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mdraid doesn't allow creation: device or resource busy
by adam_kalisz 07 Jul '17

07 Jul '17

Dear fellow CentOS users, I have never experienced this problem with hard disk management before and cannot explain it to myself on any rational basis. The setup: I have a workstation for testing, running latest CentOS 7.3 AMD64. I am evaluating oVirt and a storage-ha as part of my bachelors thesis. I have already been running a RAID1 (mdraid, lvm2) for the system and some oVirt 4.1 testing. Now I added 6x 500 GB platters from an old server running Debian 8 Jessie with software RAID of a similar fashion as well. That would unexpectably prevent the system from booting past something like (I copied it from the working setup), I ran it over night, so it was actually about 16 hours: "A start job is running for dev-mapper-vg0\x2droot.device (13s / 1min 30s)" Can it be just some kind of a scan, which takes so long? The current throughput based on time (16 h) and capacity (3 TB) would be about 50 MBps. (Those drives can be pretty slow when writing, dd showed about 30 MBps, the write cache is off.) This is actually repeatable. If I unplug those drives and boot again, it all works. I don't know, if it helps but before that I had two screens full of: "dracut-initqueue[331]: Warning: dracut-initqueue timeout - starting timeout scripts" Well, I proceded without this array, and after it booted I connected the array of 6 hard disks again. They were recognized etc. The problem is, I cannot do much. I can dd from and to the harddrives, I can create and delete partitions but I cannot create an md raid array out of them, I cannot create a physical volume or format them with a filesystem. I even tried overwriting all of those harddrives with zeroes, which worked but didn't help at all with the creation of the array afterwards. mdadm --create /dev/md6 --level=5 --raid-devices=6 /dev/sd[cdefgh]1 "mdadm: cannot open /dev/sdc1: Device or resource busy" with pvcreate, it seems as if there was no device, but I clearly see it in /dev/sdc1... "Device /dev/sdc1 not found (or ignored by filtering)." partprobe yields: "device-mapper: remove ioctl on ST3500630NS_9QG0P0PY1 failed: Device or resource busy Warning: parted was unable to re-read the partition table on /dev/mapper/ST3500630NS_9QG0P0PY (Device or resource busy). This means Linux won't know anything about the modifications you made. device-mapper: create ioctl on ST3500630NS_9QG0P0PY1part1-mpath- ST3500630NS_9QG0P0PY failed: Device or resource busy device-mapper: remove ioctl on ST3500630NS_9QG0P0PY1 failed: Device or resource busy" In some forums, it was suggested, dmraid (yes, the old) could be the trouble. I eliminated this hypothesis (overwritten all with zeroes, fakeraid was never present with these disks). Also multipathd/ dm_multipath could be the trouble, someone suggested. The problem is, if I was to remove device-mapper-multipath, I would loose oVirt-engine, because it has multipath as dependency for some reason. Do you have any ideas? What logs/ information should I provide if you want to have a look into this. Best regards Adam Kalisz

3 2

Extreme frustration with GIMP
by Alice Wonder 07 Jul '17

07 Jul '17

I am not a graphics person. Also can't afford to hire one. Trying to follow instructions at https://docs.gimp.org/en/gimp-tutorial-quickie-separate.html I use the "intelligent scissors" just like they say, spend quite a bit of effort doing so. Then click the foreground select tool - just like they say - and suddenly everything I did with the intelligent tool is undone. WTF? Does anyone know of an actual GIMP tutorial for removing background that doesn't cause me to throw a damn brick through my monitor? Photoshop makes it easy, but clearly GIMP developers have a completely different philosophy on how a graphics tool should work and I can't figure out what their philosophy is.

4 4

Web server files ownership?
by Nicolas Kovacs 07 Jul '17

07 Jul '17

Hi, I have a series of websites hosted on two CentOS 7 servers, using Apache virtual hosts. One of these servers is a "sandbox" machine, to test things and to fiddle around. On the sandbox server, I have a few dummy websites I'm hosting. # ls /var/www/html/ default phpinfo slackbox-mail slackbox-site unixbox-mail unixbox-site Since Apache is running as system user 'apache' and system group 'apache', I thought it sensible that hosted files be owned by that process. # ls -l /var/www/html/ total 24 drwxr-x---. 3 apache apache 4096 6 juil. 09:37 default drwxr-x---. 3 apache apache 4096 6 juil. 10:01 phpinfo drwxr-x---. 3 apache apache 4096 6 juil. 09:41 slackbox-mail drwxr-x---. 3 apache apache 4096 6 juil. 09:37 slackbox-site drwxr-x---. 3 apache apache 4096 6 juil. 09:42 unixbox-mail drwxr-x---. 3 apache apache 4096 6 juil. 09:38 unixbox-site Directories are all drwxr-x---, while files are -rw-r-----. Now some guy on the french forum fr.centos.org told me that I got everything wrong, and that my setup is a security flaw, without elaborating any further though. So I thought I'd ask on this list (which is a little bit more urbane than the french forum). 1. What is wrong with my setup ? 2. What do you suggest ? BTW, I don't mind to RTFM, even extensively. Cheers from the sunny South of France, Niki Kovacs -- Microlinux - Solutions informatiques durables 7, place de l'église - 30730 Montpezat Web : http://www.microlinux.fr Mail : info(a)microlinux.fr Tél. : 04 66 63 10 32

