Discuss May 2011

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225 participants
153 discussions

Another system with no sound
by Alfred von Campe 09 May '11

09 May '11

I am also having an issue with no sound on some CentOS desktop systems. I manage about 3 dozen desktops. These are all Lenovo ThinkCentre systems of varying vintages, but there are only 2 distinct sound controllers among all of them: 00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 02) 00:1b.0 Audio device: Intel Corporation N10/ICH 7 Family High Definition Audio Controller (rev 01) On some systems, the sounds is working fine, and on others it's not. It's not a sound controller issue, as I've got sound working on multiple systems with each controller. I've checked the settings in alsamixer and the master is not muted. As far as I can tell, all systems are configured similarly (they were build via kickstart and maintained up-to-date with "yum update" periodically). Here is some info from a system on which sound is working: # lspci | egrep -i 'audio|sound|snd|alsa' 00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 02) # lsmod | egrep -i 'audio|sound|snd|alsa' snd_hda_intel 523949 0 snd_seq_dummy 7877 0 snd_seq_oss 32577 0 snd_seq_midi_event 11073 1 snd_seq_oss snd_seq 49585 5 snd_seq_dummy,snd_seq_oss,snd_seq_midi_event snd_seq_device 11725 3 snd_seq_dummy,snd_seq_oss,snd_seq snd_pcm_oss 42817 0 snd_mixer_oss 19009 1 snd_pcm_oss snd_pcm 72133 2 snd_hda_intel,snd_pcm_oss snd_timer 24516 2 snd_seq,snd_pcm snd_page_alloc 14281 2 snd_hda_intel,snd_pcm snd_hwdep 12869 1 snd_hda_intel snd 55877 9 snd_hda_intel,snd_seq_oss,snd_seq,snd_seq_device,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer,snd_hwdep soundcore 11553 1 snd And here is the same info from a system where sound is not working: # lspci | egrep -i 'audio|sound|snd|alsa' 00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 02) # lsmod | egrep -i 'audio|sound|snd|alsa' snd_hda_intel 523949 1 snd_seq_dummy 7877 0 snd_seq_oss 32577 0 snd_seq_midi_event 11073 1 snd_seq_oss snd_seq 49585 5 snd_seq_dummy,snd_seq_oss,snd_seq_midi_event snd_seq_device 11725 3 snd_seq_dummy,snd_seq_oss,snd_seq snd_pcm_oss 42817 0 snd_mixer_oss 19009 1 snd_pcm_oss snd_pcm 72133 2 snd_hda_intel,snd_pcm_oss snd_timer 24516 2 snd_seq,snd_pcm snd_page_alloc 14281 2 snd_hda_intel,snd_pcm snd_hwdep 12869 1 snd_hda_intel snd 55877 11 snd_hda_intel,snd_seq_oss,snd_seq,snd_seq_device,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer,snd_hwdep soundcore 11553 1 snd Similar, but not quite identical. The settings in alsamixer, however, are identical. Any ideas as to what I can try next? Thanks, Alfred

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Finding wich files a writen to
by Nicolas Ross 09 May '11

09 May '11

Hi ! I have a server (Centos 5) that is using a pair of SAS drives to store the data. (Mail server) They are on an adaptec raid controler with a battery backup and write back cache active. >From time to time, I have sever peak io to those data disks (> 400 to 500 iops, > 70 to 100 megs/sec). With iostat, I find that it's almost a write i/o problem. How can I find to which files the OS writes ? On OSX boxes, there is a utility called fs_usage that can reports any disk activity for a particular process or all processes. Is there any utility like this on Centos ? iotop can points me to wich process, but that doesn't points me to what files are the culprits...

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How to add a HD to a LVM
by Todd Cary 08 May '11

08 May '11

I have connected a HD that was a prior system drive (Centos 4.8) and I am not sure of the command line procedures to find out if it is recognized (I believe it is since it present in the GUI), delete all data on it and finally add it to the LVM. I would like to use it as a backup data drive. Todd -- Ariste Software Petaluma, CA 94952 http://www.aristesoftware.com

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SSH using Keys, no password and SFTP?
by Jason 08 May '11

08 May '11

HI All, I have setup (and it was so easy) using SSH with keys instead of password authentication. I want to turn password authentication off completely. What I dont understand is how SFTP would work them. I dont see any settings in my FTP clients to use SFTP without providing a password. If that is the case, that is fine since the FTP users have no real privileges except to their own web folders. That being said, is it possible to allow only Password authentication for a few users? and then require Key authorization for other users where password would not be accepted for them..perhaps, if they try to connect with password they get denied without being prompted for a password? -- Jason

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fail2ban problem on shutdown
by Timothy Murphy 08 May '11

08 May '11

Another post on fail2ban reminded me of a problem I had in Italy, when the ADSL connection kept dropping, and only came back on re-booting. (I solved the problem in the end by getting a Billion modem/router in place of the no-name one supplied by Telecom Italia.) It seems that if there was no internet connection, fail2ban hung for an inordinate length of time, possibly for ever, when shutting down. I found I had to stop it separately, before shutting down or re-booting. -- Timothy Murphy e-mail: gayleard /at/ eircom.net tel: +353-86-2336090, +353-1-2842366 s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland

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Re: [CentOS] Centos 6 Update?
by Hendrik 08 May '11

08 May '11

2011/4/4 Gilbert Sebenste <sebenste(a)weather.admin.niu.edu>: > Karanbir said on the Twitter account (and elsewhere) roughly 3 weeks after > CentOS 5.6 gets released, and that will be hopefully by tomorrow. He says > all but 30 packages are OK with CentOS 6, but 5.6 is their first > priority. If Karanbir says 3 weeks it takes 3 months. (as well as with CentOS 5.6) -- Hendrik

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fail2ban and secure permissions
by David Mehler 08 May '11

08 May '11

Hello, Has anyone got fail2ban working and blocking ssh spambot atempts? My ssh is logging with a facility of authpriv which syslogd sends to /var/log/secure. That file has 600 permissions owned and group of root. I want to make it where fail2ban can access the needed file, yet not make it insecure in the process. I was not wanting to change permissions last time I did that on a log file a cron daily report kept noting it. I'd appreciate any suggestions. Thanks. Dave.

