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Wireless Printing
by Joseph L. Casale 16 Sep '09

16 Sep '09

My home network doesn't have any wireless access points (to slow) and I was iSCSI booting my wkst for a while:) Now I need to setup a printer so I was going to get an HP Photosmart C4580. The HPLIP page shows no network support:( I _was_ going to use a USB wireless nic I have and setup an ad-hoc to print to this thing. Anyone know anything that might make this work? Thanks! jlc

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iptables
by CentOS List 16 Sep '09

16 Sep '09

Hi, I have an existing iptables as follows:- # Firewall configuration written by system-config-securitylevel # Manual customization of this file is not recommended. *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :RH-Firewall-1-INPUT - [0:0] -A INPUT -j RH-Firewall-1-INPUT -A FORWARD -j RH-Firewall-1-INPUT -A RH-Firewall-1-INPUT -i lo -j ACCEPT -A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT -A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 21 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 25 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 110 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 143 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 443 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 993 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 995 -j ACCEPT -A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited COMMIT How do add a redirect port 26 to 25. I had googled the net and notice that the syntax is different iptables -A INPUT -p tcp --dport 26 -j ACCEPT iptables -A PREROUTING -t nat -p tcp --dport 26 -j REDIRECT --to-port 25 regards LC

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mount toption: nodev
by Yungwei Chen 15 Sep '09

15 Sep '09

Hi, I am trying to secure my CentOS file systems by introducing "nodev" to devies defined in /etc/fstab. I learned that "nodev" prevents users from mounting unauthorized devices. However, I can still mount a cdrom to /tmp/cdrom with the following defined in /etc/fstab. Am I missing something? Thanks. LABEL=/tmp /tmp ext3 defaults,nodev 1 2

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Centos 5.3 Kernel panic with fuse and glusterfs.
by Tom O'Connor 15 Sep '09

15 Sep '09

Hi List, We currently have a very irritating problem with Centos 5.3 x86_64 running on a Dell Poweredge SC1435. The problem is this: We are experiencing frequent kernel panics while using glusterfs and Fuse. Across the cluster of servers, we are experiencing roughly 1 panic every 1-2 days. This wasn't a problem with earlier servers where we used Fedora 6. Here's a kernel panic screenshot: http://imagehost.gr/images/c5ad2d5jzgpgoq91v24y.png Here's some general info: Linux server6 2.6.18-128.1.10.el5 #1 SMP Thu May 7 10:35:59 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux Using: fuse-2.7.4-8_10.el5 fuse-kmdl-2.6.18-128.1.10.el5-2.7.4-8_10.el5 fuse-libs-2.7.4-8_10.el5 glusterfs-common-2.0.1-1.el5 glusterfs-client-2.0.1-1.el5 glusterfs-server-2.0.1-1.el5 I've straced glusterfs while it dies, and there's nothing seriously spurious, just it stops working as soon as the kernel locks up. A little background, Gluster is used to share some directories which are used by apache to serve files from. I've managed to replicate the live environment inside a virtual machine, and also to replicate the kernel panic by loading the virtual machine's apache with ApacheBench, at as few as 3 concurrent requests, the kernel locks up. However, i have been unable to reproduce this exact behavior on the live cluster, and have tried up to 10,000 concurrent requests which max out the network more than anything. I've tried latest versions of gluster and fuse from development snapshots and stable releases, I've tried patched versions of fuse released by Gluster. Nothing seems to improve this problem. If anyone has any ideas for further debugging, or other routes for support. I'm running out of ideas. Thanks in advance Tom O'Connor -- Tom O'Connor -------------------------- Assanka: Every possibility w: http://www.assanka.net/ t: 0870 085 2038 f: 0871 433 0919 e: tom.oconnor(a)assanka.net

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Install CentOS on Partition(!)-images as a Xen-guest
by Bernhard Gschaider 15 Sep '09

15 Sep '09

Hi! Some weeks ago the "Running Xen"-book was recommended to me on this list. A nice book, but it gave me crazy idea: One of the recommendations (which sounds very reasonable to me) was to have instead of a single file that serves as a disk-image to have to files: one of them (which is mounted to hda1) serves as a partition that holds the data, the other one (which mounts to hda2) is the swap partition. The text in the books (admittedly it's a bit vague there) lead me to the conclusion that to the Xen-machine they will look like two partitions of a single drive hda. The advantage should be that it is much easier to extend the data partition (Take the machine offline. Extend the image with dd. Extend the filesystem on the image) I created the two files as described in book. "Formatted" them with mkswap and mkfs.ext3 (as described in the book) and added them to the configuration file for the host. Now when I start the installation of the host machine right in the beginning I get a message "/dev/hda1 has a loop partition layout. To use this disk for the installation of CentOS it must be initialized". When I don't allow formatting I get caught in a loop ("Is a loop partition. Initialize?"), when I allow formatting I get a partition on each of the devices (hda11 and hda21) and I would be allowed to go on with the installation, but IMHO this would defeat the purpose of the exercise So my question: - is there some error in thinking on my side? - is this a situation that the installer can't deal with? (in other words: would it work if I copied a complete installation into the root partition-image and then booted that?) - or is there a reason that using partition images is not very popular (Googling around did not reveal anything useful) Bernhard

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Simple web server with Apache: web page permissions ?
by Niki Kovacs 15 Sep '09

