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No USB 3.0 and audio sound with CentOS 5.6
by MOKRANI Rachid 27 Jun '11

27 Jun '11

Hi, I installed CentOS 5.6 on a Dell Precision Laptop M4600. This laptop has 2 USB 3 connectors. Nothing work (mouse or usb key...) when I connected something on this 2 ports. And sound not working on this laptop. [root@localhost ~]# lspci 00:00.0 Host bridge: Intel Corporation Sandy Bridge DRAM Controller (rev 09) 00:01.0 PCI bridge: Intel Corporation Sandy Bridge PCI Express Root Port (rev 09) 00:16.0 Communication controller: Intel Corporation Cougar Point HECI Controller #1 (rev 04) 00:16.3 Serial controller: Intel Corporation Cougar Point KT Controller (rev 04) 00:19.0 Ethernet controller: Intel Corporation 82579LM Gigabit Network Connection (rev 04) 00:1a.0 USB Controller: Intel Corporation Cougar Point USB Enhanced Host Controller #2 (rev 04) 00:1b.0 Audio device: Intel Corporation Cougar Point High Definition Audio Controller (rev 04) 00:1c.0 PCI bridge: Intel Corporation Cougar Point PCI Express Root Port 1 (rev b4) 00:1c.1 PCI bridge: Intel Corporation Cougar Point PCI Express Root Port 2 (rev b4) 00:1c.2 PCI bridge: Intel Corporation Cougar Point PCI Express Root Port 3 (rev b4) 00:1c.3 PCI bridge: Intel Corporation Cougar Point PCI Express Root Port 4 (rev b4) 00:1c.7 PCI bridge: Intel Corporation Cougar Point PCI Express Root Port 8 (rev b4) 00:1d.0 USB Controller: Intel Corporation Cougar Point USB Enhanced Host Controller #1 (rev 04) 00:1f.0 ISA bridge: Intel Corporation Cougar Point LPC Controller (rev 04) 00:1f.2 RAID bus controller: Intel Corporation Mobile 82801 SATA RAID Controller (rev 04) 00:1f.3 SMBus: Intel Corporation Cougar Point SMBus Controller (rev 04) 01:00.0 VGA compatible controller: nVidia Corporation Device 0dfa (rev a1) 01:00.1 Audio device: nVidia Corporation Device 0bea (rev a1) 03:00.0 Network controller: Intel Corporation Centrino Ultimate-N 6300 (rev 35) 0a:00.0 USB Controller: NEC Corporation uPD720200 USB 3.0 Host Controller (rev 04) 0b:00.0 FireWire (IEEE 1394): O2 Micro, Inc. Device 11f7 (rev 05) 0b:00.1 SD Host controller: O2 Micro, Inc. Device 8320 (rev 05) 0b:00.2 Mass storage controller: O2 Micro, Inc. Device 8330 (rev 05) [root@localhost ~]# Did someone know what to do for sound and for this 2 USB 3.0 connectors ? Regards. __________________________ Notre adresse de messagerie évolue pour plus de simplicité vers : prenom.nom(a)ifpen.fr. La racine @ifpenergiesnouvelles.fr reste néanmoins active. Our e-mail address is changing to firstname.surname(a)ifpen.fr. Nevertheless, messages sent to the domain @ifpenergiesnouvelles.fr will still be delivered. Ce message (et toutes ses pièces jointes éventuelles) est confidentiel et établi à l'intention exclusive de ses destinataires. Toute utilisation de ce message non conforme à sa destination, toute diffusion ou toute publication, totale ou partielle, est interdite, sauf autorisation expresse. IFP Energies nouvelles décline toute responsabilité au titre de ce message. This message and any attachments (the message) are confidential and intended solely for the addressees. Any unauthorised use or dissemination is prohibited. IFP Energies nouvelles should not be liable for this message. Visitez notre site Web / Visit our web site : www.ifpenergiesnouvelles.fr / www.ifpenergiesnouvelles.com __________________________

