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Centos 8 Postfix & Cyrus
by Gregory P. Ennis 27 Feb '20

27 Feb '20

Everyone, I have had two e-mail servers running, one with Centos 6 and the other with Centos 7 using sendmail, dovecot, spamassassin, clamd, and cclamav-milter without hardly any problems after the initial setup. My expertise should be considered not much more than beginner or early intermediate. I would like to create a hypervisor with Centos 8 and run a guest Centos 8 with postfix and cyrus. I already have a guest Centos 8 on a Centos 7 hypervisor, and have had difficulty getting cyrus to work. Can anyone refer me to a tutorial on how to get postfix and cyrus to work on centos 8. Everyone seems to imply that postfix is much easier to use, but so far I have not been able to pass the low end of the learning curve. Best recommendations for a tutorial is what I would like to have. Thanks much!!!! Greg Ennis

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anyone know of a list or wiki for GWC?
by Fred Smith 26 Feb '20

26 Feb '20

Hi! totally OT... Hoping there is a mailing list or wiki (or other help forum) for GWC, but haven't found one yet. I'm working on converting a bunch of my LPs to CDs, and am using GWC (Gnome Wave Cleaner, or GTK Wave Cleaner) to clean up the noise. It works great, but I can't figure out how to deal with certain types of pressing flaws that create a thump every time around. Anyone know of such a resource? Thanks in advance! Fred -- ------------------------------------------------------------------------------- .---- Fred Smith / ( /__ ,__. __ __ / __ : / / / / /__) / / /__) .+' Home: fredex(a)fcshome.stoneham.ma.us / / (__ (___ (__(_ (___ / :__ 781-438-5471 -------------------------------- Jude 1:24,25 ---------------------------------

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Re: [CentOS] Encrypted container on CentOS VPS
by fvargas 26 Feb '20

26 Feb '20

Enviado desde mi smartphone Samsung Galaxy. -------- Mensaje original --------De: H <agents(a)meddatainc.com> Fecha: 24/2/20 20:37 (GMT-04:00) A: centos(a)centos.org Asunto: Re: [CentOS] Encrypted container on CentOS VPS On 02/24/2020 05:01 PM, Michael Hennebry wrote:> What is the use-case here?> Are you concerned that the host may change the data or just read it?> Would re-creating the file anew for each use be practical?> What about using the file in an encrypted form?> I'm thinking of the case of records on people.> Separate "cyphers" for first names, last names and other names> would go a long way toward hiding whatever needs to be hidden.>> Keeping the host from reading the data might not be a solvable problem.> Keeping the host from quietly changing the data might be expensive.> If all else fails you might keep copies of the> data on separate hosts and compare their md5sums.> I expect that doing it on your own host has already been deemed a failure.>General prudence as to someone accessing my files._______________________________________________CentOS mailing listCentOS@centos.orghttps://lists.centos.org/mailman/listinfo/centos

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Downgrade Mariadb 10.3 on centos 8 ?
by Ian B 25 Feb '20

25 Feb '20

We've just got a new server running centos 8 and mariadb 10.3.17, so there's no real data loss issues currently on that server. We've also got some older servers running mysql 5.1.7 which can't be upgraded currently. We can't connect to the old mysql servers using libmysqlclient (to be more precise Perl using DBD::mysql which uses that to my understanding). We get a 'handshake error', and digging about it suggests that it's mysql version incompatibilities. Really we need the new servers connecting to the old and vice versa. So I'm wondering how I get around this. Is downgrading Mariadb on Centos 8 the only (or possible) route here ? If so, any idea how we can go about this (I can't seem to find any information on what version would work either)? Happy to explore any other routes, other than changing the old servers currently. Thanks, Ian

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dbus/systemd failure on startup (CentOS 7.7)
by James Pearson 25 Feb '20