4 9

C7 and spoofed MAC address
by m.roth＠5-cent.us 07 Jul '17

07 Jul '17

Got a problem: a user's workstation froze. He wound up rebooting, without calling me in first, so I dunno. But, and this is a show-stopper, when it came up, it came up with the firmware MAC, not the spoofed one. In /etc/sysconfig/network-scripts/ifcg-eth0, I've got the spoofed MAC address, and a UUID. In the grub.conf, I've got net.ifnames=0 biosdevname=0. But when I logged onto his machine, ip a showed eth0... but with the firmware MAC. And I'm wondering if it went to renew its IP address, and lost the spoofed MAC. That might explain his freezes. Anyway, does anyone have any idea if there's some networkmangler or systemd configuration that would force it to pay attention? Note that my hack to fix it was ifdown eth0/ifup eth0, and it's fine. mark

3 2

ntsysv and chkconfig update error
by Mark Haney 07 Jul '17

07 Jul '17

We have a couple of CentOS 7 boxes that were built before I was hired to clean up the kickstart script used for C7 boxes. We had a couple of rpm packages that were pre-C7 that were used and setup the old SysV Init way using ntsysv and chkconfig on these boxes. (I finally fixed that in the newer scripts.) These are out in the field and I'm having to deal with them as they are. One thing I'm having trouble with is updating them without this error: > Error: Package: ntsysv-1.7.2-1.el7_3.1.x86_64 (updates) > Requires: chkconfig = 1.7.2-1.el7_3.1 > Installed: chkconfig-1.3.61-4.el7.x86_64 (@anaconda) > chkconfig = 1.3.61-4.el7 > You could try using --skip-broken to work around the problem > ** Found 1 pre-existing rpmdb problem(s), 'yum check' output follows: > ntsysv-1.7.2-1.el7.x86_64 has missing requires of chkconfig = ('0', > '1.7.2', '1.el7') Now, I've verified the chkconfig v1.7.2 package is available on the mirror we're using, I've rebuilt the RPM database and nothing has worked. I'm not even sure what the problem is at this point. Anyone have any ideas? -- Mark Haney Network Engineer at NeoNova 919-460-3330 option 1 mark.haney(a)neonova.net www.neonova.net

2 2

Virtual IP
by Amine Tengilimoglu 07 Jul '17

07 Jul '17

Hİ all; i need your helps on setting the virtual ip. I am trying to setup static virtual ip on CenOS7. but I want my VIP to should not open when rebooting. My interface settings like this: *for ens33 NIC -> ifcfg-ens33* DEVICE=ens33 BOOTPROTO=none ONBOOT=yes PREFIX=24 IPADDR=192.168.2.151 *and for VIP NIC ens33:2* * -> ifcfg-ens33:2* DEVICE=ens33:2 ONBOOT=no ONPARENT=no PREFIX=24 IPADDR=192.168.2.149 i made up ifcfg-ens33:2 from ifcfg-ens33 by copying it... i dont know where i do wrong?? i am waiting for your help... best regards....

5 4

SCL python3 and supervisor
by Marcin Trendota 07 Jul '17

07 Jul '17

Hi all Is there a possibility to run python3 application (python taken from SCL) under supervisor? I already have one python2 application, and want to add python3 (it's Django app if that matters). A was trying to add LD_LIBRARY_PATH as taken from "enable" script, but it doesn't seems to work (in log i have still python 2.7.5). Is it possible? -- Marcin Trendota

1 0

logical volume is unreadable
by Volker 06 Jul '17

06 Jul '17

Hi all, one of my lv has become completely unaccessible. Every read access results in a buffer io error: Buffer I/O error on dev dm-13, logical block 0, async page read this goes for every block in the lv. A ddrescue failed on every single block. $ lvdisplay --- Logical volume --- LV Path /dev/vg0/lv-vm-tviewer LV Name lv-vm-tviewer VG Name vg0 LV UUID XdgHFs-RHVZ-9BAH-1ZSK-yiBX-qqf0-273CtT LV Write Access read/write LV Creation host, time host1, 2016-02-06 14:58:19 +0100 LV snapshot status INACTIVE destination for lv-vm-tviewer_vorigin LV Status available # open 0 LV Size 58.59 GiB Current LE 15000 COW-table size 5.86 GiB COW-table LE 1500 Snapshot chunk size 4.00 KiB Segments 1 Allocation inherit Read ahead sectors auto - currently set to 8192 Block device 253:13 Other lv on the same volume group are healthy. In fact the whole host runs on the same vg and does not show any problems. Physical volume is a md raid1 device which is also healthy, as well as its hard disks. The faulty lv is used as the storage device for a qemu vm, which suddenly stalled when the io-errors appeared on the host. Is the any way to diagnose this problem? (centos 7) Regards .....Volker

3 5

Firefox 52.2.x and javascipt issues
by Bernard Lheureux 06 Jul '17

06 Jul '17

Hi all, Is it me or there are a lot of troubles with Firefox ESR 52.2.x and javascript ??? I face a lot of troubles with pages I used before correctly running javascript, since the update to firefox-52.2.0-1.el7.centos.x86_64 on my EL7 laptop -- (°- Bernard Lheureux //\ Linux System Administrator v_/_ MailTo:bernard@lheureux.be

3 2

OVAL support for CentOS
by Jesus Linares 06 Jul '17

06 Jul '17

Hi, I would like to know if there is some feed for OVAL checks like in Redhat: https://www.redhat.com/security/data/oval/. Documentation: https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/ht… Other distributions have an oval feed: - Redhat: https://www.redhat.com/security/data/oval/ - Debian: https://www.debian.org/security/oval/ - Ubuntu: https://people.canonical.com/~ubuntu-security/oval/ Thanks a lot. Regards. -- *Jesus Linares* *IT Security Engineer*

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