Discuss September 2014

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182 participants
169 discussions

"power outage"-save / like embedded systems
by Leon Fauster 01 Oct '14

01 Oct '14

I would like to setup a small system based on CentOS6 "power outage"-save as possible. The hardware will be switch off by pulling the plug. To accomplishing this goal, I would mounting some fs parts readonly (e.g. /usr) and thinking about tmpfs for volatile parts (e.g. lock, run under var). Additionally "optimize" some vm.dirty_* kernel- and fs/ext4 parameters. /persistent would be used with jffs2 on a CF card. So far the theory. Does anyone have some experience with such type of systems? Any pointer to pitfalls are welcome. -- Thanks LF

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CentOS 7 turn off power saving by command line
by Jerry Geis 01 Oct '14

01 Oct '14

In CentOS 6 gconftool-2 (command line) is used to enable/disable items. In CentOS 7 I found "settings->power-> blank screen" as something I wish to configure by the command line? How is that accomplished? I brought up gconf-editor and searched for power and blank and found nothing. How can I control this setting from the command line? Thanks Jerry

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Layer 2 VPN with OpenSSH on CentOS7 not working!
by Anthony K 01 Oct '14

01 Oct '14

Hi all. I'm trying to bring an Amazon VM into the LAN by following this guide [0]. However, it appears that OpenSSH on either RHEL7 or CentOS7 is broken as it is not creating tap interface but tun interface. I've tried this on both CentOS5 and CentOS6 and they both work as advertised! Downgrading the OS is not an option! CentOS5/6 gives me: ****************** tap1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 500 link/ether 9e:9e:44:9e:49:4c brd ff:ff:ff:ff:ff:ff CentOS7 gives me: **************** tun1: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT qlen 500 link/none So, what's broken in 7 - or is it that it requires something different? Cheers, ak. [0]: http://la11111.wordpress.com/2012/09/24/layer-2-vpns-using-ssh/

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gconftool-2 for 7
by Jerry Geis 01 Oct '14

01 Oct '14

on 6 the command: gconftool-2 -t bool --list-type bool --set /apps/gnome_settings_daemon/screensaver/start_screensaver false would stop the screen saver. What is it on 7. The above seems to do nothing. Also The gnome-panel process was running in 6 - it does not seem to be run in 7. How do I hide/remove the top and bottom panel? The "hide" in gconftool-2 for top and bottom done seem to do anything either. What might I be missing? Thanks, Jerry

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Is it safe to go from CentOS6.5 to CentOS 7 at this time
by Dan Hyatt 30 Sep '14

30 Sep '14

I am looking for opinions and personal experience on CentOS7 for both grid and virtualized web environments. I am currently on CentOS6.5 in a production environment. I am about to add about 50 more servers to my grid and am trying to identify the advantages and disadvantages of going to CentOS7. The good part is, that I have some tolerance for backing out and installing CentOS6.5 if 7 does not work out. I read the comments about what CentOS7 brings but want to make sure that I am not introducing undue risk. Not seen a lot of issues with it. I also have a small private cloud (VMWare esxi) and wanted to know if anyone was using CentOS7 there. The basic question: Should I be holding off a little longer on going to CentOS7 in production? Thanks Dan

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UPS question
by John R Pierce 30 Sep '14

30 Sep '14

so I have a bunch of servers at work that are on DUAL UPS's (1 per each of 2 power supplies). Its mostly HP gear, but also some Sun and IBM. Ideally I'd like the system to not go into shutdown unless BOTH UPS's that a particular box is plugged into (there's actually 4 UPS, 2 per each of 2 racks). Has anyone ever configured anything like that with NUT or whatever? Right now, I'm running without any UPS monitoring software, as the whole building is on a generator that comes on 60 seconds after a power failure, so my 7kVA(!) UPS's don't see much use, and also I just installled these new racks and UPS's and haven't really had the time to sit down and figure it all out. -- john r pierce 37N 122W somewhere on the middle of the left coast

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Have sound card, but no device?
by Gilbert Sebenste 30 Sep '14

