Re: [CentOS] kerberized-nfs - any experts out there?

On Wed, Mar 22, 2017 at 6:11 PM, John Jasen <jja...@realityfailure.org> wrote: > On 03/22/2017 03:26 PM, Matt Garman wrote: >> Is anyone on the list using kerberized-nfs on any kind of scale? > > Not for a good many years. > > Are you using v3 or v4 NFS? v4. I think

Re: [CentOS] kerberized-nfs - any experts out there?

On Wed, Mar 22, 2017 at 3:19 PM, <m.r...@5-cent.us> wrote: > Matt Garman wrote: >> (2) Permission denied issues. I have user Kerberos tickets >> configured for 70 days. But there is clearly some kind of >> undocumented kernel caching going on. Looking at

[CentOS] kerberized-nfs - any experts out there?

Is anyone on the list using kerberized-nfs on any kind of scale? I've been fighting with this for years. In general, when we have issues with this system, they are random and/or not repeatable. I've had very little luck with community support. I hope I don't offend by saying that! Rather, my

Re: [CentOS] Spotty internet connection

On Fri, Feb 3, 2017 at 12:08 PM, John R Pierce wrote: > for Comcast/Xfinity, I'm using a Arris SB6183 that I got at Costco. this > is a simple modem/bridge, so /my/ router behind it gets the public IP. Note that some residential ISPs may not offer "naked" Internet, and/or

Re: [CentOS] Spotty internet connection

On Thu, Feb 2, 2017 at 7:13 PM, TE Dukes wrote: > Lately I have been getting slow and partial page loads, server not found, > server timed out, etc.. Get knocked off ssh when accessing my home server > from work, etc. Its not the work connection because I don't have

Re: [CentOS] NFS help

On Thu, Oct 27, 2016 at 12:03 AM, Larry Martell wrote: > This site is locked down like no other I have ever seen. You cannot > bring anything into the site - no computers, no media, no phone. You > ... > This is my client's client, and even if I could circumvent their >

Re: [CentOS] NFS help

On Tue, Oct 25, 2016 at 7:22 PM, Larry Martell wrote: > Again, no machine on the internal network that my 2 CentOS hosts are > on are connected to the internet. I have no way to download anything., > There is an onerous and protracted process to get files into the >

Re: [CentOS] NFS help

On Mon, Oct 24, 2016 at 6:09 PM, Larry Martell wrote: > The machines are on a local network. I access them with putty from a > windows machine, but I have to be at the site to do that. So that means when you are offsite there is no way to access either machine? Does

Re: [CentOS] NFS help

Another alternative idea: you probably won't be comfortable with this, but check out systemd-nspawn. There are lots of examples online, and even I wrote about how I use it: http://raw-sewage.net/articles/fedora-under-centos/ This is unfortunately another "sysadmin" solution to your problem.

Re: [CentOS] NFS help

On Mon, Oct 24, 2016 at 2:42 PM, Larry Martell wrote: >> At any rate, what I was looking at was seeing if there was any way to >> simplify this process, and cut NFS out of the picture. If you need >> only to push these files around, what about rsync? > > It's not just

Re: [CentOS] NFS help

On Sun, Oct 23, 2016 at 8:02 AM, Larry Martell wrote: >> To be clear: the python script is moving files on the same NFS file >> system? E.g., something like >> >> mv /mnt/nfs-server/dir1/file /mnt/nfs-server/dir2/file >> >> where /mnt/nfs-server is the mount point of

Re: [CentOS] NFS help

On Fri, Oct 21, 2016 at 4:14 AM, Larry Martell wrote: > We have 1 system ruining Centos7 that is the NFS server. There are 50 > external machines that FTP files to this server fairly continuously. > > We have another system running Centos6 that mounts the partition the

[CentOS] Kerberized NFS client and slow user write performance

We seem to be increasingly hit by this bug: https://access.redhat.com/solutions/2040223 "On RHEL 6 NFS client usring kerberos (krb5), one user experiences slow write performance, another does not" You need a RH subscription to see that in its entirety. But the subject basically says it all:

Re: [CentOS] Suggestions for Config Management Tool

As others have said, in the end, it's a matter of personal preference (e.g. vim or emacs). You could spend a week reading articles and forum discussions comparing all the different tools; but until you've really used them, it will mostly be an academic exercise. Of course, the particulars of

[CentOS] tune2fs: Filesystem has unsupported feature(s) while trying to open

I have an ext4 filesystem for which I'm trying to use "tune2fs -l". Here is the listing of the filesystem from the "mount" command: # mount | grep share /dev/mapper/VolGroup_Share-LogVol_Share on /share type ext4

Re: [CentOS] Just need to vent

I haven't used gnome3, or any Linux desktop in earnest for a long time... But I used to be semi-obsessed with tweaking and configuring various Linux desktops. And back when I was doing that, there were dozens of desktop programs available, from super lightweight bare bones window managers, to full

Re: [CentOS] HDD badblocks

That's strange, I expected the SMART test to show some issues. Personally, I'm still not confident in that drive. Can you check cabling? Another possibility is that there is a cable that has vibrated into a marginal state. Probably a long shot, but if it's easy to get physical access to the

Re: [CentOS] HDD badblocks

Have you ran a "long" smart test on the drive? Smartctl -t long device I'm not sure what's going on with your drive. But if it were mine, I'd want to replace it. If there are issues, that long smart check ought to turn up something, and in my experience, that's enough for a manufacturer to do a

Re: [CentOS] Intel SSD

I always tell vendors I'm using RHEL, even though we're using CentOS. If you say CentOS, some vendors immediately throw up their hands and say "unsupported" and then won't even give you the time of day. A couple tricks for fooling tools into thinking they are on an actual RHEL system: 1. Modify

Re: [CentOS] Running Fedora under CentOS via systemd-nspawn?

. possibly inefficient---something like HandBrake should benefit from running on bare metal, rather than under a virtualized CPU. On Wed, Nov 18, 2015 at 1:11 PM, Lamar Owen <lo...@pari.edu> wrote: > On 11/17/2015 12:39 PM, Matt Garman wrote: >> >> Now I have a need for

[CentOS] Running Fedora under CentOS via systemd-nspawn?

tl;dr - Is anybody "running" a Fedora system via systemd-nspawn under CentOS? Long version: Before CentOS 7, I used chroot to create "lightweight containers" where I could cleanly add extra repos and/or software without the risk of "polluting" my main system (and potentially ending up in

Re: [CentOS] Screen

If you're just getting starting with a screen multiplexer, I'd suggest starting with tmux. My understanding is that GNU screen has effectively been abandoned. I used GNU screen for at least 10 years, and recently switched to tmux. As someone else said, in GNU screen, if you want to send ctrl-a

Re: [CentOS] CentOS 6 gcc is a bit old

Take a look at Devtoolset, I think this will give you what you want: https://www.softwarecollections.org/en/scls/rhscl/devtoolset-3/ On Mon, Jun 29, 2015 at 1:56 PM, Michael Hennebry henne...@web.cs.ndsu.nodak.edu wrote: gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-11) is a bit old. There have

[CentOS] managing logins for different classes of servers

Our environment has several classes of servers, such as development, production, qa, utility, etc. Then we have all our users. There's no obvious mapping between users and server class. Some users may have access to only one class, some may span multiple classes, etc. And for maximum

Re: [CentOS] nfs (or tcp or scheduler) changes between centos 5 and 6?

On Thu, Apr 30, 2015 at 7:31 AM, Peter van Hooft ho...@natlab.research.philips.com wrote: You may want to try reducing sunrpc.tcp_max_slot_table_entries . In CentOS 5 the number of slots is fixed: sunrpc.tcp_slot_table_entries = 16 In CentOS 6, this number is dynamic with a maximum of

Re: [CentOS] nfs (or tcp or scheduler) changes between centos 5 and 6?

On Wed, Apr 29, 2015 at 10:51 AM, m.r...@5-cent.us wrote: The server in this case isn't a Linux box with an ext4 file system - so that won't help ... What kind of filesystem is it? I note that xfs also has barrier as a mount option. The server is a NetApp FAS6280. It's using NetApp's

[CentOS] nfs (or tcp or scheduler) changes between centos 5 and 6?

