Re: [CentOS] NOT Solved - Re: SELinux policy to allow Dovecot to connect to Mysql

[Robert Moskowitz]

On 04/28/2017 06:36 PM, Gordon Messmer wrote:

On 04/28/2017 12:06 AM, Robert Moskowitz wrote:


Here are the messages I got:

type=AVC msg=audit(1493361695.041:49205): avc:  denied  { rlimitinh } 
for  pid=3047 comm="cleanup" 
scontext=system_u:system_r:postfix_master_t:s0 
tcontext=system_u:system_r:postfix_cleanup_t:s0 tclass=process 
permissive=1



My advice would be to slow down, and solve one problem at a time.


I failed to look at the content of these messages and see that there was 
also a problem with postfix accessing mysql.  I was not getting any 
errors about this in maillog.



We were talking about testing dovecot, and now you're testing postfix.


I would have to think a bit about how to test dovecot accessing mysql 
without it processing an email handed off to it by postfix.


  I know you need them both to work, but these are separate services, 
with their own individual policies.  If you're going to submit a bug 
report, you need to be able to specifically describe the problem and 
the solution.  You're not going to do that by mixing different 
services together.


Nope.  But I see now there is a broader problem.



sendmail -i test...@test.htt-consult.com < 
/usr/share/doc/amavisd-new-2.10.1/test-messages/README


It failed accessing mysql with the following maillog messages:


Yes, but the policy you added earlier only granted MySQL access to 
dovecot.  For postfix, you'll want to check for booleans first and 
then create a policy (without debugging AVCs) if no boolean exists, 
and then look at debugging AVCs if there are still issues (which is 
*almost* never the case).


So now I do some googling about postfix/mysql and SELinux.  Probably a 
better discussed combination.






When I get home Monday, I am going to rebuild the server.


That would be good.  Keep a log of *all* of the changes you make to 
the system, from the very beginning.  Once you resolve the problem, 
rebuild the server again and follow your log.



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Re: [CentOS] NOT Solved - Re: SELinux policy to allow Dovecot to connect to Mysql

[Robert Moskowitz]

On 04/28/2017 08:07 PM, m...@tdiehl.org wrote:

On Fri, 28 Apr 2017, Gordon Messmer wrote:


On 04/28/2017 12:06 AM, Robert Moskowitz wrote:


 Here are the messages I got:

 type=AVC msg=audit(1493361695.041:49205): avc:  denied  { rlimitinh 
} for

 pid=3047 comm="cleanup" scontext=system_u:system_r:postfix_master_t:s0
 tcontext=system_u:system_r:postfix_cleanup_t:s0 tclass=process
 permissive=1



My advice would be to slow down, and solve one problem at a time. We 
were talking about testing dovecot, and now you're testing postfix.  
I know you need them both to work, but these are separate services, 
with their own individual policies.  If you're going to submit a bug 
report, you need to be able to specifically describe the problem and 
the solution.  You're not going to do that by mixing different 
services together.



 sendmail -i test...@test.htt-consult.com <
 /usr/share/doc/amavisd-new-2.10.1/test-messages/README

 It failed accessing mysql with the following maillog messages:


Yes, but the policy you added earlier only granted MySQL access to 
dovecot. For postfix, you'll want to check for booleans first and 
then create a policy (without debugging AVCs) if no boolean exists, 
and then look at debugging AVCs if there are still issues (which is 
*almost* never the case).




 When I get home Monday, I am going to rebuild the server.


That would be good.  Keep a log of *all* of the changes you make to 
the system, from the very beginning.  Once you resolve the problem, 
rebuild the server again and follow your log.


+1 to what Gordon said. It is the only way you are going to figure it 
out.


You could use something like Ansible so that you can rebuild the 
server the
same way in about 20 minutes. Yes, it takes time to get Ansible or 
something
similar to work but once you do, you can build the same thing as many 
times

as you need and they are always the same.


I think I have rather good instructions with which I can build the 
server quickly:


http://medon.htt-consult.com/Centos7-mailserver.html

Though I am going to drop mailgraph.  At first, looking at another site 
using it, I was impressed.  But not anymore.  Plus the pages are in 
German, and I really can't do the translation.



