Discuss May 2020

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98 participants
74 discussions

CentOS 7 - xfs shrink & expand
by Frank M. Ramaekers Jr. 16 May '20

16 May '20

I'm having some difficulty finding a method to shrink my /home to expand my /. They both correspond to LVMs. It is my understanding that one cannot shrink a xfs filesystem. One must back it up (xfsdump), remove (lvremove) redefine it and then restore it back (xfsrestore). Okay, I'm running into a problem where /home needs to be "unused". If tried going in to "maintance mode", but I ran into a problem with the mount command (after issuing a 'chroot /sysroot'). I then tried using SystemRescueCD to boot to, but it wouldn't mount my 32TB RAID USB drive (something about too big). Any thoughts or suggestions? -Frank

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CentOS 8 latest sssd src RPM
by Juan Jose Villaplana Querol 16 May '20

16 May '20

Hi, I can find latest sssd RPM at http://mirror.centos.org/centos/8.1.1911/BaseOS/x86_64/os/Packages/sssd-2.2…, but I can't find his source RPM at http://vault.centos.org/8.1.1911/BaseOS/Source/SPackages/ ( https://centos.pkgs.org/8/centos-baseos-x86_64/sssd-2.2.0-19.el8_1.1.x86_64… ) Is there something wrong with latest sssd src RPM? I have also noticed that retrieving src rpms via 'dnf download --source' doesn't work with the default CentOS-Sources.repo configuration. This has been reported here: https://bugs.centos.org/view.php?id=17120 Best regards, Juanjo -- Juan José Villaplana Querol/Servei d'Informàtica/Universitat Jaume I

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Create Virtualbox image from running system?
by Frank Cox 16 May '20

16 May '20

I see that Microsoft has a utility that (apparently) can read a running system and create an image that can then be imported and run on Virtualbox. https://docs.microsoft.com/en-us/sysinternals/downloads/disk2vhd "You can even have Disk2vhd create the VHDs on local volumes, even ones being converted (though performance is better when the VHD is on a disk different than ones being converted)." Is there anything that does the same thing for Linux, and can image a system like that while it's actually running? -- Can we uninstall 2020 and install it again? This one has a virus. MELVILLE THEATRE ~ Real D 3D Digital Cinema ~ www.melvilletheatre.com

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Ailing MATE desktop
by Robert G (Doc) Savage 16 May '20

16 May '20

I need some C8 troubleshooting help with MATE. I'm building a ZFS storage server with a SuperMicro H11SSL motherboard, EPYC 7232 CPU, and 32 GB ECC SDRAM. I installed CentOS 8.1.1911 from the iso as soon as it was released. I'm using the on-board ASPEED VGA video. I installed MATE v1.22 from https://copr.fedorainfracloud.org/coprs/stenstorp/MATE/. The following packages are installed: libmateweather-data-1.24.0-2.el8.noarch libmatemixer-1.24.0-1.el8.x86_64 mate-desktop-libs-1.24.0-3.el8.x86_64 mate-terminal-1.24.0-2.el8.x86_64 mate-themes-3.22.21-1.el8.noarch mate-panel-libs-1.22.2-1.el8.x86_64 mate-desktop-1.24.0-3.el8.x86_64 mate-settings-daemon-1.22.1-2.el8.x86_64 mate-polkit-1.24.0-2.el8.x86_64 mate-notification-daemon-1.22.1-1.el8.x86_64 mate-media-1.24.0-2.el8.x86_64 mate-power-manager-1.22.2-1.el8.x86_64 mate-system-log-1.22.2-2.el8.x86_64 libmateweather-1.24.0-2.el8.x86_64 libmatekbd-1.24.0-1.el8.x86_64 mate-utils-common-1.22.2-2.el8.noarch mate-disk-usage-analyzer-1.22.2-2.el8.x86_64 mate-user-guide-1.24.0-1.el8.noarch mate-menus-preferences-category-menu-1.24.0-2.el8.x86_64 mate-dictionary-1.22.2-2.el8.x86_64 mate-menus-1.24.0-2.el8.x86_64 mate-session-manager-1.24.0-1.el8.x86_64 mate-backgrounds-1.24.0-1.el8.noarch mate-search-tool-1.22.2-2.el8.x86_64 mate-panel-1.22.2-1.el8.x86_64 mate-system-monitor-1.24.0-1.el8.x86_64 mate-applets-1.24.0-2.el8.x86_64 mate-control-center-1.22.2-2.el8.x86_64 mate-icon-theme-1.24.0-1.el8.noarch mate-control-center-filesystem-1.22.2-2.el8.x86_64 mate-menus-libs-1.24.0-2.el8.x86_64 mate-user-admin-1.5.1-3.el8.x86_64 mate-calc-1.24.0-2.el8.x86_64 mate-screenshot-1.22.2-2.el8.x86_64 mate-screensaver-1.24.0-2.el8.x86_64 About two weeks ago following a reset, after a normal login an incomplete MATE desktop appeared. The background is black. There is no visible mouse, although there is some ghostly pixel movement in the top toolbar when what should be the mouse cursor floats over each of those toolbar icons. I can hit Enter and start whatever app the ghost cursor is over, and the mouse works only within that app's window. I'm a long-time user of MATE ever since GNOME3 was released, but until now I've never had any problems with it. I have no idea where to start troubleshooting. I've looked in journalctl, systemctl, and dmesg, but found nothing obvious. There's nothing in the MATE wiki to help. I'm open to any suggestions where to start looking. --Doc Savage Fairview Heights, IL

