Re: [CentOS] Livepatch: Linux kernel updates without rebooting
On Thu, Oct 10, 2019 at 1:33 AM John Pierce wrote: > On Wed, Oct 9, 2019 at 11:27 AM Kaushal Shriyan > wrote: > > > Hi, > > > > I am running CentOS Linux release 7.7.1908 (Core). Does CentOS Linux > kernel > > 3.10.0-1062.1.1.el7.x86_64 support kernel updates without rebooting (Live > > Patching)? > > > > I look forward to hearing from you and thanks in advance. > > > > > > > this was just discussed in length on this list a few days ago. See the > thread starting here, > https://lists.centos.org/pipermail/centos/2019-October/173703.html > > the short answer is, no. and even the paid distributions that do support > live patching, its pretty iffy. > Thanks John for the reply and much appreciated. ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] browsers slowing Centos 7 installation to a crawl
On Wed, 9 Oct 2019, Frank Cox wrote: On Wed, 9 Oct 2019 17:14:12 -0500 (CDT) Michael Hennebry wrote: I cannot even replace the memory I removed. There might be dirt plugging up the slot. Try vacuuming the slot out (carefully) and see if it fits after that. The process gave me a better look at the mechanics of latching. Apparently the latches are supposed to activate as one pushes the cards down. Pushing in the middle did not give me enough leverage to activate stiff latches. Once I realized that, pushing on the ends did the trick It boots and notices 8GB. -- Michael henne...@web.cs.ndsu.nodak.edu "Sorry but your password must contain an uppercase letter, a number, a haiku, a gang sign, a heiroglyph, and the blood of a virgin." -- someeecards ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] browsers slowing Centos 7 installation to a crawl
On Wed, 9 Oct 2019 17:14:12 -0500 (CDT) Michael Hennebry wrote: > I cannot even replace the memory I removed. There might be dirt plugging up the slot. Try vacuuming the slot out (carefully) and see if it fits after that. -- MELVILLE THEATRE ~ Real D 3D Digital Cinema ~ www.melvilletheatre.com ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] browsers slowing Centos 7 installation to a crawl
On Tue, 6 Aug 2019, Peter wrote: 2. Run out and buy more RAM. Max your system out at 4G or 8G or whatever it will take. You will need it and appreciate it. My fears and trepidations have been realized. I finally got around to trying to install the memory I bought. No go. The first card seems like it's in almost ok, but will not go far enough down to be latched. The notches seem correct. I cannot even replace the memory I removed. Grrr. The net result seem to be that I destroyed my computer. Any thoughts on how to undestroy my computer? -- Michael henne...@web.cs.ndsu.nodak.edu "Sorry but your password must contain an uppercase letter, a number, a haiku, a gang sign, a heiroglyph, and the blood of a virgin." -- someeecards ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] What is /etc/subuid ?
On 2019-10-09 15:39, Stephen John Smoogen wrote: On Wed, 9 Oct 2019 at 16:34, Valeri Galtsev wrote: On 2019-10-09 14:58, Jonathan Billings wrote: On Wed, Oct 09, 2019 at 02:47:19PM -0500, Valeri Galtsev wrote: Could someone enlighten me about the following file: /etc/subuid ? This file appears to be owned by "setup" package. This is CentOS 7 system, and until now these files if existed were never changed. Today I have added user quite routine way, by doing /usr/sbin/groupadd -g 4500 [username] /usr/sbin/useradd -g [username] -u 4500 -c "User Name, email@domain" [username] And the file /etc/subuid changed and user was added into it: [username]:10:65536 I'm not sure what else it's used for, but /etc/subuid and /etc/subgid are used by podman for rootless containers (i.e. you can run a container without any root permissions). subuid/subgid is used to map a range of UID/GIDs to the process namespace inside the kernel. Some details here: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux_atomic_host/7/html-single/managing_containers/index#set_up_for_rootless_containers It's actually pretty cool. So, now when accounts are created with useradd, subuids are assigned to that new user. Unfortunately, this doesn't really work in an enterprise environment when users are defined via LDAP, since no subuid/subgid entries are created, but I've heard that there's an effort to make that happen in the NSS layer in the future. Thank you, Michael and Jonathan for your answers. I have one more question (which I probably will just answer myself by kickstart installing fresh new system...): Did something changed and now by default useradd command adds user in that file (by default without me using extra flag etc)? In other words is it just me or indeed the command we used since forever suddenly changed its behavior? I believe it is a new behavior (by about a year). This file was not in earlier versions of RHEL because my systems only seem to have it showing up after 2018-10 Thanks, you made me feel myself better. I create users on Linux machines routinely, I have created previous user two or three weeks ago, and the command useradd didn't behave like that. Valeri Thanks again for your insights everybody. Valeri -- Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos -- Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] What is /etc/subuid ?
