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database node / possible SYN flooding on port 3306
by Leon Fauster 21 Jul '18

21 Jul '18

Hi folks, I have here a database node running # rpm -qa | grep mysql-server mysql55-mysql-server-5.5.52-1.el6.x86_64 on # virt-what vmware that seems to have a connection problem: # dmesg |grep SYN |tail -5 possible SYN flooding on port 3306. Sending cookies. possible SYN flooding on port 3306. Sending cookies. possible SYN flooding on port 3306. Sending cookies. possible SYN flooding on port 3306. Sending cookies. possible SYN flooding on port 3306. Sending cookies. I adapted already following: # sysctl -a |grep -E 'maxconn|syn_backlog' net.core.somaxconn = 2048 net.ipv4.tcp_max_syn_backlog = 2048 but ListenOverflows and ListenDrops values are still high # cat /proc/net/netstat | awk '{print $21 "-" $22 }' ListenOverflows-ListenDrops 13568-13568 any suggestion? -- Thanks, LF

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Centos 7 - Canon Powershot A410
by Frank Cox 20 Jul '18

20 Jul '18

I have an old Canon Powershot A410 camera that used to just work with Centos 6. All I had to do was install Shotwell and forever after I could just plug that camera in and Shotwell would automatically load and all was well. I'm now trying to get that camera to work on Centos 7, but am having no success. Jul 20 16:01:44 jeff kernel: usb 2-1.3: new full-speed USB device number 4 using ehci-pci Jul 20 16:01:44 jeff kernel: usb 2-1.3: New USB device found, idVendor=04a9, idP roduct=30f9 Jul 20 16:01:44 jeff kernel: usb 2-1.3: New USB device strings: Mfr=1, Product=2 , SerialNumber=0 Jul 20 16:01:44 jeff kernel: usb 2-1.3: Product: Canon Digital Camera Jul 20 16:01:44 jeff kernel: usb 2-1.3: Manufacturer: Canon Inc. Jul 20 16:01:44 jeff mtp-probe: checking bus 2, device 4: "/sys/devices/pci0000: 00/0000:00:1d.0/usb2/2-1/2-1.3" Jul 20 16:01:44 jeff mtp-probe: bus: 2, device: 4 was not an MTP device That last line isn't surprising because this camera apparently used PTP and not MTP. So does anyone know how to enable PTP mode? As far as I can tell the (installed) libgphoto2-2.5.15-1.el7.x86_64 is supposed to support PTP mode cameras but somehow it's not being activated or something? -- MELVILLE THEATRE ~ Real D 3D Digital Cinema ~ www.melvilletheatre.com

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Is there any way I can deploy cPanel web hosting control panel with Microsoft Exchange 2016 groupware behind one static public IP?
by Turritopsis Dohrnii Teo En Ming 20 Jul '18

20 Jul '18

Good evening from Singapore, Is there any way I can deploy cPanel web hosting control panel with Microsoft Exchange 2016 groupware behind one static public IP? Or do I need 2 static public IP addresses at the minimum? With Exchange 2016 groupware taking up HTTP, HTTPS, IMAP, IMAPS, POP3, POP3S, SMTP, and SMTP/S ports, I personally don't think I can deploy cPanel behind the same public IP as Exchange. Please advise. Perhaps you have a brilliant idea. This is for experimental, testing and laboratory purposes. Thank you very much. ===BEGIN SIGNATURE=== Turritopsis Dohrnii Teo En Ming's Academic Qualifications as at 30 Oct 2017 [1] https://tdtemcerts.wordpress.com/ <https://tdtemcerts.wordpress.com/>[2] http://tdtemcerts.blogspot.sg/ <http://tdtemcerts.blogspot.sg/>[3] https://www.scribd.com/user/270125049/Teo-En-Ming <https://www.scribd.com/user/270125049/Teo-En-Ming>===END SIGNATURE===

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Re: [CentOS] Which is better? Microsoft Exchange 2016 or Linux-based SMTP Servers?
by James B. Byrne 20 Jul '18

20 Jul '18

On Thu, July 19, 2018 10:57, Valeri Galtsev wrote: > <rant> > . . . you don't need to recruit spies anymore, just roll out "free" > services, and information will trickle to you. I am old enough to know > what collection of information on everybody leads to (Hitler Germany, > Stalin Russia, ...), but I also know that the worst lesson of history > is: people do not learn lessons of history. . . > </rant> History is the practice of justifying the present by rewriting the past. -- *** e-Mail is NOT a SECURE channel *** Do NOT transmit sensitive data via e-Mail Do NOT open attachments nor follow links sent by e-Mail James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

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CentOS-announce Digest, Vol 161, Issue 5
by centos-announce-request＠centos.org 19 Jul '18

19 Jul '18

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Logwatch inconsistency
by Adrian van Bloois 19 Jul '18

