Re: [CentOS] Intel/64 CentOS VM running on a Mac M1?

[Thomas Bendler]

On Fri, Jan 29, 2021 at 10:42 AM Simon Matter 
wrote:

> [...]
> Most likely you're running an Ubuntu arch build then?
>

Yep, it's the Ubuntu aarch64 build. I haven't the time yet to try other
builds as well. I just got the M1, but if I find some time I will also do
some tests with other distributions.


> The IP wanted "support IA64 based OS's and it *needs* to be an exact (VM)
> copy of production" which most likely means "x86_64" code (not really IA64
> which is Itanium, isn't it?).
>

I have no clue if this was a typo or really the intention, only the IP can
tell.
My understanding was that the VMs are used for development. The compilation
could be performed cross platform, the only restriction would be you can't
test
it locally, but with IA64 this wasn't possible before.

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Re: [CentOS] Intel/64 CentOS VM running on a Mac M1?

[Thomas Bendler]

On Fri, Jan 29, 2021 at 10:06 AM Rainer Duffner 
wrote:

> [...]
> Apple’s M1 are (probably) great - but only if you want to run macOS on it.
> Anything else and the compromises will likely be even more severe than
> those that had to be made in the earliest days of running Linux on a laptop.
> [...]


Did you try it or is this just a guess? I use Ubuntu in a VM on the M1.
As I mentioned there are currently some restrictions but the direction
already looks quite promising. At least far away from any earliest
days ...

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Re: [CentOS] Intel/64 CentOS VM running on a Mac M1?

[Thomas Bendler]

You need a virtualization solution that is supported on the M1 (currently
Parallels preview or QEMU as far as I know). Secondly you need a
distribution
that supports aarch64 (Ubuntu, CentOS and some others). This should be
sufficient to start with. However, all of this is in an early development
stage,
so several things might not work (e.g. the Parallel Tools are not available
for
aarch64 right now).

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Re: [CentOS] RHEL changes

[Thomas Bendler]

On Thu, Jan 21, 2021 at 11:15 PM Nicolas Kovacs  wrote:

> Le 21/01/2021 à 22:17, Valeri Galtsev a écrit :
> > I tried Oracle Linux. After installation it took forever to update yum
> > database, or do you yum search. Also: I didn't find mirrors... All this
> sort of
> > ruled it out for me.
>
> Works perfectly here:
>
> https://gitlab.com/kikinovak/oracle/-/blob/master/linux-setup.sh
>
> You might want to give it another spin.
> [...]


Nice script but wouldn't it be easier to do such a thing with Ansible/
Puppet/ or
the like? You can refer in most cases to the RHEL family what would make it
work
on all flavours. You only have to adjust the parts with the specific URLs
...

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Re: [CentOS] CentOS Stream suitability as a production webserver

[Thomas Bendler]

On Wed, Jan 6, 2021 at 1:22 AM Gordon Messmer 
wrote:

> On 1/5/21 3:39 PM, Valeri Galtsev wrote:
> > And as someone mentioned, these other distributions have long great
> > record of system upgrade from one release to another. CentOS has no
> > record (and probably no upgrade engineered yet). In that respect
> > CentOS Stream is way behind...
> In that respect, CentOS Stream is identical to CentOS.
> [...]


No, definitely not. With CentOS you need to perform this exercise every ten
years. With Stream every five years. This is a 100% effort/ costs
difference which becomes a significant factor when you run more than a
static web server.

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Re: [CentOS] Is EPEL compatible with Stream?

[Thomas Bendler]

On Mon, Jan 4, 2021 at 6:44 AM Gordon Messmer 
wrote:

> On 1/3/21 8:05 PM, Mark LaPierre wrote:
> > So how would one use this shiny bit of information?  Is there a way to
> > discover if an EPEL application is going to clobber your system before
> > you install it?
> As long as the upstream developers observe semantic versioning, dnf
> would tell whether or not a package is "broken" by an update (it would
> have unresolvable dependencies.)
>

EPEL assumes according to their website RHEL point releases. It will pretty
much
likely work with CentOS Stream as well, but as Mark said, you'll see it
after you've
installed the package. On the other hand, EPEL is a community project
anyhow, so
in real production scenarios you need your own CI for upgrades/ patches.

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Re: [CentOS] Is Oracle a real alternative to Centos?

