home directory, then any user can add a key and "su" to root. If it's in the root user's home directory, then what you want is not really functionally different from using "ssh root@localhost". The only real gain that you get is disallowing remote root logins. If you're concerned about brute-force attacks, you're better off allowing remote root logins, but not allowing password logins. Turn off password logins, and allow only key based authentication. You could improve security further by configuring your firewall so that only connections from specific IP addresses are allowed.

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Disk saturation
by Carlos H. Reimer 27 Feb '07

27 Feb '07

Hi, Our database server is getting some very high response times and I´m trying to understand if the disk configuration is responsible for this issue. It is a Fedora Core release 4 (Stentz) box with 4 GB RAM and 2 GenuineIntel XEON CPU 3.20 GHz Cache: 1024 KB. Some typical iostat -x data: cpu-moy: %user %nice %sys %iowait %idle 11,96 0,00 7,04 1,31 79,70 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util sda 0,00 30,44 0,81 3,43 14,52 270,97 7,26 135,48 67,43 0,19 46,05 7,29 3,08 cpu-moy: %user %nice %sys %iowait %idle 12,26 0,00 7,34 6,63 73,77 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util sda 0,00 32,26 0,00 4,41 0,00 293,39 0,00 146,69 66,55 1,51 342,32 25,14 11,08 cpu-moy: %user %nice %sys %iowait %idle 13,67 0,00 6,83 7,74 71,76 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util sda 0,00 31,99 0,00 3,82 0,00 286,52 0,00 143,26 74,95 2,93 767,58 55,84 21,35 cpu-moy: %user %nice %sys %iowait %idle 13,27 0,00 6,83 14,37 65,53 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util sda 0,00 31,73 0,00 4,02 0,00 285,94 0,00 142,97 71,20 2,73 680,40 49,25 19,78 cpu-moy: %user %nice %sys %iowait %idle 12,86 0,00 6,33 9,45 71,36 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util sda 0,00 30,92 0,00 3,41 0,00 274,70 0,00 137,35 80,47 2,33 681,35 57,53 19,64 cpu-moy: %user %nice %sys %iowait %idle 12,45 0,00 6,02 1,91 79,62 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util sda 0,00 33,00 0,60 4,23 6,44 297,79 3,22 148,89 63,00 0,41 85,29 20,00 9,66 Is it normal have the %util column showing a saturation of 20% with only 140wKB/s? How can I be sure if there is a hardware or software raid running over the disks? I think it is hardware because there is no mdadm process running, am I right? Some dmesg data: SCSI subsystem initialized Fusion MPT base driver 3.01.20 Copyright (c) 1999-2004 LSI Logic Corporation ACPI: PCI Interrupt 0000:02:04.0[A] -> GSI 42 (level, low) -> IRQ 185 mptbase: Initiating ioc0 bringup ioc0: 53C1030: Capabilities={Initiator,Target} Fusion MPT SCSI Host driver 3.01.20 scsi0 : ioc0: LSI53C1030, FwRev=01032300h, Ports=1, MaxQ=255, IRQ=185 input: AT Translated Set 2 keyboard on isa0060/serio0 input: AT Translated Set 2 keyboard on isa0060/serio0 megaraid cmm: 2.20.2.5 (Release Date: Fri Jan 21 00:01:03 EST 2005) megaraid: 2.20.4.5 (Release Date: Thu Feb 03 12:27:22 EST 2005) megaraid: probe new device 0x1000:0x1960:0x1028:0x0520: bus 2:slot 5:func 0 ACPI: PCI Interrupt 0000:02:05.0[A] -> GSI 37 (level, low) -> IRQ 193 megaraid: fw version:[351S] bios version:[1.10] scsi1 : LSI Logic MegaRAID driver scsi[1]: scanning scsi channel 0 [Phy 0] for non-raid devices Vendor: SDR Model: GEM318P Rev: 1 Type: Processor ANSI SCSI revision: 02 scsi[1]: scanning scsi channel 1 [virtual] for logical drives Vendor: MegaRAID Model: LD 0 RAID1 69G Rev: 351S Type: Direct-Access ANSI SCSI revision: 02 SCSI device sda: 143114240 512-byte hdwr sectors (73274 MB) sda: asking for cache data failed sda: assuming drive cache: write through SCSI device sda: 143114240 512-byte hdwr sectors (73274 MB) sda: asking for cache data failed sda: assuming drive cache: write through sda: sda1 sda2 sda3 sda4 < sda5 > Attached scsi disk sda at scsi1, channel 1, id 0, lun 0 libata version 1.10 loaded. ata_piix version 1.03 ACPI: PCI Interrupt 0000:00:1f.2[A] -> GSI 18 (level, low) -> IRQ 177 PCI: Setting latency timer of device 0000:00:1f.2 to 64 ata1: SATA max UDMA/133 cmd 0xBC98 ctl 0xBC92 bmdma 0xBC60 irq 177 ata2: SATA max UDMA/133 cmd 0xBC80 ctl 0xBC7A bmdma 0xBC68 irq 177 ata1: SATA port has no device. scsi2 : ata_piix ata2: SATA port has no device. scsi3 : ata_piix isa bounce pool size: 16 pages kjournald starting. Commit interval 5 seconds EXT3-fs: mounted filesystem with ordered data mode. SELinux: Disabled at runtime. SELinux: Unregistering netfilter hooks cfq: depth 4 reached, tagging now on Attached scsi generic sg0 at scsi1, channel 0, id 6, lun 0, type 3 Attached scsi generic sg1 at scsi1, channel 1, id 0, lun 0, type 0 Floppy drive(s): fd0 is 1.44M Thank you in advance! Reimer

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