Discuss August 2019

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82 participants
59 discussions

C7 Kernel module compilation
by Alessandro Baggi 09 Aug '19

09 Aug '19

Hey there, I'm trying to compile a single module following this guide: https://wiki.centos.org/HowTos/BuildingKernelModules#head-d2e4c05886f94c701… and https://wiki.centos.org/HowTos/I_need_the_Kernel_Source I tried to compile a module for novuton led controller supplied by thirdparty and I got several error. To check if this is the wrong procedure I tried to compile cifs module as listed in howto but when loading with modprobe I get "Exec format error", and from dmesg "cifs: no symbol version for module_layout ", the same errors when compiling novuton module and I don't know why I get this error. I noticed that modules in centos are compressed in .xz but after running make M=fs/cifs I got only a .ko kernel module and then I run xz to compress the new module. Can someone help me please? Thanks in advance.

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Two questions
by Jerry Geis 08 Aug '19

08 Aug '19

You guys are awesome working on CentOS 8! Where might a get a list of the packages in CentOS 8 ? Will there be a "in place" upgrade from 7 to 8? Thanks, Jerry

1 0

Win 10 and C 6 CUPS
by mark 07 Aug '19

07 Aug '19

Is there any way, other than installing CUPS on windows, to get the damn Win laptop to print to my C 6 box, which has CUPS running and a USB laserjet? mark

5 6

Mate on Centos 7
by H 07 Aug '19

07 Aug '19

I have been running Mate on Centos 7 for some time but it does not work very well on my HiDPI laptop screen. Today I found that I am running version 1.16 of Mate whereas the current version is 1.22. Undoubtedly many of the issues have been fixed since 1.16 was released in 2016... However, EPEL only provides 1.16 - a release from 2016 - and nothing later. What is the recommended way to upgrade to 1.22?

10 19

Install tunctl on CetnOS 7 ?
by John Chludzinski 07 Aug '19

07 Aug '19

Which repo has tunctl for CentOS 7 ?

3 3

Virtual manager and vhdx
by Jerry Geis 07 Aug '19

07 Aug '19

I am trying to find out if Virtual Manager or qemu directly can take a Hyper v vhdx file and use it "as is"... I desire to not boot windows, update the vhdx image I have created, etc... I'd rather just have the vhdx image sitting on linux, boot the virtual manager with the vhdx file, update what I need to update and shut back down. Is that possible ? Thanks, Jerry

1 0

Question on server speed
by Jerry Geis 06 Aug '19

06 Aug '19

Hi all, I have a customer server with 32 cores, 128G ram i7960X. So nice box... Why is it that "all" I am really doing at the moment is copying things to an external SSD disk USB3 connected and the machine "freezes"... Why is that? clearly plenty of CPU RAM everything... I can see "blocking" to write data to the external disk - but there are 31 other cores and plenty of memory to make it "seem" as nothing is happening right now. Do I need to 'tweak' something to no see GUI freezes... Waiting on characters to show - even remoted in with SSH experiences the same thing - so its not just X. Thanks for any suggestions. Jerry