[Thomas Bendler]

On Thu, Dec 17, 2020 at 1:42 AM Nate Duehr  wrote:

> -- Original Message --
> From: "Matti Pulkkinen" 
> >As someone who is considering moving to OL, I wonder if you could
> elaborate clearly on what specific concerns you have, without the
> insinuation and analogy? Oracle's proposition [1] seems pretty
> straightforward to me.
> >
> That they'' eventually treat it to the same lawyers who've changed Java
> licensing.
>

That is quite unlikely because JAVA is something they own since they bought
SUN. OEL, however, is something they build based on RHELs work. In this
respect, they only own the logos and the like, but that's it. So they might
in the future stop the free usage of OEL, but they can't sue anyone. The
only exception would be when you illegitimately use their logos or where
else they own the copyright/ trademark.

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Re: [CentOS] On-demand audio streaming software

[Thomas Bendler]

On Wed, Dec 16, 2020 at 12:16 PM Nicolas Kovacs  wrote:

> [...]
> I wonder if there's some software that can stream on-demand audio like
> music
> playlists or podcasts. What I'd like to do is host a series of playlists
> (like
> "Radio Show of the week") or podcasts, and then someone who wants to
> listen to
> it clicks on it and can listen to it from start to end.
>
> Any suggestions?
>

Something like this:

https://gitlab.com/davinkevin/Podcast-Server

maybe?

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Re: [CentOS] CentOS 8 future

[Thomas Bendler]

On Tue, Dec 15, 2020 at 9:18 AM Patrick Bégou <
patrick.be...@legi.grenoble-inp.fr> wrote:

> I'm also using CentOS for a while and I'm deploying a CentOS8 cluster
> for some months because it was supported until 2029! Bad idea.
> For me, using debian has 2 important drawbacks
> - some of proprietary software we are using is certified RHEL and SLES.
> Deploying on CentOS is out-of-thebox. Deploying on debian (we have also
> debian servers) is often a nightmare and some functionalities still
> doesn't work (and support reply "debian is not supported"). We have no
> alternative for these softwares.
> [...]


If you have to deal with proprietary software, OEL is currently the only
cost-free
option you have (if an RHEL clone is wanted). The advantage with OEL is that
most proprietary software supports OEL out-of-the-box, you don't have to do
"naming" tricks to run software like SAP.

Switching to OEL is quite easy (https://github.com/oracle/centos2ol) and the
same method could be used to switch to something else if better options are
available.

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Re: [CentOS] CentOS Stream from bottom works, what is this?

[Thomas Bendler]

On Thu, Dec 10, 2020 at 3:54 PM Simon Matter  wrote:

> [...]
> Do you mean something like this?
>
> https://linux.oracle.com/switch/centos2ol.sh
> [...]


Haven't tried this one, but yes, this is from a principal point of view
what I mean.

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Re: [CentOS] CentOS Stream from bottom works, what is this?

[Thomas Bendler]

On Wed, Dec 9, 2020 at 7:19 PM Matthew Miller  wrote:

> [...]
> In the cases where RHEL + 0.1 (note not +1) won't work, I think it's
> incredibly likely that this will be covered by the expanded low- and
> no-cost
> RHEL offerings.
>
> Part of the buried lede here is that with more RHEL accessibility, a lot of
> the function that CentOS served for users will not be necessary anymore.
> [...]


If RH plans to release a successor for CentOS 8 like RHEL 8 Free or so,
this has become a communication disaster par excellence. The announcement
with all the associated uncertainties and criticism was already picked up
by the major press. I've no clue who is in charge of RH for the
communication, but the team was quite bad in their job.

If I plan something like this I would say, listen, CentOS will be released
as Stream only in the future but the deprecated CentOS versions will be
replaced by X. Before we do this change we'll provide to you a script that
transforms your current CentOS installation into the designated successor.
I'm quite relaxed as I don't use CentOS anymore except for private stuff.
But I can fully understand those who already upgraded to C8 with the
assumption in mind that they can use CentOS for the next few years with the
expected behaviour.

Changes are part of the IT and maybe the situation won't become as dramatic
as the one or other may fear (especially if a kind of RHEL 8 Free will be
released), but the communication around this change is a perfect example
how you shouldn't do the communication.

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Re: [CentOS] ssacli start rebuild?

[Thomas Bendler]

Am Mi., 11. Nov. 2020 um 07:28 Uhr schrieb hw :

> [...]
> With this experience, these controllers are now deprecated.  RAID
> controllers
> that can't rebuild an array after a disk has failed and has been replaced
> are virtually useless.
> [...]


HW RAID is often delivered with quite limited functionality. Because of
this I switched in most cases to software RAID meanwhile and configured the
HW RAID as JBOD. The funny thing is, when you use the discs previously used
in the HW RAID in such a scenario, the software RAID detects them as RAID
disks. It looks like a significant amount of HW RAID controllers use the
Linux software RAID code in their firmware.

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Re: [CentOS] ssacli start rebuild?

