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https://github.com/ceph/ceph
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92 lines
2.9 KiB
ReStructuredText
92 lines
2.9 KiB
ReStructuredText
##############
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ON-DISK FORMAT
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##############
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************
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UPGRADE PATH
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************
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On-disk formats, or even data structure formats, may be changed during an
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upgrade. Services wishing to do so, may so do it via the
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`PaxosService::upgrade_format()` call path. There is no formalized, unified
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format versioning; the `PaxosService` class keeps track of its
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`format_version` through a key in the store, assumed an `unsigned int`, but
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it will be the service's responsibility to give meaning to those versions.
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AUTH MONITOR
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============
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versions
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--------
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versions are represented with a single `unsigned int`. By default, the value
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zero represents the absence of a formal upgraded format. The first format
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version was introduced in Dumpling; clusters upgrading to Dumpling saw their
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format version being increased from zero to one::
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0 to 1 - introduced in v0.65, dev release for v0.67 dumpling
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1 to 2 - introduced in v12.0.2, dev release for luminous
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2 to 3 - introduced in mimic
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0 - all clusters pre-dumpling
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1 - all clusters dumpling+ and pre-luminous
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2 - all clusters luminous+ and pre-mimic
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3 - all clusters mimic+
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version 1: introduces new-style monitor caps (i.e., profiles)
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version 2: introduces mgr caps and bootstrap-mgr key
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version 3: creates all bootstrap and admin keys if they don't yet exist
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callstack
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---------
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format_version set on `PaxosService::refresh()`::
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- initially called from Monitor::refresh_from_paxos
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- initially called from Monitor::init_paxos()
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- initially called from Monitor::preinit()
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AuthMonitor::upgrade_format() called by `PaxosService::_active()`::
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- called from C_Committed callback, from PaxosService::propose_pending()
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- called from C_Active callback, from PaxosService::_active()
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- called from PaxosService::election_finished()
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- on a freshly deployed cluster, upgrade_format() will be first called
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*after* create_initial().
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- on an existing cluster, upgrade_format() will be called after the first
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election.
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- upgrade_format() is irrelevant on a freshly deployed cluster, as there is
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no format to upgrade at this point.
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boil down
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---------
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* if `format_version >= current_version` then format is uptodate, return.
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* if `features doesn't contain LUMINOUS` then `current_version = 1`
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* else if `features doesn't contain MIMIC` then `current_version = 2`
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* else `current_version = 3`
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if `format_version == 0`::
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- upgrade to format version 1
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- move to new-style monitor caps (i.e., profiles):
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- set daemon profiles for existing entities
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- set profile for existing bootstrap keys
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if `format_version == 1`::
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- upgrade to format version 2
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- for existing entities:
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- add new cap for mgr
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- for existing 'mgr' entities, fix 'mon' caps due to bug from kraken
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setting 'allow \*', and set 'allow profile mgr' instead.
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- add bootstrap-mgr key.
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if `format_version == 2`::
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- upgrade to format version 3
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- create all bootstrap keys if they don't currently exist
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