Re: [CentOS] question re: ls oddity

[Stephen John Smoogen]

On 19 April 2018 at 20:12, Fred Smith  wrote:
> Hi all!
>
> I use Centos-7 all the time. I also have a Fedora-26 VM that I use only
> occasionally.
>
> Today I noticed that ls on the two systems gives different results when
> listing the same (networked) directory.
>
> the one on fedora 26 shows files with spaces in the names like this:
>
> 'CHURCH FAMILY ADDRESS AND PHONE LIST.doc'
>
> whereas the one on Centos shows it without the quotes.
>
> both systems have the same alias for ls
>
> I don't see anything based on a brief excursion of the respective man pages.
>
> the one on Centos is version 8.22, and the one on F26 is 8.27, so unless
> there is some dotfile somewhere that ls refers to for options, this must
> be a version-change.
>
> it seems like a possibly useful feature, one might be able to use that
> to avoid nasty quoting problems in shellscripts, for instance.
>
> Anybody know how that gets enabled?

This looks like it was something changed in 8.25 with various quoting options
https://savannah.gnu.org/forum/forum.php?forum_id=8445

===
  ls now quotes file names unambiguously and appropriate for use in a shell,
  when outputting to a terminal.
===

So looking at 8.22 you can get this with "ls --quoting-style=shell"
gives you 'zoo sh' versus zoo sh



>
> thanks!
>
> --
>  Fred Smith -- fre...@fcshome.stoneham.ma.us -
> "Not everyone who says to me, 'Lord, Lord,' will enter the kingdom of
>  heaven, but only he who does the will of my Father who is in heaven."
> -- Matthew 7:21 (niv) 
> -
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[CentOS] question re: ls oddity

[Fred Smith]

Hi all!

I use Centos-7 all the time. I also have a Fedora-26 VM that I use only
occasionally.

Today I noticed that ls on the two systems gives different results when
listing the same (networked) directory.

the one on fedora 26 shows files with spaces in the names like this:

'CHURCH FAMILY ADDRESS AND PHONE LIST.doc'

whereas the one on Centos shows it without the quotes.

both systems have the same alias for ls

I don't see anything based on a brief excursion of the respective man pages.

the one on Centos is version 8.22, and the one on F26 is 8.27, so unless
there is some dotfile somewhere that ls refers to for options, this must
be a version-change.

it seems like a possibly useful feature, one might be able to use that
to avoid nasty quoting problems in shellscripts, for instance.

Anybody know how that gets enabled?

thanks!

-- 
 Fred Smith -- fre...@fcshome.stoneham.ma.us -
"Not everyone who says to me, 'Lord, Lord,' will enter the kingdom of
 heaven, but only he who does the will of my Father who is in heaven."
-- Matthew 7:21 (niv) -
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Re: [CentOS] Down C6 ALL without torrent ?

[Stephen John Smoogen]

On 19 April 2018 at 05:04, Always Learning  wrote:
>
> On Thu, 2018-04-19 at 09:40 +0100, John Hodrien wrote:
>
>> > On Wed, April 18, 2018 8:36 pm, Always Learning wrote:
>
>> >> I have an aversion to using anything that comes from unknown sources, as
>> >> used by Torrent.
>
>> Can we also challenge this "torrents are untrustworthy" attitude.
>
> Having, successfully so far, resisted/repelled several devious attacks
> from the Russians, I am keen to maintain a clean, and thus secure,
> system as possible.
>
>> You can be given an ISO from a shady character under a railway bridge,
>
> I'd throw it away unused. Do not want the associated risks.
>
>> Also, why not just make your life easy and do a netinstall?
>
> That's a good idea. Never done one of them before. I can put C6 on a CD
> and a USB and boot from either.
>
>>  That way you
>> don't have to try to do anything you're not comfortable with.
>
> Comfort-ability is not my criteria. The BIOS is supposed to be 4 or 5
> years old. It won't boot from DVDs, yet it will boot from zip disks and
> other historic relics (LH120, I think one of the other choices was).
>

As with others.. this sounds 15 years old. If it says it is 4 or 5
years old.. I would be more leery of the hardware than torrents.  (And
I am very very leery of torrents but mostly because I spend  time
explaining to people that if your university blocks them I can't fix
it for you). In any case, I would do the following:

Get a cdrom with CD1 data as this installs 99% of my systems I have
dealt with. [I think out of a couple hundred, that 2 or 3 needed
anything from the second disk when installing some obscure thing.] The
second disk is mostly stuff you can install later. If you need more
than that, you need to mirror the distribution locally and set up a
pxe/tftpboot system which points to that mirror.