We have a compute cluster of about 100 machines that do a read-only NFS mount to a big NAS filer (a NetApp FAS6280). The jobs running on these boxes are analysis/simulation jobs that constantly read data off the NAS. We recently upgraded all these machines from CentOS 5.7 to CentOS 6.5. We did a

Re: [CentOS] nfs (or tcp or scheduler) changes between centos 5 and 6?

On Wed, Apr 29, 2015 at 10:36 AM, Devin Reade g...@gno.org wrote: Have you looked at the client-side NFS cache? Perhaps the C6 cache is either disabled, has fewer resources, or is invalidating faster? (I don't think that would explain the C5 starvation, though, unless it's a secondary effect

Re: [CentOS] CentOS 7 NFS client problems

What does your /etc/idmapd.conf look like on the server side? I fought with this quite a bit a while ago, but my use case was a bit different, and I was working with CentOS 5 and 6. Still, the kicker for me was updating the [Translation] section of /etc/idmapd.conf. Mine looks like this:

[CentOS] centos kernel changelog?

I'm probably overlooking something simple, but I can't seem to find a concise changelog for the rhel/centos kernel. I'm on an oldish 6.5 kernel (2.6.32-431), and I want to look at the changes and fixes for every kernel that has been released since, all the way up to the current 6.6 kernel.

Re: [CentOS] centos kernel changelog?

On Thu, Apr 9, 2015 at 8:49 AM, Johnny Hughes joh...@centos.org wrote: rpm -qp --changelog rpm-name | less NOTE: This works for any kernel RPM in any version of CentOS ... you can download the latest 6 RPM from here: http://mirror.centos.org/centos/6/updates/x86_64/Packages/ (currently

[CentOS-virt] virsh list hangs / guests not starting automatically

I followed the wiki[1] to create a KVM virtual machine using bridged network on CentOS 6.5. It seemed to work fine on initial setup. (FWIW I'm trying to run a MythBuntu guest.) However, after a reboot, it doesn't auto-start the VMs. Shortly after boot, if I go into virsh, then do a list, it just

Re: [CentOS-virt] virsh list hangs / guests not starting automatically

+: 4660: error : virFileReadAll:462 : Failed to open file '/proc/8017/stat': No such file or directory 2014-10-14 17:26:34.679+: 4661: info : remoteDispatchAuthList:2398 : Bypass polkit auth for privileged client pid:11343,uid:0 On Tue, Oct 14, 2014 at 12:08 PM, Matt Garman matthew.gar

Re: [CentOS] centos 6.5 input lag

it work, or it's implementation is broken. Curiously, however, running my bond0 in 802.3ad mode did work without any issue for over a month. Anyway, hopefully this might help someone else struggling with a similar problem. On Fri, Oct 10, 2014 at 4:17 PM, Matt Garman matthew.gar...@gmail.com

Re: [CentOS] centos 6.5 input lag

On Thu, Oct 9, 2014 at 11:20 PM, Joseph L. Brunner j...@affirmedsystems.com wrote: Is it under some type of ddos attack? What's running on this machine? In front of it? A DDOS attack seems unlikely, though I suppose it's possible. Sitting between the lagging machine and the Internet is a

Re: [CentOS] centos 6.5 input lag

On Fri, Oct 10, 2014 at 4:11 PM, Joseph L. Brunner j...@affirmedsystems.com wrote: If this is a server - is it possible your raid card battery died? It is a server, but a home file server. The raid card has no battery backup, and in fact has been flashed to pure HBA mode. Actual RAID'ing is

[CentOS] centos 6.5 input lag

I have a CentOS 6.5 x86_64 system that's been running problem-free for quite a while. Recently, it's locked-up hard several times. It's a headless server, but I do have IP KVM. However, when it's locked up, all I can see are a few lines of kernel stack trace. No hints to the problem in the

[CentOS] virsh list hangs

I followed the wiki[1] to create a KVM virtual machine using bridged network on CentOS 6.5. It seemed to work fine on initial setup. However, after a boot, it doesn't auto-start the VMs, or at least, something has to timeout (a *very* long time, on the order of 15--30 minutes) before they can be