25 Feb '20

We are seeing a problem that occurs ~5% of the time when rebooting CentOS 7.7 where systemd gets a 'Connection timed out' to D-Bus just after the D-Bus service starts - from 'journalctl -x' : ... Jan 21 16:09:59 linux7-7.mpc.local systemd[1]: Started D-Bus System Message Bus. -- Subject: Unit dbus.service has finished start-up -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- Unit dbus.service has finished starting up. -- -- The start-up result is done. Jan 21 16:10:24 linux7-7.mpc.local systemd[1]: Failed to register match for Disconnected message: Connection timed out Jan 21 16:10:24 linux7-7.mpc.local systemd[1]: Failed to initialize D-Bus connection: Connection timed out ... This then has a knock-on effect that causes other services to fail - e.g. -- Unit gdm.service has begun starting up. Jan 21 16:10:39 linux7-7.mpc.local dbus[817]: [system] Activating systemd to hand-off: service name='org.freedesktop.login1' unit='dbus-org.freedesktop.login1.service' Jan 21 16:10:50 linux7-7.mpc.local dbus[817]: [system] Failed to activate service 'org.freedesktop.systemd1': timed out Jan 21 16:10:50 linux7-7.mpc.local systemd-logind[1221]: Failed to enable subscription: Failed to activate service 'org.freedesktop.systemd1': timed out Jan 21 16:10:50 linux7-7.mpc.local systemd-logind[1221]: Failed to fully start up daemon: Connection timed out Jan 21 16:10:50 linux7-7.mpc.local systemd[1]: systemd-logind.service: main process exited, code=exited, status=1/FAILURE Jan 21 16:10:50 linux7-7.mpc.local systemd[1]: Failed to start Login Service. -- Subject: Unit systemd-logind.service has failed -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- Unit systemd-logind.service has failed. -- -- The result is failed. Whatever the issue is, it appears that polkit might be involved - if we restart the polkit service, things appear to return to normal (e.g. gdm starts up etc) We can't find any similar reports of this happening elsewhere with CentOS 7.7 - but we were wondering if anyone else had come across a problem like this? Thanks James Pearson

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Nested Virtualization with CentOS 7 host and CentOS 8 guest
by Chris Card 25 Feb '20

25 Feb '20

I'm not sure whether this is a specific CentOS question, but I'm hoping someone here can give me some pointers. I have an OpenStack compute node running CentOS 7.4.1708 and kernel 3.10.0-693.17.1.el7.x86_64 which is configured for nested virtualization; this has been set up for a few years and works fine when running CentOS 7 guests which themselves are using virt-create / virt-customize etc. Nova is set up on the compute node so that guests have cpu mode host-passthrough. I have been trying to run a CentOS 8 guest on the compute node so that I can build CentOS 8 images for OpenStack (there is an issue using a CentOS 7 server to build a CentOS 8 image related to xfs options which are only supported read-only by CentOS 7). However, every time I try to build a CentOS 8 image using a CentOS 8 guest, the CentOS 8 guest crashes with a kernel panic, not immediately but usually near the end of the image build process. (I have also seen similar behaviour using a Fedora 31 guest to build a CentOS 8 image, but the crashes are less frequent, and some image builds have succeeded). The CentOS 8 guest is running CentOS 8.1.1911 (Core) and kernel 4.18.0-147.3.1.el8_1.x86_64. Any ideas?

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Problems with reposync and createrepo on CentOS 7 for RHEL8/CentOS8 repo?
by rainer＠ultra-secure.de 25 Feb '20