[Thomas Bendler]

Am Fr., 6. Nov. 2020 um 20:38 Uhr schrieb hw :

> [...]
> Some search results indicate that it's possible that other disks in the
> array have read errors and might prevent rebuilding for RAID 5.  I don't
> know if there are read errors, and if it's read errors, I think it would
> mean that these errors would have to affect just the disk which is
> mirroring the disk that failed, this being a RAID 1+0.  But if the RAID
> is striped across all the disks, that could be any or all of them.
>
> The array is still in production and still works, so it should just
> rebuild.
> Now the plan is to use another 8TB disk once it arrives, make a new RAID 1
> with the two new disks and copy the data over.  The remaining 4TB disks can
> then be used to make a new array.
>
> Learn from this that it can be a bad idea to use a RAID 0 for backups and
> that
> least one generation of backups must be on redundant storage ...
>

Just checked on one of my HP boxes, you can indeed not figure out if one of
the discs has read errors. Do you have the option to reboot the box and
check on the controller directly?

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Re: [CentOS] ssacli start rebuild?

[Thomas Bendler]

Am Fr., 6. Nov. 2020 um 00:52 Uhr schrieb hw :

> [...]
>   logicaldrive 1 (14.55 TB, RAID 1+0, Ready for Rebuild)
> [...]


Have you checked the rebuild priority:

❯ ssacli ctrl slot=0 show config detail | grep "Rebuild Priority"
  ~
   Rebuild Priority: Medium
❯

Slot needs to be adjusted to your configuration.

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Re: [CentOS] Server entering Emergency Shell, but continues fine after pressing Enter

[Thomas Bendler]

Hi Quinn,

Am Do., 10. Sept. 2020 um 04:49 Uhr schrieb Quinn Comendant <
qu...@strangecode.com>:

> [...]
> I don't see any significant errors in the boot log, but I would appreciate
> if anyone has a moment to help me look for issues. Here's a copy of the
> serial console boot log – you can find the "Press Enter to continue" on
> line 536: https://write.as/dwuts24dcw6yh0kf.txt
> [...]


If I'm not mistaken, problems after UTMP point to problems with X/ hardware
configuration. So I guess you might find more information when you also
have a look at the log files of systemd.

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Re: [CentOS] DVR recorder how to resucue files

[Thomas Bendler]

Am Do., 27. Aug. 2020 um 13:07 Uhr schrieb :

> [...]
> no partions are shown with dd.
> [...]


dd does not show partitions, fdisk does (or parted or ...).

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Re: [CentOS] DVR recorder how to resucue files

[Thomas Bendler]

It looks like you've backuped an entire disk that might contain partitions.
So first check if you have partitions inside:

sudo fdisk -lu save.dd

If you have partitions inside, use the start offset of the partition to
create a loopback device (e.g. a partition starts at 56):

sudo losetup -o $((56*512)) /dev/loop0 save.dd

Now you should be able to use the partition. First check and than mount it:

sudo fsck -fv /dev/loop0
sudo mount /dev/loop0 /mnt

Kind regards
Thomas

Am Mi., 26. Aug. 2020 um 15:49 Uhr schrieb :

>
> Ralf Prengel  wrote:
>
> >  I made a backup using dd without any problems but how can I mount
> > this  image.
> >  Normal loop options don't work.
>
> Too little information. Tell us what you tried (the exact command) and
> what happened (any error message).
>
> Ok,
> sorry.
> Our recoder device that stores all videos of several cameras doesn t work
> any longer.
> Before doing anything on the the device or the disk I made a full backup
> oft he disk with dd.
> Trying to mount this file simple with mount -o loop save.dd /mnt/backup
> fails.
> I found out that VDR are using non-standard disk-configurations and
> filesystems.
> So my question if there is a way to get access the files in the image.
> Tools like parted don t show partions in the  bckup-file.
>
> Thanks
> Ralf
>
> Ralf Prengel
> Teamleiter
> Customer Care
> Comline AG
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> D-44227 Dortmund/Germany
>
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> Mobil:+49 151 10831 157
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> E-Mail:ralf.pren...@comline.de
>
> www.comline.de
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> Aufsichtsratsvorsitzender: N.N.
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Re: [CentOS] server setup best practices

[Thomas Bendler]

Hi Chris,

There is no general best practice available as it heavily depends on the
use case/ support requirements and other factors. For example, I start with
a minimum installation and then I use Ansible to apply my personal/ company
flavor (tools/ configuration/ ...). The result is a core VM that is the
starting point for the application deployment. Depending on the size of the
installation and skills of the support team, you can use devops processes
for the applications as well, for example installing prerequisites or even
the application itself.

