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    CEPH FS Storage Driver

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    • R
      r1 XCP-ng Team
      last edited by

      Hi @maxcuttins - what's your XCP-NG version and can you share checksum for your NFSSR.py file?

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      • R
        Rainer
        last edited by Rainer

        Hi,

        I also play around with xcp-ng and ceph and just tried to use CephFS as a storage repos. I am using XCP-ng 8.0.0 with Ceph Nautilus. Before I tried to use lvm on top of a rbd which basically works but performance is really bad this way.

        So I downloaded your patch and ran it on my test 8.0.0 xenserver, all Hunks succeeded. ceph is also installed, modprobe ceph works. Next I tried to add a new cephFs repository just as you described it above.

        In the end I see an error box pooping up in XencCenter: "SM has thrown a generic python exception". And thats all.

        In /var/log/SMlog I see the log attached below.

        Thanks
        Rainer

        /var/log/SMLog:

        Sep 26 09:42:54 rzinstal4 SM: [18075] lock: opening lock file /var/lock/sm/d63d0d49-522d-6160-a1eb-a9d5f34cec1e/sr
Sep 26 09:42:54 rzinstal4 SM: [18075] lock: acquired /var/lock/sm/d63d0d49-522d-6160-a1eb-a9d5f34cec1e/sr
Sep 26 09:42:54 rzinstal4 SM: [18075] sr_create {'sr_uuid': 'd63d0d49-522d-6160-a1eb-a9d5f34cec1e', 'subtask_of': 'DummyRef:|55cbc4ef-c6e9-4dba-aa5f-8f56b2473443|SR.create', 'args': ['0'], 'host_ref': 'OpaqueRef:0c03f516-7ed5-48ac-895b-51833177aed5', 'session_ref': 'OpaqueRef:d472846e-c6aa-467d-ac8b-0f401fbc698c', 'device_config': {'server': 'ip_of_mon', 'SRmaster': 'true', 'serverpath': '/sds', 'options': 'name=admin,secretfile=/etc/ceph/admin.secret'}, 'command': 'sr_create', 'sr_ref': 'OpaqueRef:9fb35d75-a45c-4ce4-b9f4-8ed8072ad6ad'}
Sep 26 09:42:54 rzinstal4 SM: [18075] ['/usr/sbin/rpcinfo', '-p', 'ip_of_mon']
Sep 26 09:42:54 rzinstal4 SM: [18075] FAILED in util.pread: (rc 1) stdout: '', stderr: 'rpcinfo: can't contact portmapper: RPC: Remote system error - Connection refused
Sep 26 09:42:54 rzinstal4 SM: [18075] '
Sep 26 09:42:54 rzinstal4 SM: [18075] Unable to obtain list of valid nfs versions
Sep 26 09:42:54 rzinstal4 SM: [18075] lock: released /var/lock/sm/d63d0d49-522d-6160-a1eb-a9d5f34cec1e/sr
Sep 26 09:42:54 rzinstal4 SM: [18075] ***** generic exception: sr_create: EXCEPTION <type 'exceptions.TypeError'>, not all arguments converted during string formatting
Sep 26 09:42:54 rzinstal4 SM: [18075]   File "/opt/xensource/sm/SRCommand.py", line 110, in run
Sep 26 09:42:54 rzinstal4 SM: [18075]     return self._run_locked(sr)
Sep 26 09:42:54 rzinstal4 SM: [18075]   File "/opt/xensource/sm/SRCommand.py", line 159, in _run_locked
Sep 26 09:42:54 rzinstal4 SM: [18075]     rv = self._run(sr, target)
Sep 26 09:42:54 rzinstal4 SM: [18075]   File "/opt/xensource/sm/SRCommand.py", line 323, in _run
Sep 26 09:42:54 rzinstal4 SM: [18075]     return sr.create(self.params['sr_uuid'], long(self.params['args'][0]))
Sep 26 09:42:54 rzinstal4 SM: [18075]   File "/opt/xensource/sm/NFSSR", line 216, in create
Sep 26 09:42:54 rzinstal4 SM: [18075]     raise exn
Sep 26 09:42:54 rzinstal4 SM: [18075]
Sep 26 09:42:54 rzinstal4 SM: [18075] ***** NFS VHD: EXCEPTION <type 'exceptions.TypeError'>, not all arguments converted during string formatting
Sep 26 09:42:54 rzinstal4 SM: [18075]   File "/opt/xensource/sm/SRCommand.py", line 372, in run
Sep 26 09:42:54 rzinstal4 SM: [18075]     ret = cmd.run(sr)
Sep 26 09:42:54 rzinstal4 SM: [18075]   File "/opt/xensource/sm/SRCommand.py", line 110, in run
Sep 26 09:42:54 rzinstal4 SM: [18075]     return self._run_locked(sr)
Sep 26 09:42:54 rzinstal4 SM: [18075]   File "/opt/xensource/sm/SRCommand.py", line 159, in _run_locked
Sep 26 09:42:54 rzinstal4 SM: [18075]     rv = self._run(sr, target)
Sep 26 09:42:54 rzinstal4 SM: [18075]   File "/opt/xensource/sm/SRCommand.py", line 323, in _run
Sep 26 09:42:54 rzinstal4 SM: [18075]     return sr.create(self.params['sr_uuid'], long(self.params['args'][0]))
Sep 26 09:42:54 rzinstal4 SM: [18075]   File "/opt/xensource/sm/NFSSR", line 216, in create
Sep 26 09:42:54 rzinstal4 SM: [18075]     raise exn
Sep 26 09:42:54 rzinstal4 SM: [18075]
Sep 26 09:42:54 rzinstal4 SM: [18075] lock: closed /var/lock/sm/d63d0d49-522d-6160-a1eb-a9d5f34cec1e/sr
        R 1 Reply Last reply Reply Quote 0
        • olivierlambertO
          olivierlambert Vates 🪐 Co-Founder CEO
          last edited by