-- 
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Re: [CentOS] Down C6 ALL without torrent ?

[Mark Milhollan]

On Thu, 19 Apr 2018, John Hodrien wrote:
>On Thu, 19 Apr 2018, Valeri Galtsev wrote:
>>On Wed, April 18, 2018 8:36 pm, Always Learning wrote:

>>>I have a machine with a BIOS that does not permit DVD installation. It
>>>accepts everything else including some old superseded media types.

Doesn't sound 4 to 5 years old, sounds 14 or 15 years old.

>>>Is it possible to download C6 combined parts 1 and 2 not using Torrent ?

Only manually as they are distinct ISO images, each of which would have 
to be obtained first then some work done to merge them.  The CentOS 
project could produce an all-on-one image but I don't know if it would 
be popular enough for them to expend the energy -- maybe see if a SIG 
can be formed for the purpose.

>Why is a torrent source any worse than a copy off any of the official mirrors?

No reason should be necessary, but I've found it difficult to explain to 
security departments, and from time to time it attracts unwanted 
attention and can take a while for the incoming connections to stop (on 
a very limited bandwidth and/or high RTT service this can be quite 
annoying).

>Also, why not just make your life easy and do a netinstall?  That way you
>don't have to try to do anything you're not comfortable with.

Typically because a network connection isn't available and/or wanted 
during install.  There's also the CentOS provided iPXE service if 
netinstall is acceptable, or a local netinstall e.g., using cobbler.


/mark
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Re: [CentOS] tftpd server S not responding

[Steven Tardy]

Early in this thread you mentioned these are on different network subnets.
. .

Just thought about a similar issue. . .
  sysctl -a | grep rp_filter

If a packet comes in to Linux and the path BACK to the remote IP is NOT out
that same interface (asymmetric routing) the Linux kernel will drop the
packet. “rp_filter” controls how Linux behaves regarding this.

Please provide real `ifconfig` and `route -rn` and `tcpdump port 69` output
to properly diagnose. . .
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Re: [CentOS] Down C6 ALL without torrent ?

[Yves Bellefeuille]

> > Can we also challenge this "torrents are untrustworthy" attitude.
>
> Having, successfully so far, resisted/repelled several devious
> attacks from the Russians, I am keen to maintain a clean, and thus
> secure, system as possible.

If you don't trust the sha256 hashes, there's no reason to trust a
download using https.

-- 
Yves Bellefeuille



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Re: [CentOS-virt] Apparent discontinuity between advertised centos7 release 1803_01 and content of centos-release file

[Scott Dowdle]

Greetings,

- Original Message -
> Hello,
> 
> I searched centos7 in the AWS marketplace for the
> at-time-of-writing-latest centos7 image:
> https://aws.amazon.com/marketplace/pp/B00O7WM7QW?qid=1524138193326=0-1_=srh_res_product_title
> 
> I built a standard free tier t2.micro from this putative 1803_01 AMI.
> I see from the docs, this is thus a March 2018 compilation.
> When I get CLI, I get this:
> 
> [centos@ip-172-31-27-32 etc]$ cat centos-release
> CentOS Linux release 7.4.1708 (Core)
> 
> which suggests that the AMI I just launched was built on a version of
> centos compiled from upstream sources in August 2017.
> Does the release of centos7 on the marketplace sport a release
> version which does not pertain to the machine's release? Unlike with
> releases published outside AWS, the Centos cloud page does not
> specify version info as listed on AWS.
> 
> Thanks v much IA,

RHEL releases about every 6 months... and then CentOS lags behind a little bit 
as a rebuilder.

The most current release of CentOS is based on RHEL 7.4... and is dated August 
2017 (1708).  RHEL 7.5 was released a week or so ago and CentOS is frantically 
working on coming out with CentOS release based on it.  When that comes out, 
the latest release will be 1804 (or 1805, etc).

That doesn't mean there aren't in-between release updates because there are... 
but they don't re-number the whole release because of regular updates.

CentOS has a lot of products that they produce and some of them may be rebuilt 
and distributed more frequently (like CentOS Atomic Host or their Vagrant 
image, etc)... but not the oldest, main product.

Did that answer your question?

