[CentOS] Optimizing Windows virtual machines

[Georgios]

Hi!

Im following the instructions found on RHEL 8 documentation.
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html-single/configuring_and_managing_virtualization/index#enabling-hyper-v-enlightenments_optimizing-windows-virtual-machines-on-rhel-8

And when I'm trying to pass the command

sudo virt-xml Windows10 --edit --features
hyperv_relaxed=on,hyperv_vapic=on,hyperv_spinlocks=on,hyperv_spinlocks_
retries=8191,hyperv_vpindex=on,hyperv_runtime=on,hyperv_synic=on,hyperv
_stimer=on,hyperv_frequencies=on

I get the following error.

ERRORUnknown --features options: ['hyperv_vpindex',
'hyperv_runtime', 'hyperv_stimer', 'hyperv_frequencies']

I can manually add the options on the xml file but i was wondering if
the feature arguments are removed and they have no effect or if I'm
missing something.

Thanks in advance

ps.Im running centos 8.1 since 8.2. broke my wifi.

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[CentOS] iwlwifi problem after Centos 8.2 update

[Georgios]

Hi!
I get high cpu usage on my laptop (yes im running Centos on my laptop)
after my last update.

At the beginning i though it was libvrtd but after stopping it gnome
monitor keep showing high cpu usage although i couldnt find the app
that was responsible for it with the top command.

I searched my log files and I saw alot of iwlwifi message.

I had to turn off wifi in order to stop high cpu usage.

Any ideas how to solve it?

Thanks in advance!

dmesg command gives me the following output:

  649.668600] RSP: 002b:7fffaa691d60 EFLAGS: 0293 ORIG_RAX:
002e
[  649.668602] RAX: ffda RBX: 000e RCX:
7f21aecdeb07
[  649.668603] RDX:  RSI: 7fffaa691db0 RDI:
000e
[  649.668604] RBP: 7fffaa691db0 R08:  R09:

[  649.668605] R10: 0012 R11: 0293 R12:

