Yes, with this last upgrade (pacific) we migrated to the orchestrated model
where everything is in containers. Previously, we managed nfs-ganesha ourselves
and exported shares using FSAL VFS over /cephfs mounted on the NFS server.
With orchestrated ceph managed NFS, ganesha runs in a container and uses FSAL
CEPH instead, which accesses cephfs data via libcephfs instead of reading from
the mounted local FS. I suspect that is part of the problem and is related to
getting the right permissions.
Here is something I noticed. On a separate cluster running same release, the
cephfs_data pool has the following application metadata:
"application_metadata": {
"cephfs": {
"metadata": "cephfs"
}
}
But on the upgraded cluster the application_metadata on cephfs_data/metadata
pools looks like:
"application_metadata": {
"cephfs": {}
}
I'm wondering if that has something to do with the permission issues because
the caps use "tag data=cephfs" to grant the RW permission for the OSDs. How do
I update the application_metadata on the pools? I don't see a subcommand in
the rados utility, I'm hoping I dont have to write something to do it myself.
THough I do see there are APIs for updating in in librados, so I could write a
short C utility to make the change if necessary.
thanks!
________________________________
From: Eugen Block <[email protected]>
Sent: Thursday, March 16, 2023 9:48 AM
To: Wyll Ingersoll <[email protected]>
Cc: [email protected] <[email protected]>
Subject: Re: [ceph-users] Re: Ceph NFS data - cannot read files, getattr
returns NFS4ERR_PERM
That would have been my next question, if it had worked before. So the
only difference is the nfs-ganesha deployment and different (newer?)
clients than before? Unfortunately, I don't have any ganesha instance
running in any of my (test) clusters. Maybe someone else can chime in.
Zitat von Wyll Ingersoll <[email protected]>:
> Nope, that didn't work. I updated the caps to add "allow r path=/"
> to the mds, but it made no difference. I restarted the nfs
> container and unmounted/mounted the share on the client.
>
> The caps now look like:
> key = xxx
> caps mds = "allow rw path=/exports/nfs/foobar, allow r path=/"
> caps mon = "allow r"
> caps osd = "allow rw pool=.nfs namespace=cephfs, allow rw tag
> cephfs data=cephfs"
>
>
> This is really frustrating. We can mount the shares and get
> directory listings, and even create directories and files (empty),
> but cannot read or write any actual data. This would seem to
> indicate a permission problem writing to the cephfs data pool, but
> we haven't tinkered with any of the caps or permissions.
>
> tcpdump shows lots of errors when trying to read a file from the share:
> NFS reply xid 771352420 reply ok 96 getattr ERROR: Operation not permitted
>
> One thing to note - this is a system that has been around for years
> and years and has been upgraded through many iterations of ceph.
> The cephfs data/metadata pools were probably created on Hammer or
> Luminous, though I'm not sure if that would matter or not.
> Everything else operates correctly AFAIK.
>
> I may take this over to the Ganesha mailing list to see if they have
> any ideas.
>
> thanks!
>
>
>
>
> ________________________________
> From: Eugen Block <[email protected]>
> Sent: Thursday, March 16, 2023 3:33 AM
> To: [email protected] <[email protected]>
> Subject: [ceph-users] Re: Ceph NFS data - cannot read files, getattr
> returns NFS4ERR_PERM
>
> Hi,
>
> we saw this on a Nautilus cluster when Clients were updated so we had
> to modify the client caps to allow read access for the "/" directory.
> There's an excerpt in the SUSE docs [1] for that:
>
>> If clients with path restriction are used, the MDS capabilities need
>> to include read access to the root directory.
>> The allow r path=/ part means that path-restricted clients are able
>> to see the root volume, but cannot write to it. This may be an issue
>> for use cases where complete isolation is a requirement.
>
> Can you update the caps and test again?
>
> Regards,
> Eugen
>
> [1] https://documentation.suse.com/ses/7.1/html/ses-all/cha-ceph-cephfs.html
>
> Zitat von Wyll Ingersoll <[email protected]>:
>
>> ceph pacific 16.2.11 (cephadm managed)
>>
>> I have configured some NFS mounts from the ceph GUI from cephfs. We
>> can mount the filesystems and view file/directory listings, but
>> cannot read any file data.
>> The permissions on the shares are RW. We mount from the client
>> using "vers=4.1".
>>
>> Looking at debug logs from the container running nfs-ganesha, I see
>> the following errors when trying to read a file's content:
>> 15/03/2023 15:27:13 : epoch 6411e209 : gw01 : ganesha.nfsd-7[svc_8]
>> complete_op :NFS4 :DEBUG :Status of OP_READ in position 2 =
>> NFS4ERR_PERM, op response size is 7480 total response size is 7568
>> 15/03/2023 15:27:13 : epoch 6411e209 : gw01 : ganesha.nfsd-7[svc_8]
>> complete_nfs4_compound :NFS4 :DEBUG :End status = NFS4ERR_PERM
>> lastindex = 3
>>
>>
>> Also, watching the TCP traffic, I see errors in the NFS protocol
>> corresponding to these messages:
>> 11:44:43.745570 IP xxx.747 > gw01.nfs: Flags [P.], seq
>> 24184536:24184748, ack 11409577, win 602, options [nop,nop,TS val
>> 342245425 ecr 2683489461], length 212: NFS request xid 156024373 208
>> getattr fh 0,1/53
>> 11:44:43.745683 IP gw01.nfs > xxx.747: Flags [P.], seq
>> 11409577:11409677, ack 24184748, win 3081, options [nop,nop,TS val
>> 2683489461 ecr 342245425], length 100: NFS reply xid 156024373 reply
>> ok 96 getattr ERROR: Operation not permitted
>>
>> So there appears to be a permissions problem where nfs-ganesha is
>> not able to "getattr" on cephfs data.
>>
>> The export looks like this (read from rados):
>> EXPORT {
>> FSAL {
>> name = "CEPH";
>> user_id = "nfs.cephfs.7";
>> filesystem = "cephfs";
>> secret_access_key = "xxx";
>> }
>> export_id = 7;
>> path = "/exports/nfs/foobar";
>> pseudo = "/foobar";
>> access_type = "RW";
>> squash = "no_root_squash";
>> attr_expiration_time = 0;
>> security_label = false;
>> protocols = 4;
>> transports = "TCP";
>> }
>>
>> ceph auth permissions for the nfs.cephfs.7 client:
>> [client.nfs.cephfs.7]
>> key = xxx
>> caps mds = "allow rw path=/exports/nfs/foobar"
>> caps mon = "allow r"
>> caps osd = "allow rw pool=.nfs namespace=cephfs, allow rw tag
>> cephfs data=cephfs"
>>
>>
>> Any suggestions?
>>
>>
>>
>>
>>
>> _______________________________________________
>> ceph-users mailing list -- [email protected]
>> To unsubscribe send an email to [email protected]
>
>
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