On Wed, 9 Oct 2019 at 16:34, Valeri Galtsev wrote: > > > > On 2019-10-09 14:58, Jonathan Billings wrote: > > On Wed, Oct 09, 2019 at 02:47:19PM -0500, Valeri Galtsev wrote: > >> Could someone enlighten me about the following file: > >> > >> /etc/subuid > >> > >> ? This file appears to be owned by "setup" package. This is CentOS 7 > >> system, > >> and until now these files if existed were never changed. Today I have added > >> user quite routine way, by doing > >> > >> /usr/sbin/groupadd -g 4500 [username] > >> /usr/sbin/useradd -g [username] -u 4500 -c "User Name, email@domain" > >> [username] > >> > >> And the file /etc/subuid changed and user was added into it: > >> > >> [username]:10:65536 > > > > I'm not sure what else it's used for, but /etc/subuid and /etc/subgid > > are used by podman for rootless containers (i.e. you can run a > > container without any root permissions). subuid/subgid is used to map > > a range of UID/GIDs to the process namespace inside the kernel. > > > > Some details here: > > > > https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux_atomic_host/7/html-single/managing_containers/index#set_up_for_rootless_containers > > > > It's actually pretty cool. > > > > So, now when accounts are created with useradd, subuids are assigned > > to that new user. > > > > Unfortunately, this doesn't really work in an enterprise environment > > when users are defined via LDAP, since no subuid/subgid entries are > > created, but I've heard that there's an effort to make that happen in > > the NSS layer in the future. > > > > Thank you, Michael and Jonathan for your answers. > > I have one more question (which I probably will just answer myself by > kickstart installing fresh new system...): > > Did something changed and now by default useradd command adds user in > that file (by default without me using extra flag etc)? In other words > is it just me or indeed the command we used since forever suddenly > changed its behavior? > I believe it is a new behavior (by about a year). This file was not in earlier versions of RHEL because my systems only seem to have it showing up after 2018-10 > Thanks again for your insights everybody. > > Valeri > > > > > -- > > Valeri Galtsev > Sr System Administrator > Department of Astronomy and Astrophysics > Kavli Institute for Cosmological Physics > University of Chicago > Phone: 773-702-4247 > > ___ > CentOS mailing list > CentOS@centos.org > https://lists.centos.org/mailman/listinfo/centos -- Stephen J Smoogen. ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] What is /etc/subuid ?
On 2019-10-09 14:58, Jonathan Billings wrote: On Wed, Oct 09, 2019 at 02:47:19PM -0500, Valeri Galtsev wrote: Could someone enlighten me about the following file: /etc/subuid ? This file appears to be owned by "setup" package. This is CentOS 7 system, and until now these files if existed were never changed. Today I have added user quite routine way, by doing /usr/sbin/groupadd -g 4500 [username] /usr/sbin/useradd -g [username] -u 4500 -c "User Name, email@domain" [username] And the file /etc/subuid changed and user was added into it: [username]:10:65536 I'm not sure what else it's used for, but /etc/subuid and /etc/subgid are used by podman for rootless containers (i.e. you can run a container without any root permissions). subuid/subgid is used to map a range of UID/GIDs to the process namespace inside the kernel. Some details here: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux_atomic_host/7/html-single/managing_containers/index#set_up_for_rootless_containers It's actually pretty cool. So, now when accounts are created with useradd, subuids are assigned to that new user. Unfortunately, this doesn't really work in an enterprise environment when users are defined via LDAP, since no subuid/subgid entries are created, but I've heard that there's an effort to make that happen in the NSS layer in the future. Thank you, Michael and Jonathan for your answers. I have one more question (which I probably will just answer myself by kickstart installing fresh new system...): Did something changed and now by default useradd command adds user in that file (by default without me using extra flag etc)? In other words is it just me or indeed the command we used since forever suddenly changed its behavior? Thanks again for your insights everybody. Valeri -- Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Livepatch: Linux kernel updates without rebooting
On Wed, Oct 9, 2019 at 11:27 AM Kaushal Shriyan wrote: > Hi, > > I am running CentOS Linux release 7.7.1908 (Core). Does CentOS Linux kernel > 3.10.0-1062.1.1.el7.x86_64 support kernel updates without rebooting (Live > Patching)? > > I look forward to hearing from you and thanks in advance. > > > this was just discussed in length on this list a few days ago. See the thread starting here, https://lists.centos.org/pipermail/centos/2019-October/173703.html the short answer is, no. and even the paid distributions that do support live patching, its pretty iffy. -- -john r pierce recycling used bits in santa cruz ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] What is /etc/subuid ?