[  649.668605] R13:  R14: 7fffaa691f68 R15:
7fffaa691f5c
[  649.756674] iwlwifi :00:14.3: Found debug destination:
EXTERNAL_DRAM
[  649.756676] iwlwifi :00:14.3: Found debug configuration: 0
[  649.757247] iwlwifi :00:14.3: loaded firmware version
46.6bf1df06.0 op_mode iwlmvm
[  649.757275] iwlwifi :00:14.3: Detected Intel(R) Dual Band
Wireless AC 9462, REV=0x318
[  649.765604] iwlwifi :00:14.3: Applying debug destination
EXTERNAL_DRAM
[  649.765843] iwlwifi :00:14.3: Allocated 0x0040 bytes for
firmware monitor.
[  649.806204] iwlwifi :00:14.3: base HW address: a0:a4:c5:dd:0c:52
[  649.852141] ieee80211 phy644: Selected rate control algorithm 'iwl-
mvm-rs'
[  649.853603] thermal thermal_zone8: failed to read out thermal zone
(-61)
[  649.860442] iwlwifi :00:14.3 wlo1: renamed from wlan0
[  649.881196] IPv6: ADDRCONF(NETDEV_UP): wlo1: link is not ready
[  649.887951] iwlwifi :00:14.3: Applying debug destination
EXTERNAL_DRAM
[  649.977952] iwlwifi :00:14.3: Applying debug destination
EXTERNAL_DRAM
[  650.042990] iwlwifi :00:14.3: FW already configured (0) - re-
configuring
[  650.050559] iwlwifi :00:14.3: Conflict between TLV & NVM
regarding enabling LAR (TLV = enabled NVM =disabled)
[  650.250610] iwlwifi :00:14.3: Microcode SW error detected.
Restarting 0x0.
[  650.250685] iwlwifi :00:14.3: Start IWL Error Log Dump:
[  650.250686] iwlwifi :00:14.3: Status: 0x0040, count: 6
[  650.250687] iwlwifi :00:14.3: Loaded firmware version:
46.6bf1df06.0
[  650.250688] iwlwifi :00:14.3: 0x0071 |
NMI_INTERRUPT_UMAC_FATAL
[  650.250689] iwlwifi :00:14.3: 0x00A0A2B1 | trm_hw_status0
[  650.250690] iwlwifi :00:14.3: 0x | trm_hw_status1
[  650.250690] iwlwifi :00:14.3: 0x004882DA | branchlink2
[  650.250691] iwlwifi :00:14.3: 0x0047932A | interruptlink1
[  650.250692] iwlwifi :00:14.3: 0xB0D0 | interruptlink2
[  650.250692] iwlwifi :00:14.3: 0x0001A83E | data1
[  650.250693] iwlwifi :00:14.3: 0x1000 | data2
[  650.250694] iwlwifi :00:14.3: 0xF008 | data3
[  650.250695] iwlwifi :00:14.3: 0x | beacon time
[  650.250695] iwlwifi :00:14.3: 0x00038F74 | tsf low
[  650.250696] iwlwifi :00:14.3: 0x | tsf hi
[  650.250697] iwlwifi :00:14.3: 0x | time gp1
[  650.250697] iwlwifi :00:14.3: 0x00038F75 | time gp2
[  650.250698] iwlwifi :00:14.3: 0x0001 | uCode revision type
[  650.250699] iwlwifi :00:14.3: 0x002E | uCode version major
[  650.250700] iwlwifi :00:14.3: 0x6BF1DF06 | uCode version minor
[  650.250700] iwlwifi :00:14.3: 0x0312 | hw version
[  650.250701] iwlwifi :00:14.3: 0x18C89008 | board version
[  650.250702] iwlwifi :00:14.3: 0x001E0177 | hcmd
[  650.250702] iwlwifi :00:14.3: 0x20122080 | isr0
[  650.250703] iwlwifi :00:14.3: 0x | isr1
[  650.250704] iwlwifi :00:14.3: 0x08001802 | isr2
[  650.250704] iwlwifi :00:14.3: 0x404001C0 | isr3
[  650.250705] iwlwifi :00:14.3: 0x | isr4
[  650.250706] iwlwifi :00:14.3: 0x001E0177 | last cmd Id
[  650.250707] iwlwifi :00:14.3: 0x0001A83E | wait_event
[  650.250707] iwlwifi :00:14.3: 0x | l2p_control
[  650.250708] iwlwifi :00:14.3: 0x00010820 | l2p_duration
[  650.250709] iwlwifi :00:14.3: 0x | l2p_mhvalid
[  650.250709] iwlwifi :00:14.3: 0x | l2p_addr_match
[  650.250710] iwlwifi :00:14.3: 0x000D | lmpm_pmg_sel
[  650.250711] iwlwifi :00:14.3: 0x08081425 | timestamp
[  650.250711] iwlwifi :00:14.3: 0x183C | flow_handler
[  650.250744] iwlwifi :00:14.3: Start IWL Error Log Dump:
[  650.250744] iwlwifi :00:14.3: Status: 0x0040, count: 7
[  650.250746] iwlwifi :00:14.3: 0x2034 | NMI_INTERRUPT_WDG
[  650.250746] iwlwifi :00:14.3: 0x | umac branchlink1
[  650.250747] iwlwifi :00:14.3: 0xC008885E | umac branchlink2
[  650.250748] iwlwifi :00:14.3: 0x80454D04 | umac interruptlink1
[  650.250748] iwlwifi :00:14.3: 

Re: [CentOS] C8.1 Grub problem

[Georgios]

> 
> Hi,
> 
> I tried as suggested, parameters will be updated but I get already 
> crash. So I tried to remove also rhgb and quiet and works well.
> 
>   Would be good to know what is wrong with grub2-mkconfig.
> 
> Where start to investigate?
> 
> 
No idea. I stop looking after I manage to pass the arguments I wanted
to the kernel.
If you find the problem send an email on the list.
It would be good to know what is wrong.

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Re: [CentOS] C8.1 Grub problem

[Georgios]

Hi there!
I had a similar problem recently with grub. No idea why it doesnt work.
Try using grubby instead of grub2-mkconfig if you want the system to
keep your kernel parameters between boots.

Something like:

sudo grubby --args="i915.modeset=0 rd.driver.blacklist=i915" --update-
kernel=ALL


Hope it helps!
Have a nice day!


On Mon, 2020-04-06 at 11:42 +0200, Alessandro Baggi wrote:
> Hi list,
> 
> I reinstalled on my workstation CentOS 8.1.
> 
> I explain: I'm a KDE user but packages shipped from EPEL currently
> are 
> buggy so I prefer a stable and functioning system to work with. So I 
> tried to remove KDE workgroup and installed group "Workstation" but
> the 
> system bricked so I reinstalled with GNOME.
> 
> I've an nvidia gtx 1050ti GPU so I installed kmod-driver from
> rpmfusion. 
> After the installation of Nvidia driver, I rebooted, gdm start and
> after 
> I perform the login the system freeze. So this problem happened to
> me 
> with C7.5 and nvidia driver. In my case I need to blacklist i915
> module 
> and system works.
> 
> Also in this case I tried to boot centos changing grub kernel
> parameters 
> pressing 'e' in the grub menu and adding "i915.modeset=0 
> rd.driver.blacklist=i915", booted and system works.
> 
> So I tried to make this permanent updating grub configuration adding
> the 
> previous directives (and removed rhgb and quiet) to
> /etc/default/grub 
> and run grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg.
> 
> Reboot the system and checked again kernel parameters on grub menu
> and 
> seen that nothing changed. Booted and freezed.
> 
> I checked /boot/efi/EFI/centos/grub.cfg and kernelops has the new 
> directives.
> 
> Seems that grub configuration does not take effect.
> 
> I made another test inside a VM installed with minimal selection and 
> remove rhgb and quiet parameters and worked fine. The vm is BIOS and
> my 
> workstation UEFI.
> 
> How I can solve this problem? Currently to boot my system I need
> always 
> to add this params.
> 
> Thank you in advance
> 
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Re: [CentOS] Windows 10 as guest on Centos 8

