Discuss August 2013

discuss@lists.centos.org

147 participants
144 discussions

Re: [CentOS] Motherboard and chipset compatibility
by Glenn Eychaner 12 Aug '13

12 Aug '13

> > Since the reqirements are (relatively) modest (except those two), I was > > hoping to squeeze something in. > > how about an ultrasmall form factor desktop, such as the Dell Optiplex > 7010 USFF ? those have dual displayport outputs (requires $7 optional > video output panel), and are 24x6.5x24cm I didn't even know that the Optiplex 7010 was CentOS compatible (though someone may have mentioned it in my previous thread); it is not on the RedHat Hardware List, not does Dell's web site go out of its way to mention it. Again, how does one find this kind of thing out? There has to be a better solution than 3 days of web searches, Emails to tech support, and forum posts. In addition, the USFF Optiplex seems to be limited to a Core i3 processor and a mere 2GB of memory, which while acceptable is not optimal (and worse than some other solutions I'm looking at). And for everyone suggesting KVMs, VMs, SSH, or other solutions...this is a telescope operations system, so none of those are really appropriate to the task, I'm afraid. I really want direct monitor/keyboard/mouse connections (and yes, I keep a hotspare warmed up at all times in case of a critical failure, and have had to use it on more than one occasion). And I'm sorry my postings don't seem to thread right in the archives. I subscribe to the Digest form orf the list and am compiling these replies using the web archives. Anyway, -G. -- Glenn Eychaner (geychaner(a)lco.cl) Telescope Systems Programmer, Las Campanas Observatory

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Dell R515 with PERC H700 - JBOD?
by Joseph Spenner 12 Aug '13

12 Aug '13

Hello, I'm curiuos if anyone knows if it's possible to set up a Dell R515 (which has PERC H700) to be JBOD. It seems the only options are RAID0 or RAID1. I read posts, where people say it can by done by making each disk its own RAID0. This works, but it wigs out when that disk is removed, and forgets a disk was ever there (unless I go back in the PERC and fix it). My plan is to have a system where I can remove and replace the drives regularly, while the system is on/running. I do this on a SuperMicro, but wanted to migrate this server to a Dell. I tried disabling the RAID in the BIOS, but then the installer never sees the disks. Any ideas would be great. Thanks! Regards, Joseph Spenner ______________________________________________________________________ If life gives you lemons, keep them-- because hey.. free lemons. "♥ Sticker" fixer: http://microflush.org/stuff/stickers/heartFix.html

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Re: [CentOS] Motherboard and chipset compatibility
by Glenn Eychaner 12 Aug '13

12 Aug '13

John R Pierce wrote: > On 8/12/2013 9:14 AM, Glenn Eychaner wrote: > > * 1U short-depth rackmount chassis OR Mini-ITX small-footprint chassis > > * Dual 1920x1200 monitor display > > those two requirements together are unusual. most rackmount 1U systems > are headless, except a basic VGA for initial configuration. > dual display is generally found on a desktop system. I agree. In this case, the floor is not the best environment for the equipment, the adjacent rack has only 1U of short-depth rack space available, and the desktop is already crowded with keyboards and monitors. Since the reqirements are (relatively) modest (except those two), I was hoping to squeeze something in. Looks like I'm out of luck, and buying another full tower to hold a motherboard, a disk drive, and one expansion card. Sigh. -G. -- Glenn Eychaner (geychaner(a)lco.cl) Telescope Systems Programmer, Las Campanas Observatory

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Re: [CentOS] Motherboard and chipset compatibility
by Glenn Eychaner 12 Aug '13

12 Aug '13

m.roth at 5-cent.us wrote: > Now, about what you're looking to build - you say that you want 1U, and > mention rackspace: in my experience, rackmounts are a *lot* larger than a > pizza box, so I'm a little confused at the requirements you're building > for. The rack is already full; I only get that 1U of space by removing a spare part to another location, and unfortunately, I have a depth limit due to the power distribution module on the rack rear. These computers are replacing tower PCs that sit on the floor under a desk in a rather hostile environment, so I'd like to move them to either the desktop or the adjacent rack, but have limited space in either location (1U of short-depth rack or about room for a miniITX box on the desk). -G. -- Glenn Eychaner (geychaner(a)lco.cl) Telescope Systems Programmer, Las Campanas Observatory