TYL,
-- 
Scott Dowdle
704 Church Street
Belgrade, MT 59714
(406)388-0827 [home]
(406)994-3931 [work]
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[CentOS-virt] Apparent discontinuity between advertised centos7 release 1803_01 and content of centos-release file

[mql]

Hello,

I searched centos7 in the AWS marketplace for the at-time-of-writing-latest 
centos7 image: 
https://aws.amazon.com/marketplace/pp/B00O7WM7QW?qid=1524138193326=0-1_=srh_res_product_title

I built a standard free tier t2.micro from this putative 1803_01 AMI.  I see 
from the docs, this is thus a March 2018 compilation.
When I get CLI, I get this:

[centos@ip-172-31-27-32 etc]$ cat centos-release
CentOS Linux release 7.4.1708 (Core)

which suggests that the AMI I just launched was built on a version of centos 
compiled from upstream sources in August 2017.  
Does the release of centos7 on the marketplace sport a release version which 
does not pertain to the machine's release? Unlike with releases published 
outside AWS, the Centos  cloud page does not 
specify version info as listed on AWS.

Thanks v much IA,

M







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Re: [CentOS] Down C6 ALL without torrent ?

[Valeri Galtsev]

On Wed, April 18, 2018 8:58 pm, Always Learning wrote:
>
> Hi Valeri,
>
>> > Is it possible to download C6 combined parts 1 and 2 not using Torrent
>> ?
>
>> Paul, you can go directly to the mirror server I maintain, it allows
>> direct download of DVD images:
>>
>> http://bay.uchicago.edu/centos
>
> I looked, but could not find a non-Torrent option for C6 combined parts
> 1 and 2 ..
>
> Index of /centos/6.9/isos/x86_64
>   * Parent Directory
>   * 0_README.txt
>   * CentOS-6.9-x86_64-LiveDVD.iso
>   * CentOS-6.9-x86_64-LiveDVD.torrent
>   * CentOS-6.9-x86_64-bin-DVD1.iso
>   * CentOS-6.9-x86_64-bin-DVD1to2.torrent
>   * CentOS-6.9-x86_64-bin-DVD2.iso
>   * CentOS-6.9-x86_64-minimal.iso
>   * CentOS-6.9-x86_64-minimal.torrent
>   * CentOS-6.9-x86_64-netinstall.iso
>   * CentOS-6.9-x86_64-netinstall.torrent
>   * README.txt
>   * md5sum.txt
>   * md5sum.txt.asc
>   * sha1sum.txt
>   * sha1sum.txt.asc
>   * sha256sum.txt
>   * sha256sum.txt.asc
>
>
> I sought: CentOS-6.9-x86_64-bin-DVD1to2.iso

Aha, now I understand what you want. It probably doesn't exist on master
repository server. You can re-master DVD from two of them or from a copy
of content of both in some directory on hard drive.

Thanks.
Valeri

>
> I suppose I could copy DVD1 to a USB stick and then DVD2 to another USB
> stick ?
>
> It would be nice to have everything (part 1 and part 2) on the same
> bootable USB stick.
>
>
> Thank you.
>
>
> --
> Regards,
>
> Paul.
> England, EU.  England's place is in the European Union.
>
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>



Valeri Galtsev
Sr System Administrator
Department of Astronomy and Astrophysics
Kavli Institute for Cosmological Physics
University of Chicago
Phone: 773-702-4247

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Re: [CentOS] tftpd server S not responding

[Jonathan Billings]

On Wed, Apr 18, 2018 at 08:52:32PM -0400, Asif Iqbal wrote:
> I tested with firewalld turned off and selinux all permissive. I also did
> not see any denied in audit log
> related to this when selinux was enforced

Have you checked the *client* firewall?  TFTP responses to client
requests are blocked by the default firewall, due to the nature of the
TFTP protocol.

-- 
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Re: [CentOS] Enterprise company using CentOS

[Sorin Srbu]

> -Original Message-
> From: CentOS  On Behalf Of Leon Fauster
> Sent: den 19 april 2018 11:46
> To: CentOS mailing list 
> Subject: Re: [CentOS] Enterprise company using CentOS
> 
> Am 19.04.2018 um 10:42 schrieb Mats Bennsäter
> :
> >
> > We have systems that is business critical and therefor need support.
> 
> One requirement that is addressed by having a RHEL subscription.
> 
> 
> > Instead of having two different brands a solution could be to have
> everything
> > on CentOS and sign up support for those that are business critical instead 
> > of
> > managing both RHEL and CentOS.
> 
> Another reason to stay with RHEL.
> 
> Sure, having everything on CentOS with 3rd party support would
> address your requirements, but equally? The 3rd party would also
> try to get support from RH. I would compare the qualities of such
> support and mapping it with my needs.

Spot on.

The way we did it when we let go of RHEL for server and desktop, was we eased 
into it or out of, whatever your POV.

