Re: mkjournal error creating journal ... : (13) Permission denied

[Peter Maloney <peter.maloney@xxxxxxxxxxxxxxxxxxxx>]

On 03/15/17 08:43, Gunwoo Gim wrote:

 After a reboot, all the partitions of LVM don't show up in /dev/mapper -nor in the /dev/dm-<dm-num> or /proc/partitions- though the whole disks show up; I have to make the hosts run one 'partprobe' every time they boot so as to have the partitions all show up.

Maybe you need this after partprobe:

    udevadm trigger

 I've found out that the udev rules have never triggered even when I removed the DEVTYPE checking part; checked with a udev line: RUN+="/bin/echo 'add /dev/$name' >> /root/log.txt" 

 I've also tried chowning all the /dev/dm-<num> to ceph:disk in vain. Do I have to use the udev rules even if the /dev/dm-<num> s are already owned by ceph:ceph?

No, I think you just need them owned by ceph:ceph. Test that with something like:

    sudo -u ceph hexdump -C /dev/dm-${number} | head

(which reads, not writes...so not a full test, but close enough)

And also make sure the files in /var/lib/ceph/{osd,mon,...} are owned by ceph:ceph too. Maybe you have a mix of root and ceph, which is easy to cause by running it as root when ceph owns some files.


And FYI, I don't like udev, and did not use ceph-deploy or ceph-disk. I did it with a very simple init script instead:

#!/bin/bash
mkdir -p /var/run/ceph
chown ceph:ceph /var/run/ceph
chgrp -R ceph /var/log/ceph
for d in /var/lib/ceph/osd/*/journal; do
    d=$(readlink -f "$d")
    chown ceph:ceph "$d"
done

This works on ubuntu 14.04 as is, a badly written init script, but I think centos will not accept it without the lsb tags.

A side effect of doing it this way is you have to manually run the script again when replacing or adding disks, since it is not run after hot swap like udev is.

 Thank you very much for reading.

Best Regards,

Nicholas.

On Wed, Mar 15, 2017 at 1:06 AM Gunwoo Gim <wind8702@xxxxxxxxx> wrote:

 Thank you very much, Peter.

 I'm sorry for not clarifying the version number; it's kraken and 11.2.0-1xenial.

 I guess the udev rules in this file are supposed to change them : /lib/udev/rules.d/95-ceph-osd.rules

 ...but the rules' filters don't seem to match the DEVTYPE part of the prepared partitions on the LVs I've got on the host.

 Would it have been the cause of trouble? I'd love to be informed of a good way to make it work with the logical volumes; should I fix the udev rule?

~ # cat /lib/udev/rules.d/95-ceph-osd.rules | head -n 19

# OSD_UUID

ACTION="" SUBSYSTEM=="block", \

  ENV{DEVTYPE}=="partition", \

  ENV{ID_PART_ENTRY_TYPE}=="4fbd7e29-9d25-41b8-afd0-062c0ceff05d", \

  OWNER:="ceph", GROUP:="ceph", MODE:="660", \

  RUN+="/usr/sbin/ceph-disk --log-stdout -v trigger /dev/$name"

ACTION="" SUBSYSTEM=="block", \

  ENV{ID_PART_ENTRY_TYPE}=="4fbd7e29-9d25-41b8-afd0-062c0ceff05d", \

  OWNER="ceph", GROUP="ceph", MODE="660"

# JOURNAL_UUID

ACTION="" SUBSYSTEM=="block", \

  ENV{DEVTYPE}=="partition", \

  ENV{ID_PART_ENTRY_TYPE}=="45b0969e-9b03-4f30-b4c6-b4b80ceff106", \

  OWNER:="ceph", GROUP:="ceph", MODE:="660", \

  RUN+="/usr/sbin/ceph-disk --log-stdout -v trigger /dev/$name"

ACTION="" SUBSYSTEM=="block", \

  ENV{ID_PART_ENTRY_TYPE}=="45b0969e-9b03-4f30-b4c6-b4b80ceff106", \

  OWNER="ceph", GROUP="ceph", MODE="660"

~ # udevadm info /dev/mapper/vg--ssd1-lv--ssd1p1 | grep ID_PART_ENTRY_TYPE

E: ID_PART_ENTRY_TYPE=45b0969e-9b03-4f30-b4c6-b4b80ceff106

~ # udevadm info /dev/mapper/vg--ssd1-lv--ssd1p1 | grep DEVTYPE

E: DEVTYPE=disk

Best Regards,

Nicholas.

 

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