8 11

[OT] odd network question
by Fred Smith 06 Aug '19

06 Aug '19

I know this is OT, but I'm not sure where else to ask. I can hope for fogiveness! :) My home router sends its logs to the rsyslog on my desktop system, and from there I can learn all kinds of interesting (or disturbing) things. I've written a really horrid shellscript (about 20 things piped together with a temp file in the middle) to give me the count of DROP events for specific incoming ports. (The "Description" field is lifted verbatim from /etc/services.) Count Port Description ----- ---- ----------- 140750 48825 12251 23 telnet 23/tcp 10043 445 microsoft-ds 445/tcp 2869 1 tcpmux 1/tcp # TCP port service multiplexer 2478 9 discard 9/tcp sink null 2154 8080 webcache 8080/tcp http-alt # WWW caching service 1990 5060 sip 5060/tcp # SIP 1592 8089 1452 8545 1358 3389 ms-wbt-server 3389/tcp # MS WBT Server 1275 443 https 443/tcp # http protocol over TLS/SSL 1275 81 1258 5000 commplex-main 5000/tcp # 1244 80 http 80/tcp www www-http # WorldWideWeb HTTP 1022 8291 840 60001 834 7547 cwmp 7547/tcp # DSL Forum CWMP 821 1433 ms-sql-s 1433/tcp # Microsoft-SQL-Server 809 2323 3d-nfsd 2323/tcp # 3d-nfsd 764 5555 personal-agent 5555/tcp # Personal Agent This is just the first screen of it, there are many more. The data compiled here is for the last month (rsyslog is keeping the current log plus four older logs). I find it disturbing that there were 12251 attempts at telnet during that time, 2154 on 8080, and so forth. either I'm some kind of special/hot target, or else everybody gets this kind of crap and may not even know it. But the one thing I mean to ask about here is the very first item, 140,750 attempts at port 48825. What the heck is port 48825? I can't find any reference to anything that uses it online, but for some reason it is extremely popular, at least amongst the turkeys trying to break into my network! A little more grepping: grep 'DPT=48825' Firewall-Log* | grep -o "SRC=[09123456789.]*" | sort -u -t '.' -k "1.5g,1g" | less reveals that of all the source addresses trying to poke at 48825, there are 193 unique addresses. Either this indicates a heck of a lot of sites having at my firewall, or that some few sites are all spoofing their addresses. I can sort of understand people whaling away at ports that may conceal gold, from their warped point of view, but I haven't a clue why so many people would be beating on some apparently unassigned and unused port. Anyone got any clues? Thanks in advance! Fred -- ------------------------------------------------------------------------------- .---- Fred Smith / ( /__ ,__. __ __ / __ : / / / / /__) / / /__) .+' Home: fredex(a)fcshome.stoneham.ma.us / / (__ (___ (__(_ (___ / :__ 781-438-5471 -------------------------------- Jude 1:24,25 ---------------------------------

8 22

Peculiar process name in /proc
by John Horne 05 Aug '19

05 Aug '19

Hello, I was looking at a process through the '/proc' file system, and came across a process name which seemed to contain a hex value: lrwxrwxrwx. 1 xymon xymon 0 Aug 2 14:07 /proc/58032/exe -> /usr/sbin/xymond;5d44410e (deleted) I am aware of what the 'deleted' part means, but have no idea what the ';5d44410e' part means. Is this some sort of thread reference? The file '/usr/sbin/xymond' does exist and is running as a daemon. Anyone know what the ';5d44410e' is referring to? I have tried Googling about this, but found no mention of it. Thanks, John. -- John Horne | Senior Operations Analyst | Technology and Information Services University of Plymouth | Drake Circus | Plymouth | Devon | PL4 8AA | UK ________________________________ [http://www.plymouth.ac.uk/images/email_footer.gif]<http://www.plymouth.ac.uk/worldclass> This email and any files with it are confidential and intended solely for the use of the recipient to whom it is addressed. If you are not the intended recipient then copying, distribution or other use of the information contained is strictly prohibited and you should not rely on it. If you have received this email in error please let the sender know immediately and delete it from your system(s). Internet emails are not necessarily secure. While we take every care, University of Plymouth accepts no responsibility for viruses and it is your responsibility to scan emails and their attachments. University of Plymouth does not accept responsibility for any changes made after it was sent. Nothing in this email or its attachments constitutes an order for goods or services unless accompanied by an official order form.

3 4

gem install reel on Centos 7
by Jerry Geis 05 Aug '19

05 Aug '19

Hi - I installed ruby for something... The instructions said to also do the comand: gem install reel ERROR: Error installing reel: timers requires Ruby version >= 2.2.1. [root@devgeis ~]# ruby --version ruby 2.0.0p648 (2015-12-16) [x86_64-linux] Not sure what to do. Wait for Centos 8? Thoughts? Thanks, Jerry

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Discuss August 2019