On Wed, Oct 09, 2019 at 02:47:19PM -0500, Valeri Galtsev wrote: > Could someone enlighten me about the following file: > > /etc/subuid > > ? This file appears to be owned by "setup" package. This is CentOS 7 system, > and until now these files if existed were never changed. Today I have added > user quite routine way, by doing > > /usr/sbin/groupadd -g 4500 [username] > /usr/sbin/useradd -g [username] -u 4500 -c "User Name, email@domain" > [username] > > And the file /etc/subuid changed and user was added into it: > > [username]:10:65536 I'm not sure what else it's used for, but /etc/subuid and /etc/subgid are used by podman for rootless containers (i.e. you can run a container without any root permissions). subuid/subgid is used to map a range of UID/GIDs to the process namespace inside the kernel. Some details here: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux_atomic_host/7/html-single/managing_containers/index#set_up_for_rootless_containers It's actually pretty cool. So, now when accounts are created with useradd, subuids are assigned to that new user. Unfortunately, this doesn't really work in an enterprise environment when users are defined via LDAP, since no subuid/subgid entries are created, but I've heard that there's an effort to make that happen in the NSS layer in the future. -- Jonathan Billings ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] What is /etc/subuid ?
On 2019-10-09 15:47, Valeri Galtsev wrote: Dear Experts, Could someone enlighten me about the following file: /etc/subuid ? This file appears to be owned by "setup" package. This is CentOS 7 system, and until now these files if existed were never changed. Today I have added user quite routine way, by doing /usr/sbin/groupadd -g 4500 [username] /usr/sbin/useradd -g [username] -u 4500 -c "User Name, email@domain" [username] And the file /etc/subuid changed and user was added into it: [username]:10:65536 Nothing like that was happening before. This is first time I create account after update done on Oct 3, 2019. I checked several CentOS 7 machines, basically doing this: # grep subuid /usr/sbin/useradd Binary file /usr/sbin/useradd matches And CentOS 7 machines indeed may have that file name in the useradd binary. None of CentOS 6 machines has that. I tried to do FreeBSD-ism: man /etc/subuid came empty, and realized that I'm doing FreeBSD-ism. I tried to do search on the web (did not "google", I use duckduckgo... so I "did search"), and came pretty much empty. Is it just me, or indeed something in CentOS 7 indeed changed? And what is it? Another question on the same note: how do we find out what the file is about and is used for in Linux, apart from searching on the web. (When there are surprises like the one I had today, one does like to know what this particular file is used for). Thanks in advance for your answers. A quick google search: https://lmgtfy.com/?qtype=search=%2Fetc%2Fsubuid yielded this as the first link: http://man7.org/linux/man-pages/man5/subuid.5.html -- Mike Burger http://www.bubbanfriends.org "It's always suicide-mission this, save-the-planet that. No one ever just stops by to say 'hi' anymore." --Colonel Jack O'Neill, SG1 ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
[CentOS] What is /etc/subuid ?
