Discuss November 2011

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208 participants
157 discussions

Pipes (fifos) not working in concurrently
by Timothy Madden 26 Nov '11

26 Nov '11

Hello I have a large list of URLs (from a database, generated automatically during tests) that I want to download using several wget processes at the same time. With our internal web servers, this will be a lot faster than downloading the pages one at a time with a single process. So I create 20 pipes in my script with `mkfifo´ and connect the read end of each one to a new wget process for that fifo. The write end of each pipe is then connected to my script, with shell commands like `exec 18>>fifo_file_name´ Then my script outputs, in a loop, one line with an URL to each of the pipes, in turn, and then starts over again with the first pipe until there are no more URLs from the database client. Much to my dismay I find that there is no concurrent / parallel download with the child `wget´ processes, and that for some strange reason only one wget process can download pages at a time, and after that process completes, another one can begin. My script does feed *all* the pipes with data, one line to each pipe in turn, and has all the pipes written and closed by the time the first child process has even finished downloading. Do you know why my child processes manifest this behavior of waiting in turn for each other in order to start reading the fifo and download ? I figure it must be something about the pipes, because if I use regular files instead (and reverse the order: first write the URLs, then start wget to read them) than the child processes run in parallel as expected. The child processes also run in parallel if I open the write end of the pipes first, and the start the wget processes for the read end. They even run in parallel with my pipes, but I could see them run like this only for once in all my attempts. I do not know what was special about that attempt, it happened at the beginning of the day, and the computers where not restarted nor logged off over night. The pipes are created and deleted on ever run, with mkfifo and rm. Is there something special about fifos to make them run in sequence if I open the read end first ? My script is attached here, I believe it is nicely formatted and clear enough. Thank you, Timothy Madden

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Add new host to /etc/libvirt/qemu/networks/default.xml without virsh net-destroy?
by Bent Terp 26 Nov '11

26 Nov '11

Hi, When I setup a new KVM guest and add it's mac address to the default NAT'ted network, it would be nice to have that become active without having to destroy the network and recreate it - as that tends to make the other guests rather upset. Anybody knows how to achieve that? I've tried virsh net-edit but that doesn't seem to do anything useful :-( BR Bent

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OT: ZFS appliance Oracle / Sun 7120
by Alan McKay 26 Nov '11

26 Nov '11

On Fri, Nov 25, 2011 at 8:11 PM, Fajar Priyanto <fajarpri(a)arinet.org> wrote: > Hi Alan, sorry for the OT. > I'm very much interested on the 7120. > How much space do you have on it and what is the price? I don't know the price - I've only been here a few weeks. I'll have to check when I'm back at work for details on it - don't have my VPN login yet. I'm going into work tomorrow to migrate another filesystem to the ZFS so I'll try to remember then. I am pretty happy with it so far - nice system with a relatively simple but powerful GUI. There is also a cryptic command line access level for managing it. -- “Don't eat anything you've ever seen advertised on TV” - Michael Pollan, author of "In Defense of Food"

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CentOS fileserver migrating to ZFS appliance
by Alan McKay 26 Nov '11

26 Nov '11

Hey folks, I've got a CentOS / RHEL (5.x) environment and am in the process of migrating the 5.3 file server over to an Oracle/Sun 7120 appliance. I want to keep my main 5.3 server as our NIS server but am moving NFS and Samba functions over to the appliance. NFS was a no brainer as one can imagine. Samba seems a bit trickier because of the authentication requirements in the ZFS server. They seem to want a domain controller which we don't have. Has anyone been here recently and can help with how to config the appliance for Samba but to authenticate from NIS ? thanks, -Alan -- “Don't eat anything you've ever seen advertised on TV” - Michael Pollan, author of "In Defense of Food"

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CentOS6 yum-plugin-fastestmirror spectacular failure
by Lars Hecking 26 Nov '11

