Discuss November 2017

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105 participants
102 discussions

C7.4 and sshd restart problem
by Alessandro Baggi 06 Nov '17

06 Nov '17

Hi list, Some days ago I updated my centos 7.3 to 7.4 on a dell server. After this update I noticed a strange behaviour by sshd. I noticed this problem because trying to connect to ssh I got connection refused or high latency between connecting and password req. So I noticed that sshd will be restarted every ~2 min. >From log I get this: Received signal 15; terminating Failed to start OpenSSH server daemon Unit sshd.service entered failed state sshd.service failed sshd.service holdoff time over, scheduling restart ....and sshd restart. This happens so fast that if I run systemctl status I can't get the failed status. Logs does not help also in debug facility. There is not any cronjob that kill sshd. I tried also to change some basic sshd_config directives and when running systemctl restart sshd it hangs until I type crtl-C and from log I see that sshd is restarted. In sshd_config there aren't errors and the config is the same since 2016. On another machine in the same network I have the same configuration and same software installed (replica with native c7.4) but the problem does not occurs. I checked also md5 of relative server /usr/sbin/sshd and they match. Selinux is disabled and using non standard port. I notices also that if I'm connected to sshd and sshd crashes/restart my current session is not killed. I have not stopped and restarted sshd because this is a dedicated server and until my provider does not attach a kvm switch I can't do other tests. I will try also to stop sshd and run from console using debug hoping that helps. What I can check to know the reason of this behaviour? This is sshd problem or other? Thanks in advance.

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Error message at times
by Jerry Geis 06 Nov '17

06 Nov '17

I see this message once in a while: Buffer I/O error on dev dm-1, logical block 8388592, async page read I am using two crucial SSD as RAID-1 on CentOS 7.4 What should I do? can I mark that block as not usable. ? Thanks, Jerry

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Re: [CentOS] Maria 10 breaks unixodbc mysql connector
by John Harragin 06 Nov '17

06 Nov '17

What I have found is that the only new shared objects between the different versions of the running isqls is: < lrwxrwxrwx. 1 root root 24 Oct 31 21:25 /usr/lib64/mysql/libmysqlclient.so.18 -> libmysqlclient.so.18.0.0 > lrwxrwxrwx. 1 root root 24 Nov 2 12:13 /usr/lib64/mysql/libmysqlclient.so.18 -> libmysqlclient.so.18.0.0 ... also this is the only shared object with a different node-ID between the 2 instances. >From the journal: Nov 02 12:17:23 ec-ast kernel: isql[39065]: segfault at 10070 ip 00007ff0998b3f7e sp 00007ffc9693bb90 error 4 in libmyodbc5w.so[7ff09988d000+47000] # yum search odbc | grep -E "my|mar" mysql-connector-odbc.x86_64 : ODBC driver for MySQL [root@ec-ast unixodbcproblem]# yum info mysql-connector-odbc.x86_64 Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: mirrors.lga7.us.voxel.net * epel: epel.mirror.constant.com * extras: mirror.atlanticmetro.net * updates: mirror.atlanticmetro.net Installed Packages Name : mysql-connector-odbc Arch : x86_64 Version : 5.2.5 Release : 6.el7 Size : 427 k Repo : installed >From repo : base Summary : ODBC driver for MySQL URL : http://dev.mysql.com/downloads/connector/odbc/ License : GPLv2 with exceptions Description : An ODBC (rev 3) driver for MySQL, for use with unixODBC. yum whatprovides '*libmyodbc5w.so' ...indicates that this is the only source (for my Repo list) for this package which contains the segfaulting file. ... On Thu, Nov 2, 2017 at 1:38 PM, John Harragin <jharragi(a)mw.k12.ny.us> wrote: > OK, I tried again. I ran the following series of commands (some output in > attached file): > > On a separate session, the first sqli process 29669 worked continually. > On a separate session (after mariadb-server 10.1 is installed), isql opens > (proc 39065), but SegFaults upon running a query. > > > mkdir /tmp/unixodbcproblem > ps -A | grep isql > PROCESS=29669 > lsof | grep ${PROCESS} > /tmp/unixodbcproblem/lsof.${PROCESS} > for f in $(pldd ${PROCESS}); do ls -l $f; done > > /tmp/unixodbcproblem/pldd.${PROCESS} > yum install mariadb-server > ps -A | grep isql > PROCESS=39065 > lsof | grep ${PROCESS} > /tmp/unixodbcproblem/lsof.${PROCESS} > for f in $(pldd ${PROCESS}); do ls -l $f; done > > /tmp/unixodbcproblem/pldd.${PROCESS} > setenforce 0 # Ran isql again. Still segmentation > fault. Just to make sure this not the problem > sestatus > yum history list # This reported the most recent > mariadb-server install as: 53 > yum history undo 53 > exit > > # ls /tmp/unixodbcproblem/ > lsof.29669 lsof.39065 pldd.29669 pldd.39065 > > > > This is what I get when mariadb-server 10.1 is installed: > > # isql -vv mccmysql ec-ast ec > +---------------------------------------+ > | Connected! | > | | > | sql-statement | > | help [tablename] | > | quit | > | | > +---------------------------------------+ > SQL> SELECT e_extnum FROM ext LIMIT 5; > Segmentation fault > > > This is what I get when mariadb-server is not installed: > > # isql -vv mccmysql ec-ast ec > +---------------------------------------+ > | Connected! | > | | > | sql-statement | > | help [tablename] | > | quit | > | | > +---------------------------------------+ > SQL> SELECT e_extnum FROM ext LIMIT 1; > +---------+ > | e_extnum| > +---------+ > | 6011 | > +---------+ > SQLRowCount returns 1 > 1 rows fetched > SQL> quit > > > I going to sed & diff... these files to see what I find. If anyone has any > suggestions of tools for this type of investigation, I would love to hear > about it. > > John >