[Georgios]

Thanks Jyrki and Leroy.

I tried to use cockpit but virt-manager seems easier. 
Is there a config file for cockpit? Where is it?

On Sun, 2020-04-05 at 17:58 +0300, Jyrki Tikka wrote:
> I agree with Liam. The good old tried and tested virt-manager will be
> obsoleted in the future but it is still available on RHEL/CentOS 8.
> Cockpit will replace it in the future but it still lacks a lot of
> essential features.
> 
> Boxes is a tool that lacks even more functionality.
> 
> As to why your computer freezes I have no clue.
> 

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Re: [CentOS] IOMMU and kernel

[Georgios]

yes it exist.
 
thanks

On Fri, 2020-04-03 at 15:00 -0400, Jonathan Billings wrote:
> On Fri, Apr 03, 2020 at 09:40:09PM +0300, Georgios wrote:
> > Yes 
> > 
> > dmesg | grep "EFI v"
> > [0.00] efi: EFI v2.70 by American Megatrends
> 
> That's not always the best test, you should look for the existence of
> /sys/firmware/efi to determine if you're using an EFI system.
> 
> 'grubby' knows to update the configuration file for Legacy vs. UEFI. 
> 

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Re: [CentOS] IOMMU and kernel (solved?)

[Georgios]

No Centos 8.

Funny thing... i didnt find alot of info online about that problem. 

I was guessing other people could run to the same problem with me.

Anyway. I dont know what happened either :-s

Thanks


On Fri, 2020-04-03 at 20:55 +0200, Simon Matter via CentOS wrote:
> Hi,
> 
> > I think i might have solve it.
> > 
> > For some reason grub2-mkconfig doesnt work.  (Have no idea why)
> 
> Is this on CentOS 7?
> 
> Well, yes, I remember that it didn't work for me when I installed new
> servers one or two years ago, that was with CentOS 7 and they were my
> first EFI installs.
> 
> > I manage to solve it with grubby.
> > 
> > sudo grubby --args="intel_iommu=on" --update-kernel=ALL
> > 
> > For some reason it works. I dont know if it works if my kernel gets
> > upgraded.
> 
> I have restored the original configs after messing with grub2-
> mkconfig and
> only used kernel installs to further modify grub config. That way it
> has
> always worked for me. And I was a bis scared by the whole EFI, grub2
> and
> everything around it because I felt I don't really understand how it
> all
> interacts in detail.
> 
> Regards,
> Simon
> 
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Re: [CentOS] IOMMU and kernel (solved?)

[Georgios]

I think i might have solve it.

For some reason grub2-mkconfig doesnt work.  (Have no idea why)

I manage to solve it with grubby.

sudo grubby --args="intel_iommu=on" --update-kernel=ALL

For some reason it works. I dont know if it works if my kernel gets
upgraded.



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Re: [CentOS] IOMMU and kernel

[Georgios]

Yes 

dmesg | grep "EFI v"
[0.00] efi: EFI v2.70 by American Megatrends


On Fri, 2020-04-03 at 14:29 -0400, Jonathan Billings wrote:
> On Fri, Apr 03, 2020 at 07:37:10PM +0300, Georgios wrote:
> > Hi.
> > Im trying to set intel_iommu=on on kernel parameters at grub but
> > for
> > some reason it doesnt work.
> > 
> > I edit /etc/default/grub file and i add the parameter.
> > 
> > then i run grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg and then
> > i
> > reboot.
> > 
> > when i run virt-host-validate i get 
> > 
> > QEMU: Checking if IOMMU is enabled by kernel: WARN (IOMMU appears
> > to be
> > disabled in kernel. Add intel_iommu=on to kernel cmdline arguments)
> > 
> > when i edit the grub menu durring boot and i put intel_iommu=on and
> > the
> > i run again virt-host-validate i get
> > 
> > QEMU: Checking if IOMMU is enabled by kernel: PASS
> > 
> > 
> > any ideas?
> 
> This is a libvirtd KVM machine?  Are you sure you're using UEFI?
> 

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Re: [CentOS] IOMMU and kernel

[Georgios]

Yes i can find intel_iommu=on. For some reason it doesnt take it when i
reboot.