          Hi @Rainer and welcome 🙂

          Please use Markdown syntax for console/code blocks:

          ```
my test
```
          R 1 Reply Last reply Reply Quote 0
          • R
            Rainer @olivierlambert
            last edited by

            Hello oliverlambert,
            thanks for the hint. I edited my post correcting the formatting.

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            • R
              r1 XCP-ng Team @Rainer
              last edited by

              @Rainer Please share your NFSSR.py to check. Are you able to manually mount the SR using #mount.ceph addr1,addr2,addr3,addr4:remotepath localpath?

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              • R
                Rainer
                last edited by

                Hello,

                thanks for your answer. I can mount the the CephFS filesystem on the xenserver this way:

                mount.ceph  1.2.3.4:/base /mnt -o "name=admin,secretfile=/etc/ceph/admin.secret"

                where 1.2.3.4 is the IP of the active ceph monitor.

                In xencenters New-SR-dialog I put the "1.2.3.4:/base" part in the "Share Name" input field and the options name=admin,secretfile=/etc/ceph/admin.secret in the "Advanced Options" field .

                Below I attached my patched /opt/xensource/sm/NFSSR.py file:
                [0_1569574207746_NFSSR.py](Uploading 100%)

                NFSSR.py.txt

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                • R
                  r1 XCP-ng Team
                  last edited by

                  Just so you know - the original patch was for XCP-NG 7.6. I'm checking it for XCP-NG 8.

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                  • R
                    r1 XCP-ng Team
                    last edited by

                    Can you share /opt/xensource/sm/nfs.py as well... it was also supposed to be patched.

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                    • R
                      r1 XCP-ng Team
                      last edited by

                      Updated new patch for XCP-NG 8.

                      1 Reply Last reply Reply Quote 0
                      • olivierlambertO
                        olivierlambert Vates 🪐 Co-Founder CEO
                        last edited by

                        Note that all are hacks are won't survive any upgrade and aren't supported 😉 But it's fine for a proof of concept.

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                        • R
                          r1 XCP-ng Team
                          last edited by r1

                          Agree - unless we have enough interest from community to pack it or make it maintainable, it will stay a hack.

                          Also mentioning the command to apply patch # patch -d/ -p1 < cephfs-8.patch

                          Edit : updated patch strip level

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                          • R
                            Rainer
                            last edited by Rainer

                            Hello and thanks for the new patch. I understand that this is only a kind of hack or better a proof of concept. I do not want to use this for a productive system but only wanted to give it a try with nautilus and see what performance I can expect if this hack hopefully develops to a supported integration of Ceph.

                            I hoped that the patch might work for XCP-ng 8.0 as well but it seems it does not that easily. So I could also install a xenserver 7.6 and use the original patch and test how it works for me. I do not want you to invest too much work in the 8.0 adoption. So if you think testing the patch 8.0 does not really help you in any way, then please do not hesitate and tell me. Else if you are as well interested to test if it works with 8.0 here is what I found out:

                            The new patch does not work completely, there is a "patch unexpectedly ends in middle of line" -warning. On a fresh installed system:

                            # cd /
# patch --verbose -p0  < /cephfs-8.patch
mm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|--- /opt/xensource/sm/nfs.py   20199-27 16:45:11.918853933 +0530
|+++ /opt/xensource/sm/nfs.py   20199-27 16:49:26.910379515 +0530
--------------------------
patching file /opt/xensource/sm/nfs.py
Using Plan A...
Hunk #1 succeeded at 137.
Hunk #2 succeeded at 159.
Hmm...  The next patch looks like a unified diff to me...
The text leading up to this was:
--------------------------
|--- /opt/xensource/sm/NFSSR.py 20199-27 16:44:56.437557255 +0530