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Can't move to Centos 8
by david 15 May '20

15 May '20

Folks I've been trying to convert my systems to Centos 8, seeing the EOL on the horizon a few years away. One of my systems is a Mac-Mini, and support for that has been discontinued. I'm wondering what the community suggests among these alternatives: 1) Stay with Centos 7 even after EOL hoping market pressures will add Mac-Mini support 2) Spend a few hundred dollars on a small, **quiet** replacement (ugh) 3) Convert to the Debian/Ubuntu distro. 4) Hope someone figures out a solution. By the way, the same issue exists, I believe, also for other Mac products, such as the newer laptops and servers. David

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CentOS 8 Client to Windows file share SSO Active Directory
by DHilsbos＠performair.com 15 May '20

15 May '20

All; My Google foo is failing me, and searching through the last 10 months on this mailing list hasn't helped either. We have an existing Active Directory domain set up, and I'd like to add a CentOS 8 Workstation to it. I have experience using both realmd and manual configuration to allow local login with AD accounts to various Linux distribution, and have this working on my test system. I used realmd this time, and it configured sssd. I have one problem that I've never been able to solve; when I attempt to connect to a remote file server, while logged on to the CentOS 8 system using a domain account, it asks for credentials. Theoretically, this should work as it's just Kerberos. Can anyone point me at resources on what is needed for SSO to domain resources to work properly? This may be related to another issue that I'm seeing; I don't see the CentOS 8 user logon event (event ID 4624) on the Domain Controller. I see lots of logon events for the computer account, but none for the user account. Thank you, Dominic L. Hilsbos, MBA Director - Information Technology Perform Air International Inc. DHilsbos(a)PerformAir.com www.PerformAir.com

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Re: [CentOS] Can't move to Centos 8
by Mauricio Tavares 15 May '20

