[Gluster-users] Questions on ganesha HA and shared storage size

Soumya Koduri skoduri at redhat.com
Tue Jun 9 06:06:05 UTC 2015 


On 06/09/2015 01:31 AM, Alessandro De Salvo wrote:
> OK, I found at least one of the bugs.
> The /usr/libexec/ganesha/ganesha.sh has the following lines:
>
>      if [ -e /etc/os-release ]; then
>          RHEL6_PCS_CNAME_OPTION=""
>      fi
>
> This is OK for RHEL < 7, but does not work for >= 7. I have changed it to the following, to make it working:
>
>      if [ -e /etc/os-release ]; then
>          eval $(grep -F "REDHAT_SUPPORT_PRODUCT=" /etc/os-release)
>          [ "$REDHAT_SUPPORT_PRODUCT" == "Fedora" ] && RHEL6_PCS_CNAME_OPTION=""
>      fi
>
Oh..Thanks for the fix. Could you please file a bug for the same (and 
probably submit your fix as well). We shall have it corrected.

> Apart from that, the VIP_<node> I was using were wrong, and I should have converted all the “-“ to underscores, maybe this could be mentioned in the documentation when you will have it ready.
> Now, the cluster starts, but the VIPs apparently not:
>
Sure. Thanks again for pointing it out. We shall make a note of it.

> Online: [ atlas-node1 atlas-node2 ]
>
> Full list of resources:
>
>   Clone Set: nfs-mon-clone [nfs-mon]
>       Started: [ atlas-node1 atlas-node2 ]
>   Clone Set: nfs-grace-clone [nfs-grace]
>       Started: [ atlas-node1 atlas-node2 ]
>   atlas-node1-cluster_ip-1  (ocf::heartbeat:IPaddr):        Stopped
>   atlas-node1-trigger_ip-1  (ocf::heartbeat:Dummy): Started atlas-node1
>   atlas-node2-cluster_ip-1  (ocf::heartbeat:IPaddr):        Stopped
>   atlas-node2-trigger_ip-1  (ocf::heartbeat:Dummy): Started atlas-node2
>   atlas-node1-dead_ip-1     (ocf::heartbeat:Dummy): Started atlas-node1
>   atlas-node2-dead_ip-1     (ocf::heartbeat:Dummy): Started atlas-node2
>
> PCSD Status:
>    atlas-node1: Online
>    atlas-node2: Online
>
> Daemon Status:
>    corosync: active/disabled
>    pacemaker: active/disabled
>    pcsd: active/enabled
>
>
Here corosync and pacemaker shows 'disabled' state. Can you check the 
status of their services. They should be running prior to cluster 
creation. We need to include that step in document as well.

> But the issue that is puzzling me more is the following:
>
> # showmount -e localhost
> rpc mount export: RPC: Timed out
>
> And when I try to enable the ganesha exports on a volume I get this error:
>
> # gluster volume set atlas-home-01 ganesha.enable on
> volume set: failed: Failed to create NFS-Ganesha export config file.
>
> But I see the file created in /etc/ganesha/exports/*.conf
> Still, showmount hangs and times out.
> Any help?
> Thanks,
>
Hmm that's strange. Sometimes, in case if there was no proper cleanup 
done while trying to re-create the cluster, we have seen such issues.

https://bugzilla.redhat.com/show_bug.cgi?id=1227709

http://review.gluster.org/#/c/11093/

Can you please unexport all the volumes, teardown the cluster using
'gluster vol set <volname> ganesha.enable off'
'gluster ganesha disable' command.

Verify if the following files have been deleted on all the nodes-
'/etc/cluster/cluster.conf'
'/etc/ganesha/ganesha.conf',
'/etc/ganesha/exports/*'
'/var/lib/pacemaker/cib'

Verify if the ganesha service is stopped on all the nodes.

start/restart the services - corosync, pcs.