|+++ /opt/xensource/sm/NFSSR.py 20199-27 17:07:45.651188670 +0530
--------------------------
patching file /opt/xensource/sm/NFSSR.py
Using Plan A...
Hunk #1 succeeded at 137.
Hunk #2 succeeded at 160.
patch unexpectedly ends in middle of line
Hunk #3 succeeded at 197 with fuzz 1.
done

                            I can do a ceph.mount just like described before but when I instead try to create a new Ceph-FS-SR named "Ceph" in xencenter 8.0.0 I still get the error that SM has thrown a generic python exception.

                            The SMlog error log indicates that creating a NFS repos is tried with the given parameters and not a CephFS one:

                            ...
Sep 30 13:03:05 rzinstal4 SM: [975] sr_create {'sr_uuid': '79cc55db-ee9f-9cc0-8d94-8cdb2915363b', 'subtask_of': 'DummyRef:|6456510f-b2dd-4dcd-b6ab-eb5eb40ceb9c|SR.create', 'args': ['0'], 'host_ref': 'OpaqueRef:72898e54-20b2-4046-9825-94553457fa60', 'session_ref': 'OpaqueRef:8a0819af-8b91-4086-a9cf-04ae37dc8e79', 'device_config': {'server': '1.2.3.4', 'SRmaster': 'true', 'serverpath': '/base', 'options': 'name=admin,secretfile=/etc/ceph/admin.secret'}, 'command': 'sr_create', 'sr_ref': 'OpaqueRef:91c592f6-47a0-40d6-8a33-7fe01831145f'}
Sep 30 13:03:05 rzinstal4 SM: [975] ['/usr/sbin/rpcinfo', '-p', '1.2.3.4']
Sep 30 13:03:05 rzinstal4 SM: [975] FAILED in util.pread: (rc 1) stdout: '', stderr: 'rpcinfo: can't contact portmapper: RPC: Remote system error - Connection refused
Sep 30 13:03:05 rzinstal4 SM: [975] '
Sep 30 13:03:05 rzinstal4 SM: [975] Unable to obtain list of valid nfs versions
...

                            I attached my /opt/xensource/sm/nfs.py file as well.

                            Thanks a lot

                            Rainer
                            nfs.py.txt

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                            • R
                              r1 XCP-ng Team
                              last edited by

                              @r1 said in CEPH FS Storage Driver:

                              patch -d/ -p0 < cephfs-8.patch

                              Please try # patch -d/ -p0 < cephfs-8.patch

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                              • R
                                r1 XCP-ng Team
                                last edited by r1

                                I see that there is a call to check_server_tcp which is expected to return True but not doing so in my patch. I'll modify it.

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                                • R
                                  r1 XCP-ng Team
                                  last edited by

                                  The same patch is updated. Kindly download again and try with # patch -d/ -p1 < cephfs-8.patch.

                                  R 1 Reply Last reply Reply Quote 0
                                  • R
                                    Rainer @r1
                                    last edited by

                                    Thanks for the new patch. Applying the patch does not report any errors or warnings. When I try to create a "NFS" SR I still get the generic python error message from xencenter however the error message in /var/log/SMlog has changed:

                                    Oct  1 10:17:52 xenserver8 SM: [4975] lock: opening lock file /var/lock/sm/76ad6fee-a7a8-34e6-bcce-a53f69a677a9/sr
Oct  1 10:17:52 xenserver8 SM: [4975] lock: acquired /var/lock/sm/76ad6fee-a7a8-34e6-bcce-a53f69a677a9/sr
Oct  1 10:17:52 xenserver8 SM: [4975] sr_create {'sr_uuid': '76ad6fee-a7a8-34e6-bcce-a53f69a677a9', 'subtask_of': 'DummyRef:|c98cee36-24ff-4575-b7
43-3a84cd93ed17|SR.create', 'args': ['0'], 'host_ref': 'OpaqueRef:72898e54-20b2-4046-9825-94553457fa60', 'session_ref': 'OpaqueRef:175293cb-a791-
44be-bd5f-a4cb911adddb', 'device_config': {'server': '1.2.3.4', 'SRmaster': 'true', 'serverpath': '/base', 'options': 'name=admin,secretfil
e=/etc/ceph/admin.secret'}, 'command': 'sr_create', 'sr_ref': 'OpaqueRef:a36f0371-1dc7-4685-a208-24e04a1c1e08'}
Oct  1 10:17:52 xenserver8 SM: [4975] lock: released /var/lock/sm/76ad6fee-a7a8-34e6-bcce-a53f69a677a9/sr
Oct  1 10:17:52 xenserver8 SM: [4975] ***** generic exception: sr_create: EXCEPTION <type 'exceptions.NameError'>, global name 'useroptions' is no
t defined
Oct  1 10:17:52 xenserver8 SM: [4975]   File "/opt/xensource/sm/SRCommand.py", line 110, in run
Oct  1 10:17:52 xenserver8 SM: [4975]     return self._run_locked(sr)
Oct  1 10:17:52 xenserver8 SM: [4975]   File "/opt/xensource/sm/SRCommand.py", line 159, in _run_locked
Oct  1 10:17:52 xenserver8 SM: [4975]     rv = self._run(sr, target)
