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kpartx can not detach
by Leon Fauster 10 Mar '18

10 Mar '18

OS: EL6 - sometimes I use kpartx -a /mnt/.../lvdisk.img to map the partitions and mount them via /dev/mapper/loop0pX After using the disk (unmounting it) I noticed that detaching such mapping via kpartx -d does not result in freeing up the loop devices. Results: System reboots shows that the filesystem where lvdisk.img is located can't be unmounted. lsof, fuser, ps does not show any usage. Even removing the device node via dmsetup remove /dev/mapper/loop0pX does not help. Trying to unmount the underlying filesystem still shows /mnt: device is busy. Any other suggestions would be greatly appreciated! -- Thanks LF

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yum list "available" versus "updates", and centosplus versioning
by Robert P. J. Day 10 Mar '18

10 Mar '18

quite possibly more a yum question than a centos question, but i'm a bit confused about the difference between listing "available" packages versus "updates" packages. short example -- listing what the yum man page suggests should be "available" for installation, restricting myself to centosplus: $ yum list available --disablerepo=\* --enablerepo=centosplus ... snip ... Available Packages kernel-plus.x86_64 3.10.0-693.17.1.el7.centos.plus centosplus kernel-plus-abi-whitelists.noarch 3.10.0-693.17.1.el7.centos.plus centosplus kernel-plus-devel.x86_64 3.10.0-693.17.1.el7.centos.plus centosplus kernel-plus-doc.noarch 3.10.0-693.17.1.el7.centos.plus centosplus kernel-plus-headers.x86_64 3.10.0-693.17.1.el7.centos.plus centosplus kernel-plus-tools.x86_64 3.10.0-693.17.1.el7.centos.plus centosplus kernel-plus-tools-libs.x86_64 3.10.0-693.17.1.el7.centos.plus centosplus kernel-plus-tools-libs-devel.x86_64 3.10.0-693.17.1.el7.centos.plus centosplus perf.x86_64 3.10.0-693.17.1.el7.centos.plus centosplus postfix.x86_64 2:2.10.1-6.0.1.el7.centos centosplus postfix-perl-scripts.x86_64 2:2.10.1-6.0.1.el7.centos centosplus postfix-sysvinit.noarch 2:2.10.1-6.0.1.el7.centos centosplus python-perf.x86_64 3.10.0-693.17.1.el7.centos.plus centosplus $ first, i always thought "yum list available" would list only packages that i did not *already* have installed, and if i wanted to list installed packages eligible for update, i would run: $ yum list updates --disablerepo=\* --enablerepo=centosplus Updated Packages postfix.x86_64 2:2.10.1-6.0.1.el7.centos centosplus python-perf.x86_64 3.10.0-693.17.1.el7.centos.plus centosplus $ as you can see, the alleged updates are also listed as "available" from the first command -- has it always been this way? if so, i guess i just never noticed. (is there a way to list *only* available, uninstalled packages with some sort of filter?) more curiously, some of the available packages from the centosplus repo have a package version that says merely "centos", not "centos.plus": postfix.x86_64 2:2.10.1-6.0.1.el7.centos centosplus postfix-perl-scripts.x86_64 2:2.10.1-6.0.1.el7.centos centosplus postfix-sysvinit.noarch 2:2.10.1-6.0.1.el7.centos centosplus ^^^^^^ is that deliberate? it would seem to have the potential for confusion if one searches later for packages based on that string. finally, the alleged update for python-perf: python-perf.x86_64 3.10.0-693.17.1.el7.centos.plus centosplus would seem to match *exactly* the currently installed numeric version on my system: $ rpm -q python-perf python-perf-3.10.0-693.17.1.el7.x86_64 $ that is, both seem to be "3.10.0-693.17.1.el7", so how would this constitute an available "update"? perhaps there's something fundamental about version numbering and the centosplus repo i'm missing here. rday

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Upcoming Dojos: Bangalore, Singapore
by Rich Bowen 09 Mar '18

