Re: [CentOS] open source network diagnostic tools

[Tate Belden]

Personally, I'd start with Wireshark see what's happening now. Then setup
Nagios for longer term
https://www.nagios.org/

On Sat, Jun 11, 2022 at 4:14 AM lejeczek via CentOS 
wrote:

>
>
> On 08/06/2022 20:19, Christopher Wensink wrote:
> > Everyone,
> >
> > From time to time on our network we experience a pause
> > where it seems like everything just hesitates for a time,
> > this could be 2-10 seconds, then communications resume and
> > everything is normal again.
> >
> > I suspect that there one machine that is occasionally
> > sending out bad packets or is flooding the network when it
> > shouldn't, but I don't know for sure.  I've tried scanning
> > with angry ip scanner to confirm IP addresses are set and
> > communicating as documented. I've tried running captures
> > with wireshark to try to identify one culprit but nothing
> > is sticking out.
> >
> > I've tried tcpdump to see if something obvious is placed
> > there, but it's a flood of information and it's difficult
> > to tell what (if anything) is a problem and what is not.
> >
> > I'm also working on setting up icinga for monitoring all
> > servers to see if that provides insight.
> >
> > What other tools / tactics would you use to identify the
> > core cause of these kinds of intermittent pauses?
> >
> > Chris
> >
> Though I can not recommend any specific tools, a learning
> curve should be easy peasy, including tools/solution -
> unless you already looked into it & have it covered - in old
> days with Windowze NIC faulty drivers, OS own issues or
> intentionally provoked network stack misbehavior would/could
> put a device/NIC in the 'promiscuous' mode which would
> results in network "acts" in ways you describe.
>
> good luck, L.
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-- 
Tate Belden

*NOTE: k...@casperarc.net  has been depreciated, please
use this address instead: wyo...@gmail.com *

"The Dungeon <http://ka7o.net>"

"We do not become enlightened by imagining figures of light, but by making
the darkness conscious."
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Re: [CentOS] USB-serial adapter for CentOS 7

[Tate Belden]

I've several USB <-> RS-232 dongles around. As well as a few embedded
devices. They all "Just Work (tm)" on Redhat, CentOS, Fedora, Debian,
Raspian and Kali.

Knock on wood - never had a problem using any of them. As the drivers are
part of the kernel, I'd expect any distro using a recent kernel to do well.

On Wed, Jul 8, 2020 at 9:24 AM Leroy Tennison 
wrote:

> I've used one on a Linux laptop, it "just worked" but the OS wasn't CentOS
> 7.
>
> 
> From: CentOS  on behalf of H <
> age...@meddatainc.com>
> Sent: Wednesday, July 8, 2020 10:13 AM
> To: Centos Mailing List 
> Subject: [EXTERNAL] [CentOS] USB-serial adapter for CentOS 7
>
> CAUTION: This email originated from outside of the organization. Do not
> click links or open attachments unless you recognize the sender and know
> the content is safe.
>
>
> I need to connect an older APS UPS unit to a machine running CentOS 7.
> Unfortunately the UPS only has a serial port whereas the computer does not.
> I am aware that there are USB-serial adapters but that the hardware or the
> drivers might fall short of expectations.
>
> Does anyone have positive experience with such an adapter? Or, conversely,
> would recommend avoid a particular adapter?
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>
> Leroy Tennison
> Network Information/Cyber Security Specialist
> E: le...@datavoiceint.com
>
>
>
> [cid:Data-Voice-International-LOGO_aa3d1c6e-5cfb-451f-ba2c-af8059e69609.PNG]
>
>
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> 75070
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>
>
> This message has been sent on behalf of a company that is part of the
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> If you prefer not to be contacted by Harris Operating Group please notify
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>
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-- 
Tate Belden
"The Dungeon <http://ka7o.net>"

We are dreamers, shapers, singers and makers. We study the mysteries of
laser and circuit, crystal and scanner, holographic demons and invocations
of equations. These are the tools we employ, and we know many things.
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Re: [CentOS] FAX