Critical servers remained on RHEL for quite a while. Servers got CentOS when 
the entitlement ran out. 

Desktops got CentOS whenever they were available for a reinstall over a quarter 
of a year IIRC.

Five or so years later were a CentOS shop completely. With the odd Ubuntu 
desktop.
Majority of desktops are however Windows boxes, but that's a different matter.

Might that be a solution for you too Mats, ie ease into it - keep RHEL on 
critical servers and replace for CentOS on those that aren't?



--
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Re: [CentOS] Down C6 ALL without torrent ?

[John Hodrien]

On Thu, 19 Apr 2018, Always Learning wrote:


On Thu, 2018-04-19 at 09:40 +0100, John Hodrien wrote:


On Wed, April 18, 2018 8:36 pm, Always Learning wrote:



I have an aversion to using anything that comes from unknown sources, as
used by Torrent.



Can we also challenge this "torrents are untrustworthy" attitude.


Having, successfully so far, resisted/repelled several devious attacks from
the Russians, I am keen to maintain a clean, and thus secure, system as
possible.


You can be given an ISO from a shady character under a railway bridge,


I'd throw it away unused. Do not want the associated risks.


This is where you're making a mistake.  If you're verifying checksums, you're
not taking an additional risk, beyond the risk of a hash collision.  If you're
worried about sha256 hash collisions, I think you're worrying about the wrong
things.

The important bit is getting the hash from a secure source, and bothering the
check it.

jh
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Re: [CentOS] Enterprise company using CentOS

[Mats Bennsäter]

Agree. On paper the support from a company like Rogue Wave look quite good
but
I need recommendations and hopefully a contact to someone that have
practical experience
from a larger organization.

//mats



2018-04-19 11:45 GMT+02:00 Leon Fauster :

> Am 19.04.2018 um 10:42 schrieb Mats Bennsäter :
> >
> > We have systems that is business critical and therefor need support.
>
> One requirement that is addressed by having a RHEL subscription.
>
>
> > Instead of having two different brands a solution could be to have
> everything
> > on CentOS and sign up support for those that are business critical
> instead of
> > managing both RHEL and CentOS.
>
> Another reason to stay with RHEL.
>
> Sure, having everything on CentOS with 3rd party support would
> address your requirements, but equally? The 3rd party would also
> try to get support from RH. I would compare the qualities of such
> support and mapping it with my needs.
>
> --
> LF
>
>
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Re: [CentOS] Enterprise company using CentOS

[Leon Fauster]

Am 19.04.2018 um 10:42 schrieb Mats Bennsäter :
> 
> We have systems that is business critical and therefor need support.

One requirement that is addressed by having a RHEL subscription.


> Instead of having two different brands a solution could be to have everything
> on CentOS and sign up support for those that are business critical instead of
> managing both RHEL and CentOS.

Another reason to stay with RHEL. 

Sure, having everything on CentOS with 3rd party support would 
address your requirements, but equally? The 3rd party would also
try to get support from RH. I would compare the qualities of such 
support and mapping it with my needs.

--
LF


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Re: [CentOS] Down C6 ALL without torrent ?

[Always Learning]

On Thu, 2018-04-19 at 09:40 +0100, John Hodrien wrote:

> > On Wed, April 18, 2018 8:36 pm, Always Learning wrote:

> >> I have an aversion to using anything that comes from unknown sources, as
> >> used by Torrent.

> Can we also challenge this "torrents are untrustworthy" attitude.

Having, successfully so far, resisted/repelled several devious attacks
from the Russians, I am keen to maintain a clean, and thus secure,
system as possible.

> You can be given an ISO from a shady character under a railway bridge,

I'd throw it away unused. Do not want the associated risks.

> Also, why not just make your life easy and do a netinstall?

That's a good idea. Never done one of them before. I can put C6 on a CD
and a USB and boot from either.

>  That way you
> don't have to try to do anything you're not comfortable with.

Comfort-ability is not my criteria. The BIOS is supposed to be 4 or 5
years old. It won't boot from DVDs, yet it will boot from zip disks and
other historic relics (LH120, I think one of the other choices was).

Have a nice day.

Thank you.


-- 
Regards,

Paul.
England, EU.  England's place is in the European Union.

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Re: [CentOS] Enterprise company using CentOS

[Mats Bennsäter]

Hi

We have systems that is business critical and therefor need support.
Instead of having two different brands a solution could be to have
everything
on CentOS and sign up support for those that are business critical instead
of
managing both RHEL and CentOS.

