Discuss

discuss@lists.centos.org

34753 discussions

Hibernating a laptop with the power button (Thinkpax X31) under CentOS 5.4
by Robert Heller 29 Jan '10

29 Jan '10

I am having a weird problem trying to get hibernation to work when I press the power button on my Thinkpad X31 under CentOS 5.4. I've modified /etc/acpi/events/power.conf to contain: # ACPID config to power down machine if powerbutton is pressed, but only if # no gnome-power-manager is running event=button/power.* action=/bin/ps awwux | /bin/grep gnome-power-manager | /bin/grep -qv grep || /sbin/shutdown -h now And restarted acpid (sudo /sbin/service acpid restart). I don't run gnome, so there won't be a gnome-power-manager process running. When I press the power button nothing happens (acpid does log that it ran the above action). If I run the action line above in a shell (as root), the machine does hibernate just fine. What is going on here? -- Robert Heller -- 978-544-6933 Deepwoods Software -- Download the Model Railroad System http://www.deepsoft.com/ -- Binaries for Linux and MS-Windows heller(a)deepsoft.com -- http://www.deepsoft.com/ModelRailroadSystem/

1 0

Centos/Linux Disk Caching, might be OT in some ways
by Noob Centos Admin 29 Jan '10

29 Jan '10

I'm trying to optimize some database app running on a CentOS server and wanted to confirm some things about the disk/file caching mechanism. >From what I've read, Linux has a Virtual Filesystem layer that sits between the physical file system and everything else. So no matter what FS is used, applications are still addressing the VFS. Due to this, disk caching is done on an inode/block basis. I'm assuming that this is still the case in CentOS or am I badly mistaken? If that is correct, then here is my scenario and hypothesis. Assuming the server has xxx MB of free memory and the database consist of several tables more than xxx MB in size. So no table will fit entirely into memory. And assuming other processes do not interfere with the caching behaviour or available memory etc. Given the inode caching behaviour, if the DBMS only access a bunch of inodes that total less than xxx MB, is it therefore likely to be always using the cache, hence faster? My thought is that if this is the case, then I could likely speed up the application behaviour if I further split the tables into parts that are more frequently accessed, and parts that are unlikely touched. e.g. the table may currently have rows with 20 fields and total 1KB/row, but very often say only 5/20 fields are used in actual processing. Reading x rows from this table may access x inodes which would not fit into the cache/memory. However if now I break the table into two parts with those 5 fields into a smaller table, there would be a speed increase since the reading the same x rows from this table would only access 1/x inodes. Further more, these would more likely fit into the disk/memory cache for even faster access. Or would I simply be duplicating what the DBMS's index files would already be doing and therefore see no improvement?

8 43

Installing an SSL Cert
by ML 29 Jan '10

29 Jan '10

HI All, I am considering buying this: http://www.godaddy.com/Compare/gdcompare_ssl.aspx?isc=sslqgo003a Since I have a domain that will be collecting data and processing payments. Where can I find instructions on how to install the certificate? Do I have to run another domain or sub domain for the store? Or can I just run the whole domain on https? Thanks, -Jason

8 7

bind a web root sub-folder to /usr/share/xxyy
by Mr. X 28 Jan '10

28 Jan '10

This is OT, but what is the RH/Centos best practice for this scenario. I have a web root under control of user webmaster. In /etc/fstab ----------- snip ------ /var/www/dev /home/webmaster/www_dev none bind 0 0 --------- unsnip ------ ls -al /var/www/dev/ drwxr-xr-x 10 webmaster webmaster 4096 Jan 28 14:21 dev what I'd like to do is bind /usr/share/xxyy to /var/www/dev/xxyy under control ~webmaster. Is it as simple as /usr/share/xxyy /var/www/dev/xxyy none bind 0 0 do I have chown webmaster:webmaster /usr/share/xxyy ? -- Mark

1 0

Starting a java applet from the desktop
by James B. Byrne 28 Jan '10

28 Jan '10

CentOS-5.4 i86_64 I have a calculator applet on my desktop (superbcalc.jar). When I double click on it I get no response. If I right click and select open with java I get no response. If I open a terminal window and cd to Desktop and type java -jar superbcalc.jar then the applet opens. Does anyone have any idea why I am seeing this behaviour? There are no messages in the syslog file relating to this. -- *** 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 -- *** 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 -- *** 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

3 3

question on virtual desktops
by Jerry Geis 28 Jan '10

28 Jan '10

centos has the 4 virtual desktops by default. if I have a terminal window open in desktop 1 is there a command I can execute (type in) to switch to desktop 2? The mouse will not be attached at this point and I want to switch views using a command line. How do I do that? Thanks, Jerry

3 2

/usr/sbin/usermod -p doesn't update MAX_DAYS - workaround?
by Sean Carolan 28 Jan '10

28 Jan '10

I have a large group of Linux servers that I inherited from a previous administrator. Unfortunately there is no single sign-on configured so each server has it's own local accounts with local authentication. Normally I use ssh keys and a handy shell script to change passwords on all these machines with the usermod -p command. We are able to update the password on on one server and push the encrypted password out to all the others. If, however, we turn on password aging with "chage -M 90 username" then try to update passwords with usermod, the aging info for the account is not updated even though the password has been changed. Apparently this must be done manually for each and every server with the passwd command. This is not practical. In the long run we're going to try and get some kind of centralized authentication, but in the meantime does anyone have an idea for a workaround? Thanks Sean