[Tate Belden]

https://www.hylafax.org/

On Sun, May 10, 2020 at 10:36 PM Mark LaPierre  wrote:

> Hey All,
>
> Has anyone out there figured out how to send a FAX from a computer, sans
> FAX machine?
>
> --
>  _
> °v°
>/(_)\
> ^ ^  Mark LaPierre
> Registered Linux user No #267004
> https://linuxcounter.net/
> 
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-- 
Tate Belden
"The Dungeon <http://ka7o.net>"

We are dreamers, shapers, singers and makers. We study the mysteries of
laser and circuit, crystal and scanner, holographic demons and invocations
of equations. These are the tools we employ, and we know many things.
--Elric
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Re: [CentOS] systemd-sleep

[Tate Belden]

https://www.freedesktop.org/software/systemd/man/systemd-sleep.conf.html

On Mon, Jun 17, 2019 at 9:44 AM mark  wrote:

> I found that one of my users' workstation is, for some reason, running
> systemd-sleep. I cannot find, anywhere on the system. system-sleep.conf
> (or systemd-sleep.conf), nor do I find systemctl status system[d]-sleep.
>
> How can I turn this thing off, other than renaming
> /usr/lib/systemd/systemd-sleep?
>
>  mark
>
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-- 
Tate Belden
"The Dungeon <http://ka7o.net>"

We are dreamers, shapers, singers and makers. We study the mysteries of
laser and circuit, crystal and scanner, holographic demons and invocations
of equations. These are the tools we employ, and we know many things.
--Elric
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Re: [CentOS] CentOS 8 Coming When???

[Tate Belden]

And the answer is same as the last X times this has been asked.

When it's ready.

However, they do have a page up so you can track said 'readiness'. It may
lends some info.

https://wiki.centos.org/About/Building_8

On Fri, Jun 7, 2019 at 3:57 PM Eugene Poole  wrote:

> The subject says it all.
>
> --
> Eugene Poole
> Woodstock, Georgia
>
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-- 
Tate Belden
"The Dungeon <http://ka7o.net>"

We are dreamers, shapers, singers and makers. We study the mysteries of
laser and circuit, crystal and scanner, holographic demons and invocations
of equations. These are the tools we employ, and we know many things.
--Elric
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Re: [CentOS] Now that Red Hat Enterprise Linux 8.0 has been released...

[Tate Belden]

>From the CentOS web site. A "Rough Status" page of the process and
milestones of getting CentOS 8 ready.

Nicely done guys and thanks!

https://wiki.centos.org/About/Building_8

On Fri, May 10, 2019 at 2:58 AM Turritopsis Dohrnii Teo En Ming <
c...@teo-en-ming-corp.com> wrote:

> Noted with thanks.
>
> 
> From: CentOS  on behalf of Phil Wyett <
> philwy...@kathenas.org>
> Sent: Friday, May 10, 2019 1:56 PM
> To: centos@centos.org
> Subject: Re: [CentOS] Now that Red Hat Enterprise Linux 8.0 has been
> released...
>
> On Fri, 2019-05-10 at 05:46 +, Turritopsis Dohrnii Teo En Ming
> wrote:
> > Good afternoon from Singapore,
> >
> >
> > When will CentOS 8.0 be released?
> >
> >
> > Thank you.
> >
> >
> > -BEGIN EMAIL SIGNATURE-
> >
> > The Gospel for all Targeted Individuals (TIs):
> >
> > [The New York Times] Microwave Weapons Are Prime Suspect in Ills of
> > U.S. Embassy Workers
> >
> > Link:
> >
> https://www.nytimes.com/2018/09/01/science/sonic-attack-cuba-microwave.html
>
> >
> > *
> > ***
> >
> >
> > Singaporean Mr. Turritopsis Dohrnii Teo En Ming's Academic
> > Qualifications as at 14 Feb 2019
> >
> > [1] https://tdtemcerts.wordpress.com/
> >
> > [2] https://tdtemcerts.blogspot.sg/
> >
> > [3] https://www.scribd.com/user/270125049/Teo-En-Ming
> >
> > -END EMAIL SIGNATURE-
> >
> > ___
> > CentOS mailing list
> > CentOS@centos.org
> > https://lists.centos.org/mailman/listinfo/centos
>
> Hi,
>
> It will be released when it is released. ;-)
>
> For info on CentOS 8, see:
>
> https://wiki.centos.org/About/Building_8
>
> Regards
>
> Phil
>
> --
> *** Playing the game for the games sake. ***
>
> IRC: kathenas
> Twitter: kathenasorg
> Website: https://kathenas.org
>
>
> -BEGIN EMAIL SIGNATURE-
>
> The Gospel for all Targeted Individuals (TIs):
>
> [The New York Times] Microwave Weapons Are Prime Suspect in Ills of
> U.S. Embassy Workers
>
> Link:
> https://www.nytimes.com/2018/09/01/science/sonic-attack-cuba-microwave.html
>
>
> 
>
>
> Singaporean Mr. Turritopsis Dohrnii Teo En Ming's Academic
> Qualifications as at 14 Feb 2019
>
> [1] https://tdtemcerts.wordpress.com/
>
> [2] https://tdtemcerts.blogspot.sg/
>
> [3] https://www.scribd.com/user/270125049/Teo-En-Ming
>
> -END EMAIL SIGNATURE-
>
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-- 
Tate Belden
"The Dungeon <http://ka7o.net>"

We are dreamers, shapers, singers and makers. We study the mysteries of
laser and circuit, crystal and scanner, holographic demons and invocations
of equations. These are the tools we employ, and we know many things.
--Elric
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Re: [CentOS] Question about updates

[Tate Belden]

One can also do the 'yum-cron' dance to automate updates.
Good writeup and description here:

https://www.howtoforge.com/tutorial/how-to-setup-automatic-security-updates-on-centos-7/

On Fri, Feb 15, 2019 at 11:37 PM Rob Kampen 
wrote:

> On 16/02/19 6:59 PM, Ralf Prengel wrote:
> > Hallo,
> > as a beginner using centos I‘ve a question about updates.
> > What it the right repo for getting all security and other updates?
> >
> http://mirror.eu.oneandone.net/linux/distributions/centos/7.6.1810/updates/
> > for example?
>
> If you have installed CentOS 7 it should have everything in place for
> regular updates.
>
> You simply need to invoke "sudo yum update" on a regular basis to ensure
> all the available updates are installed. Yum and rpm take care of
> sorting out where to check and apply updates from.
>
> HTH.
>
> >
> > Thanks
> > Ralf
> >
> >
> > ___
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-- 
Tate Belden
"The Dungeon <http://ka7o.net>"
A place of (solder) smoke, weird (server) sounds and (LED) blinky lights.
More than a few bugs of various flavors, too.

Natrona County Beekeepers <http://ncbees.org>
Casper Amateur Radio Club <http://casperarc.net>

“Any sufficiently advanced alien life is indistinguishable from God”  to
those that don't understand.  -- Cpt. C. Pike
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Re: [CentOS] Geany 1.34

[Tate Belden]

FWIW, on Fedora 29, I'm running Geany 1.34.1 and didn't have to enable
anything other than the default repositories. So, it'd appear to at least
be in the stream.

geany-1.34.1-2.fc29.x86_64

On Thu, Feb 14, 2019 at 8:53 AM H  wrote:

> On 01/04/2019 04:17 AM, H wrote:
> > Does anyone know if Geany 1.34 is headed to one of the repositories? I
> am running version 1.31 and interested in the 1.33+ since the markdown
> plugin has apparently been updated.
> >
> I raised this issue on the bugtracker for Fedora EPEL several weeks ago
> but have not seen any response. What can I do to raise this issue?
>
> Appreciate suggestions.
>
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-- 
Tate Belden
"The Dungeon <http://ka7o.net>"
A place of (solder) smoke, weird (server) sounds and (LED) blinky lights.
More than a few bugs of various flavors, too.