Re: [CentOS] lost packets - Bond

On Wed, Sep 17, 2014 at 11:28 AM, Eduardo Augusto Pinto edua...@eapx.com.br wrote: I'm using in my bond interfaces as active backup, in theory, should assume an interface (or work) only when another interface is down. But I'm just lost packets on the interface that is not being used and is

[CentOS] grubby fatal error: unable to find a suitable template

I did a bulk yum update -y of several servers. As a sanity check after the upgrade, I ran a grep of /etc/grub.conf across all updated servers looking to ensure the kernel I expected was installed. Two servers came up saying /etc/grub.conf did not exist! I logged into the servers, and

Re: [CentOS] grubby fatal error: unable to find a suitable template

On Wed, Jun 25, 2014 at 4:47 PM, m.r...@5-cent.us wrote: ? Why not to 5.10, the current release of CentOS 5.x? Off topic for the question, but, briefly, changing *anything* in our environment involves extensive testing and validation due to very precise performance requirements (HFT,

Re: [CentOS] copying user accounts...

I've used usermod -p encrypted password username successfully many times. Just be careful with escaping of the '$' field separators that appear in the encrypted password string from /etc/shadow. On Tue, Jun 10, 2014 at 4:28 PM, John R Pierce pie...@hogranch.com wrote: I want to copy a few

Re: [CentOS] Mother board recommendation

On Fri, May 16, 2014 at 7:21 AM, Joseph Hesse joehe...@gmail.com wrote: I want to build a lightweight server and install centos. Does anyone have a recommendation for a suitable motherboard? What will the role of the server be? How lightweight? How many users, what kinds of services, what

Re: [CentOS] High load average, low CPU utilization

On Fri, Mar 28, 2014 at 9:01 AM, Mr Queue li...@mrqueue.com wrote: On Thu, 27 Mar 2014 17:20:22 -0500 Matt Garman matthew.gar...@gmail.com wrote: Anyone seen anything like this? Any thoughts or ideas? Post some data.. This public facing? Are you getting sprayed down by packets? Array

Re: [CentOS] High load average, low CPU utilization

On Fri, Mar 28, 2014 at 10:30 AM, John Doe jd...@yahoo.com wrote: Any USB device? Each time I access USB disks, load goes through the roof. Nope, it's a rack server in a secure remote location, with no peripherals at all attached. Only attached cables are power and network.

Re: [CentOS] High load average, low CPU utilization

On Fri, Mar 28, 2014 at 9:37 AM, John R. Dennison j...@gerdesas.com wrote: On Fri, Mar 28, 2014 at 09:30:17AM -0500, Matt Garman wrote: How can the loadavg shoot up (from ~1 to ~20) without a corresponding uptick in number of tasks? loadavg is based on number of processes vying for cpu

[CentOS] High load average, low CPU utilization

I have a dual Xeon 5130 (four total CPUs) server running CentOS 5.7. Approximately every 17 hours, the load on this server slowly creeps up until it hits 20, then slowly goes back down. The most recent example started around 2:00am this morning. Outside of these weird times, the load never

Re: [CentOS] zoneminder

On Thu, Feb 6, 2014 at 9:33 AM, m.r...@5-cent.us wrote: One more thing about zoneminder: after installing it on an FC19 system, I don't see anything that I could immediately identify as a driver. *HOW* does it get the video? In motion, the very lightweight package, it's using V4L2, and the

Re: [CentOS] Motion Detecting Camera

On Mon, Feb 3, 2014 at 2:15 PM, m.r...@5-cent.us wrote: 2) My manager says he wants to be out of the business of this, and wants me to look into surveillance appliance packages - that is, a DVR w/ say, four cameras. They're all in Does this mean ZoneMinder is out of the question,

Re: [CentOS] OT hardware question

On Fri, Jan 31, 2014 at 9:52 AM, m.r...@5-cent.us wrote: With the continuing annoyance from motion, my manager's asked me to go looking again for a video surveillance appliance: basically, a motion-detecting DVR and cameras. The big thing, of course, is a) price (this is a US federal gov't

