Discuss July 2009

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276 discussions

Re: [CentOS] Grub fallback problem
by Matthias Blankenhaus 30 Jul '09

30 Jul '09

Let's try this again :) I am running CentOS 5 (core pkgs) / x86_64 using grub 0.97 and I am trying to configure a fallback between two partitions on my local disk, each installed with a CentOS image. The idea is to be able to install a new test OS image and fall back in case of a problem to the default image. This is a great grub feature ! Except it does not work for me :( grub.conf: #----------------------------------------------- default saved timeout=5 fallback 1 title NEW OS root (hd0,0) kernel /boot/vmlinuz-new root=/dev/sda1 panic=5 initrd /boot/initrd-new.img savedefault fallback title DEFAULT OS root (hd0,1) kernel /boot/vmlinuz-default root=/dev/sda2 initrd /boot/initrd-default.img savedefault #----------------------------------------------- Grub is installed on /dev/sda1, but not on /dev/sda2. /dev/sda1 is the primary boot partition. Both partitions are formatted with ext3. The problem is that the fallback does not work for me. For instance, if I specify on purpose a wrong root device with the NEW OS, e.g. root=/dev/sda3, then the kernel panics and reboots properly after 5 sec. However, grub then attempts to boot the NEW OS all over again. The same is true when I fully boot NEW OS with the right root device and then panic the kernel on purpose. Now, I have read somewhere that grub requires a default file to get the savedefault feature working. However, I could neither find the 'savedefault' command nor the grub default file under /boot/grub or anywhere else. One more thing, when I choose the boot title manually then grub seems to remember my last choice. In other words, grub is preserving my last choice from a previous boot. Am I doing something wrong ? Do I need to install something in addition to grub 0.97 ? Your help is much appreciated, Matthias --- On Wed, 7/29/09, Matthias Blankenhaus <matthiasblankenhaus(a)yahoo.com> wrote: > From: Matthias Blankenhaus <matthiasblankenhaus(a)yahoo.com> > Subject: Grub fallback problem > To: centos(a)centos.org > Date: Wednesday, July 29, 2009, 11:19 AM > Hi ! > > I am running CentOS 5 using grub 0.97 > > > >

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SNMP
by David Leon 30 Jul '09

30 Jul '09

Hi guys I'm trying to set up the SNMP service. I need it to use MRTG to graph some variables of my Centos 5.3 box. Any of you have a working SNMP configuration can send me to tweak mine? Thanks David

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LSI MegaRAID system status
by Raymond Lillard 30 Jul '09