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Jumbo Frame performance or lackof?
by Emmanuel Noobadmin 27 Jun '11

27 Jun '11

After successfully getting higher MTU to work on my Realtek NICs, I started testing the impact of higher MTU on file transfers using NFS exported ramdisk to ramdisk. The results were unexpected. The higher the MTU on the sending NIC, the lower the file transfer speed. I tested by using time cp to copy a 1GB file (In case compression might affect the results, so I dd the test file from the CentOS DVD ISO) The average of 6 runs per MTU with varying MTU on the receiving NICs MTU 1500 = 116.34 MB/s MTU 3000 = 103.42 MB/s MTU 4000 = 102.52 MB/s I was actually planning to do 1500, 3000, 4500, 6000 and 7200. However, I was surprised to discover although I had two seemingly identical Realtek PCI-E nics, the sending NIC could only go up to 4K. I'm wondering, that since Jumbo Frames was supposed to be better for bulk transfers, why am I seeing these results? Is it the ElRepo drivers I used to enable higher MTUs or possibly some kind of oddity with the realtek NICs I am using? Or am I mistaken about the benefits of jumbo frames and that they are only beneficial in specific configurations, perhaps only with higher network speeds and enough packets at 1500 MTU to overwhelm packet handling hardware?

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Still having umask problems [resend]
by Todd Cary 27 Jun '11

27 Jun '11

I have the samba problems solved thanks to the help of folks on this forum, but I do not have the php umask problems solved. The www directory is /var/www/html and the html directory is owned by apache and is in the apache groups with the following permissions: drwxrwsr-- A sub-driectory, /var/www/html/viewpoints has the same attributes as the html directory, however when php creates a directory within /var/www/html/viewpoints, the permissions are drwxr-sr-x My goal is to have any created directories and files to have 774 permissions. What am I missing? Todd -- Ariste Software Petaluma, CA 94952 http://www.aristesoftware.com

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Does anyone using dm-cache?
by Rudi Ahlers 26 Jun '11

26 Jun '11

Hi, Has, or does, anyone use dm-cache - specifically for caching SAN based storage locally? I'm looking for a way to speed up SAN based storage on a CentOS 5.6 + XEN Hypervisor which uses iSCSI mounted SAN storage. dm-cache seems like it do the trick, but I've never heard of it before until someone mentioned it in another mailing list. A quick search on google didn't really give me much in terms of actual user experience. Does anyone use it? Any feedback? Pitfalls? Success stories? -- Kind Regards Rudi Ahlers SoftDux Website: http://www.SoftDux.com Technical Blog: http://Blog.SoftDux.com Office: 087 805 9573 Cell: 082 554 7532

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Still having umask problems
by Todd Cary 26 Jun '11

26 Jun '11

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sendmail - smtp security/authentication & port 587 issues
by Max Pyziur 26 Jun '11

26 Jun '11

Greetings, I'm refining a CentOs configuration installation, now just over one month old running on a colocated production server. Previously, we ran a version of Fedora for over seven years. Specifically, I'm reviewing our sendmail configuration, both with respect to authentication and port usage. Previously, we had the following line in the sendmail.mc line: define(`confAUTH_MECHANISMS', `DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl To authenticate, users would first have to POP their mail. A klunky script would scan appropriate log files and copy relevant IP addresses to the /etc/mail/access file that would be regenerated every 5 minutes via cron. Once the IP address was in the /etc/mail/access.db a user could be authenticated and be allowed to send email using the machine as smtp. Is there a better way of doing this? Port 587 issues: Verizon DSL filters out requests on port 25 to smtp servers not belonging to verizon.net. An alternative is to use port 587 for smtp purposes. Are there any views in this CentOs user community on this? Much thanks. Max Pyziur pyz(a)brama.com

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Jumbo frames problem with Realtek NICs?
by Emmanuel Noobadmin 26 Jun '11

