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Re: [CentOS] How to Load Custom CentOS 7 Image
by Xinhuan Zheng 20 May '20

20 May '20

Dear Earl Ramirez, >I created a custom ISO a couple of years ago [0], you can use it as >your base of one of the following links[1-4], should be sufficient to >get you started. >[0] https://github.com/EarlRamirez/snipeit_iso In above github project, in https://github.com/EarlRamirez/snipeit_iso/blob/master/isolinux/grub.conf file, there is ‘@‘ symbol for splashimage, and for kernel, @KERNELPATH@, @ROOT@, etc. Will those be replaced by actual values? Where do actual values come from? How does actual values substitute those variables? Thanks again, - Xinhuan

2 1

Transparent Squid and FirewallD : fine-tuning question
by Nicolas Kovacs 19 May '20

19 May '20

Hi, I just setup a very basic HTTP proxy with Squid on a router running CentOS 7. Up until early 2020 I've been using a bone-headed shell script with iptables to configure my firewall. But I decided to follow advice from a few gurus on this list, and I've since moved my configurations to FirewallD, which works nicely. There's one configuration left to tackle, that's port redirection for the Squid proxy server. Which also works fine, though I'd like to figure out a little detail. Here goes. My router has two network interfaces, which I've aptly named WAN and LAN in the NetworkManager configuration: $ nmcli con show NAME UUID TYPE DEVICE WAN 9574b606-8f6d-3edc-95ad-8165df0f3fce ethernet enp2s0 LAN c726b168-1fcd-4dc5-a01d-8ad8a1ba38ee ethernet enp3s1 Squid is acting as a transparent proxy server: $ sudo grep http_port /etc/squid/squid.conf http_port 3128 transparent In my firewall configuration, all requests to port 80 (HTTP) are redirected to port 3128: $ sudo firewall-cmd --permanent --add-forward-port=port=80:proto=tcp:toport=3128:toaddr=192.168.3.1 $ sudo firewall-cmd --reload $ sudo firewall-cmd --list-all internal (active) target: default icmp-block-inversion: no interfaces: enp3s1 sources: services: dhcp dns http squid ssh ports: protocols: masquerade: no forward-ports: port=80:proto=tcp:toport=3128:toaddr=192.168.3.1 source-ports: icmp-blocks: rich rules: In the current state, this configuration works as expected. When a client desktop in the 192.168.3.0/24 network browses HTTP sites on the web, it appears in the Squid log on the server in /var/log/squid/access.log. And here comes the question. How can I redirect all HTTP requests to port 3128 EXCEPT THOSE THAT ARE DIRECTLY AIMED AT THE PROXY SERVER? Here's the thing. The proxy server (amandine.sandbox.lan) is also running httpd to display a static information page for the local network. Now client desktops can access http://amandine.sandbox.lan in a web browser just fine. But this still goes through the proxy, and I'd like these requests to rather be handled directly. In iptables syntax this would vaguely look like this: $ iptables -A PREROUTING -t nat -i 192.168.3.1 -p tcp \ ! -d 192.168.3.1 --dport 80 -j REDIRECT --to-port 3128 How can I translate the "! -d 192.168.3.1" part into some FirewallD-specific syntax ? Cheers from the sunny South of France, Niki -- Microlinux - Solutions informatiques durables 7, place de l'église - 30730 Montpezat Site : https://www.microlinux.fr Mail : info(a)microlinux.fr Tél. : 04 66 63 10 32 Mob. : 06 51 80 12 12

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Centos8.1 Plymouthd crash 913: ply_event_loop_watch_for_timeout: Assertion `seconds > 0.0' failed.
by LAHAYE Olivier 18 May '20

