[Pacemaker] how does the exportfs resource agent work?
emmanuel segura
emi2fast at gmail.com
Tue Jan 17 10:00:17 EST 2012
Hello everyone
For solve this problem i think is better use this parameter
=======================================================
use *OCF_RESKEY_nfs_shared_infodir*= Directory to store nfs server related
infor-
mation.
*The nfsserver resource agent will save nfs related information in this
specific direc-
tory. And this directory must be able to fail-over before nfsserver
itself*.
========================================================
I don't know why, but i don't like use link for make this work
2012/1/16 Andrew Martin <amartin at xes-inc.com>
> Hi Dennis,
>
> Have you also added /var/lib/nfs to the shared DRBD resource? This is an
> important step to ensure that data about currently-open files and mount
> information is transferred to the other node during failover. See the end
> of Step 4:
>
> http://www.howtoforge.com/highly-available-nfs-server-using-drbd-and-heartbeat-on-debian-5.0-lenny
>
> Thanks,
>
> Andrew
>
> ------------------------------
> *From: *"emmanuel segura" <emi2fast at gmail.com>
> *To: *"The Pacemaker cluster resource manager" <
> pacemaker at oss.clusterlabs.org>
> *Sent: *Monday, January 16, 2012 6:06:54 AM
> *Subject: *Re: [Pacemaker] how does the exportfs resource agent work?
>
>
> you should check how you mount the nfs cluster share from your client
>
> for example
>
> mount -o hard,rw,rsize=32768,wsize=32768,suid,proto=tcp,vers=3 -t nfs
> your_virtual_ip:/your_cluster_fs_share /mountpoint
>
> man nfs
>
> =====================================================
> timeo=n The value in tenths of a second before sending the
> first retransmission after an RPC timeout. The
> default value is 7 tenths of a second. After the
> first timeout, the timeout is doubled after each suc-
> cessive timeout until a maximum timeout of 60
> seconds is reached or the enough retransmissions have
> occured to cause a major timeout. Then, if the
> filesystem is hard mounted, each new timeout cascade
> restarts at twice the initial value of the
> previous cascade, again doubling at each retransmission.
> The maximum timeout is always 60 seconds. Better
> overall performance may be achieved by increasing the
> timeout when mounting on a busy network, to a slow
> server, or through several routers or gateways.
>
> retrans=n The number of minor timeouts and retransmissions
> that must occur before a major timeout occurs. The
> default is 3 timeouts. When a major timeout occurs,
> the file operation is either aborted or a "server
> not responding" message is printed on the console.
> =======================================================
>
> 2012/1/16 Dennis Jacobfeuerborn <dennisml at conversis.de>
>
>> What am I supposed to look for?
>>
>> Regards,
>> Dennis
>>
>>
>> On 01/16/2012 12:13 PM, emmanuel segura wrote:
>>
>>> I think man nfs it's can help you
>>>
>>> Try to look your nfs client options
>>>
>>> 2012/1/15 Dennis Jacobfeuerborn <dennisml at conversis.de
>>> <mailto:dennisml at conversis.de>**>
>>>
>>>
>>> Hi,
>>> I'm trying to build a HA nfs system based on drbd and apart from the
>>> nfs export everything is working fine. The problem is that when I
>>> force
>>> a failover things seem to work fine yet when I fail back to the
>>> original system the clients freeze for a very long time.
>>>
>>> /mnt/tmp is the mountpoint on the client and I'm using the following
>>> to
>>> test access:
>>> for i in `seq 1 2000`; do echo $i; ls /mnt/tmp; sleep 1; done
>>>
>>> on a failover the output look like this:
>>>
>>> ...
>>> 47
>>> testfile testfile2
>>> 48
>>> testfile testfile2
>>> 49
>>> testfile testfile2
>>> 50
>>> testfile testfile2
>>> 51
>>> testfile testfile2
>>> 52
>>> ls: cannot open directory /mnt/tmp: Permission denied
>>> 53
>>> ls: cannot open directory /mnt/tmp: Permission denied
>>> 54
>>> <<< freeze of several minutes >>>
>>> testfile testfile2
>>> 55
>>> testfile testfile2
>>> 56
>>> testfile testfile2
>>> ...
>>>
>>> The first question I have is how can I prevent the "Permission denied"
>>> errors? If these occur on e.g. a mountpoint for MySQL for example this
>>> will no doubt lead to problems with the database and that means the
>>> storage isn't really redundant.
>>>
>>> The second question is how do I reduce the failover time? I tried
>>> adding timeo=30 to the client mount options but that doesn't seem to
>>> help.
>>>
>>> This is what my cib looks like:
>>>
>>> node storage1.dev
>>> node storage2.dev
>>> primitive p_drbd_nfs ocf:linbit:drbd \
>>> params drbd_resource="nfs" \
>>> op monitor interval="15" role="Master" \
>>> op monitor interval="30" role="Slave"
>>> primitive p_exportfs_data ocf:heartbeat:exportfs \
>>> params fsid="1" directory="/mnt/data/export"
>>> options="rw,no_root_squash" clientspec="*" \
>>> op monitor interval="30s"
>>> primitive p_fs_data ocf:heartbeat:Filesystem \
>>> params device="/dev/drbd/by-res/nfs" directory="/mnt/data"
>>> fstype="ext3" \
>>> op monitor interval="10s"
>>> primitive p_ip_nfs ocf:heartbeat:IPaddr2 \
>>> params ip="192.168.2.190" cidr_netmask="24" \
>>> op monitor interval="30s"
>>> group g_nfs p_fs_data p_exportfs_data p_ip_nfs
>>> ms ms_drbd_nfs p_drbd_nfs \
>>> meta master-max="1" master-node-max="1" clone-max="2"
>>> clone-node-max="1" notify="true"
>>> colocation c_nfs_on_drbd inf: g_nfs ms_drbd_nfs:Master
>>> order o_drbd_before_nfs inf: ms_drbd_nfs:promote g_nfs:start
>>> property $id="cib-bootstrap-options" \
>>> dc-version="1.0.12-unknown" \
>>> cluster-infrastructure="__**openais" \
>>>
>>> expected-quorum-votes="2" \
>>> stonith-enabled="false" \
>>> no-quorum-policy="ignore"
>>> rsc_defaults $id="rsc-options" \
>>> resource-stickiness="200"
>>>
>>> Regards,
>>> Dennis
>>>
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>>>
>>>
>>>
>>> --
>>> esta es mi vida e me la vivo hasta que dios quiera
>>>
>>>
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>>
>>
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>>
>> Project Home: http://www.clusterlabs.org
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>>
>
>
>
> --
> esta es mi vida e me la vivo hasta que dios quiera
>
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