On Fri, 2020-04-03 at 18:44 +0200, Simon Matter via CentOS wrote:
> > Hi.
> > Im trying to set intel_iommu=on on kernel parameters at grub but
> > for
> > some reason it doesnt work.
> > 
> > I edit /etc/default/grub file and i add the parameter.
> > 
> > then i run grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg and then
> > i
> > reboot.
> 
> When you look at /boot/efi/EFI/centos/grub.cfg, do you see that the
> parameter has been added?
> 
> Regards,
> Simon
> 
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[CentOS] IOMMU and kernel

[Georgios]

Hi.
Im trying to set intel_iommu=on on kernel parameters at grub but for
some reason it doesnt work.

I edit /etc/default/grub file and i add the parameter.

then i run grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg and then i
reboot.

when i run virt-host-validate i get 

QEMU: Checking if IOMMU is enabled by kernel: WARN (IOMMU appears to be
disabled in kernel. Add intel_iommu=on to kernel cmdline arguments)

when i edit the grub menu durring boot and i put intel_iommu=on and the
i run again virt-host-validate i get

QEMU: Checking if IOMMU is enabled by kernel: PASS


any ideas?

I tried editing other variables like GRUB_TIMEOUT and it seems to me
that changes are applied.

Thanks in advance

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[CentOS] Windows 10 as guest on Centos 8

[Georgios]

Hi there!
Im trying to install windows 10 as a guest on Centos 8.1
I tried with cockpit and with boxes and both times my computer freezes
during installation.

Any ideas?

Thanks in advance!

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Re: [CentOS] mplayer or vlc?

[Georgios]

On Fri, 2019-10-18 at 13:54 -0700, Gordon Messmer wrote:
> 
> way to keep applications that aren't well packaged isolated from the 
> applications that are.
> 

That's an excellent reason!
(Beside using newer applications etc)

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Re: [CentOS] Centos 8 Mate?

[Georgios]

you should give gnome3 some time.
Here is the thing.
At the beginning i disliked gnome3. I tried it for 1 or 2 days and then
i turned to xfce. 

I started using gnome3 when one of my friends said that it is usable if
you get use to it. I also considered the fact that desktop environments
like xfce have a small development team and they delay to transits to
new technologies.

I gave a try to gnome3 for a couple of weeks and it works fine.
I dont even considering changing back.


On Fri, 2019-10-18 at 12:04 +0200, Ljubomir Ljubojevic wrote:
> On 10/17/19 4:08 PM, Johnny Hughes wrote:
> > On 9/24/19 2:41 PM, Frank Cox wrote:
> > > Without wanting to sound too pushy, I'm wondering if there is any
> > > update on the status of Mate now that Centos 8 has been released?
> > > 
> > > I would love to jump on C8 and start playing with it, but the
> > > lack of Mate is kind of  a showstopper for me at the moment.
> > > 
> > 
> > Is gnome3 really that bad :D
> 
> Yes, it is.
> 
> My main reason is this (it has to do with me starting with Windows
> 3.1
> and those functionalities are in Windows even today I have to use and
> support at work):
> 1. All tray icons are visible so I can see if message or mail
> comes without need to move more then eyeball.
> 2. I can put icon on a desktop, document or link to app.
> 3. I can easily see all open apps and swith to them using mouse
> 4. I can put links to panel in top/bottom of the screen, visible and
> easily accessible.
> 5. I want easily visible and accessible multiple workspaces I can
> switch
> to. I like separate opened apps several per workspace custered for a
> specifig (simultanious) job/task, Firefox in one Krusader in another,
> VM
> i third, something else in forth...Then I can switch between apps IN
> THAT workspace, I do not have to choose from dozes of windows (like
> with
> Alt+Tab)
> 
> If Gnome 3 (Classic) can be configured to do such things in one go
> (chosing a theme "Gnome 2") I would switch to it.
> 
> 
> 
> > I decided to just bite the bullet and shift to real gnome3 (and not
> > the
> > classic) about 4 years ago.  It waas different and took some time
> > to
> > learn .. BUT .. I can do everything I need to do now.
> > 
> > I like both mate and cinnamon .. so I am not knocking either one. I
> > just
> > think people might be well server switching to a 'supported'
> > desktop in
> > the longer run.
> > 
> > Again .. don't get me wrong .. it's open source, so do what makes
> > you
> > happy :D
> > 
> > 
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> > 
> 
> 

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Re: [CentOS] Top 7 Programming Languages That Employers Really Want

[Georgios]

explanation to my comment.
It depends where you live.