26 Jun '11

I was trying to do some performance testing between using iSCSI on the host as a diskfile to a guest vs the VM guest using the iSCSI device directly. However, in the process of trying to establish a baseline performance figure, I started increasing the MTU settings on the PCI-express NICs with RTL8168B chips. First bottleneck was discovering the max MTU allowed on these is 7K instead of 9K but googling seems to indicate that the RTL8168B is only capable of 4K frames. I assumed 4K would still be better than nothing but unfortunately bumping up the MTU to anything else but 1.5K caused the file transfers (using NFS for easy testing), to hang at random points or more accurate slow to a crawl. Checking the syslog, I discovered warnings that increasing MTU with this adapter may cause problems. Searching around, it seems to be a common problem but there doesn't appear to be any clear cut fix, including some suggestions to use a third party driver. Does anybody know of a proven solution or is the Realtek chip itself irrevocably broken/bugged that anything above the default 1500 will simply not work?

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Strange issue's with LDAP and too many open files
by Sebastiaan Koetsier | proserve 26 Jun '11

26 Jun '11

Hi All, I've been growing a large headache on this one, i have a number of LDAP servers behind loadbalancing, since 2 days i constantly get the error: Too many open files. Although I'm not a newbie with linux I'm unable to resolve this, I have took the following stept: Changed the /proc/sys/fs/file-max to 65535 Added the following configuration to /etc/security/limits.conf: ldap soft nofile 65535 ldap hard nofile 65535 ldap - nofile 65535 # End of file If I su to the ldap user where the process is running under: [root@ldap5 ~]# su -m ldap bash: /root/.bashrc: Permission denied bash-3.2$ ulimit -H -n 65535 bash-3.2$ ulimit -S -n 65535 And still I get the error: Too many open files when open files are >1024. I'm bazzled. If anyone can provide me with some tips, please. Cheers, Sebastiaan.

3 5

Shared object packaging in rpm
by Joseph L. Casale 25 Jun '11

25 Jun '11

I whipped up a quick spec to package Zenoss' wmi client and noticed it creates a libasync_wmi_lib.so.0 and libasync_wmi_lib.so.0.0.1 that their python script would otherwise copy during its install routine (obviously I wrote a native rpm section for installation). Anyone know the naming convention associated with so's when they get compiled, what is the .0.1 extra file used for, they are slightly different. Thanks, jlc

3 4

Good Centos Security Advice & Gnome Thumbnails
by Always Learning 25 Jun '11

25 Jun '11

Browsing the net for one thing unexpectedly brought me to two good and useful documents: (1) Guide to the Secure Configuration of Red Hat Enterprise Linux 5 http://www.nsa.gov/ia/_files/os/redhat/rhel5-guide-i731.pdf Revision 4.1 February 28, 2011 (2) Hardening Red Hat Enterprise Linux 5 http://people.redhat.com/sgrubb/files/hardening-rhel5.pdf Updated 12 August 2010 Gnome Thumbnail system is mentioned in (1) as dangerous. As many Centos/Red Hat installations use it, here is a brief extract from page 30. 2.2.2.6 Disable All GNOME Thumbnailers if Possible The system’s default desktop environment, GNOME, uses a number of diﬀerent thumbnailer programs to generate thumbnails for any new or modiﬁed content in an opened folder. Execute the following command to prevent the thumbnailers from automatically creating thumbnails for new or modiﬁed folder contents: gconftool-2 --direct \ --config-source xml:readwrite:/etc/gconf/gconf.xml.mandatory \ --type bool \ --set /desktop/gnome/thumbnailers/disable_all true This eﬀectively prevents an attacker from gaining access to a system through a ﬂaw in GNOME’s Nautilus thumbnail creators. ------ I hate the thumbnailers, particularly as I have over 12,000 photographs on one machine and thousands more to be added. Eye of Gnome just ignores the 'thumbnail' off setting in Gnome. -- With best regards, Paul. England, EU.

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