Discuss April 2009

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Bzip2 Compress directories
by James Matthews 27 Apr '09

27 Apr '09

Hi, How do you get bzip2 to compress directories? Thanks James -- http://www.astorandblack.com

6 8

eth0 killed when adding virtual interface and multiple NICs are present
by Kai Schaetzl 26 Apr '09

26 Apr '09

I have a strange problem on one machine where eth0 gets killed when I add a virtual interface. It's got something to do with the NIC ordering or with the xen network script having a problem with multiple NICs and virtual interfaces. I could need some help/comments on this. Some history: I added a NIC (chip identifies as Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet) to a Dell R200 server. CentOS 5.3 with Xen 3.3.1 (gitco repo). eth0 and eth1 are the built-in NICs, this is then eth2 (or it should be). Works. Everything is fine until I add a virtual interface to eth0 and reboot. I can add eth0:1 at runtime just fine. But if I let it stay in network-scripts and boot the whole eth0 is killed (doesn't show up in ifconfig and doesn't work). A network restart brings it up as if nothing is wrong. I first thought it might have something to do with the fact that eth0 is actually a bridge on Xen > 3.2 and tried the same config on another machine and there it works. It's not the exact same xen version, not 64bit and it's got only 1 NIC. So there are differences, but it seems to rule out the bridge as a cause. I then checked the logs more thoroughly and found that CentOS changes the NIC initialization order at boot-time. Without the third NIC it's eth0=NIC1 and eth1=NIC2 (as shown on the chassis). But with the third NIC it's most often that one that goes first. Here's a typical excerpt from messages. tigon/tg3 is the driver for the internal NICs which normally were on eth0 and eth1. Apr 25 19:00:59 c4 kernel: eth0: RTL8168b/8111b at 0xffffc20000022000, 00:21:27:c9:d1:f5, XID 38000000 IRQ 16 Apr 25 19:00:59 c4 kernel: eth1: Tigon3 [partno(BCM95721) rev 4201 PHY (5750)] (PCI Express) 10/100/1000Base-T Ethernet 00:1e:c9:fe:fb:ab Apr 25 19:00:59 c4 kernel: eth1: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[1] WireSpeed[1] TSOcap[1] Apr 25 19:00:59 c4 kernel: eth1: dma_rwctrl[76180000] dma_mask[64-bit] Apr 25 19:00:59 c4 kernel: eth2: Tigon3 [partno(BCM95721) rev 4201 PHY (5750)] (PCI Express) 10/100/1000Base-T Ethernet 00:1e:c9:fe:fb:ac Apr 25 19:00:59 c4 kernel: eth2: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[1] WireSpeed[1] TSOcap[1] Apr 25 19:00:59 c4 kernel: eth2: dma_rwctrl[76180000] dma_mask[64-bit] Apr 25 19:00:59 c4 kernel: tg3: eth0: Link is up at 1000 Mbps, full duplex. Apr 25 19:00:59 c4 kernel: tg3: eth0: Flow control is on for TX and on for RX. Apr 25 19:00:59 c4 kernel: r8169: eth2: link up Apr 25 19:00:59 c4 kernel: r8169: eth2: link up Apr 25 19:01:01 c4 ntpd[2461]: Listening on interface eth2, 192.168.2.4#123 Enabled Apr 25 19:01:01 c4 ntpd[2461]: Listening on interface eth0, 192.168.1.24#123 Enabled Apr 25 19:01:01 c4 ntpd[2461]: Listening on interface eth1, 192.168.2.3#123 Enabled Apr 25 19:01:08 c4 uxmon: c4.net: started monitoring: lo eth2 eth0 eth1 Apr 25 19:01:18 c4 kernel: tg3: peth0: Link is up at 1000 Mbps, full duplex. Apr 25 19:01:18 c4 kernel: tg3: peth0: Flow control is on for TX and on for RX. Apr 25 19:01:18 c4 kernel: device peth0 entered promiscuous mode Apr 25 19:01:18 c4 kernel: type=1700 audit(1240678878.244:3): dev=peth0 prom=256 old_prom=0 auid=4294967295 ses=4294967295 Apr 25 19:01:18 c4 kernel: eth0: topology change detected, propagating Apr 25 19:01:18 c4 kernel: eth0: port 1(peth0) entering forwarding state Repeated booting sometimes gives me a different order, e.g. the two tigon come first, but this is rare. Well, it seems this wasn't a problem until I added a virtual interface to eth0. When the eth interfaces are brought up the system seems to reenumerate the eth numbering according to the HWADDR matches and thus eth0=NIC1 and so on. As soon as I add a virtual interface to eth0 this breaks and all of eth0 is killed. At least that's what I figure. So, the next obvious question is: How can I set a fixed order, so that NIC1 is always brought up first as eth0? I'm not sure if this would fix it, though. I have done too few reboots yet, but it seems that at least once I got the "correct" initialization order but eth0 got killed, anyway. So, it might not be the order but still something in the Xen script which happens only when multiple NICs are present and a virtual interface is added. Any thoughts so far? Kai -- Kai Schätzl, Berlin, Germany Get your web at Conactive Internet Services: http://www.conactive.com