On Fri, 2019-10-18 at 08:46 +0200, Georgios wrote:
> Your sample isnt representative.
> 
> 
> On Fri, 2019-10-18 at 10:28 +0800, Turritopsis Dohrnii Teo En Ming
> wrote:
> > Subject: Top 7 Programming Languages That Employers Really Want
> > 
> > Good day from Singapore,
> > 
> > Article: Top 7 Programming Languages That Employers Really Want
> > Author: Nick Kolakowski
> > Date Published: 14 October 2019
> > Link: 
> > https://insights.dice.com/2019/10/14/7-programming-languages-employers-want/
> > 
> > This is just a quick survey. May I know what programming languages
> > do
> > you know? I am considering being a programmer or developer.
> > How long will it take for me to master a programming language like
> > C++, Java, and Python?
> > 
> > Thank you very much.
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > -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 and refugee seeking attempts at
> > the
> > United Nations Refugee Agency Bangkok (21 Mar 2017) and in Taiwan
> > (5
> > Aug 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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Re: [CentOS] Top 7 Programming Languages That Employers Really Want

[Georgios]

Your sample isnt representative.


On Fri, 2019-10-18 at 10:28 +0800, Turritopsis Dohrnii Teo En Ming
wrote:
> Subject: Top 7 Programming Languages That Employers Really Want
> 
> Good day from Singapore,
> 
> Article: Top 7 Programming Languages That Employers Really Want
> Author: Nick Kolakowski
> Date Published: 14 October 2019
> Link: 
> https://insights.dice.com/2019/10/14/7-programming-languages-employers-want/
> 
> This is just a quick survey. May I know what programming languages do
> you know? I am considering being a programmer or developer.
> How long will it take for me to master a programming language like
> C++, Java, and Python?
> 
> Thank you very much.
> 
> 
> 
> 
> 
> 
> 
> 
> 
> -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 and refugee seeking attempts at the
> United Nations Refugee Agency Bangkok (21 Mar 2017) and in Taiwan (5
> Aug 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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Re: [CentOS] mplayer or vlc?

[Georgios]

You can also use VLC through flatpak.

On Tue, 2019-10-15 at 16:42 +0200, Ljubomir Ljubojevic wrote:
> On 10/15/19 4:20 PM, Adrian van Bloois wrote:
> > Hi,
> > Is there an mplayer or vlc available for CentOS-8?
> 
> There is a VLC 3.x in RPMFusion: https://rpmfusion.org/
> 
> Nux will not be creating repo for EL8, due to lack of time.
> 
> 
> > Adrian
> > 
> > 
> > 
> 
> 

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Re: [CentOS] Browser doesnt work

[Georgios]

I forgot to add that i had to change to desktop profile from network-
throughput in order to manage to copy my photo files from my external
hard disk to my laptop.  If i didnt do that my laptop froze. :-!

Had to 
On Tue, 2019-10-15 at 16:02 +0200, Georgios wrote:
> Well kind of.
> 
> for example i had to do the following stuff for my laptop
> 
> 
> -add epel repository so i can install keepassxc
> -manual install eclipse
> -enable rpmfusion in order to have 
>   --media support on my browser and 
>   --install totem codecs in order for it to play video files
> 
> With flatpak i think centos is more desktop friendly.
> The rest of the apps where installed through flatpak so it was quite
> easy.  Most of these apps arent on Centos repositories so without
> flatpak it would be a bit difficult.
> Also with flatpak you can have newer versions of the apps that could
> be
> a problem.
> 
> Besides that i have to say. 
> 
> flatpak itself is really old and it doesn't support my yubikey.
> Thats the reason i had to install keepassxc through epel repository
> and
> not flatpak.
> I do hope flatpak gets updated on a future point release.
> 
> 
> Another problem i currently have is that evolution after suspense
> sometimes it seems to brake. It happened 2 times last weeks but i
> could
> not reproduce.
> 
> 
> I previous had debian 9 and 10.
> If i compare these 2 i have to say.
> 
> Centos 8 had a bit less configuration for laptop compared with debian
> 9
> but a bit more compared to debian 10.
> 
> I guess it all depends what you want to do with your laptop. 
> For basic usage it seems fine.
> 
> Anyway for the time being it seems usable. 
> But i wouldn't recommend it to someone who use linux for the first
> time.
> I would suggest ubuntu or something like this.
> 
> 
> 
> On Tue, 2019-10-15 at 14:18 +0100, John Hodrien wrote:
> > On Tue, 15 Oct 2019, Nicolas Kovacs wrote:
> > 
> > > CentOS is a desktop distribution in the sense that chickens fly
> > > and
> > > horses 
> > > swim. Of course you can turn it into a full-blown bells-and-
> > > whistles desktop 
> > > by fine-tuning the configuration and adding lots of third-party
> > > stuff. I've 
> > > done this myself for years, here for example:
> > > 
> > > https://www.microlinux.fr/poste-de-travail-entreprise-centos-7-kde/
> > > 
> > > On the other hand, CentOS out of the box is a rather frustrating
> > > experience 
> > > on the desktop.
> > 
> > I've always disagreed with this view, however common it appears to
> > be.
> > 
> > RHEL is sold as an Enterprise OS for Server, Cloud, Desktop,
> > Laptop.  CentOS
> > surely shouldn't be seen any differently.
> > 
> > What is it that makes CentOS a bad desktop OS?
> > 
> > I can install CentOS 8 on my laptop now, with a perfectly usable
> > desktop, and
> > 10 years of support.  Google Chrome runs just fine, and I can use
> > containers
> > via singularity on top for anything exotic.
> > 
> > What exactly am I missing out on by not running something else?
> > 
> > jh
> > ___
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Re: [CentOS] Browser doesnt work