19 Jul '18

Hi all, In my logwatch config I clearly state only too report on Yesterday. The funny thing is that in the MailScanner section the number of mails scanned is different thant th number reported in the postfix section to be put on hold. Ik I grep the Requeue statements in the MailScanner logfile this is exactly the same number as the scan result of Hold in the postfix logfile and is equal to the number reported by logwatch in the MailScanner section. How come postfix reports a lot more being put on hold than the real number? There is at least some inconsistency in there. Adrian -- Adri P. van Bloois "Elegance is not a dispensable luxury but a factor that decides between success and failure." Edsger W. Dijkstra

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Re: [CentOS] Which is better? Microsoft Exchange 2016 or Linux-based SMTP Servers?
by ldb＠braha.nl 18 Jul '18

18 Jul '18

> hi there > > I would categorizeÂ Exchange 2016 as "groupware" rather than SMTP server > per say, because you sent lots of stuff out of Exchange. > > > so to compare Exchange with postfix, exim would not be a proper > comparison. For Linux based groupware that i know is completely free is > Kolab (https://www.kolab.org/) its fairly easy to setup. Not sure about > Zimbra is its Still free as of now. > Kopano is available in a free and a paid version and does everything Exchange does and more (and better): https://kopano.com/ (paid version) https://kopano.io/ (community version, testbed) > > If you are to useÂ postfix, exim or sendmail you would need to setup a > webmail for that and use something like SquirrelMail or Dovecot of > whichÂ that more a bit complex than just setting up Kolab. > > > So in Short if you ware looking for Exchange equivalent in linux try > Kolab or Zimbra. don't look at postfix or exim. > > > On 07/18/2018 07:04 PM, Turritopsis Dohrnii Teo En Ming wrote: >> Good evening from Singapore, >> >> I am torn between deploying Microsoft Exchange 2016 and Linux-based >> SMTP servers like sendmail, postfix, qmail and exim. >> >> Relative ease of installation and configuration is an important >> consideration factor. >> >> Microsoft Exchange 2016, Domain Controller, and Active Directory are >> relatively easy to install and configure. Linux-based SMTP servers are >> extremely difficult to install and configure and of course, extremely >> time-consuming. >> >> One of the features of Microsoft Exchange 2016 is that you can create >> additional folders on your Inbox in the server (server-side). Can >> Linux-based SMTP servers do that? >> >> Does Exchange 2016 offer more user-friendly features or Linux-based >> SMTP servers? >> >> Besides the above considerations, how about security? Traditionally, >> Linux is far more secure than Windows. >> >> Judging by security, Linux-based SMTP servers ought to have a higher >> percentage of the market share? >> >> Finally, I can only use Windows Server 2016 Standard Evaluation Copy >> FREE for a period of 3 years MAXIMUM. But I can use Linux servers and >> Mail Transport Agents (MTA) FREE perpetually. >> >> Please advise. >> >> Thank you very much. >> >> >> >> ===BEGIN SIGNATURE=== >> >> Turritopsis Dohrnii Teo En Ming's Academic Qualifications as at 30 Oct >> 2017 >> >> [1] https://tdtemcerts.wordpress.com/ >> >> <https://tdtemcerts.wordpress.com/> [2] http://tdtemcerts.blogspot.sg/ >> >> <http://tdtemcerts.blogspot.sg/> [3] >> https://www.scribd.com/user/270125049/Teo-En-Ming >> >> <https://www.scribd.com/user/270125049/Teo-En-Ming> ===END SIGNATURE=== >> >> _______________________________________________ >> CentOS mailing list >> CentOS(a)centos.org >> https://lists.centos.org/mailman/listinfo/centos > > _______________________________________________ > CentOS mailing list > CentOS(a)centos.org > https://lists.centos.org/mailman/listinfo/centos > -- L. de Braal BraHa Systems NL - Terneuzen T +31 115 649333

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Firefox 60 crashes when trying to save an image
by Robert Nichols 18 Jul '18

18 Jul '18

On any web page with an image, if i right-click on the image and select "Save Image As...", firefox crashes. Final messages from stderr: (firefox:3401): GLib-GIO-ERROR **: No GSettings schemas are installed on the system [Child 3502, Chrome_ChildThread] WARNING: pipe error (3): Connection reset by peer: file /builddir/build/BUILD/firefox-60.1.0/ipc/chromium/src/chrome/common/ipc_channel_posix.cc, line 353 Trace/breakpoint trap (core dumped) I've reported this on RHEL bugzilla (1601254), but on the off chance that this is a problem with the CentOS build I'm posting here as well. This is firefox-60.1.0-5.el6.centos.x86_64 on CentOS 6.10. -- Bob Nichols "NOSPAM" is really part of my email address. Do NOT delete it.

