Discuss August 2017

discuss@lists.centos.org

94 participants
72 discussions

Problem with softwareraid
by Mr Typo 20 Aug '17

20 Aug '17

Hello all, i have already had a discussion on the software raid mailinglist and i want to switch to this one :) I am having a really strange problem with my md0 device running centos7. after a new start of my server the md0 was gone. now after trying to find the problem i detected the following: Booting any installed kernel gives me NO md0 device. (ls /dev/md* doesnt give anything). a 'cat /proc/partitions show me now /dev/sd[a-d]1 partition. partprobe and a mdadm assemble gives me "disk busy" [root@quad live]# cat mdstat Personalities : [raid6] [raid5] [raid4] [raid10] unused devices: <none> [root@quad ~]# partprobe device-mapper: remove ioctl on WDC_WD20EFRX-68AX9N0_WD-WMC301255087p1 failed: Device or resource busy Warning: parted was unable to re-read the partition table on /dev/mapper/WDC_WD20EFRX-68AX9N0_WD-WMC301255087 (Device or resource busy). This means Linux won't know anything about the modifications you made. .... .... [root@quad ~]# mdadm --assemble --force /dev/md0 /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sdd1 mdadm: /dev/sda1 is busy - skipping mdadm: /dev/sdb1 is busy - skipping mdadm: /dev/sdc1 is busy - skipping mdadm: /dev/sdd1 is busy - skipping booting from a usb stick for rescue my centos everything works. the md0 device exists and is mounted. (rw). [root@quad usb-rescue]# cat mount | grep '/data' /dev/mapper/data-store on /mnt/sysimage/store type xfs (rw,noatime,seclabel,attr2,largeio,nobarrier,inode64,logbufs=8,logbsize=256k,sunit=256,swidth=768,noquota) /dev/mapper/data-tm on /mnt/sysimage/var/lib/vdr/video type xfs (rw,noatime,seclabel,attr2,largeio,nobarrier,inode64,logbufs=8,logbsize=256k,sunit=256,swidth=768,noquota) 3rd option: i am booting the installed rescue kernel from disk: i am getting a md0 device, but its not started. when i stop the md0 i cant assemble it anymore (disk busy) /dev/md0: Version : 1.2 Creation Time : Wed Aug 20 19:28:52 2014 Raid Level : raid5 Used Dev Size : 1953382272 (1862.89 GiB 2000.26 GB) Raid Devices : 4 Total Devices : 4 Persistence : Superblock is persistent Update Time : Thu Aug 17 22:38:14 2017 State : active, Not Started Active Devices : 4 Working Devices : 4 Failed Devices : 0 Spare Devices : 0 Layout : left-symmetric Chunk Size : 128K Name : quad.core.sartori.at:0 (local to host quad.core.sartori.at) UUID : 9d020f27:c0542472:b95a18d2:5741114d Events : 25458 Number Major Minor RaidDevice State 0 8 1 0 active sync /dev/sda1 1 8 17 1 active sync /dev/sdb1 2 8 33 2 active sync /dev/sdc1 4 8 49 3 active sync /dev/sdd1 anyone got an idea, in which direction the problem could be? more logs needed? please help, i have no ideas anymore. regards Andy

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Centos 7 Install
by Jerry Geis 20 Aug '17

20 Aug '17

I have a Centos 7 install that seems to be filling up disk space to 100% on the root partition. in /tmp I found files of names... systemd-private-XXXXXXXX-colord and rtkit I have never seen these files before. there were also files of XXXXXXXXXXXXX.tmp in the /tmp folder. Why are these files appearing? I have a number of installs and never came across this before. Thanks, Jerry

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CentOS6, IP6tables, Routing, TPROXY (squid34 epel package)
by Walter H. 20 Aug '17