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How to detect botnet user on the server ?
by marcos valentine 06 Nov '17

06 Nov '17

Hello guys, Whats is the best way to identify a possible user using a botnet with php in the server? And if he is using GET commands for example in other server. Does apache logs outbound conections ? If it is using a file that is not malicious the clam av would not identify. Thanks <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campai…> Livre de vírus. www.avast.com <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campai…>. <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>

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Is CentOS extras repo broken?
by Barak Korren 06 Nov '17

06 Nov '17

Hi there, I'm trying to run 'reposync' against centos-extras and am getting an error like this: python-itsdangerous-0.23-2 0% [ ] 0.0 B/s | 0 B --:-- ETA python-itsdangerous-0.23-2.el7 FAILED python-itsdangerous-0.23-2 0% [ ] 0.0 B/s | 0 B --:-- ETA python-itsdangerous-0.23-2.el7.noarch: [Errno 256] No more mirrors to try. Is that package missing from the repo for some reason? Is the repo metadata outdated? Thanks, -- Barak Korren RHV DevOps team , RHCE, RHCi Red Hat EMEA redhat.com | TRIED. TESTED. TRUSTED. | redhat.com/trusted

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Re: [CentOS] HP laptops with CentOS 7?
by Gary Stainburn 06 Nov '17

06 Nov '17

Hi yeah, it's just a normal USB dongle, and it's supported by the Linux Kernel, that's why I tried it. I have tried other USB dongles with Linux before and failed. This one was plug and play. Gary On Friday 03 November 2017 07:49:56 Sorin Srbu wrote: > > -----Original Message----- > > From: CentOS [mailto:centos-bounces@centos.org] On Behalf Of Gary > > Stainburn > > Sent: den 2 november 2017 15:10 > > To: centos(a)centos.org > > Subject: Re: [CentOS] HP laptops with CentOS 7? > > > > On Thursday 02 November 2017 14:04:11 Gary Stainburn wrote: > > > On Thursday 02 November 2017 13:54:41 Sorin Srbu wrote: > > > > Thanks. > > > > Would you know what chipset that particular wifi-dongle is running? > > > > > > > > A wifi-dongle may work, but I'm thinking it's not really desirable to > > go > > > > > that way. > > > > I'm figuring the users will loose that dongle sooner than later! :-) > > > > > > The laptop is in the car so I can't check at the moment, but this is > > > the item. > > > > > > I understand your concern regarding the users, but thet can't be any > > worse > > > > than mine, and they're capable of not losing their mouse dongle. > > > > > > It would be nicer to get it working with the internal one at some > > > point. > > > > It would have helped to incluide the URL > > > > https://thepihut.com/collections/raspberry-pi-wifi/products/usb-wifi- > > adapter-for-the-raspberry-pi > > Huh? Raspberry Pi-dongles work on off-the-shelf laptops too? > > > -- > //Sorin > _______________________________________________ > CentOS mailing list > CentOS(a)centos.org > https://lists.centos.org/mailman/listinfo/centos -- Gary Stainburn Group I.T. Manager Ringways Garages http://www.ringways.co.uk https://fundraise.cancerresearchuk.org/page/garys-march-march

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CentOS 6 P2V alternatives?
by Sorin Srbu 06 Nov '17

