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 re-b
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.
>
>
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 has
Adding additional info for posterity, and in case anyone else runs
across this...
On Wed, Dec 7, 2011 at 12:28 PM, Benjamin Franz wrote:
> On 12/7/2011 10:03 AM, Matt Garman wrote:
>> Hi,
>>
>> [...]
>>
>> What I basically need to be able to do is this:
>
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 th
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.
>
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
On Wed, Jul 20, 2011 at 12:39 PM, James Hogarth 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 right. However
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). Ho
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.
Anyone
On Thu, Apr 9, 2015 at 8:49 AM, Johnny Hughes wrote:
> rpm -qp --changelog | 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 kernel-2.6.32-504.12
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:
[Trans
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
On Wed, Apr 29, 2015 at 10:36 AM, Devin Reade 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 from retr
On Wed, Apr 29, 2015 at 10:51 AM, 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 filesystem. I
On Thu, Apr 30, 2015 at 7:31 AM, Peter van Hooft
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
>> sunrpc.tcp_max_slot_table_entries
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 c
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
wrote:
> gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-11) is a bit old.
> There have been major changes since the
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
t
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 dependen
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 /e
blem. And not to mention. 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 wrote:
> On 11/17/2015 12:39 PM, Matt Garman wrote:
>>
>> Now I have a need
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
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 mach
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
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
(rw,noatime,nodiratime,usrjquota=aquota.user,jqfmt=vfsv0,data=writeback,nobh,barrier=
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 bad--
On Tue, Dec 11, 2012 at 1:58 AM, Nicolas KOWALSKI
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?
On Tue, Dec 11, 2012 at 2:24 PM, Dan Young 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
http://lists.centos.org/m
On Tue, Dec 11, 2012 at 4:01 PM, Steve Thompson 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 larger ones (25
On Wed, Dec 12, 2012 at 12:29 AM, Gordon Messmer 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 posting, we tempor
On Fri, Jan 11, 2013 at 8:55 AM, SilverTip257 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 without too much f
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 the
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
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 “ where myscript is the
name of your
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 produc
On Tue, Jan 28, 2014 at 3:02 AM, Sorin Srbu 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 much appreciated!
On Tue, Jan 28, 2014 at 9:18 AM, 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 to NIS. Yes,
On Fri, Jan 31, 2014 at 9:52 AM, 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 agency, and bei
On Fri, Jan 31, 2014 at 11:00 AM, 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 able to d/l *f
On Fri, Jan 31, 2014 at 12:45 PM, 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
everything.
On Fri, Jan 31, 2014 at 12:50 PM, 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" / off-the-shelf, no man
On Mon, Feb 3, 2014 at 2:15 PM, 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, since it
On Thu, Feb 6, 2014 at 9:33 AM, 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 drivers, gspca*
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 excee
On Fri, Mar 28, 2014 at 9:01 AM, Mr Queue wrote:
> On Thu, 27 Mar 2014 17:20:22 -0500
> Matt Garman wrote:
>
> > Anyone seen anything like this? Any thoughts or ideas?
>
> Post some data.. This public facing? Are you getting sprayed down by
> packets? Array? Soft/ha
On Fri, Mar 28, 2014 at 10:30 AM, John Doe 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.
_
On Fri, Mar 28, 2014 at 9:37 AM, John R. Dennison 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 p
On Fri, May 16, 2014 at 7:21 AM, Joseph Hesse 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 (if any) performa
I've used "usermod -p " 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 wrote:
> I want to copy a few user accounts to a new system... is there a
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 /etc/grub
On Wed, Jun 25, 2014 at 4:47 PM, 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, microsecond changes make o
On Wed, Sep 17, 2014 at 11:28 AM, Eduardo Augusto Pinto
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
> generating
> pac
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 s
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
syst
On Thu, Oct 9, 2014 at 11:20 PM, Joseph L. Brunner
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 pfSense box. All
the othe
On Fri, Oct 10, 2014 at 4:11 PM, Joseph L. Brunner
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 done at the software level
er there is more required to make 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,
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 your
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: rand
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 files
> are FTP-ed to using
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 the NFS server on the
>>
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 moving files around. The fil
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.
n
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 anyone have a means to access
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
> internal network and I will see
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
> policy I would not do that.
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 problems
> accessing other sit
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
won't allow you to bri
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 b
On Wed, Mar 22, 2017 at 3:19 PM, 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 the Kerberos server
>> lo
On Wed, Mar 22, 2017 at 6:11 PM, John Jasen 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 you can only do kerberized NFS w
72 matches
Mail list logo