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bonding interface instable
by Leon Fauster 12 Aug '13

12 Aug '13

Hi all, i recently found that some frontend servers (Centos6) show: kernel: bonding: bond0: link status definitely up for interface eth2. kernel: bonding: bond0: link status definitely down for interface eth2, disabling it kernel: bonding: bond0: link status definitely up for interface eth2. On some days frequently and on others none. But there is no hw failure or similar. $ cat /sys/devices/virtual/net/bond0/bonding/{mode,arp_validate} active-backup 1 active 1 $ cat /etc/sysconfig/network-scripts/ifcfg-bond0 DEVICE=bond0 BOOTPROTO=static IPADDR=MYIP NETMASK=MYMASK NETWORK=MYNET BROADCAST=MYCAST ONBOOT=yes TYPE=Ethernet BONDING_OPTS="mode=1 arp_interval=500 arp_validate=1 arp_ip_target=GATEIP,GATE2IP primary=eth0" $ cat /proc/net/bonding/bond0 Ethernet Channel Bonding Driver: v3.6.0 (September 26, 2009) Bonding Mode: fault-tolerance (active-backup) Primary Slave: eth0 (primary_reselect always) Currently Active Slave: eth0 MII Status: up MII Polling Interval (ms): 0 Up Delay (ms): 0 Down Delay (ms): 0 ARP Polling Interval (ms): 500 ARP IP target/s (n.n.n.n form): GATEIP, GATE2IP Slave Interface: eth0 MII Status: up Speed: 1000 Mbps Duplex: full Link Failure Count: 31 Permanent HW addr: MACADDR Slave queue ID: 0 Slave Interface: eth2 MII Status: up Speed: 1000 Mbps Duplex: full Link Failure Count: 1 Permanent HW addr: MACADDR Slave queue ID: 0 Device module tg3: $ cat /sys/module/tg3/version 3.124 Any ideas or same experiences out there? Thanks LF

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compile paramaters
by Rita 11 Aug '13

11 Aug '13

hi, I am trying to find out what compile flags and environment variables were used when compiling the python package. Is there an easy way of figuring this out? perhaps a website which shows the RPM specs? -- --- Get your facts first, then you can distort them as you please.--

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Openssl vulnerability - SSL/ TLS Renegotion Handshakes
by Anumeha Prasad 11 Aug '13

11 Aug '13

Hi, I'm currently at CentOS 5.8. I'm using openssl version openssl-0.9.8e-22.el5. The following vulnerability was reported by a Nessus security scan: "SSL/ TLS Renegotion Handshakes MiTm Plaintext Data Injection" As per following link, Redhat has introduced openssl-0.9.8m which fixes this specific issue: https://access.redhat.com/site/articles/20490#Updates_adding_RFC_5746_suppo… I created rpm for openssl-0.9.8m using tarball and when I tried to install it, I got "libssl.so.6()(64bit) is needed by <rpm name>" errors which would be solved by installing openssl098e rpm. This rpm is a part of CentOS 6 and so I can't install it. Do we have openssl-0.9.8m or higher rpm available for CentOS 5? Or any other way I could resolve errors "libssl.so.6()(64bit) is needed by <rpm name>"? Or any suggestions on the mentioned "SSL/ TLS Renegotion Handshakes" vulnerability? Thanks, Anumeha

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Why libnetfilter_queue is missing from CentOS, but available in, Fedora?
by Robert Moskowitz 10 Aug '13

