Hi guys
I'm wondering if anyone here is using the GlusterFS OCF
resource agents with Pacemaker on CentOS 7?
yum install centos-release-gluster
yum install glusterfs-server
glusterfs-resource-agents
The reason I ask is that there seem to be a few problems with
them on 3.10, but these problems are so severe that I'm
struggling to believe I'm not just doing something wrong.
I created my brick (on a volume previously used for DRBD,
thus its name):
mkfs.xfs /dev/cl/lv_drbd -f
mkdir -p /gluster/test_brick
mount -t xfs /dev/cl/lv_drbd /gluster
And then my volume (enabling clients to mount it via NFS):
systemctl start glusterd
gluster volume create logs replica 2 transport tcp pcmk01-drbd:/gluster/test_brick
pcmk02-drbd:/gluster/test_brick
gluster volume start test_logs
gluster volume set test_logs nfs.disable off
And here's where the fun starts.
Firstly, we need to work around bug 1233344* (which was
closed when 3.7 went end-of-life but still seems valid in
3.10):
sed -i
's#voldir="/etc/glusterd/vols/${OCF_RESKEY_volname}"#voldir="/var/lib/glusterd/vols/${OCF_RESKEY_volname}"#'
/usr/lib/ocf/resource.d/glusterfs/volume
With that done, I [attempt to] stop GlusterFS so it can be
brought under Pacemaker control:
systemctl stop glusterfsd
systemctl stop glusterd
umount /gluster
(I usually have to manually kill glusterfs processes at this
point before the unmount works - why does the systemctl stop
not do it?)
With the node in standby (just one is online in this example,
but another is configured), I then set up the resources:
pcs node standby
pcs resource create gluster_data
ocf:heartbeat:Filesystem device="/dev/cl/lv_drbd"
directory="/gluster" fstype="xfs"
pcs resource create glusterd ocf:glusterfs:glusterd
pcs resource create gluster_vol ocf:glusterfs:volume
volname="test_logs"
pcs resource create test_logs
ocf:heartbeat:Filesystem \
device="localhost:/test_logs"
directory="/var/log/test" fstype="nfs" \
options="vers=3,tcp,nolock,context=system_u:object_r:httpd_sys_content_t:s0"
\
op monitor OCF_CHECK_LEVEL="20"
pcs resource clone glusterd
pcs resource clone gluster_data
pcs resource clone gluster_vol ordered=true
pcs constraint order start gluster_data-clone then
start glusterd-clone
pcs constraint order start glusterd-clone then start
gluster_vol-clone
pcs constraint order start gluster_vol-clone then
start test_logs
pcs constraint colocation add test_logs with
FloatingIp INFINITY
(note the SELinux wrangling - this is because I have a CGI
web application which will later need to read files from the /var/log/test
mount)
At this point, even with the node in standby, it's already
failing:
[root@pcmk01 ~]# pcs status
Cluster name: test_cluster
Stack: corosync
Current DC: pcmk01-cr (version
1.1.15-11.el7_3.5-e174ec8) - partition WITHOUT quorum
Last updated: Thu Dec 7 13:20:41 2017 Last
change: Thu Dec 7 13:09:33 2017 by root via crm_attribute
on pcmk01-cr
2 nodes and 13 resources configured
Online: [ pcmk01-cr ]
OFFLINE: [ pcmk02-cr ]
Full list of resources:
FloatingIp (ocf::heartbeat:IPaddr2):
Started pcmk01-cr
test_logs (ocf::heartbeat:Filesystem):
Stopped
Clone Set: glusterd-clone [glusterd]
Stopped: [ pcmk01-cr pcmk02-cr ]
Clone Set: gluster_data-clone [gluster_data]
Stopped: [ pcmk01-cr pcmk02-cr ]
Clone Set: gluster_vol-clone [gluster_vol]
gluster_vol
(ocf::glusterfs:volume): FAILED pcmk01-cr (blocked)
Stopped: [ pcmk02-cr ]
Failed Actions:
* gluster_data_start_0 on pcmk01-cr 'not configured'
(6): call=72, status=complete, exitreason='DANGER! xfs on
/dev/cl/lv_drbd is NOT cluster-aware!',
last-rc-change='Thu Dec 7 13:09:28 2017',
queued=0ms, exec=250ms
* gluster_vol_stop_0 on pcmk01-cr 'unknown error'
(1): call=60, status=Timed Out, exitreason='none',
last-rc-change='Thu Dec 7 12:55:11 2017',
queued=0ms, exec=20004ms
Daemon Status:
corosync: active/enabled
pacemaker: active/enabled
pcsd: active/enabled
1. The data mount can't be created? Why?
2. Why is there a volume "stop" command being attempted, and
why does it fail?
3. Why is any of this happening in standby? I can't have the
resources failing before I've even made the node live! I could
understand why a gluster_vol start operation would fail when
glusterd is (correctly) stopped, but why is there a *stop*
operation? And why does that make the resource "blocked"?
Given the above steps, is there something fundamental I'm
missing about how these resource agents should be used? How do
*you* configure GlusterFS on Pacemaker?
Any advice appreciated.
Best regards
* https://bugzilla.redhat.com/show_bug.cgi?id=1233344
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