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Re: [CentOS] SCSI drives and Centos 7

[John R Pierce]

On 4/29/2017 12:42 PM, Gregory P. Ennis wrote:

what does `lspci` have to say about this raid card ?

John,

Thanks for the prompt :

lspci demonstrates :

02:01.0 RAID bus controller: LSI Logic / Symbios Logic MegaRAID (rev 01)
02:02.0 SCSI storage controller: Adaptec AIC-7902B U320 (rev 10)
02:02.1 SCSI storage controller: Adaptec AIC-7902B U320 (rev 10)


could you try `lspci -nn`,  this will return the vendor/device ID, which 
will pin down which megaraid it is.


but, I'm afraid the answer is, that hardware is way over 10 years old, 
and support has been dropped from newer OS releases.   Those raid 
controllers require not only specific drivers, but also support 
utilities for monitoring the status of the raids, and configuring them.


The Megaraid family started back under NCR/Symbios in the late 80s, LSI 
acquired what was left of Symbios in 1998, Avago acquired LSI in 2014, 
then merged with Broadcom  in 2016 (as I understand it, Avago acquired 
Broadcom, but then renamed themselves). Sadly, support for legacy 
hardware tends to evaporate in corporate takeovers as its seen as pure 
overhead.




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Re: [CentOS] SCSI drives and Centos 7

[Gregory P. Ennis]

On 04/29/2017 06:50 AM, Gregory P. Ennis wrote:
> about 4 years ago, I tried to install CentOS 6 on a Supermicro server
> with SCSI drives using a LSI raid system.

Red Hat does discontinue support for some storage driver for very old 
hardware when they start a new release series.  For EL6, that list is here:

https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Migration_Planning_Guide/sect-Migration_Guide-Package_Changes-Driver_Changes.html#sect-packages-discontinued-drivers
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Migration_Planning_Guide/sect-packages-deprecated-drivers.html

For 7:

https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Migration_Planning_Guide/sect-Red_Hat_Enterprise_Linux-Migration_Planning_Guide-Removed_Drivers.html

I did a cursory check, and don't see any drivers that were removed in 6 
present in 7.

Run 'lsmod' on the system you're currently running and see if you can 
locate the storage driver.  I'm guessing it's "megaraid" which is not 
present in EL7.

Gordon,

Thank you for your help

You were right :

dm_message 36289  1 dm_raid45
dm_region_hash 46145  1 dm_raid45
dm_log 44993  3 dm_mirror,dm_raid45,dm_region_hash
dm_mod103313  4 dm_mirror,dm_multipath,dm_raid45,dm_log
dm_mem_cache   38977  1 dm_raid45
ahci   74317  0
ata_piix   57285  0
libata210769  2 ahci,ata_piix
aic79xx   202521  0
scsi_transport_spi 59841  1 aic79xx
shpchp 70637  0
megaraid_mbox  66001  5
sd_mod 56513  7
scsi_mod  202201  14 
be2iscsi,ib_iser,iscsi_tcp,bnx2i,libcxgbi,libiscsi2,scsi_transport_iscsi2,scsi_dh,sg,libata,aic79xx,scsi_transport_spi,megaraid_mbox,sd_mod
megaraid_mm44793  1 megaraid_mbox

Looks like it is time for an upgrade

Greg


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Re: [CentOS] SCSI drives and Centos 7

[Gregory P. Ennis]

-Original Message-From: John R Pierce 
Reply-to: CentOS mailing list 
To: centos@centos.org
Subject: Re: [CentOS] SCSI drives and Centos 7
Date: Sat, 29 Apr 2017 11:19:38 -0700

On 4/29/2017 10:49 AM, Gregory P. Ennis wrote:
> I am remote from the unit today, and do not have a good way to look at
> the board today, but the contents of /proc/scsi/scsi is :


what does `lspci` have to say about this raid card ?