10 Aug '13

I am asking this on behalf of the HIPL developers; http://infrahip.hiit.fi/ https://launchpad.net/hipl They have been working on getting their code consistant to the new libnetfilter architecture. Finally have Fedora 18 and 19 available, but have hit a stumbling block with Centos 6. They tell me they are not finding libnetfilter_queue. Here is their message to me: On 08/08/2013 02:03 PM, Miika Komu wrote: > Hi Robert, > > a bug fix exists in the trunk, thanks to Juhani. Do you know why > libnetfilter_queue is not available for CentOS? Do you know any CentOS > maintainers? > > On 13/03/13 15:00, Robert Moskowitz wrote: >> Here you go! >> >> >> -------- Original Message -------- >> Subject: Re: libipq and Fedora 18 >> Date: Wed, 13 Mar 2013 06:45:13 -0600 >> From: Michal Jaegermann <michal(a)harddata.com> >> Reply-To: For testing and quality assurance of Fedora releases >> <test(a)lists.fedoraproject.org> >> To: For testing and quality assurance of Fedora releases >> <test(a)lists.fedoraproject.org> >> >> >> >> On Wed, Mar 13, 2013 at 08:07:14AM -0400, Robert Moskowitz wrote: >>> I am working with the HIPL project: http://infrahip.net/ and I am >>> the creator of the HIP protocol (see RFC 5201 and ID 5201-bis). >>> >>> On past Fedora releases, HIPL has relied on libipq, but the package >>> manager cannot find this in F18. >> That is what you can find, for example, in Wikipedia: "libipq is a >> development library for iptables userspace packet queuing. Libipq >> provides an API for communicating with ip_queue. >> >> Libipq has been deprecated in favour of the newer libnetfilter_queue in >> Linux kernel-2.6.14 onwards." >> >> See also >> http://www.netfilter.org/projects/libnetfilter_queue/index.html >> >> If you will try: >> >> yum provides '*/libnetfilter_queue.so*' >> >> then packages libnetfilter_queue-1.0.2-1.fc18 and >> libnetfilter_queue-devel-1.0.2-1.fc18 will show up. >> >> Michal >> -- >> test mailing list >> test(a)lists.fedoraproject.org >> To unsubscribe: >> https://admin.fedoraproject.org/mailman/listinfo/test >> >> >>

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Autofs - can you mount only certain home dirs?
by Les Mikesell 09 Aug '13

09 Aug '13

Does autofs take completed control of directories mentioned in auto.master? The examples with /home show that you can specify individual users instead of * and &, but even then it seems to take over the whole /home level so you can't see or add local subdirs. I have a small group of users/hosts where I would like to at least temporarily mix/match who is automounted or not. -- Les Mikesell lesmikesell(a)gmail.com

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What FileSystems for large stores and very very large stores?
by Eliezer Croitoru 09 Aug '13

09 Aug '13

I was learning about the different FS exists. I was working on systems that ReiserFS was the star but since there is no longer support from the creator there are other consolidations to be done. I want to ask about couple FS options. EXT4 which is amazing for one node but for more it's another story. I have heard about GFS2 and GlusterFS and read the docs and official materials from RH on them. In the RH docs it states the EXT4 limit files per directory is 65k and I had a directory which was pretty loaded with files and I am unsure exactly what was the size but I am almost sure it was larger the 65k files per directory. I was considering using GlusterFS for a very large storage system with NFS front. I am still unsure EXT4 should or shouldn't be able to handle more then 16TB since the linux kernel ext4 docs at: https://www.kernel.org/doc/Documentation/filesystems/ext4.txt in section 2.1 it states: * ability to use filesystems > 16TB (e2fsprogs support not available yet). so can I use it or not?? if there are no tools to handle this size then I cannot trust it. I want to create a storage with more then 16TB based on GlusterFS since it allows me to use 2-3 rings FS which will allow me to put the storage in a form of: 1 client -> HA NFS servers -> GlusterFS cluster. it seems to more that GlusterFS is a better choice then Swift since RH do provide support for it. Every response will be appreciated. Thanks, Eliezer

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Discuss August 2013