20 Aug '17

Hello, how do achieve this: how must files /etc/sysconfig/network-scripts/ look like to be the same as entering the following two commands ... ip -f inet6 rule add fwmark 1 lookup 100 ip -f inet6 route add local ::/0 dev lo table 100 is there the localhost device lo correct, or does it have to be br0? e.g. a file route-br0 with 192.168.1.0/24 via 10.10.10.1 dev br0 does the routing to the segment 192.168.1.0/24 via 10.10.10.1 /etc/sysconfig/ip6tables <BEGIN> *mangle :PREROUTING ACCEPT [0:0] :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] -N DIVERT -A DIVERT -j MARK --set-mark 1 -A DIVERT -j ACCEPT -A PREROUTING -i br0 -p tcp -m socket -j DIVERT -A PREROUTING -i br0 -p tcp -d 2a02:1788:2fd::b2ff:5302 --dport 80 -j TPROXY --tproxy-mark 0x1/0x1 --on-port 3129 COMMIT *filter :INPUT DROP [0:0] :FORWARD DROP [0:0] :OUTPUT DROP [0:0] -A INPUT -i br0 -m tcp -p tcp --dport 22 -m state --state NEW -j ACCEPT -A INPUT -i br0 -m tcp -p tcp --dport 80 -m state --state NEW -j ACCEPT -A INPUT -i br0 -m tcp -p tcp --dport 443 -m state --state NEW -j ACCEPT -A INPUT -i br0 -m tcp -p tcp --dport 3129 -m state --state NEW -j ACCEPT </END> the goal should be, that for specific IPv6 hosts (destination), the packets are redirected through the proxy running on the router box, other destinations should be just forwarded without proxy ... LAN port = br0 (dual stack), HE tunnel port = sit1 (ipv6 only), WAN port = eth1 (ipv4 only) Thanks, Walter

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Problem with SNMP rpm
by Lucas Dutra 19 Aug '17

19 Aug '17

Hello everyone, Im trying to configure SNMP to use Kerberos authentication, but im having some trouble. The standard package of snmp dont have the kerberos module included, then i needed to create a new package. So i found the last centos snmp source rpm, version "net-snmp-5.7.2-24.el7_3.2.x86_64", and modified the .spec file to generate a new rpm with the kerberos module. But in the middle of compilation process, this happens: *checking for security modules to use... ksm usm* *checking for krb5-config... /bin/krb5-config* *checking for krb5... checking for krb5_init_context in -lkrb5... yes* *yes* *checking for heimdal... no* *checking to see which crypto API we need to use... checking for krb5_c_encrypt... yes* *(cached) old MIT crypto API* This "old MIT crypto API" dont happen if i use the same configuration with the standard snmp tar.gz And that is the problem, i need to receive "new MIT crypto API" to work. I have the Kerberos properly installed and running. Sorry if this looks confusing, but what im trying to say is that i guess this rpm is broken and need update. I used the same configuration with the rpm and the tar.gz . The tar.gz worked and the rpm didn't. This problem is for the ksm module, not the entire rpm is broken. Someone know who i cant contact to warn about this? Or if there is a new version out there. I searched for a new version but i didn't find anything. I used the 5.7.2 rpm and 5.7.3 tar.gz Thanks for the attention. Lucas.

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CentOS 7 and Majordomo
by tslbai 19 Aug '17

19 Aug '17

Hi, i was running the latest ;-) Version of Majordomo (1.94.5) successful on CentOS 6.5 for years. Since i installed CentOS 7, majordomo isn't working any more (sendmail error). Is there anyone, who is running majordomo on CentOS 7 or has any hint? I know that Majordomo ist very old and greatcircle isn't supporting ist since years and the majordomo-Mailing-list ended 2003. I know about Mailman too, but i'd like to use majordomo as a small and tiny solution for a particular usecase. Thanks for any hint about running majordomo on CentOS 7. Bye, Florian