[Georgios]

Well kind of.

for example i had to do the following stuff for my laptop


-add epel repository so i can install keepassxc
-manual install eclipse
-enable rpmfusion in order to have 
--media support on my browser and 
--install totem codecs in order for it to play video files

With flatpak i think centos is more desktop friendly.
The rest of the apps where installed through flatpak so it was quite
easy.  Most of these apps arent on Centos repositories so without
flatpak it would be a bit difficult.
Also with flatpak you can have newer versions of the apps that could be
a problem.

Besides that i have to say. 

flatpak itself is really old and it doesn't support my yubikey.
Thats the reason i had to install keepassxc through epel repository and
not flatpak.
I do hope flatpak gets updated on a future point release.


Another problem i currently have is that evolution after suspense
sometimes it seems to brake. It happened 2 times last weeks but i could
not reproduce.


I previous had debian 9 and 10.
If i compare these 2 i have to say.

Centos 8 had a bit less configuration for laptop compared with debian 9
but a bit more compared to debian 10.

I guess it all depends what you want to do with your laptop. 
For basic usage it seems fine.

Anyway for the time being it seems usable. 
But i wouldn't recommend it to someone who use linux for the first
time.
I would suggest ubuntu or something like this.



On Tue, 2019-10-15 at 14:18 +0100, John Hodrien wrote:
> On Tue, 15 Oct 2019, Nicolas Kovacs wrote:
> 
> > CentOS is a desktop distribution in the sense that chickens fly and
> > horses 
> > swim. Of course you can turn it into a full-blown bells-and-
> > whistles desktop 
> > by fine-tuning the configuration and adding lots of third-party
> > stuff. I've 
> > done this myself for years, here for example:
> > 
> > https://www.microlinux.fr/poste-de-travail-entreprise-centos-7-kde/
> > 
> > On the other hand, CentOS out of the box is a rather frustrating
> > experience 
> > on the desktop.
> 
> I've always disagreed with this view, however common it appears to
> be.
> 
> RHEL is sold as an Enterprise OS for Server, Cloud, Desktop,
> Laptop.  CentOS
> surely shouldn't be seen any differently.
> 
> What is it that makes CentOS a bad desktop OS?
> 
> I can install CentOS 8 on my laptop now, with a perfectly usable
> desktop, and
> 10 years of support.  Google Chrome runs just fine, and I can use
> containers
> via singularity on top for anything exotic.
> 
> What exactly am I missing out on by not running something else?
> 
> jh
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Re: [CentOS] Browser doesnt work

[Georgios]

Thanks problem solved!

ps.I think Centos is becoming a really reliable OS for my laptop :-)

On Sun, 2019-10-13 at 11:55 -0400, Jonathan Billings wrote:
> On Oct 13, 2019, at 11:54 AM, Jonathan Billings 
> wrote:
> > I believe that elrepo.org  has ffmpeg-libs for
> > el8.
> > https://download1.rpmfusion.org/free/el/updates/8/x86_64/repoview/ffmpeg-libs.html
> >  > /ffmpeg-libs.html>
> I started writing that sentence and realized it was rpmfusion, which
> is the correct URL.  Ignore the elrepo.org 
> mention.
> 
> 
> --
> Jonathan Billings 
> 
> 
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Re: [CentOS] Browser doesnt work

[Georgios]

Of course
How stupid of me
firefox!