4 8

Olivier Castien/Roncq/Infofrance/FRA/TZG est absent.
by Olivier_Castien＠zieglergroup.com 26 Apr '09

26 Apr '09

Je serai absent(e) à partir du 25/04/2009 de retour le 04/05/2009. Je répondrai à votre message dès mon retour. En cas d'urgence, vous pouvez contacter l'équipe technique d'infofrance.

3 2

Re: [CentOS] Reading the output of uptime
by Les Bell 26 Apr '09

26 Apr '09

James Matthews <nytrokiss(a)gmail.com> wrote: >> I am wondering how I would interpret the "load average: 0.00, 0.01, 0.00" within the uptime. << See man 3 getloadavg. Best, --- Les Bell [http://www.lesbell.com.au] Tel: +61 2 9451 1144

1 0

Reading the output of uptime
by James Matthews 26 Apr '09

26 Apr '09

Hi, I am wondering how I would interpret the "load average: 0.00, 0.01, 0.00" within the uptime. Thanks James http://www.astorandblack.com

1 0

Antivirus for CentOS? (yuck!)
by Amos Shapira 26 Apr '09

26 Apr '09

Hi All, Yes, I know, it's really really embarrassing to have to ask but I'm being pushed to the wall with PCI DSS Compliance procedure (http://en.wikipedia.org/wiki/PCI_DSS) and have to either justify why we don't need to install an anti-virus or find an anti-virus to run on our CentOS 5 servers. Whatever I do - it needs to be convincing enough to make the PCI compliance guy tick the box. So: 1. Has anyone here gone though such a procedure and got good arguments against the need for anti-virus? 2. Alternatively - what linux anti-virus (oh, the shame of typing this word combination :() do you use which doesn't affect our systems performance too much. The reviewed servers run both Internet-facing web applications and internal systems, mostly using proprietary protocol for internal communications. They are being administrated remotely via IPSec VPN (and possibly in the future also OpenVPN). Thanks, --Amos

24 44

repository for mod_security
by Bowie Bailey 25 Apr '09

25 Apr '09

I want to add mod_security to my Apache server running CentOS 5.3 and am trying to find a repository to get it from. I found it in EPEL, but they have version 2.1.7, which is over a year old according to what I found on the modsecurity.org website. Is there a repository which is keeping this up to date? Or should I just build it from source? -- Bowie

4 3

Problems eith yum (wrong releasever)
by Sam Piippo 25 Apr '09

25 Apr '09

After installing clean Centos 5.3 and updating with "yum update" yum starts to fail. I get the following error message YumRepo Error: All mirror URLs are not using ftp, http[s] or file. Eg. 7 is not a valid release or hasnt been released yet/ removing mirrorlist with no valid mirrors: //var/cache/yum/base/mirrorlist.txt It looks like the $releasever variable has value 7. Why does this happen and how do I fix this? Thanks, Sami

2 2

MP4
by centos＠911networks.com 25 Apr '09

25 Apr '09

Hi, How do get to view MP4 video streams? -- Thanks

1 0

Re: [CentOS] centos firewall?
by Mintairov Mihail 25 Apr '09

25 Apr '09

2 1

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Discuss April 2009