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34753 discussions

memory map
by Jerry Geis 18 Nov '10

18 Nov '10

Is there any way to tell what has been "mapped" into memory on linux (C5 x86_64)? I am trying to use the "pagein @pagein-impress" command from openoffice and it does not seem to make any difference in speed. Can I tell if the files have actually been mapped into memory? Maybe I am not doing something right. Thanks, Jerry

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centos 5.5 x86_64 live cd
by Johan Scheepers 18 Nov '10

18 Nov '10

good day, I am new to centos. Using a standalone laptop. Downloaded and burned the live cd. All seem ok except screen resolution only 800x600. Most importand I do not seem to find the install to hard disk option anywhere. Some distros I tried do have an option to install on the screen when you are happy about the OS. Googled but could not find the howto for the live cd install. Kindly please..Is the live CD installable. Thanks Regards Johan

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ssh prompting for password
by bluethundr 18 Nov '10

18 Nov '10

hello list I have a network mounted home directory shared between all hosts on my network: [bluethundr@LCENT03:~]#df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup00-LogVol00 140G 4.4G 128G 4% / /dev/sda1 99M 35M 60M 37% /boot tmpfs 1.6G 0 1.6G 0% /dev/shm nas.summitnjhome.com:/mnt/nas 903G 265G 566G 32% /mnt/nas nas2.summitnjhome.com:/mnt/store 1.4T 187G 1.1T 15% /mnt/store nas2.summitnjhome.com:/mnt/home 903G 47G 784G 6% /home none 1.6G 136K 1.6G 1% /var/lib/xenstored So therefore my RSA key should already be in my authorized_keys on any host. However logging into the virtual network, I always get prompted for a password. just for the heck of it, I scp'd the key over again to one of the virtual hosts: [bluethundr@LCENT03:~]#scp .ssh/id_rsa.pub virt1:~ bluethundr@virt1's password: id_rsa.pub 100% 381 0.4KB/s 00:00 ssh'd in: [bluethundr@LCENT03:~]#ssh virt1 bluethundr@virt1's password: Last login: Tue Nov 16 15:57:24 2010 from 192.168.1.46 Searched for the key on the host I just ssh'd into: [bluethundr@VIRTCENT01:~]#grep -f id_rsa.pub .ssh/authorized_keys ssh-rsa AAAAB3NzaC1yc2EAAAABI-FAKE-DATA-dgjIWxnyplIYKE5IQw9FY2+IVsYw== As you can see, it's already there.. I then checked the modes on authorized_keys: [bluethundr@VIRTCENT01:~]#ls -l .ssh/authorized_keys -rw------- 1 1001 1002 1597 Nov 15 12:02 .ssh/authorized_keys And checked that I was using the same shared network mounted home directory from the machine I just ssh'd in from: [bluethundr@VIRTCENT01:~]#df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup00-LogVol00 9.1G 1.8G 6.9G 21% / /dev/xvda1 99M 20M 75M 21% /boot tmpfs 129M 0 129M 0% /dev/shm nas.summitnjhome.com:/mnt/nas 903G 265G 566G 32% /mnt/nas nas2.summitnjhome.com:/mnt/store 1.4T 187G 1.1T 15% /mnt/store nas2.summitnjhome.com:/mnt/home 903G 47G 784G 6% /home [bluethundr@VIRTCENT01:~]# Considering that this key is internal network only and doesn't have a passphrase set (it does not traverse internet boundaries) why on earth am I being prompted for a password whenever I ssh into this machine? thanks! -- Here's my RSA Public key: gpg --keyserver pgp.mit.edu --recv-keys 5A4873A9 Share and enjoy!!

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SMS Gateway
by Jakub Jedelsky 18 Nov '10

18 Nov '10

Hi list-people! Is there anybody who has expiriences with sms gateway on Centos? Our customer has a Siemens modem (connected via serial port) and finds any tool for sending and receving sms. I found something like gammu and smstools but I'm not sure with it.. Have you any tips? Thanks a lot! JJ.

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something chmod'ing /dev/null
by Joe Pruett 18 Nov '10

18 Nov '10

it looks like one of the recent updates will sometimes chmod /dev/null to 600. out of 20 machines i've updated, 3 of them had the odd /dev/null perms afterwards. i haven't tried to identify what it doing it yet, but wanted to give a heads up to others that might start seeing weird behavior.