2 2

Crash during yum update
by Kwan Lowe 28 Jan '10

28 Jan '10

Hello all: I was getting a reproducible crash during an update of a xen system. The problem went away after I set SELinux to permissive, but the fact that it crashed was alarming (first one on a non-dev system that I've had in over a year). I attempted the update earlier but it crashed at the same point after attempting to update selinux. After verifying hardware (all clean) I ran it again and crashed in the same location. Third time failed again in same location. I rebooted, changed selinux, then it completed after that. Unfortunately there are no dumps and I had to put the system back into operation. Didn't see anything in bugzilla either. Anyone else seen this? Here's the console output: Transaction Summary ================================================================================ Install 2 Package(s) Update 17 Package(s) Remove 2 Package(s) Total size: 56 M Is this ok [y/N]: y Downloading Packages: Running rpm_check_debug Running Transaction Test Finished Transaction Test Transaction Test Succeeded Running Transaction Updating : selinux-policy-targeted 1/38 general protection fault: 0000 [1] SMP last sysfs file: /hypervisor/uuid CPU 0 Modules linked in: autofs4 i2c_dev i2c_core hidp rfcomm l2cap bluetooth lockd sunrpc ip_conntrack_netbios_ns ipt_REJECT xt_state ip_conntrack nfnetlink iptable_filter ip_tables ip6t_REJECT xt_tcpudp ip6table_filter ip6_tables x_tables ipv6 xfrm_nalgo crypto_api dm_multipath scsi_dh scsi_mod parport_pc lp parport xennet pcspkr dm_raid45 dm_message dm_region_hash dm_mem_cache dm_snapshot dm_zero dm_mirror dm_log dm_mod xenblk ext3 jbd uhci_hcd ohci_hcd ehci_hcd Pid: 4269, comm: semodule Not tainted 2.6.18-164.10.1.el5xen #1 RIP: e030:[<ffffffff88037cb0>] [<ffffffff88037cb0>] :jbd:journal_grab_journal_head+0x25/0x44 RSP: e02b:ffff88001ee5fb50 EFLAGS: 00010202 RAX: 0000000000304027 RBX: ffff88001d78e370 RCX: 0000000000000035 RDX: fffd88001d7939d0 RSI: ffff88001d78e310 RDI: ffff88001d78e370 RBP: 0000000000000001 R08: ffffffff804f8e00 R09: ffff88003e513600 R10: ffff88001d793a30 R11: ffffffff8804fc33 R12: ffff88001d793a30 R13: ffff88003e513600 R14: ffff88000194d908 R15: 0000000000000001 FS: 00002b85be90abc0(0000) GS:ffffffff805ca000(0000) knlGS:0000000000000000 CS: e033 DS: 0000 ES: 0000 Process semodule (pid: 4269, threadinfo ffff88001ee5e000, task ffff880032883820) Stack: ffffffff88032257 0000000000000000 0000000000000000 ffff88001d78e3d0 00000c000194d8d0 ffff88001d78e2b0 ffff88000194d908 000000000000056e 0000000000000004 000000000000056e Call Trace: [<ffffffff88032257>] :jbd:journal_invalidatepage+0xdc/0x358 [<ffffffff8021d3dd>] truncate_complete_page+0x1b/0x5c [<ffffffff8022b98f>] truncate_inode_pages_range+0x9b/0x290 [<ffffffff802c555b>] vmtruncate+0x4e/0xc9 [<ffffffff8024335e>] inode_setattr+0x22/0x104 [<ffffffff88050b2f>] :ext3:ext3_setattr+0x1bd/0x228 [<ffffffff8022ceab>] notify_change+0x145/0x2f3 [<ffffffff802d17af>] do_truncate+0x5e/0x79 [<ffffffff80212f1a>] may_open+0x1d3/0x22f [<ffffffff8021b4ce>] open_namei+0x2c8/0x6ed [<ffffffff80227a14>] do_filp_open+0x1c/0x38 [<ffffffff8021a1b8>] do_sys_open+0x44/0xbe [<ffffffff802602f9>] tracesys+0xab/0xb6 Code: ff 42 08 8b 07 a9 00 00 20 00 75 0a 0f 0b 68 f5 97 03 88 c2 RIP [<ffffffff88037cb0>] :jbd:journal_grab_journal_head+0x25/0x44 RSP <ffff88001ee5fb50> <0>Kernel panic - not syncing: Fatal exception

1 0

Seamonkey (Mozilla) web browser for CentOS 5.4?
by Robert Heller 28 Jan '10

28 Jan '10

Does the Seamonkey (Mozilla) web browser exist for CentOS 5.4? It seems to be missing from the standard repository. -- Robert Heller -- 978-544-6933 Deepwoods Software -- Download the Model Railroad System http://www.deepsoft.com/ -- Binaries for Linux and MS-Windows heller(a)deepsoft.com -- http://www.deepsoft.com/ModelRailroadSystem/

4 4

Postfix 2.6.5 in CentOSplus?
by Dirk H. Schulz 27 Jan '10

27 Jan '10

Hi folks, according to several findings on the web I tried to find postfix-2.6.5 in centosplus adding this to my /etc/yum.repos.d/CentOS-Base.repo: [base] exclude=postfix [centosplus] includepkgs=postfix in the right places. But when I "yum remove" and "yum install" postfix then, it's "only" 2.3.3-2.1 with added mysql/pqsql support. Is there anything I am doing wrong? Or is there just no postfix 2.6.5 in centosplus? Dirk

5 13

Jump to page:

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

Discuss