30 Jul '09

Dear list, I have inherited a CentOS-5 box with a LSI Sata Raid controller. It is configured as a RAID5 w/hot-standby. My concern is that I have no present means of determining the RAID status w/o downing the system and going into the bios to get status. If a disk has failed and brought the standby disk online, I would like to know about it, the day it happens by seeing it in syslog or getting an e-mail message. The only solution I have found is on the LSI web-site. It is tool called "MegaMon for Linux". It most recent release was in 2005 and it requires that I use their driver. Just the package title gives me chills. It runs as a daemon and is almost constantly polling the h/w . I would much prefer a simple command line tool that I can wrap a script around and run it under cron. My questions are: 1. Does anyone know of a command line tool ? 2. Failing a positive response to #1, has anyone any experience with "MegaMon for Linux", good or otherwise ? Thanks to all, Ray The h/w is a dual Opteron dual-core system with lots of memory. The relevant dmesg lines and lspci output are shown below: dmesg: megaraid cmm: 2.20.2.7 (Release Date: Sun Jul 16 00:01:03 EST 2006) megaraid: 2.20.5.1 (Release Date: Thu Nov 16 15:32:35 EST 2006) megaraid: probe new device 0x1000:0x0409:0x1000:0x3008: bus 3:slot 14:func 0 GSI 17 sharing vector 0xA8 and IRQ 17 ACPI: PCI Interrupt 0000:03:0e.0[C] -> GSI 18 (level, low) -> IRQ 17 megaraid: fw version:[814B] bios version:[H431] scsi5 : LSI Logic MegaRAID driver scsi[5]: scanning scsi channel 0 [Phy 0] for non-raid devices scsi[5]: scanning scsi channel 1 [virtual] for logical drives Vendor: MegaRAID Model: LD 0 RAID5 1144G Rev: 814B Type: Direct-Access ANSI SCSI revision: 02 *SCSI device sdc: 2343745536 512-byte hdwr sectors (1199998 MB) *sdc: Write Protect is off *sdc: Mode Sense: 00 00 00 00 *sdc: asking for cache data failed *sdc: assuming drive cache: write through *SCSI device sdc: 2343745536 512-byte hdwr sectors (1199998 MB) *sdc: Write Protect is off *sdc: Mode Sense: 00 00 00 00 *sdc: asking for cache data failed *sdc: assuming drive cache: write through * sdc: sdc1 sdc2 sdc3 *sd 5:1:0:0: Attached scsi disk sdc lspci -v 03:0e.0 RAID bus controller: LSI Logic / Symbios Logic MegaRAID (rev 0a) Subsystem: LSI Logic / Symbios Logic MegaRAID SATA 300-8X RAID Controller Flags: bus master, stepping, 66MHz, medium devsel, latency 64, IRQ 17 Memory at cfcf0000 (32-bit, prefetchable) [size=64K] Memory at fe500000 (32-bit, non-prefetchable) [size=1M] Expansion ROM at fe4e0000 [disabled] [size=128K] Capabilities: [c0] Power Management version 2 Capabilities: [d0] Message Signalled Interrupts: 64bit+ Queue=0/1 Enable- Capabilities: [e0] PCI-X non-bridge device

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Color Coded Labels (Like OSX)
by Christopher Rushton 30 Jul '09

30 Jul '09

Hi, I was wondering if there was a way to do something similar to Mac OSX color label, where you can highlight a file or group of files and assign them a color, making different files more obvious. For example, my files which are finished with are colored green and those which haven't been worked on are red, etc. This means, even with files of the same type, I can clearly see which ones need work doing to them. I'm not expecting you to do it or even explicitly explain how it would be done, just a pointer to the right files and any quick thoughts you might have about implementing a system like this will do!