Natrona County Beekeepers <http://ncbees.org>
Casper Amateur Radio Club <http://casperarc.net>

“Any sufficiently advanced alien life is indistinguishable from God”  to
those that don't understand.  -- Cpt. C. Pike
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Re: [CentOS] Forums down?

[Tate Belden]

I can log in and view the forums just fine.

But yea, using your search link, I get that same 'server busy'
Informational.

Man, looks like it's been awhile since I've visited there.

On Mon, Feb 11, 2019 at 11:20 AM J Martin Rushton via CentOS <
centos@centos.org> wrote:

> All day I've been getting "Sorry but you cannot use search at this time.
> The server has high load. Please try again later." from
> https://www.centos.org/forums/search.php?search_id=unreadposts
>
> Is there a problem?
>
> --
> J Martin Rushton MBCS
>
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-- 
Tate Belden
"The Dungeon <http://ka7o.net>"
A place of (solder) smoke, weird (server) sounds and (LED) blinky lights.
More than a few bugs of various flavors, too.

Natrona County Beekeepers <http://ncbees.org>
Casper Amateur Radio Club <http://casperarc.net>

“Any sufficiently advanced alien life is indistinguishable from God”  to
those that don't understand.  -- Cpt. C. Pike
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Re: [CentOS] Bastion server

[Tate Belden]

Sorry Ilyass, But linking to a page of sales-speak isn't going to help.
That page doesn't share what, exactly, Wallix does or how it does it.

Can you provide detail on protocols, methods or even clarify goals, actions
or effects?

On Sun, Dec 2, 2018 at 12:34 PM Ilyass Kaouam  wrote:

> Hi,
> Thank you for your reply
> Chère mort détails About wallix
>
> https://www.wallix.com/en/
>
> Cdt
>
>
> Ilyass KAOUAM
> SysAdmin
>
> Le dim. 2 déc. 2018 à 18:44, Gordon Messmer  a
> écrit :
>
> > On 12/1/18 3:00 PM, Ilyass Kaouam wrote:
> > > Please can you give me an equivalent off Wallix but open source?
> >
> >
> > I didn't find a detailed description of what "Wallix" provides during a
> > cursory search.  You might get better responses by providing more detail
> > about what you're looking for.
> >
> >
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-- 
Tate Belden
"The Dungeon <http://ka7o.net>"
A place of (solder) smoke, weird (server) sounds and (LED) blinky lights.
More than a few bugs of various flavors, too.

Natrona County Beekeepers <http://ncbees.org>
Casper Amateur Radio Club <http://casperarc.net>

“You know what the issue is with this world? Everyone wants some magical
solution to their problem and everyone refuses to believe in magic.” ― Lewis
Carroll
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Re: [CentOS] Allowing non-root users to reboot a workstation

[Tate Belden]

Personally, this is what I'd use sudo for.

You can configure sudo to allow only certain commands with or without a
password. Not a lot of detail, but you can either require or skip the
password. And, instead of individuals - you can use groups. If you look
through the soders file, you'll see how it's doen.

This very brief article goes into a limited how-to:

http://www.atrixnet.com/allow-an-unprivileged-user-to-run-a-certain-command-with-sudo/

On Fri, Feb 2, 2018 at 9:09 AM, Felipe Westfields <
felipe.westfie...@gmail.com> wrote:

> I would like to be able to allow regular users that don't have admin
> privileges to be able to reboot their workstation. (they're software
> developers so rebooting their workstation doesn't affect anybody else)
>
> I tried changing the ownership of /sbin/reboot and /sbin/shutdown to
> root:users and permissions to 550, but that didn't work - it's still asking
> for root privileges.
>
> Possibly the problem might be that there's centralized LDAP authentication,
> not local, so the changes I made only apply to local accounts?
>
> Any suggestions?
>
> FW
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Re: [CentOS] yum install does not downgrade

[Tate Belden]

Use the 'downgrade' option.

