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OT Help: Zoneminder
by TE Dukes 15 Oct '21

15 Oct '21

Sorry for the off topic post but I have run out of options an hoping someone here can help. I have been running Zoneminder for a very long time. Its had its bumps in the road as anything else but generally works well. Currently running Zoneminder 1.36.8 on CentOS 7 . The problem started back in June after an upgrade. When events are played back, the first one plays fine, then it's a blur as in the faster than light drive kicks in. Supposedly, there is supposed to be some kind of pause between event playback that keeps this from happening. I posted this issue on their forum, https://forums.zoneminder.com/viewtopic.php?f=43&t=30955&p=122258#p122258 and on their Github, https://github.com/ZoneMinder/zoneminder/issues/3359 but have had no replies. There is a similar issue on github back in 2015, but the file in question has been changed since that time. I have thought about uninstalling and re-installing the version that was working prior to the upgrade but I don't think its Zoneminder. I think it could be something else causing the problem. The problem occurs when playing back events using Firefox and Edge on a Win10 PC and it does the same playing back events with Firefox on the server itself. TIA

2 1

JOB | DBA (Mongo + Sybase)
by James Tobin 14 Oct '21

14 Oct '21

Hello, we are working with an employer that is looking to hire someone capable of managing Mongo and Sybase databases for their office in Canada. Consequently, I had hoped that some members of this list may like to discuss further. Kind regards, James

1 0

MATE 1.20 test build for CentOS 7 available
by Greg Bailey 14 Oct '21

14 Oct '21

Hi everyone, There's been discussions in the past about updating MATE RPMs in EPEL-7: https://bugzilla.redhat.com/show_bug.cgi?id=1436260 https://lists.centos.org/pipermail/centos/2019-August/173154.html (and lots of others...) As a proof-of-concept, I've written some scripts that clone specific commits from the Fedora master branches, and then runs a tool to re-apply RPM scriptlets that are required by EL7 but removed from the Fedora .spec files. The scripts are available at: https://github.com/gebailey/mate-rpms/tree/master/1.20/el7 There's also instructions there if you want to try upgrading to MATE 1.20 w/o rebuilding them yourself. If these packages work for others, perhaps we can revisit the idea of updating the epel7 branches of the Fedora git repos and submitting an official update. There's nothing here (yet) about building MATE 1.22 (which might require a newer gcc for EL7), or building anything on CentOS 8, but thought the CentOS 7 users might find this helpful. -Greg

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Boot time in wtmp is not correct
by Hooton, Gerard 13 Oct '21

13 Oct '21

When I do who -b; uptime I get system boot 2021-10-12 17:05 16:36:09 up 30 min, 1 user, load average: 0.00, 0.00, 0.00 As you can see the boot time reported by the last command is ahead. I have noted it is one hour ahead after a reboot. I have checked the system time in the BIOS before booting Linux and it is correct. -- Gerard Hooton.

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nftables not working (missing kernel modules?)
by Kees de Jong 12 Oct '21

12 Oct '21

It seems like I'm missing some modules or something? I can't seem to load the default /etc/nftables/main.nft on my CentOS 8 ISO. I get the following errors: ``` nft -f /etc/nftables/main.nft /etc/nftables/main.nft:21:6-22: Error: Could not process rule: Operation not supported set allowed_protocols { ^^^^^^^^^^^^^^^^^ /etc/nftables/main.nft:21:6-22: Error: Could not process rule: No such file or directory set allowed_protocols { ^^^^^^^^^^^^^^^^^ /etc/nftables/main.nft:27:6-23: Error: Could not process rule: Operation not supported set allowed_interfaces { ^^^^^^^^^^^^^^^^^^ /etc/nftables/main.nft:27:6-23: Error: Could not process rule: No such file or directory set allowed_interfaces { ^^^^^^^^^^^^^^^^^^ /etc/nftables/main.nft:33:6-23: Error: Could not process rule: Operation not supported set allowed_tcp_dports { ^^^^^^^^^^^^^^^^^^ /etc/nftables/main.nft:33:6-23: Error: Could not process rule: No such file or directory set allowed_tcp_dports { ^^^^^^^^^^^^^^^^^^ /etc/nftables/main.nft:40:3-37: Error: Could not process rule: No such file or directory ct state established,related accept ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ /etc/nftables/main.nft:42:3-40: Error: Could not process rule: No such file or directory meta l4proto @allowed_protocols accept ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ /etc/nftables/main.nft:43:3-36: Error: Could not process rule: No such file or directory iifname @allowed_interfaces accept ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ /etc/nftables/main.nft:44:3-38: Error: Could not process rule: No such file or directory tcp dport @allowed_tcp_dports accept ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ /etc/nftables/main.nft:53:3-41: Error: Could not process rule: No such file or directory reject with icmpx type port-unreachable ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ``` After loading some modules, the errors are reduced to just one. ``` nf_defrag_ipv6 nf_defrag_ipv4 nft_ct nf_conntrack nf_tables_set nf_tables nfnetlink ``` What could I still be missing here? Is there a way to simply get full support to do firewalling in these cases? ``` nft -f /etc/nftables/main.nft /etc/nftables/main.nft:53:3-41: Error: Could not process rule: No such file or directory reject with icmpx type port-unreachable ``` -- Kees de Jong | Supercomputing | https://www.surf.nl/en/about-surf OpenPGP fingerprint: 0x0E45C98AB51428E6