Oct  1 10:17:52 xenserver8 SM: [4975]   File "/opt/xensource/sm/SRCommand.py", line 323, in _run
Oct  1 10:17:52 xenserver8 SM: [4975]     return sr.create(self.params['sr_uuid'], long(self.params['args'][0]))
Oct  1 10:17:52 xenserver8 SM: [4975]   File "/opt/xensource/sm/NFSSR", line 216, in create
Oct  1 10:17:52 xenserver8 SM: [4975]     raise exn
Oct  1 10:17:52 xenserver8 SM: [4975]
Oct  1 10:17:52 xenserver8 SM: [4975] ***** NFS VHD: EXCEPTION <type 'exceptions.NameError'>, global name 'useroptions' is not defined
Oct  1 10:17:52 xenserver8 SM: [4975]   File "/opt/xensource/sm/SRCommand.py", line 372, in run
Oct  1 10:17:52 xenserver8 SM: [4975]     return self._run_locked(sr)
Oct  1 10:17:52 xenserver8 SM: [4975]   File "/opt/xensource/sm/SRCommand.py", line 159, in _run_locked
Oct  1 10:17:52 xenserver8 SM: [4975]     rv = self._run(sr, target)
Oct  1 10:17:52 xenserver8 SM: [4975]   File "/opt/xensource/sm/SRCommand.py", line 323, in _run
Oct  1 10:17:52 xenserver8 SM: [4975]     return sr.create(self.params['sr_uuid'], long(self.params['args'][0]))
Oct  1 10:17:52 xenserver8 SM: [4975]   File "/opt/xensource/sm/NFSSR", line 216, in create
Oct  1 10:17:52 xenserver8 SM: [4975]     raise exn
Oct  1 10:17:52 xenserver8 SM: [4975]
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                                    • R
                                      r1 XCP-ng Team
                                      last edited by

                                      Looks like variable declaration issue. I had it working for XCP-NG 7.6... Give me some time to fix this and make it working for 8.0

                                      J 1 Reply Last reply Reply Quote 0
                                      • J
                                        jmccoy555 @r1
                                        last edited by jmccoy555

                                        @r1 Is this still in development; would like to get it working with 8.1?

                                        Manually mounting the CephFS works, but the patch fails, probably not surprisingly; or is a GlusterFS approach a better option?

                                        With Ceph Octopus and the cephadm approach setting Ceph up is really easy, so maybe this will become a more popular feature....?

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                                        • R
                                          r1 XCP-ng Team
                                          last edited by

                                          @jmccoy555 I did not continue this. Will definitely rejuvenate it once 8.1 is released. Hopefully next week.

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                                          • R
                                            r1 XCP-ng Team
                                            last edited by r1

                                            @jmccoy555

                                            Notice: This is experimental and will be replaced by any updates to sm package

                                            Ok, so here is updated patch for XCP-NG 8.1

                                            # cd /
# wget "https://gist.githubusercontent.com/rushikeshjadhav/ea8a6e15c3b5e7f6e61fe0cb873173d2/raw/85acc83ec95cba5db7674572b79c403106b48a48/ceph-8.1.patch"
# patch -p0 < ceph-8.1.patch

                                            Apart from patch you would need to install ceph-common to obtain mount.ceph

                                            # yum install centos-release-ceph-nautilus --enablerepo=extras
# yum install ceph-common

                                            There is no need of ceph.ko as now CephFS is part of kernel in 8.1.

                                            You can refer NFS SR (Ceph) creation screenshot in earlier post or use following
                                            # xe sr-create type=nfs device-config:server=10.10.10.10 device-config:serverpath=/ device-config:options=name=admin,secretfile=/etc/ceph/admin.secret name-label=CephFS

                                            To remove this and restore to normal state
                                            # yum reinstall sm

                                            Note: Keep secret in /etc/ceph/admin.secret with permission 600

                                            Edit: Hope to get this into a proper CephSR someday. Until then it must be considered for Proof of Concept only.
                                            Changed ceph release repo to nautilus.

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