Discuss January 2012

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222 participants
221 discussions

turning off udev for eth0
by James B. Byrne 05 Jan '12

05 Jan '12

I have set up a kvm host and configured a standard clone prototype for generating new guests. One persistent (pun intended) annoyance when cloning is the behaviour of udev with respect to the virtual network interface. The prototype is configured with just eth0 having a dedicated IP addr. When the prototype is cloned udev creates rules for both eth0 and eth1 in the clone. Because eth1 does not exist in the cloned guest one has to manually edit /etc/udev/rules.d/70-persistent-net.rules to get rid of the bogus entries and then restart the clone instance to have the changes take effect. All this does is return the new guest to the prototype eth0 configuration. Is there no way to alter udev's behaviour? Is udev even needed on a server system using virtual hardware? Altering the rules file not a big deal in itself but it adds needless busywork when setting up a new guest. -- *** 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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Corrupt mbr and disk directory map
by Billy Davis 05 Jan '12

05 Jan '12

We are running Centos 5.6. All was fine until yesterday. I attempted to tar a 14KB work file to a USB floppy (/dev/sdb) for transport to another server. Unfortunately, I keyed in 'tar cvf /dev/sda filename' instead of 'tar cvf /dev/sdb filename'. /dev/sda is our main (boot/root/apps) scsi hard drive. I realized my mistake, but it was too late. The system is still powered up and running, but I am sure that I have overlaid (and trashed) the mbr and the disk directory map. When I run the 'fdisk /dev/sda' command, the console displays: "Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel. Building a new DOS disklabel. Changes will remain in memory only, until you decide to write them. After that, of course, the previous content won't be recoverable." When I run grub and enter 'find /grub/stage1', the console displays "Error 15: File not found" I suspect that when I power the system down, it will not reboot. I can reinstall mbr and grub, but I don't have the original partition table start/end values. Since the system is still running, it seems that the partition table must still be available to it from somewhere. Is there any way to easily restore the partition table? The system is completely backed up and can be restored if necessary, but I prefer a quick and simple solution, if possible. Any ideas? Thanks

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selinux context for mm-handler?
by Paul Heinlein 05 Jan '12

05 Jan '12

I've got a Mailman installation running on CentOS 4 that I'd like to migrate to a CentOS 6 box. My big obstacle at present is getting Mailman's mm-handler Perl script to run as a Sendmail local mailer with SELinux enabled. I've tried changing mm-handler's selinux context type a few times, but nothing has resulted in success: context result ------------------- ----------------------------------------- etc_mail_t sendmail can't execute mm-handler mailman_mail_exec_t mm-handler can't load perl modules bin_t mm-handler can't read Mailman data sendmail_exec_t mm-handler can't read Mailman data I'm willing and able to whip up a local policy modification, but I thought I'd ask if there's a standard solution to this problem; my Google searches have so far proven ineffective at providing pointers to an answer. -- Paul Heinlein <> heinlein(a)madboa.com <> http://www.madboa.com/

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CentOS-announce Digest, Vol 83, Issue 2
by centos-announce-request＠centos.org 05 Jan '12

05 Jan '12

Send CentOS-announce mailing list submissions to centos-announce(a)centos.org To subscribe or unsubscribe via the World Wide Web, visit http://lists.centos.org/mailman/listinfo/centos-announce or, via email, send a message with subject or body 'help' to centos-announce-request(a)centos.org You can reach the person managing the list at centos-announce-owner(a)centos.org When replying, please edit your Subject line so it is more specific than "Re: Contents of CentOS-announce digest..." Today's Topics: 1. CEBA-2012:0002 CentOS 5 gnome-screensaver Update (Johnny Hughes) ---------------------------------------------------------------------- Message: 1 Date: Thu, 5 Jan 2012 14:28:46 +0000 From: Johnny Hughes <johnny(a)centos.org> Subject: [CentOS-announce] CEBA-2012:0002 CentOS 5 gnome-screensaver Update To: centos-announce(a)centos.org Message-ID: <20120105142846.GA21742(a)chakra.karan.org> Content-Type: text/plain; charset=us-ascii CentOS Errata and Bugfix Advisory 2012:0002 Upstream details at : https://rhn.redhat.com/errata/RHBA-2012-0002.html The following updated files have been uploaded and are currently syncing to the mirrors: ( sha256sum Filename ) i386: 3e54b38e91dd4095ec5552733306535d993a51b4678c2a1db5dbbec91b13256f gnome-screensaver-2.16.1-8.el5_7.4.i386.rpm x86_64: 83d89da2e6cb1e777858a981d9dc72244b068d86adb427832325242c063b88ee gnome-screensaver-2.16.1-8.el5_7.4.x86_64.rpm Source: d3efc85e6d01e35f04509fd7986e2433a391020e01f35805cac13b0243287b00 gnome-screensaver-2.16.1-8.el5_7.4.src.rpm -- Johnny Hughes CentOS Project { http://www.centos.org/ } irc: hughesjr, #centos(a)irc.freenode.net ------------------------------ _______________________________________________ CentOS-announce mailing list CentOS-announce(a)centos.org http://lists.centos.org/mailman/listinfo/centos-announce End of CentOS-announce Digest, Vol 83, Issue 2 **********************************************

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CentOS6 and tilde expansion
by isdtor 05 Jan '12

05 Jan '12

Set up NIS and autofs on this new CentOS6 box, but it seems tilde expansion no longer works in bash? [root@frodo ~]# cd ~john -bash: cd: ~john: No such file or directory [root@frodo ~]# cd /home/john [root@frodo john]# pwd /home/john [root@frodo john]# It still works in t/csh: [root@frodo ~]# /bin/csh [root@frodo ~]# cd ~john [root@frodo ~john]# pwd /home/john [root@frodo ~john]# I couldn't find anything in the bash man page that suggests this feature needs explicit configuration.