1 0

rsyslog stops logging on service reload?
by John Jasen 18 Aug '17

18 Aug '17

I have multiple servers running stock CentOS 7 rsyslog 7.4.7-16.el7, which are configured to log locally and over TCP to a remote logserver, also running stock CentOS 7 rsyslog. The remote server uses imptcp to receive, and pretty basic rules to parse and commit to disk. I have several systems that log prolifically, but periodically, they stop soon after the remote log server HUPs (daily logrotate). Very soon after they stop logging (completely, even to local files), the services on these systems block, and our monitoring system starts alerting. Restarting rsyslog on the clients proves ineffectual. The situation may clear itself without intervention after 90 minutes to several hours. However, this does not happen on all client systems in a similar situation (CentOS 7, large volume of constant log data); nor does it happen daily. Any ideas as to what's going on? Thanks in advance.

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Power Fail Protection Update II
by Chris Olson 18 Aug '17

18 Aug '17

Many thanks once again to those that responded to my original posting (and my follow up message) with information about Network UPS Tools, other Linux-based tools like rtcwake, and commercial UPS products. We have quite a bit more evaluation and testing work to do before a power fail protection method is selected. I hope the discussion is as beneficial to others as it is to my organization. Along the way, one of our users pointed out that some of our CentOS 6 desktop/deskside machines actually throttle back power consumption in different ways than others. Instead of the yellow/amber LED display in the center of the power button, they flash green and then go solid green after the power button is pushed and the system wakes up. We have also noted that none of our CentOS 6 systems restart on their own when power is restored. This is the case whether power is lost during normal operation or when the systems are in a standby state when line power is lost. These two conditions or states (yellow/amber vs flashing green) have us wondering exactly what standby mode these systems are in and what settings may have been selected to send them to their standby state. Is there some sort of standard that applies to the standby states and are there BIOS settings or configuration files that control the what, how, and when standby is directed? Thanks to all and best regards.

1 0

fcitx-anthy request (for Japanese users)
by Scott Robbins 18 Aug '17

18 Aug '17

Apropos of the discussion this week with the person trying to get Chinese input going on CentOS, I filed a request for enhancement with Fedora's EPEL to add fcitx-anthy as a package. Currently, I'm able to get it working with the Fedora 20 rpm, but it would be nice to not have to search for it. It's been assigned (I'm not sure how meaningful that is, depending upon the assignee's free time), but anyone who would like to add their support to the request can view the bug at https://bugzilla.redhat.com/show_bug.cgi?id=1471924 -- Scott Robbins PGP keyID EB3467D6 ( 1B48 077D 66F6 9DB0 FDC2 A409 FA54 EB34 67D6 ) gpg --keyserver pgp.mit.edu --recv-keys EB3467D6

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CentOS 7.x Russian certification
by Gorazd 18 Aug '17

18 Aug '17

Dear all, does anyone have any idea where to get a list of all CentOS 7.x versions that are certified to be used within Russia. My guess is that organizations, such as FSTEK, TR-CU declares those versions/distributions of CentOS that are certified to be used with commercial projects in Russia. Anyone with some information on this, plase advice, I would be very grateful. Regards, Gorazd

2 1

Power Fail Protection Update
by Chris Olson 17 Aug '17

17 Aug '17

Many thanks to those that responded to my original posting with information about Network UPS Tools and commercial UPS products. In our planning a path forward to implement UPS-based power fail protection, we have come across what appears to be an issue with the state of the CentOS 6 machines being UPS protected. Most of these machines are desktop/deskside machines that are likely to be idle during non-work hours. It is also likely that they will be hibernating or in a power save mode. In the power save mode, these machines do not respond to keyboard or mouse activity. They also do not respond to network traffic such as a ping from other systems on the network. The method we use to wake them up is a quick push on the power button when the hibernation state is indicated by the button's yellow LED display. This state of hibernation leaves us wondering if these systems will be able to respond to network messages sent by the UPS. We have not yet made it all the way through the NUT and UPS documentation. The hibernation answer may very well be therein, but we have not found it so far. Any help or direction regarding the hibernation issue as it relates to UPS power fail protection will be appreciated. Thanks again and best regards.

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Discuss August 2017