18 May '20

Hi, I’m running a special initrd generated for SystemImager with a special dracut module that relies on plyouth scripted theme. It works perfectly on CentOS-6, CentOS-7, OpenSUSE-42.3, Fedora-29 (not tested later) and used to work on CentOS-8.0 Since CentOS-8.1 was released, IT chrashes with the following error: Plymouthd crash 913: ply_event_loop_watch_for_timeout: Assertion `seconds > 0.0' failed. I’m running quemu 5.0.0 with tianocore UEFI bios on MacOS (using accel=none or accel=hvf) (Bug also occurs with standard 256k bios) When I strace, I see multiple reasons but I can’t tell wich one is fatal. 1/ plymouthd reads /etc/Plymouth/plymouthd.conf (ok), then tries to read them from /var/run/plymouth/themes/<themename> instead of /usr/share/plymouth/themes/<themename>/ . As it fails it tries to read /var/run/plymouth/plymouthd.defaults (fails) then /usr/share/plymouth//plymouthd.defaults (ok) then it tries to read the theme /var/run/plymouth/themes/<themename>/<themename>.plymouth (fails) but never tries to read in from /usr/share/plymouth/themes/<themename>/<themename.plymouth> ??? It still continues 2/ After a few things, it tries to read /sys/devices/virtual/drm/ttm/uevent (ok) and the it tries to read /run/dev/data/+drm:ttm (fail). Is it expectable or does this means a problem like a missing udev rule or a boch driver bug or something else? 3/ Same as step 2 4/ Crash with @lymouthd: ply-event-loop.c:913: ply_event_loop_watch_for_timeout: Assertion `seconds > 0.0' failed. I’ve reported this in Centos-8.1 with no return and then RedHat-8.1 today. RedHat 8.1 bug report: https://bugzilla.redhat.com/show_bug.cgi?id=1836828 CentOS-8.1 bug report: https://bugs.centos.org/view.php?id=17140 Any idea where I could look for? More likely a plymouth bug or an udev missing rule or something else? (full dmesg and strace log in bug reports) Thanks a lot for any tips. PS: looking at google results, the only things I can find are very old bugs without resolution (not fixed and obsoleted due to new OS release) -- Olivier LAHAYE

1 0

Live Patching Upgrade CentOS 7
by Xinhuan Zheng 18 May '20

18 May '20

Dear All, Does anyone know how to to live patching upgrade of CentOS 7 without rebuilding the whole boot volume? I have enough disk space in Boot volume. I don’t want to go through creating a new VM and install CentOS 7 patch release. Thanks, - Xinhuan

1 0

kvm: C8 as guest on C6 host / huge delay while booting
by Leon Fauster 18 May '20

18 May '20

Since C8.1 kvm guests have a huge delay while booting on a kvm host based on C6. This delay was not present with C8.0. The "pause" happend direct after the grub step. The VNC session shows only a "_" character. Any ideas what changes? -- Leon

3 4

Missing announcement for the latest kernel
by David Hrbáč 18 May '20

18 May '20

Hi, It seems that kernel-2.6.32-754.29.2 has not been announced on the maillist. https://access.redhat.com/errata/RHSA-2020:2103 Regards, DH