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CentOS-announce Digest, Vol 161, Issue 4
by centos-announce-request＠centos.org 18 Jul '18

18 Jul '18

Send CentOS-announce mailing list submissions to centos-announce(a)centos.org To subscribe or unsubscribe via the World Wide Web, visit https://lists.centos.org/mailman/listinfo/centos-announce or, via email, send a message with subject or body 'help' to centos-announce-request(a)centos.org You can reach the person managing the list at centos-announce-owner(a)centos.org When replying, please edit your Subject line so it is more specific than "Re: Contents of CentOS-announce digest..." Today's Topics: 1. CEBA-2018:2198 CentOS 7 kernel BugFix Update (Johnny Hughes) ---------------------------------------------------------------------- Message: 1 Date: Tue, 17 Jul 2018 16:17:03 +0000 From: Johnny Hughes <johnny(a)centos.org> To: centos-announce(a)centos.org Subject: [CentOS-announce] CEBA-2018:2198 CentOS 7 kernel BugFix Update Message-ID: <20180717161703.GA1782(a)n04.lon1.karan.org> Content-Type: text/plain; charset=us-ascii CentOS Errata and Bugfix Advisory 2018:2198 Upstream details at : https://access.redhat.com/errata/RHBA-2018:2198 The following updated files have been uploaded and are currently syncing to the mirrors: ( sha256sum Filename ) x86_64: 95c2876aa8dd528ba7f788f27d7fdae5ea6e039c7714eae15330d741c0ec5316 kernel-3.10.0-862.9.1.el7.x86_64.rpm e06bb52c6f5c5a26ce87789a2bfff22a4bb66fe6c08521fea42201220f1fab6f kernel-abi-whitelists-3.10.0-862.9.1.el7.noarch.rpm d2d2a5f1dfda2efec1288af1a7d7710df511f9713831ae62a9d9b7b3033c15e8 kernel-debug-3.10.0-862.9.1.el7.x86_64.rpm e9a8f3cccd26d66418f37461b6b78b0364dfe1b5bce4f48e54d5c6de195b6d37 kernel-debug-devel-3.10.0-862.9.1.el7.x86_64.rpm 46f66fe6498319c7b9c292b85043a74b0fc551787d99b7beb423621b29547263 kernel-devel-3.10.0-862.9.1.el7.x86_64.rpm 8dfb23b21f10d10efe628c00d0dec13aa1fa1ada228bff6c5a57085ce199efff kernel-doc-3.10.0-862.9.1.el7.noarch.rpm 60861e470dd9b9cc8cb30878c0f15e5fc51ec34a172673f4f4de6375e200d1df kernel-headers-3.10.0-862.9.1.el7.x86_64.rpm 6268ef98dfabb383f027a3e378414e87beccae95a6b8a039ec1589993c90e22e kernel-tools-3.10.0-862.9.1.el7.x86_64.rpm c83da4fd86897a22cfef2f3dd60e91492bc9f3bc6ae8173d9f4a10dc80f6319b kernel-tools-libs-3.10.0-862.9.1.el7.x86_64.rpm e494d7ca0aae918e701cbc292286d5dc1efaaf7c24d4522d63b0f2b8a4d9dd26 kernel-tools-libs-devel-3.10.0-862.9.1.el7.x86_64.rpm 4a43c95a64c40e3f0c2d76e0fe62968f3dbfd5a998cade5b2b015d27d218aadb perf-3.10.0-862.9.1.el7.x86_64.rpm 5dd3bee6f776a3bc799f8d4e2fe3581f637da6513aab31d06572bee14ebd6d1d python-perf-3.10.0-862.9.1.el7.x86_64.rpm Source: c12904ff5607b2f2a376eb1ba41e04440afecffef569508e3881894902fbeebf kernel-3.10.0-862.9.1.el7.src.rpm -- Johnny Hughes CentOS Project { http://www.centos.org/ } irc: hughesjr, #centos(a)irc.freenode.net Twitter: @JohnnyCentOS ------------------------------ Subject: Digest Footer _______________________________________________ CentOS-announce mailing list CentOS-announce(a)centos.org https://lists.centos.org/mailman/listinfo/centos-announce ------------------------------ End of CentOS-announce Digest, Vol 161, Issue 4 ***********************************************

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Panic with EL7 KVM guest on EL6 host on AMD server with latest kernel
by Simon Matter 18 Jul '18

18 Jul '18

Hi, I have AMD servers running CentOS 6.10 as KVM host and on it guests running CentOS 7.5. Since the latest kernel update on CentOS 6.10, kernel-2.6.32-754.2.1.el6.x86_64, I can't boot the CentOS 7.5 guests with kernel-3.10.0-862.6.3.el7.x86_64 anymore. Reverting CentOS 6.10 host to kernel-2.6.32-754.el6.x86_64 fixes the problem. Screendump of the panic is attached, not very helpful I guess. The CPU models where I could test it are: cpu family : 15 model : 65 model name : Dual-Core AMD Opteron(tm) Processor 2218 stepping : 3 cpu family : 16 model : 6 model name : AMD Athlon(tm) II Neo N36L Dual-Core Processor stepping : 3 Didn't test on newer CPU family yet. I'm wondering, does someone see the same issue? Does it not happen on Intel CPUs? Thanks for any insight. Regards, Simon

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