09 Mar '18

I want to draw attention to two upcoming events. First, we have the CentOS Bangalore Dojo. Details are still emerging, but it will be held on March 21 at the Red Hat India office. Details are https://www.meetup.com/CentOS-India/events/248566854/ and more details will be coming very soon. Then, on the following Sunday, March 25th, we'll be holding another Dojo as part of the FOSSAsia event in Singapore, at the Lifelong Learning Institute. The schedule for that event is almost complete, and further details are available here: https://wiki.centos.org/Events/Dojo/Singapore2018 Other tentative upcoming events are listed at https://wiki.centos.org/Events If you are holding any CentOS events - or if you would like to - please get in touch with the centos-promo mailing list (or me directly, if you prefer) for assistance in producing and/or promoting those events. -- Rich Bowen - rbowen(a)redhat.com @RDOcommunity // @CentOSProject // @rbowen

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Re: [CentOS] FW: Squid and HTTPS interception on CentOS 7 ?
by Nicolas Kovacs 09 Mar '18

09 Mar '18

Le 09/03/2018 à 12:01, Patton, Eamonn J a écrit : > Just to let you know that our Office365 safelinks analyser is > categorising the link given below (regarding Squid with SquidAnalyzer > "blog.microlinux.fr") as "malicious". That usually means they have > detected (or think they have detected) some malware on the site. Thanks for reporting this. Though I bluntly admit I just ignore everything coming from Microsoft. Hotmail has been tagging my company's mailserver as a spammer for ages, so I'm tagging everything coming from Microsoft as crapware. Nothing good has ever been produced by this company. The last time I actually used MS Windows for work was around 2001, before Windows XP came out. This is the year I moved to Linux (Slackware 7.1 at the time), and I've been 100 % GNU/Linux ever since. :o) Niki -- Microlinux - Solutions informatiques durables 7, place de l'église - 30730 Montpezat Site : https://www.microlinux.fr Blog : https://blog.microlinux.fr Mail : info(a)microlinux.fr Tél. : 04 66 63 10 32

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Issues with Mirror Sites
by Kenneth Sutherland 09 Mar '18

09 Mar '18

Hi, Newbie question, is there a problem with the Centos 7 mirror sites, no matter what I do the mirror sites are reporting back the meta data in the repodata folder is wrong and I cant do a Yum Update? when I browse to a few of the mirror sites it looks to me that they sym links are broken? I apologies in advance if I got this completely wrong as am still learning Cheers in advance Ken

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mate-terminal crash when using drag-n-drop tabs
by James Pearson 09 Mar '18

09 Mar '18

We're using mate-terminal (1.16.3) from EPEL on CentOS 7.4 with the Mate desktop, but mate-terminal crashes when we do the following: Start mate-terminal, open a tab (File -> Open Tab) then with the left mouse button drag a tab and drop it in the same terminal window - and the terminal window crashes ... I did a bit of Googling, and found this issue reported in earlier releases of mate-terminal - which was fixed - but no mention of issues with 1.16.x However, if I rebuild and install the package from the mate-terminal 1.16.3 SRPM from EPEL, it doesn't crash ... Which is rather bizarre Just wondering if anyone else has seen this problem and/or could explain what might be causing the issue with the binary from EPEL ? Thanks James Pearson

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Memory Leak with PHP
by Alain Jean-Mairet 09 Mar '18