https://access.redhat.com/solutions/29617

On Thu, Jun 1, 2017 at 1:46 PM, Anand Buddhdev  wrote:

> We're using ansible to configure our CentOS 6 servers, and we have a
> task to install a specific version of a package:
>
> - name: install thrift2
>   yum: name=ripencc-thrift2-{{ version }}
>
> In this ansible task, the "version" variable is set by the operator.
> When we want to upgrade, it works. But today we had to downgrade, and
> noticed that ansible wasn't downgrading it. So we tried by hand (the
> installed version was 1.0.8):
>
> # yum install ripencc-thrift2-1.0.3
>
> I don't have the output handy, because a colleague was working on it,
> but basically, yum said something like "package already installed" and
> refused to downgrade it, even though the package is in our repository.
>
> I have a strong sense that yum _used to_ downgrade packages if asked to
> install an older version, but perhaps I am misremembering.
>
> Nevertheless, I want to ask: is this a bug in yum? If asked to install a
> specific version, should it not upgrade OR downgrade as needed?
>
> Regards,
> Anand
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Re: [CentOS] System Time Source

[Tate Belden]

Warren, one slight correction on an other wise nicely written bit of info:

The time transmitted from WWV is not Mountain Time. Even though the WWV
transmitter farm is located in the Mountain time zone, the signals are
transmitted as "Coordinated Universal time", UTC, or 'Zulu' time.

Here, you can listen to a recording made at the transmitter site for the
5Mhz signal:
https://ia802605.us.archive.org/24/items/WWV5MHz/WWV-5MHz.MP3

On Wed, May 24, 2017 at 8:36 AM, Warren Young  wrote:

> On May 24, 2017, at 7:53 AM, Chris Olson  wrote:
> >
> > One of our STEM interns recently observed that there are
> > inexpensive clocks that sync via radio to standard time
> > services.
>
> There are two major types:
>
> 1. WWVB and its equivalents in other countries:
>
> https://en.wikipedia.org/wiki/WWVB
>
> 2. GPS clocks.
>
>
> WWVB has several problems:
>
> a. It’s transmitting from a fixed location in a time zone you probably
> aren’t in — US Mountain — being the least populous of the lower 48’s four
> time zones.  You therefore have to configure time zone offset and DST
> rules, which means additional software if you want it to track changes to
> these things.  There were 10 batches of such changes last year!
>
> https://mm.icann.org/pipermail/tz-announce/2016-November/thread.html
>
> b. It’s a weak signal.  Unless you’ve got a big antenna or are positioning
> the receiving device near a window, you probably can’t receive the WWVB
> signal reliably.
>
> c. Computers have major RFI shielding problems, which is why they’re
> typically placed in metal boxes.  (Even plastic-cased laptops have metal
> boxes inside.)  That means you have to have an external antenna even in the
> best case.  Now apply what you know about Wifi reliability to the problem
> of receiving a signal from a different *time zone*.
>
> I happen to be in the Mountain time zone, and it doesn’t take too much to
> shield our WWVB clocks from the signal.  I can only imagine how much easier
> it is out on the coasts.
>
>
> GPS time is a much better solution, but it’s power-hungry, as you probably
> know from running GPS on your smartphone.  This rules it out for laptops.
>
> The GPS transmitters probably have a higher received signal strength than
> WWVB, but cinderblock walls and grids of 42U equipment racks block the GPS
> signal quite well.  This is why data centers with such clocks generally
> have to run an antenna to the outside for their clock.  That makes it far
> more expensive than just connecting to an upstream NTP server.
>
> > When I was a student, such questions would have earned me
> > extra homework assignments.
>
> So do I get an “A”? :)
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Re: [CentOS] C 7.3 sshd will not reload

[Tate Belden]

Oh yea!

That's how I test/implement new configurations.