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KVM migration and time
by Adam Wead 08 May '11

08 May '11

Hi all, I have two Cent5.6 systems running KVM in a clustered configuration with Cent5.6 guests. Ntpd is running on both hosts and all guests. When the guest is booted onto either of the hosts, time stays synced. When I do a live migration to the other host, the time on the guest starts going haywire, fast-forwarding into the future at a steady rate. After digging around, this may be related to: https://bugzilla.redhat.com/show_bug.cgi?id=513138 Can anyone tell me if there's a correct combination of guest kernel parameters and/or host settings that will fix this? Thanks in advance. ...adam

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Configuring ipv6 reboot persistence, CentOS 5.6
by David Mehler 07 May '11

07 May '11

Hello, I'm running a CentOS 5.6 server through linode. I am atempting to configure it for ipv6, previously this had been done though not by me on a ubuntu box so the hardware can take it. I've got an ipv6 tunnel through Hurricane Electric and at a shell prompt have done the following: ifconfig sit0 up ifconfig sit0 inet6 tunnel ::IPV4 Address ifconfig sit1 up ifconfig sit1 inet6 add IPV6 Address route -A inet6 add ::/0 dev sit1 Testing that with a ping6 works fine. I then want it to persist across reboots. So I added the following to /etc/sysconfig/network: NETWORKING_IPV6=yes IPV6_DEFAULTDEV=sit1 and I made /etc/sysconfig/network-scripts/ifcfg-sit1 DEVICE=sit1 BOOTPROTO=none ONBOOT=yes IPV6INIT=yes IPV6TUNNELIPV4=IPV4 Address IPV6ADDR=IPV6 Address Reboot the box, check sit1 and it has an ip address. Running that ping6 command says the network can't be reached. I have to take the interface down and rerun those above commands manually. I'd appreciate any suggestions. Thanks. Dave.

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centos friends?
by Dave Stevens 07 May '11

07 May '11

Hello All, I want to ask about CentOS and money. Please do not start some kind of shitstorm over this, it isn't productive. I have just been looking at archive.org to see when the paypal option went missing from the donate menu at centos.org. I can't pin it down, but it was there on October 16, 2010 and isn't now, so that's the information I have on that point. There was a great deal of argy-bargy on this list when the 5.6 update was slow arriving. I don't want to go there, I was happy to see it when it arrived, as I always am when there's an update. The impression I got was that the maintainers and packagers were working as hard as they could and were tetchy about being nagged, being unable to do more. Fair enough, but we need not adopt the status quo entirely. The donate menu on the web site has this to say, (and more) ... "The CentOS team would like to remind you that the primary means of substaining the development of CentOS is via contributions by CentOS users. CentOS is now, and will continue to be totally free; however, it takes money and resources to make CentOS available. If you are able, please consider donating to the CentOS Project. Donations of promo material, public mirrors and dedicated servers are all vital to our contined operations. Monetary CentOS is currently reviewing our cash donation program. In the mean time we are not accepting any financial donations. We do appreciate though, if you want to - for example - help out with promo material. See our Wiki page on donations for more up to date information." So referring as directed to the wiki page shows: "Resource and financial needs The CentOS Project is entirely based on the efforts of volunteers. We rely on contributions and donations from CentOS users as well, for: * Logistics related to promotion and infrastructure * Specific hardware needs * Bandwidth and connectivity * Promotion material at conferences and exhibitions * Organizing CentOS-related events " I don't see anything there about money except in the first line and I'm really curious why. Internally it is clear that if the team hasn't put in place some cash donation basis probably the capacity isn't there. But the current team need not go into areas where they have no time or (perhaps) expertise. There are lots of capable money folks in the free software world who can and do accept donations and deal with administrative infrastructure and channel support to projects. So the name apache-friends is suggestive. Without necessarily using that model I wonder why there isn't a CentOS Friends group or fund to which I and others can donate. I can't help but believe that if there were, say, a couple of paid staff with CentOS as the day job, things would not be so burdensome to the devs we have now and maybe we could build on that. For my part, I installed CentOS on some machines I administer for non-profit groups in Canada. The lack of licencing fees makes a big difference to them, non-profits groups are perpetuually long on brains and short on cash. But even so I think we could cough up, say, ten bucks a year per machine to put some payback into CentOS. Given general widespread goodwill this might be multiplied significantly. I have not seen this discussed on the list and would be happy to know if there is some reason it hasn't been attempted. Please let me repeat, this is meant as a constructive suggestion, there is no problem with the product, quite the reverse. Comments? Dave -- Let us think the unthinkable, let us do the undoable, let us prepare to grapple with the ineffable itself, and see if we may not eff it after all. Douglas Adams in one of the Hitchiker novels...

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Discuss May 2011