25 Feb '20

Hi, I'm trying to mirror the PostgreSQL12 RHEL8 repo: https://download.postgresql.org/pub/repos/yum/12/redhat/rhel-8-x86_64/ [root@cobbler yum.repos.d]# cat pgdg-12-centos8.repo # PGDG Red Hat Enterprise Linux / CentOS stable repositories: [pgdg12-rhel8] name=PostgreSQL 12 for RHEL/CentOS $releasever - $basearch baseurl=https://download.postgresql.org/pub/repos/yum/12/redhat/rhel-8-x86_… enabled=1 gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-PGDG # Source RPMs (SRPM), and their testing repositories: Then I run: reposync --repoid=pgdg12-rhel8 --download_path=/repo/8 createrepo /repo/8/pgdg12-rhel8 However, when I try to install it on the target-server, it just doesn't find the postgresql12 binaries. [root@my-db11-test yum.repos.d]# dnf search postgresql12 Last metadata expiration check: 0:24:06 ago on Mon 24 Feb 2020 11:18:20 AM CET. ==================================================================================================================== Name & Summary Matched: postgresql12 ===================================================================================================================== postgresql12-debugsource.x86_64 : Debug sources for package postgresql12 postgresql12-debuginfo.x86_64 : Debug information for package postgresql12 postgresql12-libs-debuginfo.x86_64 : Debug information for package postgresql12-libs postgresql12-test-debuginfo.x86_64 : Debug information for package postgresql12-test postgresql12-devel-debuginfo.x86_64 : Debug information for package postgresql12-devel postgresql12-pltcl-debuginfo.x86_64 : Debug information for package postgresql12-pltcl postgresql12-plperl-debuginfo.x86_64 : Debug information for package postgresql12-plperl postgresql12-server-debuginfo.x86_64 : Debug information for package postgresql12-server postgresql12-contrib-debuginfo.x86_64 : Debug information for package postgresql12-contrib postgresql12-llvmjit-debuginfo.x86_64 : Debug information for package postgresql12-llvmjit postgresql12-plpython-debuginfo.x86_64 : Debug information for package postgresql12-plpython postgresql12-plpython3-debuginfo.x86_64 : Debug information for package postgresql12-plpython3 ========================================================================================================================= Name Matched: postgresql12 ========================================================================================================================== postgresql12-libs.x86_64 : The shared libraries required for any PostgreSQL clients postgresql12-odbc.x86_64 : PostgreSQL ODBC driver postgresql12-devel.x86_64 : PostgreSQL development header files and libraries postgresql12-llvmjit.x86_64 : Just-in-time compilation support for PostgreSQL postgresql12-plpython.x86_64 : The Python procedural language for PostgreSQL Is there something obvious (or not so obvious) that I forgot?

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OwnCloud vs NextCloud
by H 25 Feb '20

25 Feb '20

I am planning to install either ownCloud or NextCloud on a CentOS 7 VPS server I control. I have previously used ownCloud on another server but have not updated the host application for quite some time. On this new server, I am not sure which one is the "best" and since I am doing a new install I need to decide which one to use. Looking at the Android apps for these cloud solutions, they both seem to have a fair number of critical reviews... Does anyone have a preference and, if so, why?

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tftp server different from dhcp one
by Mauricio Tavares 24 Feb '20

24 Feb '20

In https://docs.centos.org/en-US/centos/install-guide/pxe-server/#chap-install… they show the following example for setting dhcpd.conf to point to the tftp server for pxe booting: option space pxelinux; option pxelinux.magic code 208 = string; option pxelinux.configfile code 209 = text; option pxelinux.pathprefix code 210 = text; option pxelinux.reboottime code 211 = unsigned integer 32; option architecture-type code 93 = unsigned integer 16; subnet 10.0.0.0 netmask 255.255.255.0 { option routers 10.0.0.254; range 10.0.0.2 10.0.0.253; class "pxeclients" { match if substring (option vendor-class-identifier, 0, 9) = "PXEClient"; next-server 10.0.0.1; if option architecture-type = 00:07 { filename "shim.efi"; } else { filename "pxelinux/pxelinux.0"; } } } If the server is a different one, how would the option architecture-type{} change to reflect the file location?

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Mr. Teo En Ming's Guide to Deploying CentOS Web Panel (CWP) Web Hosting Control Panel on Amazon AWS Cloud
by Turritopsis Dohrnii Teo En Ming 23 Feb '20

23 Feb '20

Redundant Links to Teo En Ming's Guide to Deploying CentOS Web Panel (CWP) Web Hosting Control Panel on Amazon AWS Cloud [1] https://lkml.org/lkml/2020/2/23/71 [2] http://lkml.iu.edu/hypermail/linux/kernel/2002.2/08712.html [3] https://marc.info/?l=linux-kernel&m=158246414013004&w=2 [4] http://lists.linuxfromscratch.org/pipermail/lfs-chat/2020-February/029096.h… [5] https://marc.info/?l=apache-httpd-users&m=158246714513728&w=2 [6] https://lists.launchpad.net/maria-discuss/msg05714.html [7] https://marc.info/?l=php-general&m=158246811013917&w=2 -----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), in Taiwan (5 Aug 2019) and Australia (25 Dec 2019 to 9 Jan 2020): [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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