Dear Experts, Could someone enlighten me about the following file: /etc/subuid ? This file appears to be owned by "setup" package. This is CentOS 7 system, and until now these files if existed were never changed. Today I have added user quite routine way, by doing /usr/sbin/groupadd -g 4500 [username] /usr/sbin/useradd -g [username] -u 4500 -c "User Name, email@domain" [username] And the file /etc/subuid changed and user was added into it: [username]:10:65536 Nothing like that was happening before. This is first time I create account after update done on Oct 3, 2019. I checked several CentOS 7 machines, basically doing this: # grep subuid /usr/sbin/useradd Binary file /usr/sbin/useradd matches And CentOS 7 machines indeed may have that file name in the useradd binary. None of CentOS 6 machines has that. I tried to do FreeBSD-ism: man /etc/subuid came empty, and realized that I'm doing FreeBSD-ism. I tried to do search on the web (did not "google", I use duckduckgo... so I "did search"), and came pretty much empty. Is it just me, or indeed something in CentOS 7 indeed changed? And what is it? Another question on the same note: how do we find out what the file is about and is used for in Linux, apart from searching on the web. (When there are surprises like the one I had today, one does like to know what this particular file is used for). Thanks in advance for your answers. Valeri Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
[CentOS] Livepatch: Linux kernel updates without rebooting
Hi, I am running CentOS Linux release 7.7.1908 (Core). Does CentOS Linux kernel 3.10.0-1062.1.1.el7.x86_64 support kernel updates without rebooting (Live Patching)? I look forward to hearing from you and thanks in advance. Best Regards, Kaushal ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Glances for CentOS 8?
On 10/8/19 3:16 PM, Stephen John Smoogen wrote: > On Mon, 7 Oct 2019 at 23:08, Wynona Stacy Lockwood wrote: >> >> It seems that glances is not in EPEL for CentOS 8. Is that coming at some >> point, or has it been deprecated in favor of some other tool? > > Hi, > > Because RHEL releases are far apart, packages don't get automatically > added to newer EPEL releases. Instead, packages are usually added > after maintainers get a request through bugzilla. This allows the > packager know that the software is needed and also to see if they have > time to support another branch. > > I don't see the tool being deprecated in Fedora so it should be possible. > > As a Halloween present I have added it to my temp repo: > https://copr.fedorainfracloud.org/coprs/smooge/not-yet-in-epel8/packages/. > These packages are as is. > > > > It whould be nice if there was repo in CentOS called "Unsuported" or something similar, where you would move packages CentOS devs create for personal usage (in copr), so they are all in one place if they are functional. -- Ljubomir Ljubojevic (Love is in the Air) PL Computers Serbia, Europe StarOS, Mikrotik and CentOS/RHEL/Linux consultant ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Centos 7 on Dell Latitude E6500
Hello, On Sat, 12 May 2018 20:55:58 +0200 Rainer Fügenstein wrote: > I tried to install Centos7 x86_64 minimal 1503-01 from an USB > flash drive on my old Dell Latitude E6500 laptop. > > boots up in text mode, switches text resolution, writes: > > Started Show Plymouth Boot Screen > Reached Target Paths > Reached Target Basic System. > > then hangs for some time, eventually starting dracut emergency > shell. log says: > > multipathd: sdb: spurious uevent, path already in pathvec > multipathd: sda: spurious uevent, path already in pathvec > > interesting: > sdb is the internal 240GB kingston SSD drive (existing ntfs bitlocker > partition recognized as sdb1) > > sda is the write protected USB stick, recognised as CDROM drive. > > 4GB rom > intel 45 express chipset > mobile intel GMA 4500MHD graphics > intel 5100AGN wifi > > what to try next? any additional infos I can give you? For the sake of the archives.. I ran into the exact same problem yesterday: trying to install CentOS 7 on a good old Dell Latitude E6500 (the everything-1908 iso set into a USB flashdrive) and no way to boot. Worked around the issue by booting from the LiveGNOME one! Then installed to disk beside Windows and CentOS 6, now everything is fine. Thanks to Rainer for his help, in private. Regards, -- wwp https://useplaintext.email/ pgpOR__ZgUWwO.pgp Description: OpenPGP digital signature ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Centos & media codec
Fabian Thanks for the fast reply. I just installed VLC. :-) On Tue, 2019-10-08 at 07:57 +0200, Fabian Arrotin wrote: > RPMfusion ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