2 2

out of memory
by Jerry Geis 30 Jul '09

30 Jul '09

I am getting this message quite often lately. Centos 5.3, AMD dual core 5050e system x64 1 GIG ram, 4 GIG swap I dont have that much running that the kernel should be cutting out my processes. Any thoughts? Jerry ------------ emTotal: 766264 kB MemFree: 583984 kB Buffers: 9572 kB Cached: 31004 kB SwapCached: 36280 kB Active: 20240 kB Inactive: 59780 kB HighTotal: 0 kB HighFree: 0 kB LowTotal: 766264 kB LowFree: 583984 kB SwapTotal: 4096564 kB SwapFree: 3932136 kB Dirty: 12 kB Writeback: 0 kB AnonPages: 13184 kB Mapped: 16340 kB Slab: 22428 kB PageTables: 13980 kB NFS_Unstable: 0 kB Bounce: 0 kB CommitLimit: 4479696 kB Committed_AS: 442124 kB VmallocTotal: 34359738367 kB VmallocUsed: 280856 kB VmallocChunk: 34359457495 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 Hugepagesize: 2048 kB 096kB = 3424kB Node 0 Normal: empty Node 0 HighMem: empty 46 pagecache pages Swap cache: add 8934611, delete 8934611, find 7869746/7929974, race 11+11 Free swap = 0kB Total swap = 4096564kB Free swap: 0kB 196064 pages of RAM 13511 reserved pages 5948 pages shared 0 pages swap cached kthread invoked oom-killer: gfp_mask=0xd0, order=1, oomkilladj=0 Call Trace: [<ffffffff800c3a6a>] out_of_memory+0x8e/0x2f5 [<ffffffff8000f2eb>] __alloc_pages+0x245/0x2ce [<ffffffff8002303f>] alloc_page_interleave+0x3d/0x74 [<ffffffff8003c061>] __get_free_pages+0xe/0x71 [<ffffffff8001eb82>] copy_process+0xc6/0x15b8 [<ffffffff8009b8bc>] alloc_pid+0x1ee/0x28a [<ffffffff80030cdb>] do_fork+0x69/0x1c1 [<ffffffff8009d98c>] keventd_create_kthread+0x0/0xc4 [<ffffffff8005df3d>] kernel_thread+0x81/0xeb [<ffffffff8009d98c>] keventd_create_kthread+0x0/0xc4 [<ffffffff80032282>] kthread+0x0/0x132 [<ffffffff8005dfa7>] child_rip+0x0/0x11 [<ffffffff8009d9a9>] keventd_create_kthread+0x1d/0xc4 [<ffffffff8004d159>] run_workqueue+0x94/0xe4 [<ffffffff800499da>] worker_thread+0x0/0x122 [<ffffffff80049aca>] worker_thread+0xf0/0x122 [<ffffffff8008a4b3>] default_wake_function+0x0/0xe [<ffffffff80032380>] kthread+0xfe/0x132 [<ffffffff8005dfb1>] child_rip+0xa/0x11 [<ffffffff80032282>] kthread+0x0/0x132 [<ffffffff8005dfa7>] child_rip+0x0/0x11 Mem-info: Node 0 DMA per-cpu: cpu 0 hot: high 0, batch 1 used:0 cpu 0 cold: high 0, batch 1 used:0 cpu 1 hot: high 0, batch 1 used:0 cpu 1 cold: high 0, batch 1 used:0 Node 0 DMA32 per-cpu: cpu 0 hot: high 186, batch 31 used:146 cpu 0 cold: high 62, batch 15 used:47 cpu 1 hot: high 186, batch 31 used:18 cpu 1 cold: high 62, batch 15 used:55 Node 0 Normal per-cpu: empty Node 0 HighMem per-cpu: empty Free pages: 5652kB (0kB HighMem) Active:78394 inactive:78664 dirty:0 writeback:0 unstable:0 free:1413 slab:5343 mapped-file:6627 mapped-anon:157109 pagetables:5859 Node 0 DMA free:2160kB min:48kB low:60kB high:72kB active:0kB inactive:0kB present:10724kB pages_scanned:0 all_unreclaimable? yes lowmem_reserve[]: 0 739 739 739 Node 0 DMA32 free:3492kB min:3452kB low:4312kB high:5176kB active:313576kB inactive:314656kB present:757376kB pages_scanned:1226904 all_unreclaimable? yes lowmem_reserve[]: 0 0 0 0 Node 0 Normal free:0kB min:0kB low:0kB high:0kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no lowmem_reserve[]: 0 0 0 0 Node 0 HighMem free:0kB min:128kB low:128kB high:128kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no lowmem_reserve[]: 0 0 0 0 Node 0 DMA: 4*4kB 4*8kB 2*16kB 5*32kB 4*64kB 1*128kB 2*256kB 0*512kB 1*1024kB 0*2048kB 0*4096kB = 2160kB Node 0 DMA32: 19*4kB 11*8kB 0*16kB 0*32kB 8*64kB 2*128kB 0*256kB 1*512kB 0*1024kB 1*2048kB 0*4096kB = 3492kB Node 0 Normal: empty Node 0 HighMem: empty 45 pagecache pages Swap cache: add 8934620, delete 8934620, find 7869746/7929974, race 11+11 Free swap = 0kB Total swap = 4096564kB Free swap: 0kB 196064 pages of RAM 13511 reserved pages 4950 pages shared 0 pages swap cached