John,

Thanks for the prompt :

lspci demonstrates :

02:01.0 RAID bus controller: LSI Logic / Symbios Logic MegaRAID (rev 01)
02:02.0 SCSI storage controller: Adaptec AIC-7902B U320 (rev 10)
02:02.1 SCSI storage controller: Adaptec AIC-7902B U320 (rev 10)

Greg


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Re: [CentOS] SCSI drives and Centos 7

[John R Pierce]

On 4/29/2017 6:50 AM, Gregory P. Ennis wrote:

about 4 years ago, I tried to install CentOS 6 on a Supermicro server
with SCSI drives using a LSI raid system.



I'm curious just how OLD this SCSI RAID system is?   Everything I've 
deployed in the last 8 or 10 year has been SAS based, parallel SCSI went 
the way of buggy whips some years back, I think the last parallel SCSI 
servers I decommissioned were based on the Pentium-4 generation of Intel 
Xeon processors, like Nocona..


the power vs performance of these old servers makes them a losing bet, 
especially now that you're way on the wrong side of the typical 5 year 
halflife of computer electronics.a single socket low end modern 
server would have many times the CPU and IO performance, and would be 
able to run many such workloads virtualized.




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Re: [CentOS] SCSI drives and Centos 7

[Gordon Messmer]

On 04/29/2017 06:50 AM, Gregory P. Ennis wrote:

about 4 years ago, I tried to install CentOS 6 on a Supermicro server
with SCSI drives using a LSI raid system.


Red Hat does discontinue support for some storage driver for very old 
hardware when they start a new release series.  For EL6, that list is here:


https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Migration_Planning_Guide/sect-Migration_Guide-Package_Changes-Driver_Changes.html#sect-packages-discontinued-drivers
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Migration_Planning_Guide/sect-packages-deprecated-drivers.html

For 7:

https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Migration_Planning_Guide/sect-Red_Hat_Enterprise_Linux-Migration_Planning_Guide-Removed_Drivers.html

I did a cursory check, and don't see any drivers that were removed in 6 
present in 7.


Run 'lsmod' on the system you're currently running and see if you can 
locate the storage driver.  I'm guessing it's "megaraid" which is not 
present in EL7.

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Re: [CentOS] SCSI drives and Centos 7

[John R Pierce]

On 4/29/2017 10:49 AM, Gregory P. Ennis wrote:

I am remote from the unit today, and do not have a good way to look at
the board today, but the contents of /proc/scsi/scsi is :



what does `lspci` have to say about this raid card ?


--
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Re: [CentOS] SCSI drives and Centos 7

[Gregory P. Ennis]

Date: Sat, 29 Apr 2017 10:17:55 -0400

> On Apr 29, 2017, at 9:50 AM, Gregory P. Ennis  wrote:
> 
> find a way to make the installation disc of Centos 6 identify the SCSI
> drives.

What model LSI card?
Is that card on the RHEL hardware support list?
Does LSI/Dell have drivers on their site?
Have you tried drivers from LSI/Dell and using the dd(driver disk) option 
during install?

Steven, thank you for your help.

I am remote from the unit today, and do not have a good way to look at
the board today, but the contents of /proc/scsi/scsi is :

> Host: scsi0 Channel: 00 Id: 08 Lun: 00
>   Vendor: SUPERModel: GEM359 REV001Rev: 1.09
>   Type:   ProcessorANSI SCSI revision: 02
> Host: scsi0 Channel: 02 Id: 00 Lun: 00
>   Vendor: MegaRAID Model: LD 0 RAID1  286G Rev: 1L51
>   Type:   Direct-AccessANSI SCSI revision: 02
> Host: scsi0 Channel: 02 Id: 01 Lun: 00
>   Vendor: MegaRAID Model: LD 1 RAID1  286G Rev: 1L51
>   Type:   Direct-AccessANSI SCSI revision: 02

and the contents of /proc/scsi/sg is 

> SUPER   GEM359 REV001   1.09
> MegaRAIDLD 0 RAID1  286G1L51
> MegaRAIDLD 1 RAID1  286G1L51
> 

I do not have a RedHat subscription, but do have an account.  When I did
a search on "GEM359" it was not found.