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Re: [CentOS] C7: NM and changing MAC addresses
by José María Terry Jiménez 12 Oct '21

12 Oct '21

El 11/10/21 a las 13:00, Tom Yates escribió: > On Mon, 11 Oct 2021, José María Terry Jiménez wrote: > >> Hello >> >> Perhaps the solution is this: >> >> https://access.redhat.com/solutions/70215HWADDR= > > thanks, but either that link is broken, or the site requires a login, > as i can't see anything and get redirected to a general search page. > could i trouble you to check the link? > > Uh oh! Some copypaste at the end Is this one https://access.redhat.com/solutions/70215 Checked I'm not logged into RH

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C7: NM and changing MAC addresses
by Tom Yates 11 Oct '21

11 Oct '21

i need a way to stop anything from changing my external MAC address, as my ISP is extremely sensitive to additional MAC addresses appearing on my external NIC. i have done sudo nmcli conn mod eno1 802-3-ethernet.cloned-mac-address permanent and it's improved matters, but here's an example of it going wrong even so, from "tcpdump -n -n -e -i eno1 src 185.219.108.121" (which is my ipv4): 10:23:58.210653 ac:1f:6b:6c:5a:6e > bc:30:5b:f7:3e:c8, ethertype IPv4 (0x0800), length 114: 185.219.108.121.53002 > 198.252.206.25.443: Flags [P.], seq 2018:2066, ack 5333, win 501, options [nop,nop,TS val 4035938817 ecr 1709670339], length 48 10:23:58.405154 ac:1f:6b:6c:5a:6e > bc:30:5b:f7:3e:c8, ethertype IPv4 (0x0800), length 66: 185.219.108.121.44534 > 216.58.212.234.443: Flags [.], ack 21641, win 501, options [nop,nop,TS val 805137946 ecr 1062125308], length 0 10:23:58.447030 ac:1f:6b:6c:58:2d > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), length 60: Request who-has 185.219.108.1 tell 185.219.108.121, length 46 10:23:58.447466 ac:1f:6b:6c:58:2d > bc:30:5b:f7:3e:c8, ethertype IPv4 (0x0800), length 342: 185.219.108.121.68 > 185.219.108.1.67: BOOTP/DHCP, Request from ac:1f:6b:6c:58:2d, length 300 10:23:58.629131 ac:1f:6b:6c:5a:6e > bc:30:5b:f7:3e:c8, ethertype IPv4 (0x0800), length 98: 185.219.108.121 > 8.8.8.8: ICMP echo request, id 105, seq 67, length 64 note the first two frames coming from ac:1f:6b:6c:5a:6e, the real MAC address, which has been happily all over the headers of the previous several thousand frames, but then two frames from ac:1f:6b:6c:58:2d, which *utterly* screw up my connection to my ISP. the old MAC address continues to be on some of the outgoing traffic. i have some grounds for thinking that the first or second frame with the "bad" mac address is always a BOOTP/DHCP frame, so i'm open to the idea that this is dhclient being "helpful", rather than NM. does anyone have any idea which daemon or service is responsible for this MAC-rebadging, and/or how i might stop it? -- Tom Yates - https://www.teaparty.net

