Discuss January 2008

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311 participants
383 discussions

NFS/NIS and firewalls
by Scott Ehrlich 11 Jan '08

11 Jan '08

I have a few C5 machines on an isolated LAN that connect to a RHEL5 server via NFS and NIS for authentication. I discovered that one of the C5 workstations worked fine for NFS exporting, but refused to collaborate with the EL5 server for NIS user authentication. I had successfully connected other systems to this server without issue, but this machine was finicky. I had initially enabled the EL5 firewall, then later disabled it, including selecting --disable-firewall. Still, this one C5 workstation wouldn't cooperate for user authentication. Then, as a bit of an experiment, I opted to visit the EL5 services and manually highlight IPtables, clicked STOP, and tried the verification again. This time, the C5 system got the NIS data. Now, if I want to enable a firewall on all machines - As a server, EL5 does have an option to select NFS services be run on specific ports. How do I configure the C5 clients to also communicate on those ports, thus allowing full NIS/NFS user authentication and directory exporting, all the while with built-in firewall protection on all systems? These are all out-of-box setups, with no updates, and full package installs from the install media. As time goes on, I will migrate to the OpenLDAP world, but I haven't had the opportunity to experiment with that just yet. Thanks. Scott

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OT -- Flash (.swf file) audio stream separation
by Robert 11 Jan '08

11 Jan '08

Does anyone here know of a utility that will filter a flash stream into its video and audio components? In order of preference -- 1)RPM 2)any open source tool 3)anything that does the job. Thanks for any clues.

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How to PXE Boot
by Oscar Usifer 11 Jan '08

11 Jan '08

Folks, Are there updated instructions on how to set up PXE boot under CentOS 5.x? I found that the system-config-netboot RPM has been absent, and the instructions written reference it, with a bug report not yet closed on Red Hat. Thanks, OSC http://www.centos.org/docs/5/html/Installation_Guide-en-US/s1-netboot-pxe-c… http://rhn.redhat.com/errata/RHBA-2006-0380.html -- Are we headed for a recession? Read more on the Money Portal Mail.com Money - http://www.mail.com/Money.aspx?cat=money

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Sun Fire X4200 M2 / CentOS 5 APIC issues
by Ryan Ordway 10 Jan '08

10 Jan '08

I had been running CentOS 5 happily on my Sun Fire X4200 M2 systems, then I upgraded the BIOS and iLOM firmware. Now I'm running into what seems to be a fairly common problem with newer motherboards. I cannot boot unless I use the 'noapic' kernel option. If I try to boot the kernel normally, I get the error: "MP-BIOS bug: 8254 timer not connected to IO-APIC" I can boot using noapic, but interrupts are *HORRIBLE* with noapic on the X4200 M2. Here is a system with the new BIOS running with noapic: [rordway@aphrodite ~]$ uname -a Linux aphrodite 2.6.18-53.1.4.el5.centos.plus #1 SMP Fri Dec 7 07:05:12 EST 2007 x86_64 x86_64 x86_64 GNU/Linux [rordway@aphrodite ~]$ cat /proc/interrupts CPU0 CPU1 CPU2 CPU3 0: 149047419 568805 215848 76392 XT-PIC timer 1: 0 2 0 0 XT-PIC i8042 2: 0 0 0 0 XT-PIC cascade 4: 399 80 58 26 XT-PIC serial 5: 138 19 4 4 XT-PIC ehci_hcd:usb2 7: 16203243 179851060 180334480 180522274 XT-PIC ioc0, eth1 8: 1 0 0 0 XT-PIC rtc 9: 0 0 0 0 XT-PIC acpi 11: 764 64 17 21 XT-PIC ohci_hcd:usb1 12: 2 2 0 0 XT-PIC i8042 14: 77 6 13 3 XT-PIC ide0 15: 15353489 192264 58884 10141 XT-PIC eth0 NMI: 0 0 0 0 LOC: 149884909 149891944 149889634 149890602 ERR: 377601098 MIS: 0 Compare this to an identical system running an identical kernel, but the older BIOS: [rordway@selene ~]$ uname -a Linux selene 2.6.18-53.1.4.el5.centos.plus #1 SMP Fri Dec 7 07:05:12 EST 2007 x86_64 x86_64 x86_64 GNU/Linux [rordway@selene ~]$ cat /proc/interrupts CPU0 CPU1 CPU2 CPU3 0: 415472769 0 0 0 IO-APIC-edge timer 1: 2 0 0 0 IO-APIC-edge i8042 4: 270 0 10 17 IO-APIC-edge serial 8: 1 0 0 0 IO-APIC-edge rtc 9: 0 0 0 0 IO-APIC-level acpi 12: 4 0 0 0 IO-APIC-edge i8042 14: 25 74 0 0 IO-APIC-edge ide0 58: 323 464 0 0 IO-APIC-level ohci_hcd:usb1 66: 26 0 0 0 IO-APIC-level ehci_hcd:usb2 74: 5940 981922 7254 524 IO-APIC-level ioc0 82: 2026 53828037 0 138601 IO-APIC-level eth0 90: 2237 61820570 0 689058 IO-APIC-level eth1 NMI: 0 0 0 0 LOC: 415433007 415433000 415432928 415432856 ERR: 0 MIS: 0 Note the huge ERR count with XT-APIC, and ioc0 and eth1 sharing an interrupt (SAS controller and my private network interface) Does anyone know if this has been fixed in the mainline kernel, and if so if this can be integrated into the CentOS 5.1 kernel (namely the CentOS Plus kernel)? Thanks! Ryan -- Ryan Ordway E-mail: rordway(a)oregonstate.edu Unix Systems Administrator rordway(a)library.oregonstate.edu OSU Libraries, Corvallis, OR 97331 Office: Valley Library #4657