06 Nov '17

Hello all, This week I've tested out a few ways to do a P2V on a rather ancient CentOS 6 server, in order to move it to a Hyper-V host. So far my tests have failed rather spectacularly. Initially I was set on doing a simple dd-routine, but was told that the server cannot be taken off-line as it's being used daily, so had to look for other solutions. The disk setup is currently as follows: Three 500 GB sata-disks, sda, sdb and sdc, are used to build a software raid called md0. No LVM's here. Sdd is a 120 GB drive, with partitions for boot, swap, home and /. No LVM's here either. The farthest I've gotten is with the Rear solution. http://relax-and-recover.org/ The backup goes well, but recovery for some reason fails to create initramfs with all the installed kernels, as well as failing with an error saying it cannot find /boot/grub, after which the recovery terminates. Virtualizing systems like this is kinda' new to me, having it done on Windows only, and I'm not really sure how to proceed when it's a CentOS system in question. The physical CentOS-server runs a few license managers and nfs-shares that server molecular modeling software, that are rather intricately set up (I inherited this server some fifteen years ago). Are there any easier ways to do a P2V at all? -- BW, Sorin ----------------------------------------------------------- # Sorin Srbu, Sysadmin # Uppsala University # Dept of Medicinal Chemistry # Div of Org Pharm Chem # Box 574 # SE-75123 Uppsala # Sweden # # Phone: +46 (0)18-4714482 # Visit: BMC, Husargatan 3, D5:512b # Web: http://www.orgfarm.uu.se ----------------------------------------------------------- # O< ASCII ribbon campaign - Against html E-mail # http://tinyurl.com/ascii-ribbon-campaign # # This message was not sent from an iProduct! # # Please consider the environment before printing this email. # Join the campaign at http://thinkBeforePrinting.org # # MotD follows: Spare yourself many hard falls; don't jump to conclusions

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CentOS-announce Digest, Vol 153, Issue 1
by centos-announce-request＠centos.org 05 Nov '17

05 Nov '17

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. CESA-2017:3111 CentOS 7 liblouis Security Update (Johnny Hughes) ---------------------------------------------------------------------- Message: 1 Date: Fri, 3 Nov 2017 20:03:45 +0000 From: Johnny Hughes <johnny(a)centos.org> To: centos-announce(a)centos.org Subject: [CentOS-announce] CESA-2017:3111 CentOS 7 liblouis Security Update Message-ID: <20171103200345.GA14834(a)n04.lon1.karan.org> Content-Type: text/plain; charset=us-ascii CentOS Errata and Security Advisory 2017:3111 Upstream details at : https://access.redhat.com/errata/RHSA-2017:3111 The following updated files have been uploaded and are currently syncing to the mirrors: ( sha256sum Filename ) x86_64: e6ef46fa345433ec7740b22689e21231f1010374dea252adb0fedc847031ef38 liblouis-2.5.2-11.el7_4.i686.rpm f93ed050440a3693b491b5b636f1817ab8efa5259f4e34f3feec6cfa5888fdd7 liblouis-2.5.2-11.el7_4.x86_64.rpm 9111c6e070c75284cd2ef9b33ca666d45e82d4f4ed4ebe8ea4d9e877764d10b0 liblouis-devel-2.5.2-11.el7_4.i686.rpm a4160979338d91e47722b29a716a183d1a01f45740f40104207849962f0151e4 liblouis-devel-2.5.2-11.el7_4.x86_64.rpm 24430cd6d2e43d3928dc1dc6e42071d1b87e9d6f54d57823f652e0bf1f37106a liblouis-doc-2.5.2-11.el7_4.noarch.rpm 427517b58ef1e5fc4847d61de4f3c89ca08e11c21ea5ceea0ed3f827196cb280 liblouis-python-2.5.2-11.el7_4.noarch.rpm dd54f37714da0433bf28a4b9f6908319847c0dba1b84a6a062561a23f97c3a92 liblouis-utils-2.5.2-11.el7_4.x86_64.rpm Source: deffc7ea7f3ee0210bbcd88c4e66eb8c962cbea9c96e2d393720869c6f1a98d2 liblouis-2.5.2-11.el7_4.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 153, Issue 1 ***********************************************

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Incorrect characters in Chinese font
by H 05 Nov '17

05 Nov '17

I frequently exchange e-mails, read and write documents and visit Chinese websites although the language of my computer is English. As I was translating a Chinese document yesterday, I had three characters I was not able to translate and after much hair-pulling realized to my surprise that they may be incorrectly drawn in Centos 7. These very characters in the same document were drawn correctly on my Android phone... As none of the characters are uncommon, I am very surprised. Could this be a Unicode issue? How does one report this in CentOS? The usual bug tracker?

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low end file server with h/w RAID - recommendations
by Gary Stainburn 04 Nov '17

04 Nov '17

I'm just about to build a new server and I'm looking for recommendations on what hardware to use. I'm happy with either a brand name, or building my own, but would like a hardware RAID controller to run a pair of disks as RAID1 that is actually compatible with and manageable through Linux. Any recommendations would be appreciated. Gary

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Discuss November 2017