Discuss October 2009

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338 participants
324 discussions

using CentOS as an iSCSI server?
by Rudi Ahlers 21 Oct '09

21 Oct '09

Has anyone succesfully setup, and used CentOS as an iSCSI server? I'm trying to setup a server with 4x500GB HDD's, setup in RAID 10 to act as an iSCSI server for a virtualization project, but I can't find a decent howto on how to setup an iSCSI server using CentOS. I would like to setup something like Openfiler, but we also need todo some other stuff that OpenFiler doesn't support, so I would prefer to export some of the HDD space (about 500GB) as iSCSI LUN's -- Kind Regards Rudi Ahlers CEO, SoftDux Hosting Web: http://www.SoftDux.com Office: 087 805 9573 Cell: 082 554 7532

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File Server using ISCSI attached storage - Hardware HBA ?
by Clint Dilks 21 Oct '09

21 Oct '09

Hi Everyone I am looking at setting up a File Server that uses ISCSI storage. It is the first time I have done this, so I am wanting to get peoples thoughts on whether for CentOS systems you should use Hardware based ISCSI HBA's? If so do I need to be careful about what HBA I use ? Currently I am looking at purchasing a Dell System using Broadcom ethernet cards/ ISCSI HBA. From google searching it seems QLogic HBA's are quite popular ? Any suggestions or experience you can offer appreciated. Have a nice day

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Recommendation for PCI-e SATA RAID 5 card?
by Neil Aggarwal 21 Oct '09

21 Oct '09

Hello: I am looking for a recommendation for a PCI-e RAID card for my server. The server has a PCI-e x16 low profile slot so the card has to be at most 6.6 inches long x 2.536 inches high. I would like to use RAID 5 with 3 drives so I have to have those capabilities. It has to be CentOS 5.4 compatible (Of course!). I took a look at the offerings from 3Ware, but their cards are too long. If you have a card you are happy with, I would appreciate a recommendation. Thanks, Neil -- Neil Aggarwal, (281)846-8957, www.JAMMConsulting.com Will your e-commerce site go offline if you have a DB server failure, fiber cut, flood, fire, or other disaster? If so, ask about our geographically redundant database system.

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CentOS-5.3 saslauth configuration issue
by James B. Byrne 21 Oct '09

21 Oct '09

I am trying to get cyrus-imapd and saslauthd running together so that I can get squirrelmail to work. I have accomplished this on several other servers and have relatively complete documentation on how to do this. What I am running into in this case has me baffled. If I start saslauthd as a service: # service saslauthd start And I try testsaslauthd -u cyrus -p test Then I see this: 0: NO "authentication failed" and in the syslog I see this:: saslauthd[5995]: do_auth : auth failure: [user=cyrus] [service=imap] [realm=] [mech=pam] [reason=PAM auth error] However, if I stop the system service: # service saslauthd stop and I run the saslauthd daemon from the tty with debug on: # saslauthd -a shadow -d -n 6 then when I try # testsaslauthd -u cyrus -p test I see 0: OK "Success." Anyone have a clue for me as to what is going on here? Regards, -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

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Re: [CentOS] sendmail question
by Jerry Geis 21 Oct '09

21 Oct '09

Brent L. Bates wrote: > It is not odd. You just refuse to listen to those trying to help. How > many times do they have to say `Check your DNS'? > > Check your /etc/nsswitch.conf and make sure it has a line like this: > > hosts: files dns > > `files' comes FIRST and `dns' LAST. > > The file /etc/resolv.conf should have a line starting with `domain' and > have your domain after it. You should have at least one `nameserver' line. > If you are running `named' on your local system then put `127.0.0.1'. You > can have up to 3 `nameserver' lines. > > Finally, your /etc/hosts file should have a line like this: > > 127.0.0.1 localhost loopback me > > You should also have lines that correspond with each and every IP address > the system is using. For example: > > 123.12.34.56 myhost.mydomain.com myhost > > List the Fully Qualified Domain Name (FQDN) FIRST and then the short > name. > > Use things like `ping' and `nslookup' to make sure DNS is working. If > these take forever, 2 minutes for example, your DNS isn't working and you need > to fix it. > > One last thing, your mail queue shouldn't be any shorter than 15 MINUTES. > If you are sending out the the Internet and it is much shorter, you will > probably end up on someones SPAM list. > > Brent, nsswitch.conf has in it the following: passwd: files shadow: files group: files #hosts: db files nisplus nis dns hosts: files dns I do not have any domain line in /etc/hosts just 2 nameservers. /etc/hosts has 127.0.0.1 localhost I do also have the line with the correct IP for the machine. IP address space full machine name short name also. Thanks, jerry