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upgrading Centos-Xen when version 6 comes along
by Dave Stevens 18 Nov '10

18 Nov '10

I am curious what is the best way to upgrade my dom0 and domUs to V.6 (currently 5) when it releases. Any experience or docs on this? Dave -- "It is no measure of health to be well adjusted to a profoundly sick society." Krishnamurti

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Recycle Bin disappeared (GNOME, CentOS 5.5, 32 bit)
by Lanny Marcus 18 Nov '10

18 Nov '10

Probably this is due to operator error, The Recycle Bin in GNOME disappeared, for this CentOS 5.5 (32 bit) Desktop PC. The box is fully updated. Is there a command I can use, or another procedure, to get the Recycle Bin in GNOME working again? The .trash folder is there. Incredibly rare that I use the KDE Desktop, but it is also installed on this box and the Trash folder (like the Recycle Bin on GNOME) is working perfectly, so this seems to be something I've done to GNOME. [lanny@dell1602 ~]$ uname -a Linux dell1602 2.6.18-194.17.4.el5 #1 SMP Mon Oct 25 15:51:07 EDT 2010 i686 i686 i386 GNU/Linux [lanny@dell1602 ~]$ TIA! Lanny http://www.magazines-magazine.com/

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Ipv6 addr with Vlan-Id - unable to ping neighbour
by Rohit Mediratta 18 Nov '10

18 Nov '10

Hi All, If I have a vlan-Id on an interface with an ipv6 address, then I am unable to ping a real router. The problem is that the Neighbour Solicitation originated from the Centos machine is missing the Vlan-Id in the packet. Therefore a real router will drop such a packet. I have tried this with Centos 4.7 and with Centos 5.5 with the same result. If I originate the first Neighbour Solicitation from the Router (which contains the Vlan-Id), then Linux learns the Mac address correctly and bidirectional ping works. This is a workaround that I am using at the moment, but I would like to avoid doing this all the time (especially when there is a timeout of the neighbour information). This problem does not exist for Ipv4 (i.e. ARP packets originated from Centos contain the Vlan-Id as expected). Here is my topology. Router--port1/1/1.1-------------------eth2---(eth2.1)--Centos 10.10.8.1/24 1.1.1.2 10.10.8.10 (3ffe::a0a:801/120) (3ffe::a0a:80a/120) port 1/1/1.21--------------------------eth2.21 (3ffe::a0f:801/120) (3ffe::a0f:80a/120) (KANRTB1):~ > cat /etc/*-release CentOS release 5.5 (Final) (KANRTB1):~ > cat /proc/version Linux version 2.6.18-194.el5 (mockbuild(a)builder16.centos.org) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-48)) #1 SMP Fri Apr 2 14:58:35 EDT 2010 (KANRTB1):~ > ip -6 addr show <SNIP> 687: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 500 inet6 3ffe::a0f:80a/128 scope global valid_lft forever preferred_lft forever inet6 3ffe::a0a:80a/120 scope global valid_lft forever preferred_lft forever inet6 fe80::2ff:7ff:fe00:2/64 scope link valid_lft forever preferred_lft forever <SNIP> 692: eth2.1@eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 inet6 3ffe::a0a:80a/120 scope global valid_lft forever preferred_lft forever inet6 fe80::2ff:7ff:fe00:2/64 scope link valid_lft forever preferred_lft forever 693: eth2.21@eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 inet6 3ffe::a0f:80a/120 scope global valid_lft forever preferred_lft forever inet6 fe80::2ff:7ff:fe00:2/64 scope link valid_lft forever preferred_lft forever <SNIP> KANRTB1):~ > ifconfig <SNIP> eth2 Link encap:Ethernet HWaddr 00:FF:07:00:00:02 inet addr:1.1.1.2 Bcast:1.1.1.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:29 errors:0 dropped:0 overruns:0 frame:0 TX packets:313 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:3330 (3.2 KiB) TX bytes:48442 (47.3 KiB) eth2.1 Link encap:Ethernet HWaddr 00:FF:07:00:00:02 inet addr:10.10.8.10 Bcast:10.10.8.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:29 errors:0 dropped:0 overruns:0 frame:0 TX packets:64 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:2924 (2.8 KiB) TX bytes:10071 (9.8 KiB) eth2.21 Link encap:Ethernet HWaddr 00:FF:07:00:00:02 inet addr:10.15.8.10 Bcast:10.15.8.10 Mask:255.255.255.255 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:34 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:6313 (6.1 KiB) <SNIP> Any help/easy fixes/pointers are much appreciated. thanks, Rohit

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MacBook Pro and CentOS-5
by James B. Byrne 18 Nov '10

18 Nov '10

After a long, and quite disheartening, series of hardware problems with my HP laptop I decided to try out a Mac (late 2009 Intel based 19.5 inch). In the months since January past I have discovered this to be no significant improvement and I have grown tired of the persistent wireless connectivity problems and am totally put off by the upgrade to OSX-10.6.4 which killed HD graphics using Open-Gl. Since July, trying to use HD on my Mac now blackens half the screen and then locks the system. I am contemplating wiping the system and installing CentOS-5.5 instead. Before my frustration leads me to run straight on into a wall, what can I expect to NOT work on the Macbook if I do this? I do need wireless, albeit I really cannot say that I have it now. I also dearly would like to get back HD graphics as well. Regards, -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

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How to stop automount
by Dick Roth 17 Nov '10

17 Nov '10

I just put a USB hard drive into service, but find that unless the drive is connected to my PC the machine won't boot and drops to a shell. Below is the line I added to fstab. I thought that the option "noauto" would prevent the machine from trying to mount the drive /dev/sdb /usbdrive ext3 user,noauto,rw 0 2 What am I doing wrong? Any advice is welcome. Dick -- Yes indeed...the Hokey Pokey *is* what its all about!

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