26 Nov '11

I'm trying to update from the cr repo, but yum-plugin-fastestmirror gets it totally wrong; it selects a mirror in .hk that deliveres bytes per second, and as far as I can tell, most or all of the timedhosts.txt entries are in the Middle or Far East. What's going on? Nobody mirroring cr in other parts of the world? mirrors.ta139.com 99999999999 centos.communilink.net 99999999999 mirrors.hns.net.in 99999999999 centos.aol.in 99999999999 virror.hanoilug.org 99999999999 mirror.averse.net 99999999999 mirror.nus.edu.sg 99999999999 ftp.cuhk.edu.hk 99999999999 ftp.iitm.ac.in 99999999999 mirror-fpt-telecom.fpt.net 99999999999 centos.vr-zone.com 99999999999 mirrors.btte.net 99999999999 mirrors.digipower.vn 99999999999 centosmirror.go4hosting.in 99999999999 ftp.oss.eznetsols.org 0.220621109009 centos.01link.hk 99999999999 mirrors.ispros.com.bd 99999999999 mirrors.163.com 99999999999 mirror.vietoss.com 99999999999 mirror.neu.edu.cn 99999999999

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CentOS 6.1 QA status update.
by Lamar Owen 25 Nov '11

25 Nov '11

Posted, in case you haven't seen it already: http://qaweb.dev.centos.org/qa/node/116 Good news.

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How to get RHEL EUS source rpm.
by huyfuo 25 Nov '11

25 Nov '11

I want to get kernel-2.6.32-71.36.1.el6.src.rpm(RHBA-2011:1412-1). I have no RHEL subscriptions. There's no EUS srpms in ftp.redhat.com.

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Re: [CentOS] Forget SMB password immediately
by Eric Coleman 25 Nov '11

25 Nov '11

Dear Guitart, You have Microsoft Windows on your mind . . . Microsoft has left the building! ----- Original Message ----- From: Guitart Francesc Sent: 11/23/11 05:11 AM To: centos(a)centos.org Subject: [CentOS] Forget SMB password immediately Hi, I'm new to CentOS and also on the list, since I usually work with Debian. My problem is as follows: I have a NAS where users connect to do their backups. Each user has a folder shared where only he can enter. Multiple users get connected from a CentOS 5.7 to the NAS, each in its shared folder. I connect to the NAS by entering the login, password and shared folder of user A (here I connect through SMB port 445) and I get disconnected by removing the volume. I re-connect in the same way with the user B and then disconnect. Now if I connect with any user without entering the shared folder (I get a netbios connection to port 139) I can enter to the shared folder of user A and B without entering their credentials. A netstat -an shows me a connection to port 139 and 445 per user. After a while (too I think) connections over ports 445 and 139 are automatically cuted and I have to authenticate again. How I can force always the request of login and password? Thanks in advance. -- Francesc Guitart _______________________________________________ CentOS mailing list CentOS(a)centos.org http://lists.centos.org/mailman/listinfo/centos

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Applications on different deskops at startup
by Tony Molloy 25 Nov '11

25 Nov '11

Hi, I've just converted my laptop to Centos 6 from Fedora ( gnome 3 made the latest fedora unusable ) and I have one problem. I have several desktops with applications running on them, mainly terminals. At login all the terminals start on desktop 1. How do I get them to start on the desktop they were running on at logoff. That's how it worked on Fedora 13/14 so it must be popssible ;-) just can't find the magic. Thanks,, Tony

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Bacula dbcheck in CentOS6
by Tilman Schmidt 24 Nov '11

24 Nov '11

[Is it true that nobody replied to this in four months?] On Mon Jul 18 09:34:08 EDT 2011, Joseph L. Casale wrote: > Anyone else notice that /usr/libexec/bacula/make_catalog_backup.pl runs a "dbcheck -B" > which doesn't seem to exist in the version of dbcheck shipped with it? > > That makes it rather hard to do a catalogue backup with the shipped script? That's an error in the RPM install script. It uses the "alternatives" mechanism for switching between database backends but messes up. /usr/sbin/dbcheck ends up being linked to /usr/sbin/bscan.mysql instead of /usr/sbin/dbcheck.mysql. Consequently, when make_catalog_backup.pl tries to run dbcheck it's actually bscan which gets run. Not understanding the -B option is probably the least of its problems. :-) Until the RPM gets fixed, you can manually correct the bad symlink with: ln -sf /etc/alternatives/bacula-dbcheck /usr/sbin/dbcheck HTH T.

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Discuss November 2011