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'Extremely lazy' disk flush?
by Les Mikesell 21 Oct '09

21 Oct '09

Are there any good options to configure a filesystem so most activity takes place in the RAM buffer with the flush to physical media allowed to lag very far behind? OpenNMS does some data collection that keeps the disk very busy. I don't want to lose the history completely in a crash like you would with a ramdisk, but it wouldn't be a big problem if only the last 10-30 minutes would be dropped. -- Les Mikesell lesmikesell(a)gmail.com

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centos5.4 and extras
by Ryan Pugatch 21 Oct '09

21 Oct '09

Trying to install CentOS 5.4 with Xfce and I have enabled the extras repo, but Xfce doesn't show up when I customize the software selections. Is this because 5.4 hasn't hit all of the mirrors yet, or is Xfce not around for 5.4? Ryan

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Console priority
by Daniel Bird 21 Oct '09

21 Oct '09

Hi all, A while back I vaguely remember someone posting a link to documentation on how to prioritise console access (for want of a better expression). For the life of me I can't find it in the archives or via Google; Can anyone provide a URL? Basically, I have a remote server that thrashes (that's my theory at least) occasionally, resulting in the service (httpd/mysql) failing. When its in this state logging on to the console (serial + screen) responds with "login timeout". The only way back from this at the moment is a reboot.. If I can prioritize console access somehow and get on to the server I may find a clue as to what's causing it. Cheers Dan

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Rescan for new geometry without reboot?
by Amos Shapira 21 Oct '09

21 Oct '09

Hello, We just had our servers fitted with more disks. Most of the disks are growing existing RAID 1+0 channels, some are in new channels. Controllers and disks support live installation. I'd like to avoid a reboot just to let the system find that the disks are larger. All I can find so far suggests that its possible to rescan the disks, and even find the new geometry (e.g. http://linux.derkeiler.com/Mailing-Lists/Kernel/2004-12/1555.html) but nobody knows how to actually convince the system to let me use the extra space without a reboot. Does anyone know of a way to achieve this? Thanks, --Amos

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local centos repository upgrade from 5.3 to 5.4
by Paul Herbosch 21 Oct '09

21 Oct '09

Hi list, I run quite a few centos 5.3 servers and have a local yum repository which is working fine. Below a list of what I'm rsyncing at the moment + an extract from my / etc/yum.repos.d/CentOS-Base.repo file I copied the OS directory from the install media and ran createrepo on that dir. I would like to upgrade my servers to 5.4. I was wondering if I could simply replace the '5.3' part in the rsync source to '5.4' ? Or is there more to it? Thank you in advance, Kind regards, Paul Herbosch === What I'm currently rsyncing === rsync -avrt rsync://anorien.csc.warwick.ac.uk/CentOS/5.3/addons/i386 -- exclude=debug/ /var/www/html/centos/5/addons/ rsync -avrt rsync://anorien.csc.warwick.ac.uk/CentOS/5.3/centosplus/ i386 --exclude=debug/ /var/www/html/centos/5/centosplus/ rsync -avrt rsync://anorien.csc.warwick.ac.uk/CentOS/5.3/contrib/i386 --exclude=debug/ /var/www/html/centos/5/contrib/ rsync -avrt rsync://anorien.csc.warwick.ac.uk/CentOS/5.3/extras/i386 -- exclude=debug/ /var/www/html/centos/5/extras/ rsync -avrt rsync://anorien.csc.warwick.ac.uk/CentOS/5.3/updates/i386 --exclude=debug/ /var/www/html/centos/5/updates/ === Local /etc/yum.repos.d/CentOS-Base.repo file === [base] name=CentOS-$releasever - Base # mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch… baseurl=http://mylocalreposerver/centos/$releasever/os/$basearch/ gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5 #released updates [updates] name=CentOS-$releasever - Updates # mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch… baseurl=http://mylocalreposerver/centos/$releasever/updates/$basearch/ gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5 etc... -- Paul Herbosch Operations TBWA\ Worldwide IT Mobile: +32 477 36 81 92 www.mytbwa.com/Technology This e-mail is intended only for the named person or entity to which it is addressed and contains valuable business information that is privileged, confidential and/or otherwise protected from disclosure. If you received this e-mail in error, any review, use, dissemination, distribution or copying of this e-mail is strictly prohibited. Please notify us immediately of the error via e-mail to disclaimer(a)tbwaworld.com and please delete the e-mail from your system, retaining no copies in any media. We appreciate your cooperation.

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Discuss October 2009