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DRBD very slow....
by Coert Waagmeester 30 Jul '09

30 Jul '09

Hello all, we have a new setup with xen on centos5.3 I run drbd from lvm volumes to mirror data between the two servers. both servers are 1U nec rack mounts with 8GB RAM, 2x mirrored 1TB seagate satas. The one is a dual core xeon, and the other a quad-core xeon. I have a gigabit crossover link between the two with an MTU of 9000 on each end. I currently have 6 drbds mirroring across that link. The highest speed I can get through that link with drbd is 11 MB/sec (megabytes) But if I copy a 1 gig file over that link I get 110 MB/sec. Why is DRBD so slow? I am not using drbd encryption because of the back to back link. Here is a part of my drbd config: # cat /etc/drbd.conf global { usage-count yes; } common { protocol C; syncer { rate 80M; } net { allow-two-primaries; } } resource xenotrs { device /dev/drbd6; disk /dev/vg0/xenotrs; meta-disk internal; on baldur.somedomain.local { address 10.99.99.1:7793; } on thor.somedomain.local { address 10.99.99.2:7793; } } Kind regards, Coert

6 23

rattle rattle
by donavan nelson 30 Jul '09

30 Jul '09

Can I rattle this cage open?

1 0

aautomatic updates
by Mike -- EMAIL IGNORED 30 Jul '09

30 Jul '09

Could someone please remind me what file controls automatic updates? Thanks, Mike.

2 2

Re: [CentOS] BIND vulnerability
by Stephen Harris 30 Jul '09

30 Jul '09

In-Reply-To=<4A70B20C.5020808(a)karan.org> Reply-To: (Apologies if this isn't in the thread properly; I'm trying to fake it from the website headers :-)) Karanbir Singh wrote: > http://lists.centos.org/pipermail/centos-devel/2009-July/004794.html > > I've updated 2 machines, and had no problems here. But some wider > testing would be good and we can get them into the main repos so more > people benefit. I just updated one machine; the process ended up with named not running. I did rpm -Uvh bind-utils-9.2.4-30.el4_8.4.i386.rpm bind-9.2.4-30.el4_8.4.i386.rpm bind-libs-9.2.4-30.el4_8.4.i386.rpm and got Jul 29 20:29:15 linode named: succeeded Jul 29 20:29:16 linode named[2873]: shutting down: flushing changes Jul 29 20:29:16 linode named[2873]: stopping command channel on 127.0.0.1#953 Jul 29 20:29:16 linode named[2873]: no longer listening on 127.0.0.1#53 Jul 29 20:29:16 linode named[2873]: no longer listening on 66.160.141.105#53 Jul 29 20:29:17 linode named[2873]: exiting Jul 29 20:29:18 linode named: failed After a restart it appeared to work... Jul 29 20:29:41 linode named[31609]: starting BIND 9.2.4 -u named Jul 29 20:29:41 linode named[31609]: using 4 CPUs Jul 29 20:29:41 linode named[31609]: loading configuration from '/etc/named.conf' etc... The daemon seems to be responding properly to requests after this manual start. -- rgds Stephen

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Re: [CentOS] USB, AutoMount & VNC
by Jason Thrasher 29 Jul '09

29 Jul '09

Hi Guy, I'm curious if you found a solution to the headless automount problem on centos? I'm running into a similar problem, though I am not using VNC. My machine is simply headless, with only network and power supplied, and I'm trying to trigger a bash script to run when a new device is added (like USB, DVD, CDROM, etc) using a custom udev rule. Automount seems to only work for removable devices if a user is logged in locally on the console, not via ssh. Something about the tty nature of the login seems to be affecting how udev handles these removable devices. When a user is logged in locally, it fires the udev rules, and will run my udev rule which triggers other actions. I can't get this to work without the local login though. any ideas or pointers? thanks, Jason

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Discuss July 2009