On Sun, 2019-10-13 at 08:49 -0700, g...@uniserve.com wrote:
> 
> 
> 
> On Sunday 13/10/2019 at 8:43 am, Georgios  wrote:
> > Hello.
> > 
> > Im new on Centos
> > I recently installed Centos 8 and i have the following problem with
> > my
> > browser
> > 
> > I cant play media on the browser.
> 
> which browser?
> 
> d
> 
> > 
> > for example i cant play.
> > https://twitter.com/Ffs_OMG/status/1183397555914366976
> > 
> > Or i cant listen shows or songs on mixcloud.
> > 
> > for example
> > https://www.mixcloud.com/parapolitika-parapolitika/%CE%B3%CE%B9%CF%89%CF%81%CE%B3%CE%BF%CF%83-%CF%80%CE%B1%CF%84%CE%BF%CF%85%CE%BB%CE%B7%CF%83_%CF%80%CE%B1%CF%81%CE%B1%CF%80%CE%BF%CE%BB%CE%B9%CF%84%CE...
> > 
> > i get the message
> > 
> > "Sorry - your browser is not supported.
> > 
> > Please update your browser or install another such as Google
> > Chrome.
> > Mixcloud requires HTML5 audio with MP3 and MP4 support."
> > 
> > I suspect that these 2 problems relate.
> > 
> > Any ideas how to solve this problem?
> > 
> > Thanks in advance!
> > 
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[CentOS] Browser doesnt work

[Georgios]

Hello.

Im new on Centos
I recently installed Centos 8 and i have the following problem with my
browser

I cant play media on the browser.

for example i cant play.
https://twitter.com/Ffs_OMG/status/1183397555914366976

Or i cant listen shows or songs on mixcloud.

for example 
https://www.mixcloud.com/parapolitika-parapolitika/%CE%B3%CE%B9%CF%89%CF%81%CE%B3%CE%BF%CF%83-%CF%80%CE%B1%CF%84%CE%BF%CF%85%CE%BB%CE%B7%CF%83_%CF%80%CE%B1%CF%81%CE%B1%CF%80%CE%BF%CE%BB%CE%B9%CF%84%CE%B9%CE%BA%CE%B1901_24-5/

i get the message 

"Sorry - your browser is not supported.

Please update your browser or install another such as Google Chrome.
Mixcloud requires HTML5 audio with MP3 and MP4 support."

I suspect that these 2 problems relate.

Any ideas how to solve this problem?

Thanks in advance!

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Re: [CentOS] Centos & media codec

[Georgios]

Fabian
Thanks for the fast reply.

I just installed VLC.
:-)



On Tue, 2019-10-08 at 07:57 +0200, Fabian Arrotin wrote:
> RPMfusion

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[CentOS] Centos & media codec

[Georgios]

Hello im trying to play some videos with totem on CentOS 8.

I get the following message in the command line.

"totem
** Message: 17:22:06.269: Missing plugin: gstreamer|1.0|totem|MPEG-1
Video decoder|decoder-video/mpeg, mpegversion=(int)1,
systemstream=(boolean)false (MPEG-1 Video decoder)

(totem:12230): Gtk-WARNING **: 17:22:06.270: Drawing a gadget with
negative dimensions. Did you forget to allocate a size? (node slider
owner GtkScale)
"

I also get the following message.

MPEG-4 Video (Simple Profile) decoder is required to play the file, but
is not installed.


Any ideas what i have to install in order to play it?

Thanks in advance!

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Re: [CentOS] Centos 8: Multiple bugs with email/calendar

[Georgios]

First of all thanks for your fast reply.


Second.
The server im trying to use is https://dav.mailbox.org/caldav I dont
think its a problem with my configuration (although i can always be
wrong). I suspect a bug in evolution because sometimes it works.
Sometimes i manage to create an event sometimes i cant.

I started evolution from a terminal and i noticed that when i fail to
create an event i get the following message

"(evolution:26852): libecal-CRITICAL **: 11:45:50.282:
e_cal_component_alarm_set_description: assertion 'description->value !=
NULL' failed"

I tried without setting an alarm and i can create events with no
problem!!
So I filled a bug report https://bugs.centos.org/view.php?id=16507


Third.
I have no idea if its a configuration problem. Newer flatpak versions
work fine! I searched online and found this
https://github.com/flatpak/flatpak/issues/3076

marked as enhancement!

ps.Im wondering if evolution in Centos is going to have 5+ year life-
cycle or if it gets upgraded earlier.