I have not been able to wade through the Broadcom web site to see if
they have any drivers for the LSI, but have not finished.  I was not
able to find anything when I tried to use Centos 6; I was hoping that
this was remedied for Centos 7

I have never used the dd option during an install, but am willing to
learn.

Greg




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Re: [CentOS] Getting to Mate or Xfce

[Jonathan Billings]

On Sat, Apr 29, 2017 at 03:43:02PM +, Beartooth wrote:
>   Related problem: when I become root and tell it "yum update," it 
> figures out a list of umpteen hundred rpms to update, but then runs 
> through attempts at mirrors and keeps failing till it runs out. It failed 
> to connect to my wireless router (or even to find it, afaict). So I 
> plugged it into the router with an ethernet cable. No joy.

This sounds like you have cached metadata that points to older files
that are no longer on the mirrors.

Try running 'yum clean metadata' and try updating again.

-- 
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Re: [CentOS] Getting to Mate or Xfce

[Pete Biggs]

On Sat, 2017-04-29 at 15:43 +, Beartooth wrote:
>   My wife bought a new Thinkpad, on which we had the shop install 
> CentOS 7 (I *think* it's 7.3.) Alas!, I didn't think to specify NOT Gnome, 
> in thunder. So of course I got it. 
> 
>   I've tried several times to force myself to accommodate Gnome3, 
> always with no joy. How do I get Mate or Xfce instead?

I hope this doesn't sound rude, it's not meant to, but have you googled
for it? The first hit on 'install xfce centos7' or 'install mate
centos7' gives the answers in much more detail than I can go into here.
But basically, install epel and then 

  yum groupinstall "Xfce"

or

  yum groupinstall "MATE Desktop"

> 
>   Related problem: when I become root and tell it "yum update," it 
> figures out a list of umpteen hundred rpms to update, but then runs 
> through attempts at mirrors and keeps failing till it runs out. It failed 
> to connect to my wireless router (or even to find it, afaict). So I 
> plugged it into the router with an ethernet cable. No joy.
> 

Do you have any net connection at all?  Can you see websites? If you
can't see the outside world, updates aren't going to happen.

P.
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Re: [CentOS] SCSI drives and Centos 7

[Lamar Owen]

On 04/29/2017 09:50 AM, Gregory P. Ennis wrote:

Has anyone used Centos 7 on SCSI drives,
or am I going to need to get an upgrade of the server?  The server is
working great.

I am, on IBM LS20 blades.  The SCSI controller, according to lspci, is:
02:02.0 SCSI storage controller: LSI Logic / Symbios Logic 53c1030 PCI-X 
Fusion-MPT Dual Ultra320 SCSI (rev 08)


I'm not using it in RAID mode.


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[CentOS] Getting to Mate or Xfce

[Beartooth]

My wife bought a new Thinkpad, on which we had the shop install 
CentOS 7 (I *think* it's 7.3.) Alas!, I didn't think to specify NOT Gnome, 
in thunder. So of course I got it. 

I've tried several times to force myself to accommodate Gnome3, 
always with no joy. How do I get Mate or Xfce instead?

Related problem: when I become root and tell it "yum update," it 
figures out a list of umpteen hundred rpms to update, but then runs 
through attempts at mirrors and keeps failing till it runs out. It failed 
to connect to my wireless router (or even to find it, afaict). So I 
plugged it into the router with an ethernet cable. No joy.

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Re: [CentOS] SCSI drives and Centos 7

[Pete Biggs]

On Sat, 2017-04-29 at 08:50 -0500, Gregory P. Ennis wrote:
> Everyone,
> 
> about 4 years ago, I tried to install CentOS 6 on a Supermicro server
> with SCSI drives using a LSI raid system.  I could never figure out or
> find a way to make the installation disc of Centos 6 identify the SCSI
> drives.  The installation disc for Centos 5 identified the SCSI drives
> without a problem. I finally gave up on Centos 6 and installed Centos 5
> and the system has worked very well for the last 4 years 
> 
> Now that Centos 5 has been retired, I would like to install Centos 7 on
> this server.  Does the install disc for Centos 7 have the same issues
> with SCSI drives as Centos 6?  Has anyone used Centos 7 on SCSI drives,
> or am I going to need to get an upgrade of the server?  The server is
> working great.
> 
I installed CentOS 7 on a machine with an LSI Ultra 320 SCSI card in it
and I don't remember having any problems. But there again, the OS on
that system is installed on a separate SAS MegaRAID drive and the SCSI
is just used for user files, so I never paid much attention to it
during install.

