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Hard Drive Recovery
by Centos 15 Aug '07

15 Aug '07

Hello our external scsi drive is detached, so it is not showing up in fdisk -l however it shows up mounted in /etc/mtab is there any command that I can run to detect and re attach the hard drive again ? I don't want to reboot the computer. Thanks

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Where is perl-spamassassin for Centos 5?
by Robert Moskowitz 15 Aug '07

15 Aug '07

I am looking for it..... I need it (according to the docs) for Scalix 11. And their docs say it is included in SuSE, but it does not seem to be in Centos 5. And I think I had it for a Centos 4 system.

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Cent OS 5 server setup walkthrough
by Rohit Rai 15 Aug '07

15 Aug '07

I have just finished setting up and configuring a server running CentOS 5 with 2 Xen VMs. This article describes my journey through this, including the problems I faced and there solutions. It documents the installation of CentOS 5, from a single CD, adding software, configuring squid, NFS, Xen, etc and sharing yum cache and lot more! I request everyone to check this out and tell me what should I do to make this setup properly secured and robust. Comments requested!!! It will definitely help you if you are a newbie and want to set up a CentOS server. mytechrantings: Setting up a Cent OS 5 server<http://mytechrantings.blogspot.com/2007/08/centos-5-selinux-xen-squid-yum-c…> -- I am careful not to confuse excellence with perfection. Excellence, I can reach for; perfection is God's business. - Michael J. Fox

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chown and chgrp on 4.5 vs 5.0
by Jerry Geis 15 Aug '07

15 Aug '07

I just noticed that on centso 4.5 I have an executable with the +s (chmod +s myexe) doing a chmod root myexe and chown root myexe does NOT affect the +s setting. However, on centos 5 this is not the case. chmod +s myexe chown root myexe or chgrp root myexe will DROP the +s status. How can I get around this? I want to keep the owner, group, world settings. Thanks, Jerry

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nfs installation
by Mark Quitoriano 15 Aug '07

15 Aug '07

Im trying to install nfs on my server. i tried to do apt-get install nfs nfs-lock portmap. but portmap is the only one available. Is there a new name for nfs and nfs-lock nowadays?

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SFTP error (perhaps due not to using passive mode?)
by Rogelio Bastardo 15 Aug '07

15 Aug '07

I'm getting a weird error when I try to sFTP on a CentOS box (which I don't have root access). when I run: sftp -oPort=990 user(a)host.domain.com I get the following error, which I suspect is a result of not being in "passive mode" (which works when I use Filezilla on Windows) Connecting to host.domain.com ssh_exchange_identification: Connection closed by remote host Couldn't read packet: Connection reset by peer Any suggestions?

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ssh key with redundant targets?
by Les Mikesell 15 Aug '07

15 Aug '07

Is there a way to tell ssh that it is OK that the target of a command may be one of several machines, not necessarily the one it stuck in ~/.ssh/known_hosts last time around? This might be due to DNS round-robin or an HA failover. Setting StrictHostKeyChecking to no in /etc/ssh/ssh_config allows commands to complete but it still prints the warning which confuses people. -- Les Mikesell lesmikesell(a)gmail.com

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Re: [CentOS] Forcing ifcfg-eth0 to use the same nic in multi nic machine
by David Thompson 15 Aug '07

15 Aug '07

Lanny Marcus wrote: > >I agree with Doug and Johnny. My belief is that every NIC in the world >is supposed to have a unique MAC address. Although the OP has been using >these boards without problems, I suspect there is a defect on the >boards. I've been waiting for the "authoritative network admin" to speak up, but no one has. I believe that as long as the interfaces are connected to different networks, there is no problem having the same MAC address. Connecting two NICs with the same mac address to the same network would be a Bad Thing (tm), as network switches would be confused about where to send packets destined for the MAC address in question. Years ago, Sun workstations with multiple NICs would always have the same MAC address for all the NICs. That being said, it does seem less than helpful on a modern motherboard. I just wanted to point out that it _may_ be an intentional design issue (though I agree a bad one). Cheers, Dave Thompson UW-Madison

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Re: [CentOS] Forcing ifcfg-eth0 to use the same nic in multi nic machine
by Les Bell 15 Aug '07

15 Aug '07

Sorry - I missed the original post - but I can think of one scenario where two NICs have the same MAC address. However, it's extremely unusua.l. The IEEE has managed the allocation of addresses for Ethernet, but IBM has done the same for Token Ring. The two didn't talk, and so their allocated address ranges overlap. Consequently there are a number of pairs of Token Ring and Ethernet cards out there that have the same MAC address. Token Ring/Ethernet bridges have to do some bit-fiddling to map TR MAC's to Ethernet because of it. That's probably not what the OP was enquiring about - unless he's extremely unfortunate and still has to deal with TR. Best, --- Les Bell, RHCE, CISSP [http://www.lesbell.com.au] Tel: +61 2 9451 1144 FreeWorldDialup: 800909

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Re: [CentOS] Forcing ifcfg-eth0 to use the same nic in multi nic machine
by Lanny Marcus 15 Aug '07

15 Aug '07

On 13 August 2007, Johnny Hughes <johnny(a)centos.org> wrote: <snip> > How can 2 nics from different companies have the same mac address .... > I don't think that is possible. > each card needs a separate MAC address, at least the way I understand > networking. I agree with Doug and Johnny. My belief is that every NIC in the world is supposed to have a unique MAC address. Although the OP has been using these boards without problems, I suspect there is a defect on the boards.

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