And re-try the HA cluster creation
'gluster ganesha enable'


Thanks,
Soumya

> 	Alessandro
>
>> Il giorno 08/giu/2015, alle ore 20:00, Alessandro De Salvo <Alessandro.DeSalvo at roma1.infn.it> ha scritto:
>>
>> Hi,
>> indeed, it does not work :-)
>> OK, this is what I did, with 2 machines, running CentOS 7.1, Glusterfs 3.7.1 and nfs-ganesha 2.2.0:
>>
>> 1) ensured that the machines are able to resolve their IPs (but this was already true since they were in the DNS);
>> 2) disabled NetworkManager and enabled network on both machines;
>> 3) created a gluster shared volume 'gluster_shared_storage' and mounted it on '/run/gluster/shared_storage' on all the cluster nodes using glusterfs native mount (on CentOS 7.1 there is a link by default /var/run -> ../run)
>> 4) created an empty /etc/ganesha/ganesha.conf;
>> 5) installed pacemaker pcs resource-agents corosync on all cluster machines;
>> 6) set the ‘hacluster’ user the same password on all machines;
>> 7) pcs cluster auth <hostname> -u hacluster -p <pass> on all the nodes (on both nodes I issued the commands for both nodes)
>> 8) IPv6 is configured by default on all nodes, although the infrastructure is not ready for IPv6
>> 9) enabled pcsd and started it on all nodes
>> 10) populated /etc/ganesha/ganesha-ha.conf with the following contents, one per machine:
>>
>>
>> ===> atlas-node1
>> # Name of the HA cluster created.
>> HA_NAME="ATLAS_GANESHA_01"
>> # The server from which you intend to mount
>> # the shared volume.
>> HA_VOL_SERVER=“atlas-node1"
>> # The subset of nodes of the Gluster Trusted Pool
>> # that forms the ganesha HA cluster. IP/Hostname
>> # is specified.
>> HA_CLUSTER_NODES=“atlas-node1,atlas-node2"
>> # Virtual IPs of each of the nodes specified above.
>> VIP_atlas-node1=“x.x.x.1"
>> VIP_atlas-node2=“x.x.x.2"
>>
>> ===> atlas-node2
>> # Name of the HA cluster created.
>> HA_NAME="ATLAS_GANESHA_01"
>> # The server from which you intend to mount
>> # the shared volume.
>> HA_VOL_SERVER=“atlas-node2"
>> # The subset of nodes of the Gluster Trusted Pool
>> # that forms the ganesha HA cluster. IP/Hostname
>> # is specified.
>> HA_CLUSTER_NODES=“atlas-node1,atlas-node2"
>> # Virtual IPs of each of the nodes specified above.
>> VIP_atlas-node1=“x.x.x.1"
>> VIP_atlas-node2=“x.x.x.2”
>>
>> 11) issued gluster nfs-ganesha enable, but it fails with a cryptic message:
>>
>> # gluster nfs-ganesha enable
>> Enabling NFS-Ganesha requires Gluster-NFS to be disabled across the trusted pool. Do you still want to continue? (y/n) y
>> nfs-ganesha: failed: Failed to set up HA config for NFS-Ganesha. Please check the log file for details
>>
>> Looking at the logs I found nothing really special but this:
>>
>> ==> /var/log/glusterfs/etc-glusterfs-glusterd.vol.log <==
>> [2015-06-08 17:57:15.672844] I [MSGID: 106132] [glusterd-proc-mgmt.c:83:glusterd_proc_stop] 0-management: nfs already stopped
>> [2015-06-08 17:57:15.675395] I [glusterd-ganesha.c:386:check_host_list] 0-management: ganesha host found Hostname is atlas-node2
>> [2015-06-08 17:57:15.720692] I [glusterd-ganesha.c:386:check_host_list] 0-management: ganesha host found Hostname is atlas-node2
>> [2015-06-08 17:57:15.721161] I [glusterd-ganesha.c:335:is_ganesha_host] 0-management: ganesha host found Hostname is atlas-node2
>> [2015-06-08 17:57:16.633048] E [glusterd-ganesha.c:254:glusterd_op_set_ganesha] 0-management: Initial NFS-Ganesha set up failed
>> [2015-06-08 17:57:16.641563] E [glusterd-syncop.c:1396:gd_commit_op_phase] 0-management: Commit of operation 'Volume (null)' failed on localhost : Failed to set up HA config for NFS-Ganesha. Please check the log file for details
>>
>> ==> /var/log/glusterfs/cmd_history.log <==