1 0

Stuck Centos 7 to 8 upgrade
by Frank M. Ramaekers Jr. 16 May '20

16 May '20

Four problems below: # dnf -y groupupdate "Core" "Minimal Install" bintray-tvheadend-stable 0.0 B/s | 0 B 00:00 Failed to synchronize cache for repo 'bintray-tvheadend-stable', ignoring this repo. Last metadata expiration check: 0:03:11 ago on Sat 16 May 2020 12:30:47 PM CDT. Error: Problem 1: package python3-hawkey-0.35.1-9.el8_1.x86_64 requires librpm.so.8()(64bit), but none of the providers can be installed - package python3-hawkey-0.35.1-9.el8_1.x86_64 requires librpmio.so.8()(64bit), but none of the providers can be installed - package python3-dnf-plugins-core-4.0.8-3.el8.noarch requires python3-hawkey >= 0.34.0, but none of the providers can be installed - cannot install both rpm-libs-4.14.2-26.el8_1.x86_64 and rpm-libs-4.11.3-43.el7.x86_64 - package dnf-plugins-core-4.0.8-3.el8.noarch requires python3-dnf-plugins-core = 4.0.8-3.el8, but none of the providers can be installed - package deltarpm-3.6-3.el7.x86_64 requires librpm.so.3()(64bit), but none of the providers can be installed - package deltarpm-3.6-3.el7.x86_64 requires librpmio.so.3()(64bit), but none of the providers can be installed - conflicting requests - problem with installed package deltarpm-3.6-3.el7.x86_64 Problem 2: package python3-rhn-client-tools-2.8.16-13.module_el8.1.0+211+ad6c0bc7.x86_64 requires libgudev, but none of the providers can be installed - package python3-dnf-plugin-spacewalk-2.8.5-11.module_el8.1.0+211+ad6c0bc7.noarch requires python3-rhn-client-tools >= 2.8.4, but none of the providers can be installed - package libgudev-232-4.el8.i686 obsoletes libgudev1 < 230 provided by libgudev1-219-73.el7_8.6.x86_64 - package libgudev-232-4.el8.x86_64 obsoletes libgudev1 < 230 provided by libgudev1-219-73.el7_8.6.x86_64 - package dnf-plugin-spacewalk-2.8.5-11.module_el8.1.0+211+ad6c0bc7.noarch requires python3-dnf-plugin-spacewalk = 2.8.5-11.module_el8.1.0+211+ad6c0bc7, but none of the providers can be installed - package libgudev1-devel-219-73.el7_8.6.x86_64 requires libgudev1 = 219-73.el7_8.6, but none of the providers can be installed - conflicting requests - problem with installed package libgudev1-devel-219-73.el7_8.6.x86_64 Problem 3: package python3-dnf-4.2.7-7.el8_1.noarch requires dnf-data = 4.2.7-7.el8_1, but none of the providers can be installed - package dnf-4.2.7-7.el8_1.noarch requires python3-dnf = 4.2.7-7.el8_1, but none of the providers can be installed - cannot install both dnf-data-4.2.7-7.el8_1.noarch and dnf-data-4.0.9.2-1.el7_6.noarch - package yum-4.2.7-7.el8_1.noarch requires dnf = 4.2.7-7.el8_1, but none of the providers can be installed - package python2-dnf-4.0.9.2-1.el7_6.noarch requires dnf-data = 4.0.9.2-1.el7_6, but none of the providers can be installed - conflicting requests - problem with installed package python2-dnf-4.0.9.2-1.el7_6.noarch Problem 4: problem with installed package ipa-client-4.6.6-11.el7.centos.x86_64 - package ipa-client-4.6.6-11.el7.centos.x86_64 requires libcollection.so.2()(64bit), but none of the providers can be installed - package ipa-client-4.8.0-10.module_el8.1.0+255+aa2bdb39.x86_64 requires libxmlrpc_util.so.4()(64bit), but none of the providers can be installed - cannot install both libcollection-0.7.0-39.el8.x86_64 and libcollection-0.7.0-32.el7.x86_64 - cannot install both xmlrpc-c-1.51.0-5.el8.x86_64 and xmlrpc-c-1.32.5-1905.svn2451.el7.x86_64 - package sssd-kcm-2.2.0-19.el8_1.1.x86_64 requires libcollection.so.4()(64bit), but none of the providers can be installed - package libreport-plugin-mantisbt-2.1.11-53.el7.centos.x86_64 requires libxmlrpc_util.so.3()(64bit), but none of the providers can be installed - conflicting requests - problem with installed package libreport-plugin-mantisbt-2.1.11-53.el7.centos.x86_64 - package ipa-client-4.8.0-11.module_el8.1.0+253+3b90c921.x86_64 is excluded - package ipa-client-4.8.0-13.module_el8.1.0+265+e1e65be4.x86_64 is excluded (try to add '--allowerasing' to command line to replace conflicting packages or '--skip-broken' to skip uninstallable packages) Ideas? -Frank

2 1

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

5 8

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

1 0

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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