09 Mar '18

I understand that this problem may have very little to do with CentOs, but it happens to occur on a CentOS webserver and maybe you’ll have a clue. Since a few months, after many upgrades on several blogs (now running with PHP7), our server is eating up RAM no end. PHP processes swell to over 2 GB (each) and when the whole RAM and the whole swap are full, problems stack up and finally paralyze the system. This despite having “memory_limit = 512M" in all php.ini (there are several PHP versions on the system, selection is made via .htaccess). CenOS 6.9 on a Xeon 8 cores with now 64 GB RAM. This is a snip of a top this morning, just 2 days after the latest reboot: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 31163 apache 20 0 939m 690m 8876 S 51.5 1.1 102:16.90 php-fpm 29603 apache 20 0 1208m 961m 10m S 33.7 1.5 136:54.95 php-fpm 11858 apache 20 0 1660m 1.4g 9564 R 31.3 2.2 190:41.25 php-fpm 31207 apache 20 0 916m 668m 9636 R 18.1 1.0 101:38.72 php-fpm 31218 apache 20 0 930m 682m 9264 S 16.8 1.1 101:55.51 php-fpm 2873 apache 20 0 1694m 1.4g 9972 S 11.2 2.2 194:42.82 php-fpm 2854 apache 20 0 1657m 1.4g 10m S 9.9 2.2 191:15.43 php-fpm 2326 mysql 20 0 4993m 1.3g 6076 S 7.3 2.0 149:11.06 mysqld 2842 apache 20 0 1664m 1.4g 8996 S 4.9 2.2 191:34.00 php-fpm 17085 apache 20 0 1454m 1.2g 9824 S 1.3 1.9 167:25.43 php-fpm 13850 apache 20 0 464m 45m 5872 S 1.0 0.1 0:43.55 httpd 20044 root 20 0 15276 1496 952 R 1.0 0.0 15:05.99 top 1936 apache 20 0 1684m 1.4g 10m S 0.7 2.2 192:37.37 php-fpm 19109 apache 20 0 463m 44m 5808 S 0.7 0.1 0:18.66 httpd 24782 apache 20 0 465m 46m 5720 S 0.7 0.1 0:12.01 httpd 1848 apache 20 0 1579m 1.3g 10m S 0.3 2.1 183:02.13 php-fpm 2718 root 20 0 1074m 12m 2536 S 0.3 0.0 7:32.85 fail2ban-server 15221 apache 20 0 475m 49m 9508 S 0.3 0.1 0:22.24 httpd 16764 apache 20 0 476m 49m 9456 S 0.3 0.1 0:21.82 httpd 17757 apache 20 0 461m 42m 5784 S 0.3 0.1 0:18.26 httpd 19108 apache 20 0 463m 44m 5848 S 0.3 0.1 0:20.80 httpd 19155 apache 20 0 463m 44m 5756 S 0.3 0.1 0:17.15 httpd 24791 apache 20 0 462m 43m 5764 S 0.3 0.1 0:14.87 httpd 24794 apache 20 0 464m 45m 5780 S 0.3 0.1 0:15.07 httpd 29668 apache 20 0 459m 40m 5888 S 0.3 0.1 0:34.05 httpd 29794 apache 20 0 463m 44m 5868 S 0.3 0.1 0:35.23 httpd 31184 apache 20 0 936m 688m 9572 S 0.3 1.1 103:33.80 php-fpm 31212 apache 20 0 908m 660m 9860 S 0.3 1.0 101:27.74 php-fpm Any idea, suggestion would be greatly appreciated! --

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RADIUS
by hw 09 Mar '18

09 Mar '18

Hi, I´m trying to figure out how to practically use RADIUS to authenticate users. So far, I have only found documentation explaining that the idea is that users somehow magically need to authenticate against a RADIUS server via a device like a switch or a wireless access point before they are given or being denied access to a network. I understand that I have to refer to the documentation of the switch or access point to figure out how to set up RADIUS authentication with the particular device. But how is this achieved in practice? Let´s say I have a couple laptops and a couple phones and a couple computers which connect either to a switch or to a wireless access point. Both the switch and the access point support RADIUS, and I would set them up to talk to the RADIUS server and require every device that wants to connect to the network through them to authenticate first. I also have a couple thin clients and a couple computers which use PXE-boot, and the users of those would have to provide authentication before the machines could even boot. Then what? How do I make it so that the users are actually able to authenticate? Is there any documentation about this? Or am I not supposed to use RADIUS but something else?

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Squid and HTTPS interception on CentOS 7 ?
by Nicolas Kovacs 08 Mar '18

08 Mar '18

Hi, I've been running Squid successfully on CentOS 7 (and before that on 6 and 5), and it's always been running nicely. I've been using it mostly as a transparent proxy filter in school networks. So far, I've only been able to filter HTTP. Do any of you do transparent HTTPS filtering ? Any suggestions, advice, caveats, do's and don'ts ? Cheers from the snowy South of France, Niki -- Microlinux - Solutions informatiques durables 7, place de l'église - 30730 Montpezat Site : https://www.microlinux.fr Blog : https://blog.microlinux.fr Mail : info(a)microlinux.fr Tél. : 04 66 63 10 32

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NIC naming conventions and vmware
by John Ratliff 07 Mar '18

07 Mar '18

I have a couple of CentOS 7 machines running in a vmware environment. On all the older ones I've deployed, the NIC is named ens160, but on all of the new ones, it is named ens192. I can't find any difference in the hardware that would account for this. Any suggestions on what I can do to figure out why some are named ens160 and some ens192? Thanks.

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