Make a change
restart
test
make a change
Lather, rinse and repeat

On Thu, Mar 2, 2017 at 6:26 PM, <m...@tdiehl.org> wrote:

> On Thu, 2 Mar 2017, Tate Belden wrote:
>
> I have to assume it's something unique to your install, then.
>>
>> I run about a dozen sshd instances on as many CentOS 7 boxes around here.
>> To a one, systemctl restart sshd is all it takes to implement config
>> changes.
>>
>
> Did you actually change something before doing the restart? If nothing
> changes
> it will restart every time. If I change the configuration to for instance
> have
> sshd listen on another port, that is when I have the problem. Oh and
> selinux is
> in permissive.
>
> There is nothing special about the environment. a couple of VM's in
> question
> are brand new minimal installs. I spin them up for testing push new sshd
> configs
> to them with Ansible and tear them down.
>
> Before someone says Ansible is the problem I have tried this by hand also.
>
>
> Regards,
>
> --
> Tom m...@tdiehl.org   Spamtrap address
>   me...@tdiehl.org
>
>
>> On Thu, Mar 2, 2017 at 11:50 AM, <m...@tdiehl.org> wrote:
>>
>> Hi,
>>>
>>> On Thu, 2 Mar 2017, Tate Belden wrote:
>>>
>>> Might I suggest using "systemctl restart sshd", instead of reload? At the
>>>
>>>> least - see if it behaves differently for you.
>>>>
>>>>
>>> restart, reload, stop then start all produce the same results.
>>>
>>> If I do not change the configuration, and just issue the restart, reload,
>>> etc.
>>> then it behaves as expected. Obviously that is not useful when you have
>>> configuration changes.
>>>
>>> I tested this on a couple of other VM's and get the same results.
>>>
>>
> --
> Tom m...@tdiehl.org   Spamtrap address
>   me...@tdiehl.org
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Re: [CentOS] C 7.3 sshd will not reload

[Tate Belden]

I have to assume it's something unique to your install, then.

I run about a dozen sshd instances on as many CentOS 7 boxes around here.
To a one, systemctl restart sshd is all it takes to implement config
changes.

Only time it's given me fits is if I forget to actually write the config
file in VIM. That pesky w gets me on rare occasion.

On Thu, Mar 2, 2017 at 11:50 AM, <m...@tdiehl.org> wrote:

> Hi,
>
> On Thu, 2 Mar 2017, Tate Belden wrote:
>
> Might I suggest using "systemctl restart sshd", instead of reload? At the
>> least - see if it behaves differently for you.
>>
>
> restart, reload, stop then start all produce the same results.
>
> If I do not change the configuration, and just issue the restart, reload,
> etc.
> then it behaves as expected. Obviously that is not useful when you have
> configuration changes.
>
> I tested this on a couple of other VM's and get the same results.
>
>
> Regards,
>
> --
> Tom m...@tdiehl.org   Spamtrap address
>   me...@tdiehl.org
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>



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Re: [CentOS] C 7.3 sshd will not reload

[Tate Belden]

Might I suggest using "systemctl restart sshd", instead of reload? At the
least - see if it behaves differently for you.


   - *restart* = stop + start
   - *reload* = remain running + re-read configuration files.


On Thu, Mar 2, 2017 at 9:29 AM,  wrote:

> Hi,
>
> Since upgrading to 7.3 I am having a problem getting sshd to reload after
> configuration changes. When I issue the command "systemctl reload
> sshd.service"
>
> I get the following error: "Unit sshd.service cannot be reloaded because
> it is inactive."
>
> It is obviously still running because I am connected over ssh to the
> machine and netstat
> shows it is listening.
> (vnewman pts3) # netstat -tulpn | grep ssh
> tcp0  0 0.0.0.0:22  0.0.0.0:*
>  LISTEN  29249/sshd
> tcp0  0 127.0.0.1:6010  0.0.0.0:*
>  LISTEN  3012/sshd: root@pts
> (vnewman pts3) #
>
> If I reboot the machine, then everything is OK.
>
> Has anyone seen this behavior or more importantly know how to fix it?
>
> Regards,
>
> --
> Tom m...@tdiehl.org   Spamtrap address
>   me...@tdiehl.org
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>



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