On Tue, 2019-10-01 at 08:25 -0400, Stephen John Smoogen wrote:
> On Tue, 1 Oct 2019 at 03:40, Georgios 
> wrote:
> > Hi there!
> > I recently installed centos 8 on my laptop.
> > 
> > I have the following problems
> > 
> > 1. I tried the use the default evolution 3.28.
> > The problem with 3.28 is that when i try to create an event i get
> > the error
> > "Failed to create an event in the calendar “CalDAV : Calendar”"
> > "Cannot create calendar object: Failed to put data: HTTP error code
> > 400
> > (Bad Request)"
> > 
> 
> That sounds like a configuration issue that your calendar server is
> not liking the authentication that evolution sent. We would need to
> know
> 1. what the calendar server you are trying to use
> 2. what the configuration and how you authenticate
> 3. what the error on the server side is.
> 
> > 2.I tried installing evolution from flatpak 3.34
> > Calendar works fine! BUT cant use my yubikey to read my encrypted
> > emails :-(
> > For some reason flatpak seems unable to work with smartcards.
> > Had the same issue with keepassxc and yubikey
> > 
> 
> Flatpacks are sandboxes to make sure that the rest of your account is
> secure from each other https://xkcd.com/1200/ . You have to configure
> what applications you want to be able to talk to your smart card or
> yubikey because just allowing anything to talk to them just leads to
> the xkcd.
> 
> That said, I do not know how to do this. My systems are pre-flatpak
> so
> I have not dealt with this.
> 
> 
> > 3.My third attempt was to use thunderbird from flatpak.
> > I installed thunderbird through flatpak to see if i could overcome
> > the
> > flatpak yubikey problem.
> > Thunderbird starts but then crushes with the following message
> > "flatpak run org.mozilla.Thunderbird
> > Gtk-Message: 09:15:00.372: Failed to load module "pk-gtk-module"
> > Gtk-Message: 09:15:00.372: Failed to load module "canberra-gtk-
> > module"
> > Gtk-Message: 09:15:00.372: Failed to load module "pk-gtk-module"
> > Gtk-Message: 09:15:00.372: Failed to load module "canberra-gtk-
> > module"
> > "
> > 
> 
> Ouch. That should be reported to the flatpak place you got that from.
> Those aren't created by centos.org so I am guessing gnome or
> flatpak.org ?
> 
> 
> > I would prefer to use evolution than thunderbird.
> > 
> > Any ideas how to solve the calendar or flatpak and yubikey problem?
> > 
> > Thanks in advance!!!
> > 
> > 
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[CentOS] Centos 8: Multiple bugs with email/calendar

[Georgios]

Hi there!
I recently installed centos 8 on my laptop.

I have the following problems

1. I tried the use the default evolution 3.28.
The problem with 3.28 is that when i try to create an event i get the error
"Failed to create an event in the calendar “CalDAV : Calendar”"
"Cannot create calendar object: Failed to put data: HTTP error code 400
(Bad Request)"

2.I tried installing evolution from flatpak 3.34
Calendar works fine! BUT cant use my yubikey to read my encrypted emails :-(
For some reason flatpak seems unable to work with smartcards.
Had the same issue with keepassxc and yubikey

3.My third attempt was to use thunderbird from flatpak.
I installed thunderbird through flatpak to see if i could overcome the
flatpak yubikey problem.
Thunderbird starts but then crushes with the following message
"flatpak run org.mozilla.Thunderbird
Gtk-Message: 09:15:00.372: Failed to load module "pk-gtk-module"
Gtk-Message: 09:15:00.372: Failed to load module "canberra-gtk-module"
Gtk-Message: 09:15:00.372: Failed to load module "pk-gtk-module"
Gtk-Message: 09:15:00.372: Failed to load module "canberra-gtk-module"
"

I would prefer to use evolution than thunderbird.

Any ideas how to solve the calendar or flatpak and yubikey problem?

Thanks in advance!!!


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[CentOS] LVM and thin snapshots

[Georgios]

Hi there!

Im new here.

Im trying to install Centos 8 on my laptop. I also want to have a
contingency plan in case something brakes.

My first thoughts were to use LVM.

The idea is that i would take multiple snapshots of the system during
the day/week and will keep them for a short time.

I read RHEL documentation about how lvm works and pretty much understand
how to manage the above scenario with LVM snapshots and encryption.
If i understood lvm snapshots will cause delay the system after multiple
snapshots.  The best way to avoid it is using thin snapshots.

At rhel documentation it says that is possible for a non thin volume to
get a thin snapshots.

[Correct me if my above assumptions are wrong or if there is a better
solution for my purpose.]

So i created a group with 3 volumes groups and one thin pool.

Im trying to take a snapshot and i get the message.

"Cannot use writable LV as the external origin."

I read somewhere that i should change it to read only and then take a
snapshot. Although that would be a problem i just try it to see if it
works. Then i got the message

"Cannot use active LV for the external origin"

Any ideas???

Thanks in advance

Georgios
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