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Samba's winbind and SELinux conflict
by Filipe Brandenburger 10 Jan '08

10 Jan '08

Hi, I was trying to setup winbind on a CentOS 4 host to authenticate to the AD on my network. My smb.conf is very simple, I'm only setting workgroup, realm, security, and I'm setting for winbind: encrypt passwords = yes winbind separator = + idmap uid = 10000-20000 idmap gid = 10000-20000 When trying to start the service with "service winbind start", I'm getting these error messages: Jan 10 16:18:00 myhost kernel: audit(1199999880.483:2): avc: denied { write } for pid=4490 comm="winbindd" name="secrets.tdb" dev=sda2 ino=192690 scontext=root:system_r:winbind_t tcontext=root:object_r:samba_etc_t tclass=file Jan 10 16:18:00 myhost winbindd[4490]: [2008/01/10 16:18:00, 0] passdb/secrets.c:secrets_init(67) Jan 10 16:18:00 myhost winbindd[4490]: Failed to open /etc/samba/secrets.tdb Jan 10 16:18:00 myhost winbindd[4490]: [2008/01/10 16:18:00, 0] nsswitch/winbindd.c:main(1010) Jan 10 16:18:00 myhost winbindd[4490]: Could not initialize domain trust account secrets. Giving up Clearly winbind is violating SELinux's targeted policy by trying to write the secrets.tdb file on /etc/samba directory. I looked at smb.conf's man page that I could set the directory of this file using the "private dir" directive on smb.conf's global section, and that's what I did, I set it to /var/cache/samba/winbindd_privileged, which I found was a directory created by the samba-common package, with 750 permissions and a winbind_var_run_t context. I would like to know if I did the right thing or not. Or if I should have put the secrets.tdb in a directory other than that one. What would be the recommended configuration? Thanks! Filipe

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Citadel pre-built packages?
by Filipe Brandenburger 10 Jan '08

10 Jan '08

Hi, Has someone created RPM packages of citadel for CentOS 4 or 5? I would be interested. If anyone has it in a public repository and would like to share, please tell me. I looked for it in CentOS base repositories and Rpmforge but didn't find anything. Anyway, please let me know. Thanks! Filipe

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Re: [CentOS] How to PXE Boot
by Oscar Usifer 10 Jan '08

10 Jan '08

This is the correct bug report I wanted to share, thanks. https://bugzilla.redhat.com/show_bug.cgi?id=236749 > ----- Original Message ----- > From: "Oscar Usifer" <oscaruser(a)programmer.net> > To: centos(a)centos.org > Subject: [CentOS] How to PXE Boot > Date: Thu, 10 Jan 2008 15:37:09 -0500 > > > Folks, > > Are there updated instructions on how to set up PXE boot under > CentOS 5.x? I found that the system-config-netboot RPM has been > absent, and the instructions written reference it, with a bug > report not yet closed on Red Hat. > > Thanks, > OSC > > http://www.centos.org/docs/5/html/Installation_Guide-en-US/s1-netboot-pxe-c… > http://rhn.redhat.com/errata/RHBA-2006-0380.html > > _______________________________________________ > CentOS mailing list > CentOS(a)centos.org > http://lists.centos.org/mailman/listinfo/centos -- Are we headed for a recession? Read more on the Money Portal Mail.com Money - http://www.mail.com/Money.aspx?cat=money

1 0

NFS problems with CentOS 4.5
by Mark Belanger 10 Jan '08

10 Jan '08

Our large and complex build system is having very sporadic failurs as we try to update to CentOS 4.5. This takes the form of files that exist - and have existed for some time - not being found: file.whatever: No such file: No such file or directory This happens both with source files, .o's - meaning that the errors come from both the compiler and linker. The build storage is on NFS and the errors don't happen when we target local disk. We also have solaris nad Centos 3.x building the same code base in a similar fashion with no problem. We are currently using mount options of: rw,nosuid,bg,timeo=50,retry=1 And have also tried: rw,intr,bg,proto=tcp,nfsvers=3,rsize=32768,wsize=32768 without success. Any suggestions welcome. -Mark

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Re: [CentOS] "find" switch to find files of a certain size?
by techlists＠comcast.net 10 Jan '08

10 Jan '08

I just answered my own question; ignore original post. -------------- Original message ---------------------- From: techlists(a)comcast.net > > Is there a switch in "find" (or some other command besides find) that'll let you > find files larger than a specified size? > > My file system is 88% full and I'd like to see where the biggest space hoggers > are. > > PG > _______________________________________________ > CentOS mailing list > CentOS(a)centos.org > http://lists.centos.org/mailman/listinfo/centos

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Re: [CentOS] "find" switch to find files of a certain size?
by Marko A. Jennings 10 Jan '08

10 Jan '08

On Thu, January 10, 2008 11:21 am, techlists(a)comcast.net wrote: > > Is there a switch in "find" (or some other command besides find) that'll > let you find files larger than a specified size? -size Read the man page.

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Discuss January 2008