P.

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Re: [CentOS] SCSI drives and Centos 7

[Steven Tardy]

> On Apr 29, 2017, at 9:50 AM, Gregory P. Ennis  wrote:
> 
> find a way to make the installation disc of Centos 6 identify the SCSI
> drives.

What model LSI card?
Is that card on the RHEL hardware support list?
Does LSI/Dell have drivers on their site?
Have you tried drivers from LSI/Dell and using the dd(driver disk) option 
during install?
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[CentOS] SCSI drives and Centos 7

[Gregory P. Ennis]

Everyone,

about 4 years ago, I tried to install CentOS 6 on a Supermicro server
with SCSI drives using a LSI raid system.  I could never figure out or
find a way to make the installation disc of Centos 6 identify the SCSI
drives.  The installation disc for Centos 5 identified the SCSI drives
without a problem. I finally gave up on Centos 6 and installed Centos 5
and the system has worked very well for the last 4 years 

Now that Centos 5 has been retired, I would like to install Centos 7 on
this server.  Does the install disc for Centos 7 have the same issues
with SCSI drives as Centos 6?  Has anyone used Centos 7 on SCSI drives,
or am I going to need to get an upgrade of the server?  The server is
working great.

Greg Ennis

-- 
Gregory P. Ennis, M.D., M.R.O.
Medical Director
EcCare Health Centers
www.EcCare.com
972-659-1234 


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Re: [CentOS] Apache + SSL: default configuration rated "C" by Qualys Labs

[Walter H.]

On 26.04.2017 08:58, Nicolas Kovacs wrote:

Hi,

I'm currently experimenting with a public server running CentOS 7. I
have half a dozen production servers all running Slackware Linux, and I
intend to progressively migrate them to CentOS, for a host of reasons
(support cycle, package availability, SELinux, etc.) But before doing
that, I have to figure out a few things that work differently under
CentOS. Apache and SSL behave quite differently under these two
distributions.

So far, Apache is running fine with HTTP and hosts a series of virtual
hosts.

I have installed Certbot and created a Let's Encrypt certificate for the
server.

I have a "dummy" website under /var/www/html/default/html.

I installed mod_ssl and only edited the following directives in
/etc/httpd/conf.d/ssl.conf. I kept the default options for everything else.

--8<
...
DocumentRoot "/var/www/html/default/html"
ServerName sd-41893.dedibox.fr:443
...
SSLCertificateFile /etc/letsencrypt/live/sd-41893.dedibox.fr/cert.pem
SSLCertificateKeyFile /etc/letsencrypt/live/sd-41893.dedibox.fr/privkey.pem
SSLCertificateChainFile
/etc/letsencrypt/live/sd-41893.dedibox.fr/fullchain.pem
--8<

After restarting Apache, the website shows up correctly.

https://sd-41893.dedibox.fr/

But when I test it using Qualys SSL Labs Server Test, the results are a
disappointment.


with this:

SSLProtocol all -SSLv2 -SSLv3

SSLCipherSuite 
'EECDH+ECDSA+AESGCM:EECDH+aRSA+AESGCM:EECDH+ECDSA:EECDH:EDH+AESGCM:EDH:ECDH+AESGCM:ECDH+AES:ECDH:AES:HIGH:MEDIUM:!SSLv2:+SSLv3:!3DES:!RC4:!MD5:!IDEA:!SEED:!aNULL:!eNULL:!LOW:!EXP:!DSS:!PSK:!SRP'


SSLHonorCipherOrder on
SSLStrictSNIVHostCheck on

you get Grade A+


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Re: [CentOS] CentOS as Guest OS on Red Hat Virtualisation 4.x

[Barak Korren]

On 27 April 2017 at 20:21, Ling Yew Kim  wrote:
>
> So, my question is, technically, can CentOS run as a guest OS on RHV4? Is 
> there
> anyone that has done extensive test with CentOS on RHV? Is there any 
> documentation
> or links that can show CentOS will run fine on RHV4? Just need to show 
> customer
> that indeed CentOS is technically compatible on RHV but just not supported by
> Red Hat.

