Discuss December 2009

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295 participants
272 discussions

Small proxy appliance hardware
by Chuck Munro 02 Dec '09

02 Dec '09

I need to configure a small proxy appliance which doesn't require a lot of CPU power. I'm looking for any warnings this group may have regarding CentOS-5 on the following: - Acer AspireRevo 3610 (Atom CPU) - Dell Inspiron 537s (Celeron) - Any other small machines you might recommend (UL approved) I need to implement dual NICs, and for the Dell it should be no problem finding a low-profile 3Com or Intel adapter, but for the Acer I'll need to use one of those USB wired network dongle things. Does anyone have recommendations for a USB dongle that is fully automatic (regarding speed and duplex negotiation) supported by CentOS? Gigabit speed is not required. Any other compatibility issues with the above machines? Normally I'd simply build something from components and squeeze it into a small box, but in this case I need something with UL/CSA/CE approvals, which lets out homebrew hardware. Many thanks in advance!

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Errors in core dump apache
by Matias Sardisco 02 Dec '09

02 Dec '09

Hi. I saw that some instances of apache die in a segmentation fault. I found this errors in core dump of apache. #0 0x00002b180e623820 in crc32 () from /usr/lib64/libz.so.1 ------------------------- #0 0x00002b180e623820 in crc32 () from /usr/lib64/libz.so.1 ------------------------- #0 0x00002b180e623820 in crc32 () from /usr/lib64/libz.so.1 ------------------------- #0 0x00002b180e623820 in crc32 () from /usr/lib64/libz.so.1 ------------------------- #0 0x00002b180e623820 in crc32 () from /usr/lib64/libz.so.1 ------------------------- #0 0x00002b181603e3a9 in ?? () from /etc/httpd/modules/libphp5.so ------------------------- #0 0x00002b180e623820 in crc32 () from /usr/lib64/libz.so.1 ------------------------- #0 0x00002b180e623820 in crc32 () from /usr/lib64/libz.so.1 ------------------------- We run this software: CentOS 5.4 php 5.2.9 (test repository) httpd 2.2.3 zlib 1.2.3-3 Some ideas? Thank! ------------------------- Matias Sardisco e-mail: msardisco(a)mancia.org

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Tomcat authentication via PAM (or other system methods)?
by Les Mikesell 02 Dec '09

02 Dec '09

Is there a way to coax java services running under tomcat to use the system authentication methods set up through PAM? In my case, this would be users in the local passwd file or through smb to a windows domain. I've added mod_auth_pam to get this effect with apache but would like to also handle java web services. -- Les Mikesell lesmikesell(a)gmail.com

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(HOWTO) Crypto root with the LUKS key on a USB stick
by Devin Reade 02 Dec '09

02 Dec '09

I've written up a document on how to have whole-disk encryption (minus /boot) while having your LUKS key on a USB stick. (Whether or not this is a good idea depends on your usage model, and I won't get into that). The document is at <http://www.gno.org/~gdr/sysadmin/centos/5.4/usb-crypto-key.html> and is targetted at CentOS 5.4. It supersedes my howto for crypto root (for interactive boot or USB sticks) for CentOS 5.1 - 5.3 (the old links are on that page). If anyone has feedback on it, feel free to contact me privately. Devin -- Anyone who cannot cope with mathematics is not fully human. At best he is a tolerable subhuman who has learned to wear shoes, bathe, and not make messes in the house. - Robert Heinlein

1 0

Autofs cannot bind LDAP server
by Eric B. 02 Dec '09

02 Dec '09

Hi, I'm using Autofs and LDAP for mounting my home directories via nfs. In general, everything seems to work fine. However, I have one small problem. If I reboot my server using autofs while my LDAP server is down, I get the following error message in my logs: automount[3358]: bind_ldap_anonymous: lookup(ldap): Unable to bind to the LDAP server: (default), error Can't contact LDAP server which is understandable, since my ldap server is temporarily down. My problem, however, is that once my ldap server is back up, autofs never seems to retry to connect to it, so all my /home mounts fail. Basically, it means I have to make sure that my LDAP server is never down while another server is rebooting. I figure there must be something in the configuration file that would allow me to tweak this to indicate to autofs to recheck the ldap server periodically to see if it has come back up, but can't seem to find anything. My /etc/sysconfic/autofs file is pretty plain: # TIMEOUT - set the default mount timeout (default 600). # TIMEOUT=300 # LOGGING - set default log level "none", "verbose" or "debug" # LOGGING="verbose" # Other common LDAP nameing # MAP_OBJECT_CLASS="automountMap" ENTRY_OBJECT_CLASS="automount" MAP_ATTRIBUTE="ou" ENTRY_ATTRIBUTE="cn" VALUE_ATTRIBUTE="automountInformation" Is there anything I can do to force autofs to check to see if my LDAP server is back online? Thanks, Eric

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Samsung M800
by Frank Cox 02 Dec '09