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Postfix and virtual mail boxes.
by Rob Kampen 11 Oct '21

11 Oct '21

Hi, not sure this is the best place to go for my problem, but hoping someone can point me to the correct or better place. I have two currently working CentOS 7 based email servers that host a number of virtual domains and users and delivers mail just fine - for correctly addressed vmail inboxes AND for alias addressed emails and domains. These all use postfix, dovecot, amavisd, clamAV, spamassassin, mysql (mariadb) and roundcubemail I use port 25 for the world email delivery - no auth needed as only accepts hosted virtual domain addressed email. and port 587 for user client MUA to send mail - smtp with STARTTLS auth needed port 993 for MUA IMAP access to account mail boxes A couple of weeks ago I rolled up a new minimal virtual server (also CentOS 7) and basically copied the same setup as the other two and have now spent far too long trying to get it going. My initial problem was that I set up mydestination to include $mydomain - this has the consequence of seeing any mail@$mydomain as local email and trying to deliver to the local machine rather than the vmail inboxes. So after setting up a new domain just for the MX we moved on. All three installations use mysql (mariadb) as the data store for domains, alias domains, user vmail accounts, and forwardings (virtual alias mapping) The mysql bits work just fine as I can send mail from an MUA client and they deliver correctly via an authenticated session on port 587 - i.e to any world email address AND to local vmail boxes, including those addressed via an alias and/or alias domain. What fails to work on the new installation, but works fine on my two legacy servers, is mail addressed via an alias. Specifically an alias domain. Even adding the complete alias email address to the forwardings table doesn't work. e.g. let's say we have an email domain '@example.com' and an alias domain '@example.org'. Needed so I can migrate my clients from one server to the other in a staged manner. Thus the new server is set up to operate as the MX for @example.org and @example.com but needs to alias redirect the incoming emails being sent to fred(a)example.org and deliver them to the vmail location for fred(a)example.com (i.e. we have no vmail locations for @example.org only for @example.com So if I send a test email via my MUA (using port 587 and hence authenticated) it does the alias lookups and translations needed and correctly delivers the mail. However if I send an email to fred(a)example.org from say a gmail account, it arrives at my new server and promptly gets bounced with a 550 5.7.1 error - no such email address. After doing diff on the main.cf and master.cf from all three servers the only differences are the myhostname, mynetworks (new one is dual stack IP4/IPv6 and thus includes [::1]/128), smtpd_tls certificate names, and the virtual_uid_maps - all expected and accounted for. master.cf are identical Many dozens of google searches and reading far too many pages, has left me with no idea why my new server doesn't accept alias directed emails via port 25. All the documentation indicates that alias lookups and translations are performed by postfix - all the time. receive_override_options is not set. Any suggestions of things to check or test would be welcome. TIA Rob

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Re: [CentOS] Infiniband
by Mark Woolfson 09 Oct '21

09 Oct '21

Hello, Please can someone help. I have a large server cluster running CentOS 6.4 and CentOS 6.6 using 10GbE. I want to upgrade to Infiniband. What Mellanox ConnectX VPI is supported natively on these OS's? What Mellanox ConnectX VPI is supported using an additional device driver on these OS's? Mark -- This email has been checked for viruses by AVG. https://www.avg.com

3 2

Re: [CentOS] Postfix and virtual mail boxes.
by Gionatan Danti 08 Oct '21

08 Oct '21

Il 2021-10-07 12:40 Rob Kampen ha scritto: > mydestination = localhost localhost.localdomain > mydomain = example.org > myhostname = mx.example.org > mynetworks = 127.0.0.0/8, [::1]/128 Not that I expect it to be the cause, but you need a coma between "localhost" and "localhost.localdomain" in mydestination. > I had originally only used "postconf -n" as it is MUCH smaller than > postconf , however it still shows no material differences. Yeah, it seem the config are very similar (with the exception of virtual_alias_maps, which you explained). Regards. -- Danti Gionatan Supporto Tecnico Assyoma S.r.l. - www.assyoma.it email: g.danti(a)assyoma.it - info(a)assyoma.it GPG public key ID: FF5F32A8

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