>> [2015-06-08 17:57:16.643615]  : nfs-ganesha enable : FAILED : Failed to set up HA config for NFS-Ganesha. Please check the log file for details
>>
>> ==> /var/log/glusterfs/cli.log <==
>> [2015-06-08 17:57:16.643839] I [input.c:36:cli_batch] 0-: Exiting with: -1
>>
>>
>> Also, pcs seems to be fine for the auth part, although it obviously tells me the cluster is not running.
>>
>> I, [2015-06-08T19:57:16.305323 #7223]  INFO -- : Running: /usr/sbin/corosync-cmapctl totem.cluster_name
>> I, [2015-06-08T19:57:16.345457 #7223]  INFO -- : Running: /usr/sbin/pcs cluster token-nodes
>> ::ffff:141.108.38.46 - - [08/Jun/2015 19:57:16] "GET /remote/check_auth HTTP/1.1" 200 68 0.1919
>> ::ffff:141.108.38.46 - - [08/Jun/2015 19:57:16] "GET /remote/check_auth HTTP/1.1" 200 68 0.1920
>> atlas-node1.mydomain - - [08/Jun/2015:19:57:16 CEST] "GET /remote/check_auth HTTP/1.1" 200 68
>> - -> /remote/check_auth
>>
>>
>> What am I doing wrong?
>> Thanks,
>>
>> 	Alessandro
>>
>>> Il giorno 08/giu/2015, alle ore 19:30, Soumya Koduri <skoduri at redhat.com> ha scritto:
>>>
>>>
>>>
>>>
>>> On 06/08/2015 08:20 PM, Alessandro De Salvo wrote:
>>>> Sorry, just another question:
>>>>
>>>> - in my installation of gluster 3.7.1 the command gluster features.ganesha enable does not work:
>>>>
>>>> # gluster features.ganesha enable
>>>> unrecognized word: features.ganesha (position 0)
>>>>
>>>> Which version has full support for it?
>>>
>>> Sorry. This option has recently been changed. It is now
>>>
>>> $ gluster nfs-ganesha enable
>>>
>>>
>>>>
>>>> - in the documentation the ccs and cman packages are required, but they seems not to be available anymore on CentOS 7 and similar, I guess they are not really required anymore, as pcs should do the full job
>>>>
>>>> Thanks,
>>>>
>>>> 	Alessandro
>>>
>>> Looks like so from http://clusterlabs.org/quickstart-redhat.html. Let us know if it doesn't work.
>>>
>>> Thanks,
>>> Soumya
>>>
>>>>
>>>>> Il giorno 08/giu/2015, alle ore 15:09, Alessandro De Salvo <alessandro.desalvo at roma1.infn.it> ha scritto:
>>>>>
>>>>> Great, many thanks Soumya!
>>>>> Cheers,
>>>>>
>>>>> 	Alessandro
>>>>>
>>>>>> Il giorno 08/giu/2015, alle ore 13:53, Soumya Koduri <skoduri at redhat.com> ha scritto:
>>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> Please find the slides of the demo video at [1]
>>>>>>
>>>>>> We recommend to have a distributed replica volume as a shared volume for better data-availability.
>>>>>>
>>>>>> Size of the volume depends on the workload you may have. Since it is used to maintain states of NLM/NFSv4 clients, you may calculate the size of the volume to be minimum of aggregate of
>>>>>> (typical_size_of'/var/lib/nfs'_directory + ~4k*no_of_clients_connected_to_each_of_the_nfs_servers_at_any_point)
>>>>>>
>>>>>> We shall document about this feature sooner in the gluster docs as well.
>>>>>>
>>>>>> Thanks,
>>>>>> Soumya
>>>>>>
>>>>>> [1] - http://www.slideshare.net/SoumyaKoduri/high-49117846
>>>>>>
>>>>>> On 06/08/2015 04:34 PM, Alessandro De Salvo wrote:
>>>>>>> Hi,
>>>>>>> I have seen the demo video on ganesha HA, https://www.youtube.com/watch?v=Z4mvTQC-efM
>>>>>>> However there is no advice on the appropriate size of the shared volume. How is it really used, and what should be a reasonable size for it?
>>>>>>> Also, are the slides from the video available somewhere, as well as a documentation on all this? I did not manage to find them.
>>>>>>> Thanks,
>>>>>>>
>>>>>>> 	Alessandro
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> Gluster-users mailing list
>>>>>>> Gluster-users at gluster.org
>>>>>>> http://www.gluster.org/mailman/listinfo/gluster-users
>>>>>>>
>>>>>
>>>>
>>
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