15 May '20

On Thu, May 14, 2020 at 1:46 AM Kenneth Porter <shiva(a)sewingwitch.com> wrote: > > --On Wednesday, May 13, 2020 8:22 PM -0400 Mauricio Tavares > <raubvogel(a)gmail.com> wrote: > > > 1) Have you considered moving the storage business to another host so > > not to have a single point of failure? > > 2) Would a $60 Raspberry Pi 4GB be a good replacement? 2 USB3 ports > > and 1 GB ether port. My Synology storage appliance thingie is much > > dumber than that and has not missed a beat in years. > > I'm using CentOS 7 and 8 for internal servers but use OpenWrt on a consumer > router to do the fancy traffic balancing with the "cake" traffic control > module, something the old kernel in CentOS 7 lacks. > Funny you mentioned the OpenWrt: I have been using one as access point and realized I not only forgot how to but cannot find info (I remember seeing it years ago) on how to run the 2.4 and 5GHz as separate networks. Well, I can't even get the internal dhcp to work, having to forward all that to my bind/dhcp vm guest. Shame on me, as if I get that working I can then think on putting a vpn between wireless and internal networks which is something I really should be doing. > I'm running an email server with Dovecot IMAP, Spamassassin, and ClamAV and > that's a bit of a load so I suspect a Pi would be underpowered for that. > I really think it depends on the load, and only you have access to the performance info to answer that. There are people running all that in docker containers (I could swear I read about an "official" or "officially blessed" postfix container in the postfix mailing list).

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How to Load Custom CentOS 7 Image
by Xinhuan Zheng 14 May '20

14 May '20

Dear All, I want to create a CentOS 7 VMWARE VM. I need to install various Runtime libraries, e.g., Tomcat, into the VM. Once all looks good, then I want to make a Custom Image of the entire VM. Later I want to load this Custom Image to a physical HW, so that I don’t need to go through all kinds Runtime installation. Does anyone know how to handle creating a Custom Image and Load to physical HW process? How does boot loader work when VM vs Physical HW has different devices? Thank you, - Xinhuan

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Default ACL inheritance question
by James Pearson 14 May '20

14 May '20

A bit of a minor off-topic issue, but on the off-chance that someone understands how ACLs work ... I've been trying to see if using default ACLs would help with the following issue: I have a third party application that is running as a non-root user ('user-a') and creating log files with mode 0600 (read/write only to the owner) in a log directory I have another application that runs as another non-root user ('user-b') that needs to read the log files created by 'user-a' I can't change the mode of the log files generated by 'user-a', but I thought I could add a default ACL to the log file's parent directory that gave read access to 'user-b' - i.e. something like: % sudo setfacl -d -m u:user-b:r logdir % getfacl logdir # file: logdir # owner: user-a # group: user-a user::rwx group::r-x other::r-x default:user::rwx default:user:user-b:r-- default:group::rwx default:mask::rwx default:other::r-x Now when new log files are created in logdir, the default ACL is inherited, but 'user-b' still can't read the files - i.e. % getfacl logdir/logfile # file: logdir/logfile # owner: user-a # group: user-a user::rw- user:user-b:r-- #effective:--- group::rwx #effective:--- mask::--- other::--- i.e. the effective access for 'user-b' is '---' - which is no access to read for 'user-b' I'm not sure where 'effective' comes from? If I now explicitly add a read ACL for user-b to logdir/logfile: % sudo setfacl -m u:user-b:r logdir/logfile % getfacl logdir/logfile # file: logdir/logfile # owner: user-a # group: user-a user::rw- user:user-b:r-- group::rwx mask::rwx other::--- and 'user-b' can read logdir/logfile I guess I'm missing something on how default ACLs are meant to work - can anyone explain what is happening here or point me in the right direction ? I've actually 'solved' the issue with a suitable sudoers rule that allows 'user-b' to run the required command as 'user-a', but I would like to find out why this default ACL method doesn't work Thanks James Pearson

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CentOS 8 updates
by Bill Maidment 13 May '20

13 May '20

Hi Is it my imagination/impatience, but I don't seem to have received any updates to CentOS 8 recently. I'm thinking particularly of firefox which was updated in CentOS 7 for a critical security update. Is there a backlog of CentOS 8 updates behind the 8.2 release? I noticed on a few occasions that my local mirroring had picked up and later deleted a lot of "tmp" files for CentOS 8, is that an indication that something is on the way? I understand that everyone is struggling with Covid19 restrictions, so just tell me to get back into my isolation if I'm just a bit too impatient. -- Cheers Bill

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Discuss May 2020