3 3

A simplistic parental-control setup
by Marko Vojinovic 05 Jan '12

05 Jan '12

I am looking at the simplest (implementation-wise) solution to the following problem (on CentOS 6.2): I have a list of web addresses (like http://www.example.com, https://1.2.3.4/, etc.) that should be "forbidden" to access from a particular host. On access attempt, the browser should be redirected to a local web page (file on the hard disk) with the explanation that those addresses are forbidden. The possible ways of disallowed access include: * typing www.example.com or http://1.2.3.4/ in the browser * typing www.example.com/anyfolder/somefile.html in the browser * clicking on www.example.com when listed as a link on some other web site (say, Google search results) * nothing else. The last point above assumes that the users will never try any other method of accessing the site. These user's knowledge about computers in general is known to be elementary, so I don't need protection against geniouses who can figure out some obscure way to circumvent the lockdown (and please don't tell me that this is an irrational assumption, I know it is...). If possible, all this should be on a "per user" basis, but if implementing it system-wide would be much simpler, I could live with it. :-) The point is that I need a simple, easy-to-implement, easy-to-configure and easy-to-maintain solution for this particular usecase. What I don't need is some over-engineered solution that covers my usecase along with a whole bunch of stuff I will never need, and takes two months to configure properly. It should also be F/OSS, preferably included in CentOS repos or elsewhere. Or alternatively I could go along with manually setting up a bogus httpd/dns/iptables configuration which would do all this, but I have a feeling that it would not be the easiest thing to maintain... I'd appreciate any suggestions. :-) Best, :-) Marko

3 3

dhcp lease-time
by Timothy Murphy 05 Jan '12

05 Jan '12

Why is the default lease-time set to only 10 minutes (600 seconds) in /etc/dhcp/dhcpd.conf (CentOS-6.2) as distributed? Why is not set to a much longer time? Is there any disadvantage in doing that? Or conversely, is a short lease-time safer in some way? -- Timothy Murphy e-mail: gayleard /at/ eircom.net tel: +353-86-2336090, +353-1-2842366 s-mail: School of Mathematics, Trinity College Dublin

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phpmyadmin issue
by Rajagopal Swaminathan 05 Jan '12

05 Jan '12

Greetings, I have installed phpmyadmin on a Centos 6.2 box. When I try to access it through http://localhost/phpmyadmin it is giving me a 403 forbidden error any clues? TIA. -- Regards, Rajagopal

5 11

Cannot use kickstart file to install CentOS 6.2 into a blank harddisk
by lee_yiu_chung＠yahoo.com 05 Jan '12

05 Jan '12

I am trying using a kickstart file to install CentOS 6.2 into a new virtual machine (the MBR sector of the harddisk is all zero), however I found that the installer cannot go through the harddisk partition. It failed after I chose "Use All Space" at harddisk partition option. The error message is: http://anony.ws/i/bMcTJ.png "You have not defined a root partition (/), which is required for installation of CentOS to continue. You have not created a/boot/efi partition (note: I am using BIOS, not (U)EFI) This can happen if there is not enough space on your harddrive(s) for installation." However, if I create a blank MBR partition table before before CentOS installation, then there is no problem. The same kickstart file works for CentOS 6.1 with blank harddisk. (with url parameter changed of course) Below is the kickstart file I used (between dash lines) ------- url --url="http://ftp.twaren.net/Linux/CentOS/6.2/os/i386/" interactive timezone Asia/Hong_Kong firstboot --enable ------- Steps to reproduce: 1. create a new virtual machine with blank harddisk image (or, a real blank harddisk) 2. boot the netinstall iso 3. at boot menu, press tab and append ks=<kickstart_file_location> and press enter to boot 4. go through the boot option as usual until harddisk partition options 5. Choose "Use All Space" at harddisk partition options 6. error occurs

3 5

fail2ban won't die
by Timothy Murphy 05 Jan '12

05 Jan '12

If I lose my broadband connection here (Italy), and try to re-boot the computer (CentOS-6.2), the shutdown hangs at fail2ban. Normally there is no problem re-booting; it only happens if the network has gone down. It may just be an extraordinarily long timeout. Has anyone experienced this? And is there anything one can do about it? -- Timothy Murphy e-mail: gayleard /at/ eircom.net tel: +353-86-2336090, +353-1-2842366 s-mail: School of Mathematics, Trinity College Dublin

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Discuss January 2012