CentOS is tested extensively in oVirt, the RHV upstream opes-source
project. In fact,
most of the project's build and test infrastructure is based on CentOS
VMs running on
oVirt.

Having said that, if your customer bought RHV support licenses,
running CentOS on it
may or may not violate his support licensing terms. Please verify that with an
official RedHat sales representative or a TAM.

Please note that this response is based on my personal knowledge only
and should not considered an an official response from Red Hat in any
way.

> p/s: If you’re wondering why I’m not getting the customer to migrate CentOS 
> to RHEL
> just so that it’s a supported configuration? well, for some reason he just 
> wants to
> continue using CentOS, which I’m guessing could be caused by $$$ as they have 
> heaps
> of CentOS in their environment.

I'm no expert on this, but I think I recall that licensing RHEL
instances on RHV is
way cheaper then licensing them on VMware or any other virtualization
infrastructure,
maybe you should look into this. 

If he still prefers to stay on CentOS, perhaps he can be convinced to
use oVirt so he
can still jump-ship from VMware.

-- 
Barak Korren
RHV DevOps team , RHCE, RHCi
Red Hat EMEA
redhat.com | TRIED. TESTED. TRUSTED. | redhat.com/trusted
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Re: [CentOS] CentOS as Guest OS on Red Hat Virtualisation 4.x

[Lukas Zapletal]

You answered yourself basically, yes CentOS is essentially RHEL and it will
run. Now, the article refers to "support" and that is different topic. It
means that when you call Red Hat Support they will be able to help you with
hypervisor if the guest does not operate properly. People often confuse
phrase "is supported" with "does it run".

Just make sure to select RHEL 7 guest configuration for CentOS 7 so proper
drivers are in use for optimal performance.

2017-04-27 19:21 GMT+02:00 Ling Yew Kim :

> Hi all,
>
> I have a banking customer asking if CentOS is compatible on RHV4.0 as a
> guest VM. Based on Red Hat’s knowledge base (see link below), CentOS not
> supported guest OS.
>
> However, VMware say on their official document, CentOS is a compatible
> guest OS (see link below). So, in my customer's mind, CentOS cannot be used
> as a guest OS in RHV cause it is not compatible, which I find it hard to
> believe considering the relationship between CentOs and RHEL.
>
> RHV supported guest OS
> https://access.redhat.com/documentation/en-us/red_hat_
> virtualization/4.0/html-single/virtual_machine_
> management_guide/#Supported_virtual_machines
>
> VMware compatible guest OS
> https://partnerweb.vmware.com/comp_guide2/pdf/VMware_GOS_
> Compatibility_Guide.pdf
>
> So, my question is, technically, can CentOS run as a guest OS on RHV4? Is
> there anyone that has done extensive test with CentOS on RHV? Is there any
> documentation or links that can show CentOS will run fine on RHV4? Just
> need to show customer that indeed CentOS is technically compatible on RHV
> but just not supported by Red Hat.
>
> Many thanks.
>
> p/s: If you’re wondering why I’m not getting the customer to migrate
> CentOS to RHEL just so that it’s a supported configuration? well, for some
> reason he just wants to continue using CentOS, which I’m guessing could be
> caused by $$$ as they have heaps of CentOS in their environment.
>
>
> LING YEW KIM
> PLATFORMS SOLUTIONS ARCHITECT
> Red Hat Malaysia (ASEAN) 
> l...@redhat.com M: +6012-343-8765  +6012-343-8765>
>
>   
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S pozdravem / Best regards
  Lukas Zapletal
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