Discuss January 2019

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89 participants
90 discussions

systemd
by Steve Clark 09 Jan '19

09 Jan '19

Hi List, I am trying to understand what After= means in a unit file. Does it mean after the specified target is up and operational or only that the target has been started? I have something that needs postgres but postgres needs to be operational not just started. Sometimes it can take a bit for postgres to become operational. Thanks, Steve

5 7

high kworker CPU usage in 3.10.0-957 w/ Xorg nouveau driver?
by Sean 09 Jan '19

09 Jan '19

Hi all, I have a number of Gnome/X desktop workstations with NVidia GeForce GT 1030 adapters, dual monitors, Core I7 3770 quad-core hyper-threaded CPUs, with 32GB of RAM. Most (haven't checked them all yet) are exhibiting problems that include significant sluggish-ness with mouse movement and typing as well as screen rendering problems happening since upgrading from kernel 3.10.0-862.14.4.el7.x86_64 to 3.10.0-957.1.3.el7.x86_64. The users have seen this behavior after logging into Gnome, but with out any additional applications running (Chrome/Firefox/LibreOffice, etc.). I can see in top that there are multiple kworker processes consuming a large amount of CPU time and unusually high load averages - like 5-7 range on the 5 minute average, normal load average would be between 1-2 for these users. At one point, while troubleshooting with a user, I was logged in remotely while the user was working on the desktop when it became completely unresponsive. /var/log/messages had nouveau messages like: kernel: nouveau: evo channel stalled kernel: nouveau 0000:01:00.0: disp: chid 1 mthd 0000 data 00000000 10003000 00000000 kernel: nouveau 0000:01:00.0: DRM: base-1: timeout kernel: nouveau 0000:01:00.0: DRM: core notifier timeout Those messages might be meaningless, but they are abundant in the logs. For grins before rebooting, I attempted to stop and start GDM. Both operations seemed successful, I verified all processes owned by the user were gone, and asked him to log in again, but he reported his screens still looked like they did before I restarted GDM and that he didn't have a login screen. Users are currently booting their systems to the 3.10.862 kernel, and this problem does not present itself. I can also add that running the proprietary nvidia driver (from nvidia.com, not elrepo) version 410.78 does not produce this problem. I config manage all these desktops with Puppet and they were all built from by the same kickstart file. The nvidia driver is not purposefully managed by puppet, I just happened to be experimenting with it on my workstation. Before I load the proprietary driver on all the problematic systems, I was hoping someone on the list might have some insight or suggestions. Thanks! --Sean

1 0

NFS deny access
by Thomas Plant 09 Jan '19

09 Jan '19

Hello all, I have an NFS Server where I want give access to a specific address to a specific path. Problem is that I have some other shares active which I do not want the specific IP to not access it. The /etc/exports looks like the following: /nfs/Share1 10.10.*(rw) /nfs/Share2 10.10.*(rw) /kdnbckp/CS21 10.10.193.43(rw) The client on the last line (IP 10.10.193.43) I'd like to exclude from mounting the first two shares. How can I do this? 'man exports' does not give any hint if this is possible. Thanks, Thomas

2 1

Squashfs as rootfs
by Marcin Trendota 09 Jan '19

09 Jan '19

Hello. I'm trying to add option to grub menu (amongst other options) to boot from squashfs image. But 'root=live:/path/tofile' doesn't work. I didn't find anything useful on the internet. Anybody can point me in right direction? Maybe better choice is to replace grub with isolinux? I have working solution with iso with squashfs booting through PXE, but i don't know how to do this in grub. TIA -- Marcin Trendota

1 0

How do I remove a kernel
by Robert Moskowitz 09 Jan '19

09 Jan '19

I have 4 kernels in /boot, leaving on 20MB which is not enough for the next one. I had installonly_limit= set at 5, as there were some kernel problems. After I got the error that there was not enough room for another kernel, I set installonly_limit= to 3 and did the update with --exclude=kernel* That worked to update everything else, but not remove the oldest kernel. How can I remove the oldest kernel to make room for the new one? thanks

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January 2019 community newsletter published
by Rich Bowen 08 Jan '19

08 Jan '19

The January 2019 community newsletter has now been published to the blog, at https://blog.centos.org/2019/01/centos-pulse-newsletter-january-2019-1901/ Thanks to everyone that helped get that put together. If you'd like to contribute to the February newsletter, please drop by the centos-promo list to get started! --Rich -- Rich Bowen - rbowen(a)redhat.com @CentOSProject // @rbowen 859 351 9166

1 0

copy with bunzip2?
by Frank Cox 08 Jan '19

08 Jan '19

I have several pdf files as .pdf.bz2, as seen here: a/1.pdf.bz2 a/2.pdf.bz2 a/b/3.pdf.bz2 a/b/c/4.pdf.bz2 I want to copy everything in and under directory a to another computer, but I want the files to be decompressed on the destination machine: a/1.pdf a/2.pdf a/b/3.pdf a/b/c/4.pdf I could just use rsync and run a bunch of bunzip2 commands on the destination after the copying is completed, but perhaps there's a better way that would decompress the files in transit instead? -- MELVILLE THEATRE ~ Real D 3D Digital Cinema ~ www.melvilletheatre.com

2 1

Re: [CentOS] has anyone a working example for a ks.cfg with two disks?
by Ralf Prengel 08 Jan '19

08 Jan '19

Hallo, this version is working here now. Ralf bootloader --append=" crashkernel=auto" --location=mbr --boot-drive=sda # Partition clearing information clearpart --all --initlabel --drives=sda,sdb # Disk partitioning information part / --fstype="ext4" --ondisk=sda --grow --size=1 part swap --fstype="swap" --ondisk=sda --size=8192 part /mnt/platte02 --fstype="ext4" --ondisk=sdb --size=1 --grow

1 0

Re: [CentOS] has anyone a working example for a ks.cfg with two disks?
by Ralf Prengel 08 Jan '19

08 Jan '19

Zitat von Jack Bailey <jack(a)internetguy.net>: > Here's one of my kickstarts: > > zerombr > clearpart --all --initlabel --drives=$1,$2 Hallo, thanks but dowsn t work here. The installer doesn t accept $1 Ralf

1 0

has anyone a working example for a ks.cfg with two disks?
by Ralf Prengel 08 Jan '19

08 Jan '19

Hallo, has anyone a working example for a ks.cfg with two disks? disk sda swap and / disk sdb /mnt/disk02 I found several ks.cfg examples but none is working here. Centos 7.6 is in use. Thanks Ralf

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Discuss January 2019