Re: [CentOS] OT hardware question

On Fri, Jan 31, 2014 at 11:00 AM, m.r...@5-cent.us wrote: I think you misunderstood me. I'm not looking for IP cameras - we'll be getting cameras that plug into a surveillance DVR appliance. It's the -DVR's- firmware software will do the recording and picture taking. What we need is to be

Re: [CentOS] OT hardware question

On Fri, Jan 31, 2014 at 12:45 PM, m.r...@5-cent.us wrote: Mostly likely it *will*. I think we expect to get a surveillance appliance - a DVR with firmware, and cameras as part of the package. The ancient USB cheapie webcams will go. I see, so you're looking at a complete package that includes

Re: [CentOS] OT hardware question

On Fri, Jan 31, 2014 at 12:50 PM, m.r...@5-cent.us wrote: ...but my manage says he'd like to get out of the business of making video surveillance work, when there's off-the-shelf stuff out there. Sounds like a classic problem where you have three requirements... 1. Just works /

Re: [CentOS] NIS or not?

On Tue, Jan 28, 2014 at 3:02 AM, Sorin Srbu sorin.s...@orgfarm.uu.se wrote: The only thing I'm trying to accomplish is a system which will allow me to keep user accounts and passwords in one place, with one place only to administrate. NIS seems to be able to do that. Comments and insights are

Re: [CentOS] NIS or not?

On Tue, Jan 28, 2014 at 9:18 AM, m.r...@5-cent.us wrote: At this late date, I'd be really, *REALLY* leery of using NIS. You say that *most* of your traffic is local, suggesting that some of it is *not*. And, for that matter, how good are the firewalls keeping other traffic out? I'd say no

Re: [CentOS] Do I need a dedicated firewall?

On Wed, Dec 11, 2013 at 11:00 PM, Jason T. Slack-Moehrle slackmoeh...@gmail.com wrote: So my electricity bill is through the roof and I need to pair down some equipment. If you are in the USA, get yourself a Kill-a-Watt power meter. I'm sure other parts of the world have similar products.

Re: [CentOS] making a script into a service

Turn it into a daemon as described, then take a look at the existing scripts in /etc/init.d/. There might even be a template in there iirc. Your script will likely be a simple wrapper around your daemonized python program. After that, just do a chkconfig --add myscript“ where myscript is the name

[CentOS] quota doesn't appear to work - repquota only updates when quotacheck is run

I have set up user quotas on an ext4 filesystem. It does not appear that the quota system is being updated, except when I manually run quotacheck. More detail: I run warnquota -s from a script in /etc/cron.daily. I noticed that no one had received an over quota message in a long time. Using

[CentOS] clock sync/drift

Hi, We have a little over 100 servers, almost all running CentOS 5.7. Virtually all are Dell servers, generally a mix of 1950s, R610s, and R410s. We use NTP and/or PTP to sync their clocks. One phenomenon we've noticed is that (1) on reboot, the clocks are all greatly out of sync, and (2) if

Re: [CentOS] Off-Topic: Low Power Hardware

On Fri, Jan 11, 2013 at 8:55 AM, SilverTip257 silvertip...@gmail.com wrote: I'm in search of some hardware that consumes a low amount of power for use as a test-bed for Linux, various coding projects, and LAN services. 1) Low power consumption (10-15W ... maybe 30W at most) 2) Must run Linux

Re: [CentOS] home directory server performance issues

On Tue, Dec 11, 2012 at 1:58 AM, Nicolas KOWALSKI nicolas.kowal...@gmail.com wrote: On Mon, Dec 10, 2012 at 11:37:50AM -0600, Matt Garman wrote: OS is CentOS 5.6, home directory partition is ext3, with options “rw,data=journal,usrquota”. Is the data=journal option really wanted here? Did you

Re: [CentOS] home directory server performance issues

On Tue, Dec 11, 2012 at 2:24 PM, Dan Young danielmyo...@gmail.com wrote: Just going to throw this out there. What is RPCNFSDCOUNT in /etc/sysconfig/nfs? It was 64 (upped from the default of... 8 I think). ___ CentOS mailing list CentOS@centos.org

