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107 lines
3.4 KiB
ReStructuredText
107 lines
3.4 KiB
ReStructuredText
=================
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Troubleshooting
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=================
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HTTP Request Errors
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===================
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Examining the access and error logs for the web server itself is
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probably the first step in identifying what is going on. If there is
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a 500 error, that usually indicates a problem communicating with the
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``radosgw`` daemon. Ensure the daemon is running, its socket path is
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configured, and that the web server is looking for it in the proper
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location.
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Crashed ``radosgw`` process
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===========================
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If the ``radosgw`` process dies, you will normally see a 500 error
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from the web server (apache, nginx, etc.). In that situation, simply
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restarting radosgw will restore service.
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To diagnose the cause of the crash, check the log in ``/var/log/ceph``
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and/or the core file (if one was generated).
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Blocked ``radosgw`` Requests
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============================
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If some (or all) radosgw requests appear to be blocked, you can get
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some insight into the internal state of the ``radosgw`` daemon via
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its admin socket. By default, there will be a socket configured to
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reside in ``/var/run/ceph``, and the daemon can be queried with::
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ceph --admin-daemon /var/run/ceph/client.rgw help
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help list available commands
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objecter_requests show in-progress osd requests
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perfcounters_dump dump perfcounters value
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perfcounters_schema dump perfcounters schema
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version get protocol version
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Of particular interest::
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ceph --admin-daemon /var/run/ceph/client.rgw objecter_requests
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...
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will dump information about current in-progress requests with the
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RADOS cluster. This allows one to identify if any requests are blocked
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by a non-responsive ceph-osd. For example, one might see::
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{ "ops": [
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{ "tid": 1858,
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"pg": "2.d2041a48",
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"osd": 1,
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"last_sent": "2012-03-08 14:56:37.949872",
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"attempts": 1,
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"object_id": "fatty_25647_object1857",
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"object_locator": "@2",
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"snapid": "head",
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"snap_context": "0=[]",
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"mtime": "2012-03-08 14:56:37.949813",
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"osd_ops": [
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"write 0~4096"]},
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{ "tid": 1873,
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"pg": "2.695e9f8e",
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"osd": 1,
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"last_sent": "2012-03-08 14:56:37.970615",
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"attempts": 1,
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"object_id": "fatty_25647_object1872",
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"object_locator": "@2",
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"snapid": "head",
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"snap_context": "0=[]",
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"mtime": "2012-03-08 14:56:37.970555",
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"osd_ops": [
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"write 0~4096"]}],
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"linger_ops": [],
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"pool_ops": [],
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"pool_stat_ops": [],
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"statfs_ops": []}
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In this dump, two requests are in progress. The ``last_sent`` field is
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the time the RADOS request was sent. If this is a while ago, it suggests
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that the OSD is not responding. For example, for request 1858, you could
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check the OSD status with::
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ceph pg map 2.d2041a48
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osdmap e9 pg 2.d2041a48 (2.0) -> up [1,0] acting [1,0]
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This tells us to look at ``osd.1``, the primary copy for this PG::
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ceph --admin-daemon /var/run/ceph/osd.1.asok
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{ "num_ops": 651,
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"ops": [
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{ "description": "osd_op(client.4124.0:1858 fatty_25647_object1857 [write 0~4096] 2.d2041a48)",
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"received_at": "1331247573.344650",
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"age": "25.606449",
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"flag_point": "waiting for sub ops",
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"client_info": { "client": "client.4124",
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"tid": 1858}},
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...
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The ``flag_point`` field indicates that the OSD is currently waiting
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for replicas to respond, in this case ``osd.0``.
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