02 Dec '09

I have a Samsung M800 phone that I had (wrongly) assumed would show up as a USB drive on Linux so I can transfer files to it and so on. Instead, it appears to present itself as a modem. Is there any way to make it appear as a usb drive? Dec 1 13:47:17 mutt kernel: usb 5-1: new full speed USB device using uhci_hcd and address 3 Dec 1 13:47:17 mutt kernel: usb 5-1: configuration #1 chosen from 1 choice Dec 1 13:47:18 mutt kernel: cdc_acm 5-1:1.0: ttyACM0: USB ACM device Dec 1 13:47:18 mutt kernel: usbcore: registered new driver cdc_acm Dec 1 13:47:18 mutt kernel: drivers/usb/class/cdc-acm.c: v0.25:USB Abstract Control Model driver for USB modems and ISDN adapters Dec 1 13:47:37 mutt kernel: usb 5-1: USB disconnect, address 3 Dec 1 13:47:38 mutt kernel: usb 5-1: new full speed USB device using uhci_hcd and address 4 Dec 1 13:47:38 mutt kernel: usb 5-1: configuration #1 chosen from 1 choice Dec 1 13:47:38 mutt kernel: scsi9 : SCSI emulation for USB Mass Storage devices Dec 1 13:47:43 mutt kernel: usb 5-1: USB disconnect, address 4 Dec 1 13:47:44 mutt kernel: usb 5-1: new full speed USB device using uhci_hcd and address 5 Dec 1 13:47:45 mutt kernel: usb 5-1: configuration #1 chosen from 1 choice Dec 1 13:47:45 mutt kernel: cdc_acm 5-1:1.0: ttyACM0: USB ACM device Dec 1 13:51:13 mutt kernel: usb 5-1: USB disconnect, address 5 nd address 6 Dec 1 13:51:16 mutt kernel: usb 5-1: configuration #1 chosen from 1 choice Dec 1 13:51:16 mutt kernel: cdc_acm 5-1:1.0: ttyACM0: USB ACM device -- MELVILLE THEATRE ~ Melville Sask ~ http://www.melvilletheatre.com

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Persistent NFS Caching
by Paul Berger 02 Dec '09

02 Dec '09

Has anybody got persistent NFS caching to work after 5.3 update removed the tech preview? I have cachesfilesd installed & running and using nfs-utils with fsc patched back in but it appears to not be working, any pointers? Regards, Paul Berger

3 4

non-threaded perl no longer in .spec file
by Kurt Hansen 02 Dec '09

02 Dec '09

Hello, I'm setting up a new server on 5.4 and noticed this in the perl.spec file: * Mon Jul 21 2008 Stepan Kasal - 4:5.8.8-14.el5 - add two patches, which... - Resolves: #435505, #431041 - remove %%define threading, the non-threading variant is not supported, Related: 435376 That comment wasn't there when I set up a server on 5.2 a few months back and the %define threading option was still in the perl.spec file, making it easy for me to create my own non-threaded perl. I want a non-threaded perl because the mod_perl folks say that the performance is better on a non-threaded perl. I believe I can compare the spec files and figure out where to edit the new spec file, but I wondered about that "not supported" comment. Is there something "bad" about the non-threading variant? Thanks! Take care, Kurt Hansen khansen(a)charityweb.net

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Inquiry:How to compare two files but not in line-by-line basis?
by hadi motamedi 02 Dec '09

02 Dec '09

Dear All Can you please do me favor and let me know how can I compare two files but not in line-by-line basis on my CentOS server ? I mean say row#1 in file1 has the same data as say row#5 in file2 , but the comm compares them in line-by-line basis that is not intended . It seems that the diff cannot do the job as well . Thank you in advance

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ldapsearch -f file doesn't work
by Sergio Belkin 02 Dec '09

02 Dec '09

Hi, Firstly, system info: Linux mysystem 2.6.18-53.1.4.el5 #1 SMP Fri Nov 30 00:45:55 EST 2007 x86_64 x86_64 x86_64 GNU/Linux I am running ldap on Centos with packages openldap-2.3.27-8.el5_2.4 y openldap-2.3.27-8.el5_2.4 I'd want to perform a query that return one attribute. So I did something as follows: ldapsearch -W -f qbis.ldif -D "cn=Manager,dc=palermo,dc=edu" -b "ou=people,dc=mydomain,dc=edu" -x legajo (Where legajo is the filter) There is no problem with filter but wih the file "qbis.ldif" which contains: dn: uid=jdoe,ou=people,dc=mydomain,dc=edu Of course I could perform that query with no need of one file, but I need to get "legajo" from around 800 users so it would be nice to be able to use "-f file". I cannot do something like a "loop for" because it would ask me every time the Manager password. Am I doing something wrong or is a ldap bug? Thanks in advance! -- -- Open Kairos http://www.openkairos.com Watch More TV http://sebelk.blogspot.com Sergio Belkin -

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Discuss December 2009