//mats


2018-04-19 10:28 GMT+02:00 Pete Biggs :

>
> > We are about to create a business case for migrate RHEL to CentOS for
> all or
> > a subset of our RHEL holdings. I have two questions that I hope to get
> help
> > answering.
> >
> > 2. Suggestion/recommendation of vendors that can provide support for
> CentOs.
> >
> Forgive me if I'm being a bit naive, but surely the point of CentOS is
> that it is the option for those who do not wish to buy support. If you
> want to buy support for your enterprise Linux, use RedHat; if you want
> to do it yourself and use community support, then use CentOS (or one of
> the other clones).
>
> So, why do you want to pay someone other than RH for the support of
> RHEL?
>
> P.
>
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Re: [CentOS] Down C6 ALL without torrent ?

[John Hodrien]

On Thu, 19 Apr 2018, Valeri Galtsev wrote:


On Wed, April 18, 2018 8:36 pm, Always Learning wrote:

Hi,

I have a machine with a BIOS that does not permit DVD installation. It
accepts everything else including some old superseded media types.

Is it possible to download C6 combined parts 1 and 2 not using Torrent ?

I have an aversion to using anything that comes from unknown sources, as
used by Torrent.


Paul, you can go directly to the mirror server I maintain, it allows
direct download of DVD images:

http://bay.uchicago.edu/centos

You may prefer mirror geographically closer to you.


Can we also challenge this "torrents are untrustworthy" attitude.

You can be given an ISO from a shady character under a railway bridge, and as
long as the ISO matches the checksums you can source directly from the CentOS
https site (https://wiki.centos.org/Manuals/ReleaseNotes/CentOS7), it's as
good as any other copy that's ever been in existence.

Why is a torrent source any worse than a copy off any of the official mirrors?

Also, why not just make your life easy and do a netinstall?  That way you
don't have to try to do anything you're not comfortable with.

jh
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Re: [CentOS] Enterprise company using CentOS

[Pete Biggs]

> We are about to create a business case for migrate RHEL to CentOS for all or
> a subset of our RHEL holdings. I have two questions that I hope to get help
> answering.
> 
> 2. Suggestion/recommendation of vendors that can provide support for CentOs.
> 
Forgive me if I'm being a bit naive, but surely the point of CentOS is
that it is the option for those who do not wish to buy support. If you
want to buy support for your enterprise Linux, use RedHat; if you want
to do it yourself and use community support, then use CentOS (or one of
the other clones).

So, why do you want to pay someone other than RH for the support of
RHEL?

P.

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[CentOS] Enterprise company using CentOS

[Mats Bennsäter]

Hi all

We are about to create a business case for migrate RHEL to CentOS for all or
a subset of our RHEL holdings. I have two questions that I hope to get help
answering.
1. I want to get in touch with a company that have done this journey on an
Enterprise company.
2. Suggestion/recommendation of vendors that can provide support for CentOs.

Scop:
North Europe
Number of RHEL +8.000
Support 24x7

Thanks
//mats
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Re: [CentOS] tftpd server S not responding

[Pete Biggs]

On Wed, 2018-04-18 at 20:52 -0400, Asif Iqbal wrote:
> On Thu, Apr 12, 2018 at 9:26 AM, Steven Tardy  wrote:
> 
> > Reading back through prior emails. . . TFTP client requests packets *are*
> > making it to the TFTP server. So it seems like something on the TFTP server
> > itself.
> > 
> 
> Right. I am not sure how to debug that

Just reading back through the thread, I'm still not sure, but does the
server have multiple ethernet interfaces? If so, can you turn off the
others temporarily?

Is it possible that IPv6 is getting in the way?

If you do

   lsof -i :69

what do you get?

> 
> 
> > 
> > Like previously mentioned server side
> > firewall/iptables/tcp-wrappers/selinux are all possible culprits.
> > 
> > 
> 
> I tested with firewalld turned off and selinux all permissive. I also did
> not see any denied in audit log
> related to this when selinux was enforced
> 
> 
> 
> > Hmmm just thought of something else, what are the file permissions of the
> > file you are requesting? Try `chmod a+r filename`?
> > 
> 
> Yes it is readable.
> 
What about all the directories above the file - are they readable and
searchable?

P.
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Re: [CentOS] Down C6 ALL without torrent ?

[Tom Grace]

On 19/04/2018 02:58, Always Learning wrote:
> 
> I sought: CentOS-6.9-x86_64-bin-DVD1to2.iso

The torrent contains two ISOs - DVD1 and DVD2, so you would still need
to merge them.

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