30 Sep '14

Hello everyone, I'm stumped on trying to get my sound card to work on my new server. #dmesg |grep snd snd_hda_intel 0000:00:1b.0: enabling device (0000 -> 0002) snd_hda_intel 0000:00:1b.0: PCI INT A -> GSI 22 (level, low) -> IRQ 22 snd_hda_intel 0000:00:1b.0: irq 71 for MSI/MSI-X snd_hda_intel 0000:00:1b.0: setting latency timer to 64 snd_hda_intel 0000:01:00.1: enabling device (0000 -> 0002) snd_hda_intel 0000:01:00.1: PCI INT B -> GSI 36 (level, low) -> IRQ 36 snd_hda_intel 0000:01:00.1: setting latency timer to 64 I have an onboard Intel sound card, and I think I actually have two, looking in /proc/asound: card0 cards hwdep NVidia PCH seq version card1 devices modules oss pcm timers I am not getting any sound from either of them. I installed alsamixer to control the sound levels, but despite all having the volume up, I can't hear anything. However, that is not the problem; I only offer that to say this... I am trying to run an audio server using Icecast and Darkice, but no device can be found. In the past, it has shown up as a device: /dev/dsp1. Using a "default" option offers no help. It doesn't work. There is no "/dev/dsp1", like there is on my other machines. OK, so off to the configuration panel on Gnome I go. System->Preferences->Sound. And, it hangs with a "waiting for sound system to respond" message. I have Google-foo'd everything: no, I don't have Pulseaudio, as that messes up Icecast and Darkice. I have never had this issue before on any server. Does anyone have any ideas, or a webpage/wiki you could point me at that I might have missed? I want my /dev/dsp1 back. :-) Gilbert ******************************************************************************* Gilbert Sebenste ******** (My opinions only!) ****** *******************************************************************************

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Spacewalk? Local repo? Cache?
by Chris Beattie 30 Sep '14

30 Sep '14

I have a mix of CentOS 5, 6, and now 7 servers at work. There are enough of them now that it is starting to make sense for them to get updates from an internal source. I've seen RHN Satellite in years past. It looks like it may be a way to allow Windows admins here (familiar with WSUS) to update Linux boxes. A local repo might be easier to set up, but (as with Spacewalk) it seems like we'd end up with a lot of packages we don't need. A proxy and a sufficiently-large cache might do the trick if the first Linux box to get updates populates the cache which the files the others will need, but I haven't looked into this enough to see if there's even a way that works. How do you all keep a dozen or more Linux boxes updated? Thanks! -- Chris Nothing in this message is intended to make or accept an offer or to form a contract, except that an attachment that is an image of a contract bearing the signature of an officer of our company may be or become a contract. This message (including any attachments) is intended only for the use of the individual or entity to whom it is addressed. It may contain information that is non-public, proprietary, privileged, confidential, and exempt from disclosure under applicable law or may constitute as attorney work product. If you are not the intended recipient, we hereby notify you that any use, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this message in error, please notify us immediately by telephone and delete this message immediately. Thank you.

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Centos 6 Software RAID 10 Setup
by Matt 30 Sep '14

30 Sep '14

I am setting up a Centos 6.5 box to host some Openvz containers. I have a 120gb SSD I am going to use for boot, / and swap. Should allow for fast boots. Have a 4TB drive I am going to mount as /backup and use to move container backups too etc. The remaining four 3TB drives I am putting in a software RAID 10 array and mount as /vz and all the containers will go there. It will have by far the most activity. Does this layout look ok? RAID Devices md0 (/dev/md0) 5722917 /vz ext4 Hard Drives sda (/dev/sda) sda1 (/dev/sda1) sda1 500 /boot ext4 sda2 64000 swap sda3 49972 / ext4 sdb (/dev/sdb) sdb1 3815446 /backup ext4 sdc (/dev/sdc) sdc1 2861587 md0 software RAID sdd (/dev/sdc) sdd1 2861587 md0 software RAID sde (/dev/sdc) sdce 2861587 md0 software RAID sdf (/dev/sdc) sdf1 2861587 md0 software RAID

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yum update success+failure
by ken 30 Sep '14

30 Sep '14

Just doing "yum update" on two machines (and only two), both centos 5.10, one of them updated something like 22 packages, the other just 4. Packages which were updated on the first, but didn't get updated on the second machine include: gcc, httpd, kernel-2.6.18-398.el5, and probably a couple more. Trying the update on the second machine again (a few times), it always ends, "No Packages marked for Update". So now the first has: gcc-4.1.2-55.el5 httpd-2.2.3-91.el5.centos kernel-2.6.18-371.12.1.el5.centos.plus while the second has: gcc-4.1.2-54.el5 httpd-2.2.3-87.el5.centos kernel-2.6.18-371.11.1.el5 WTH???

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Discuss September 2014