Re: [CentOS] home directory server performance issues

On Tue, Dec 11, 2012 at 4:01 PM, Steve Thompson s...@vgersoft.com wrote: This is in fact a very interesting question. The default value of RPCNFSDCOUNT (8) is in my opinion way too low for many kinds of NFS servers. My own setup has 7 NFS servers ranging from small ones (7 TB disk served) to

Re: [CentOS] home directory server performance issues

On Wed, Dec 12, 2012 at 12:29 AM, Gordon Messmer yiny...@eburg.com wrote: That may be difficult at this point, because you really want to start by measuring the number of IOPS. That's difficult to do if your applications demand more than your hardware currently provices. Since my original

[CentOS] home directory server performance issues

I’m looking for advice and considerations on how to optimally setup and deploy an NFS-based home directory server. In particular: (1) how to determine hardware requirements, and (2) how to best setup and configure the server. We actually have a system in place, but the performance is pretty

Re: [CentOS] Static routes with a metric?

Adding additional info for posterity, and in case anyone else runs across this... On Wed, Dec 7, 2011 at 12:28 PM, Benjamin Franz jfr...@freerun.com wrote: On 12/7/2011 10:03 AM, Matt Garman wrote: Hi, [...] What I basically need to be able to do is this: route add -host h1 gw g1 metric 0

[CentOS] Static routes with a metric?

Hi, How can I define static routes to be created at boot time with a specific metric? I have two NICs that ultimately end up at the same peer, but literally go through two completely different networks. IOW, each NIC connects to a different layer 3 device. Also, note that the machine actually

Re: [CentOS] ibm m1015 w/sandy bridge boot failure

On Thu, Oct 27, 2011 at 09:18:56AM -0500, Matt Garman wrote: I have a server running CentOS 6.0. Last night I replaced the CPU and motherboard. Old hardware: Supermicro x8sil-f + x3440. New hardware: Supermicro x9scl+-f + E3-1230. This is a new Sandy Bridge Xeon. Everything else remained

[CentOS] ibm m1015 w/sandy bridge boot failure

I have a server running CentOS 6.0. Last night I replaced the CPU and motherboard. Old hardware: Supermicro x8sil-f + x3440. New hardware: Supermicro x9scl+-f + E3-1230. This is a new Sandy Bridge Xeon. Everything else remained the same, including an IBM m1015 SAS HBA. This is just an IBM

[CentOS] how to stop an in-progress fsck that runs at boot?

I can't seem to find the answer to this question via web search... I changed some hardware on a server, and upon powering it back on, got the /dev/xxx has gone 40 days without being check, check forced message. Now it's running fsck on a huge (2 TB) ext3 filesystem (5400 RPM drives no less). How

Re: [CentOS] NetApp DataFabric Manager/Sybase/SQLAnywhere on CentOS?

On Wed, Jul 20, 2011 at 12:39 PM, James Hogarth james.hoga...@gmail.com wrote: I am trying to install DFM 4.0.2, and have tried on both CentOS 4.8 i386 and CentOS 5.5 x86_64.  I have edited my /etc/redhat-release file to be equal to RHEL's, as the DFM installer immediately aborts if that isn't

[CentOS] NetApp DataFabric Manager/Sybase/SQLAnywhere on CentOS?

Hello, Has anyone out there successfully installed NetApp's DataFabric Manager (DFM) on CentOS? If so, what version of DFM, CentOS, and what architecture? I am trying to install DFM 4.0.2, and have tried on both CentOS 4.8 i386 and CentOS 5.5 x86_64. I have edited my /etc/redhat-release file

Re: [CentOS] scheduling differences between CentOS 4 and CentOS 5?

On Tue, May 24, 2011 at 02:22:12PM -0400, R P Herrold wrote: On Mon, 23 May 2011, Mag Gam wrote: I would like to confirm Matt's claim. I too experienced larger latencies with Centos 5.x compared to 4.x. My application is very network sensitive and its easy to prove using lat_tcp.

[CentOS] scheduling differences between CentOS 4 and CentOS 5?

We have several latency-sensitive pipeline-style programs that have a measurable performance degredation when run on CentOS 5.x versus CentOS 4.x. By pipeline program, I mean one that has multiple threads. The mutiple threads work on shared data. Between each thread, there is a queue. So