Kind regards Thomas

Am Mi., 8. Juli 2020 um 17:49 Uhr schrieb Christopher Wensink <
cwens...@five-star-plastics.com>:

> Everyone,
>
> I am in the process of migrating over a samba Linux VM from an openvz
> based system to a vmware based system.  I am migrating over these services:
>
> apache
> samba
> rsync (daemon via xinetd)
>
> I'm trying to improve my documentation and I want to make a linux vm
> best practices SOP that can be used as the template for all new server
> setups.  Does anyone have any similar kinds of documentation that they
> would be willing to share (excluding confidential / credentials, etc)
>
> Chris
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Re: [CentOS] Blog article about the state of CentOS

[Thomas Bendler]

Hi Johnny,

Am Mi., 17. Juni 2020 um 16:16 Uhr schrieb Johnny Hughes :

> [...]
> No one is trynig to make anything slower.
>

This is good to hear but ...

> [...]
> I can assure you .. I am working my butt off everyday to make CentOS
> Linux the best it can be.  If you want to compare what the CentOS team
> (a small team) can do compared to Oracle (a tmulti billin dollar
> corporation who bought Sun Microsystems .. took over Java and Open
> Office, etc)  .. well, we can not provide the resources they can provide.
> [...]


... then I'm missing some kind of strategy on how to improve things (or
maybe I simply don't know they exist). Without having a detailed background
about the project setup and the way the small team works, I would at a
first glance assume that there are two options to improve. One would be to
make the team bigger (as you said, it's open and I'm pretty sure there are
enough volunteers) or a second one, by increasing the automation level for
the CentOS production.

What do you think and are there discussions in the core CentOS community to
go either one of these routes?

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Re: [CentOS] system unresponsive

[Thomas Bendler]

You should be able to recognize or monitor this by configure the syslog to
print everything on a specific TTY or use the remote logging functionality.

Kind regards Thomas

Am Do., 23. Mai 2019 um 18:31 Uhr schrieb Jon Pruente <
jprue...@riskanalytics.com>:

> On Wed, May 22, 2019 at 10:02 AM mark  wrote:
>
> > That seems unlikely. Foe one, I've seen that... but I *always* see
> entries
> > in the log about the oom-killer being invoked. For another, this isn't a
> > compute node, it's *only* a fileserver, serving projects, home
> > directories, and backups (home-grown b/u, uses rsync), and backups don't
> > start until well after midnight, and as we're business-hours only, there
> > was less usage, and it does have 256G RAM
> >
>
> I have two servers that would lock up like this occasionally, and if I let
> them sit at the console long enough sometimes they would give a login
> prompt. It took a lot of time and frustration (these are prod servers) but
> I tracked it down to a problem in the XFS driver, as it never occurred on
> the systems with EXT4 filesystems. The XFS driver would hang, preventing
> writes to the filesystem. I could identify exactly when that happened as
> all system logging would suddenly stop at the same second. Then OOMKiller
> would come in and start killing off processes but that wouldn't be in the
> logs on disk because the file system couldn't write. I rolled the servers
> back to a 5xx series kernel and the issue didn't resurface. I recently let
> them boot the newer 9xx series kernels and I'm hoping the XFS issue is
> fixed.
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Re: [CentOS] Are these instructions meant to be executed on CentOS 1804?

[Thomas Bendler]

It doesn't matter which host os you use as long as you match the
requirements stated in the article:

"To continue with this tutorial, you'll need to have GCC, make, ncurses,
Perl and grub tools (specifically grub-install) installed on the host
machine."

Kind regards Thomas

Am Mo., 8. Okt. 2018 um 12:18 Uhr schrieb Turritopsis Dohrnii Teo En Ming <
turritopsis.dohr...@teo-en-ming.com>:

> Good afternoon from Singapore, I came across this Linux Journal article
> titled "DIY: Build a Custom Minimal Linux Distribution from Source",
> written by Petros Koutoupis. Link: <
> https://www.linuxjournal.com/content/diy-build-custom-minimal-linux-distribution-source>
>
> https://www.linuxjournal.com/content/diy-build-custom-minimal-linux-distribution-source
> Are the instructions in this article meant to be executed with ease on
> CentOS 1804 or perhaps easier on other Linux distros? Please advise. Thank
> you.
>
>
> ===BEGIN SIGNATURE===
>
> Blogs: Turritopsis Dohrnii Teo En Ming's Academic Qualifications as at 30
> Oct 2017
>
> [1] https://tdtemcerts.wordpress.com/
>
> [2] http://tdtemcerts.blogspot.sg/
>
> [3]
> https://www.scribd.com/user/270125049/Teo-En-Ming
>
> ===END SIGNATURE===
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