15 Sep '09

Hi, I'm currently sinking my teeth into the fine "Definitive Guide to CentOS". Right now I'm reading the chapter about Apache. One thing puzzles me: no mention is made of web page permissions. Let's say I'm using Apache's default configuration for setting up the most simple no-frills web server, e. g. no virtual hosts, only a series of static HTML pages in /var/www/html. Q: what permissions should I define for these pages? I remember having setup some web servers on Debian, and the tradition was that everything under /var/www/html (as in this example) was to be owned by user www-data and group www-data. What's the "tradition" with RHEL/CentOS? Cheers, Niki

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No envelope information
by Luis campo 15 Sep '09

15 Sep '09

hi, have installed centos 4.7 We have installed qmail + simscan + vpopmail + SpamAssassin + clanAV and when we send a mail from a particular domain, the following error leaves us simscan: no envelope information, deferred exit and checking our log shows me the following 2009-09-14 18:18:06.929624500 16910 < Received: from mail pickup service by cp197.mysite4now.com with Microsoft SMTPSVC; 2009-09-14 18:18:06.929631500 16910 < Mon, 14 Sep 2009 15:14:25 -0700 2009-09-14 18:18:06.929635500 16910 < thread-index: Aco1iLhSamfTCiVGQWqn8JicKvfRZQ== 2009-09-14 18:18:06.929639500 16910 < Thread-Topic: Encuesta de clima laboral 2009-09-14 18:18:06.929642500 16910 < From: <gptw(a)gptwperu.com.pe> 2009-09-14 18:18:06.929646500 16910 < To: <jmarin@enlace+ 2009-09-14 18:18:06.929650500 16910 < aduanero.com.pe> 2009-09-14 18:18:06.929727500 16910 < Subject: Encuesta I wonder if this problem can be for Centos 4.7 or which would be the problem. Greetings Luis _________________________________________________________________ Connect to the next generation of MSN Messenger http://imagine-msn.com/messenger/launch80/default.aspx?locale=en-us&source=…

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Centos 5.4 'prerelease-access' - is there such a thing?
by Peter l Jakobi 15 Sep '09

15 Sep '09

Hi, excluding the Frankengrade from CENTOS5.3 to upstream RHEL5.4, is there are procedure / repository access / nightly builds / ... to what will be CENTOS 5.4? URLs? Howtos? Discussion threads or notes? I checked help, wiki and forums and google, but came up empty. Of course, this kind of use is depending on the way the new upstream RHEL sources are processed, so maybe there won't be a complete set of packages at all until maybe one or two weeks before the release. But again I got no lucky search hits for this kind of internals either. I'll gladly collect and summarize for a (hopefully easier locatable) wiki-page to be :). cu, Peter -- cu Peter l Jakobi lists(a)kefk.oa.shuttle.de

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SUMMARY : Repair Filesystem prompt , after inode has illegal blocks ; qla2xxx message on reboot
by McCulloch, Alan 15 Sep '09

15 Sep '09

hi All, thanks for the responses. After being dropped into the # Filesystem repair prompt, ( on account of "inode 27344909 has illegal blocks" ) following warm reboot (via "reboot") after finding (SAN ) filesystem in read-only mode yesterday morning (possibly because of HBA fault on SAN) , I ran fsck -r /data (Linux version 2.6.18-92.1.18.el5 , Red Hat 4.1.2-42 , ext3 filesystem) This took a couple of hours or so , prompting me for various changes all of which I accepted. This appeared to complete OK, but then the system would not boot, with the following error from the qla2xxx driver. . . qla2xxx 0000:05:0d.0: Mailbox command timeout occurred. Scheduling ISP abort. qla2xxx 0000:05:0d.0: Mailbox command timeout occurred. Scheduling ISP abort. . etc However after powering down the system and cold-booting, the system was able to boot up and mount the repaired filesystem without any obvious damage, but with abnormal not to mention scary looking boot messages and ongoing warnings from multipath. This morning (as I sort of expected) the filesystem had dropped back down to read-only mode, but meanwhile the source of our woes was identified, a fibre port on the SAN controller which was degraded but not completely failed, so that there had been no clean failover to the twin controller, and therefore a degraded virtual device was presented to the O/S, with consequence for the filesystem. After that port and controller was quarantined, this time around I did a cold power-off reboot of the server , and this time there was a more normal looking boot and the filesystem came up normally without any repair being requested. (My hypothesis is that in this situation - i.e. ext3 filesystem has put itself in read-only mode - a warm boot , via reboot, does not cleanly remount the filesystem and apply the journal quite like a cold power-off reboot does. I think it is likely that the lengthy session of me answering "yes" to fsck's interactive repair, the first time around, simply applied all of the fixes that would automatically have been done from the journal , had I cold-rebooted in the first place. However that is only a hunch. But I will be making sure to do cold power-off reboots in general, in future.) Another lesson is that a sophisticated system of twin SAN controllers with failover does not protect against a situation where a device is degrading rather than failing completely. Thanks again for the responses and sorry if my questions were a bit basic but I have been dropped in a little out of my depth with this system. Cheers AMcC ======================================================================= Attention: The information contained in this message and/or attachments from AgResearch Limited is intended only for the persons or entities to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipients is prohibited by AgResearch Limited. If you have received this message in error, please notify the sender immediately. =======================================================================

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"Point Releases" Question
by Jorge Fábregas 15 Sep '09

15 Sep '09

Hello everyone, Let say 5.4 goes out today; If I fully update (today) my 5.2 system...will it be equivalent to 5.4 (all RPM packages with same version/release number?)? Or is it possible for the new point release to include NEW packages that weren't on the base relase (in this case CentOS 5)? Thanks, Jorge

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