v12.2.0 Luminous released

[Abhishek Lekshmanan <abhishek-IBi9RG/b67k@public.gmane.org>]

We're glad to announce the first release of Luminous v12.2.x long term
stable release series. There have been major changes since Kraken
(v11.2.z) and Jewel (v10.2.z), and the upgrade process is non-trivial.
Please read the release notes carefully.

For more details, links & changelog please refer to the
complete release notes entry at the Ceph blog:
http://ceph.com/releases/v12-2-0-luminous-released/


Major Changes from Kraken
-------------------------

- *General*:
  * Ceph now has a simple, built-in web-based dashboard for monitoring cluster
    status.

- *RADOS*:
  * *BlueStore*:
    - The new *BlueStore* backend for *ceph-osd* is now stable and the
      new default for newly created OSDs.  BlueStore manages data
      stored by each OSD by directly managing the physical HDDs or
      SSDs without the use of an intervening file system like XFS.
      This provides greater performance and features.
    - BlueStore supports full data and metadata checksums
      of all data stored by Ceph.
    - BlueStore supports inline compression using zlib, snappy, or LZ4. (Ceph
      also supports zstd for RGW compression but zstd is not recommended for
      BlueStore for performance reasons.)

  * *Erasure coded* pools now have full support for overwrites
    allowing them to be used with RBD and CephFS.

  * *ceph-mgr*:
    - There is a new daemon, *ceph-mgr*, which is a required part of
      any Ceph deployment.  Although IO can continue when *ceph-mgr*
      is down, metrics will not refresh and some metrics-related calls
      (e.g., `ceph df`) may block.  We recommend deploying several
      instances of *ceph-mgr* for reliability.  See the notes on
      Upgrading below.
    - The *ceph-mgr* daemon includes a REST-based management API.
      The API is still experimental and somewhat limited but
      will form the basis for API-based management of Ceph going forward.
    - ceph-mgr also includes a Prometheus exporter plugin, which can provide Ceph
      perfcounters to Prometheus.
    - ceph-mgr now has a Zabbix plugin. Using zabbix_sender it sends trapper
      events to a Zabbix server containing high-level information of the Ceph
      cluster. This makes it easy to monitor a Ceph cluster's status and send
      out notifications in case of a malfunction.

  * The overall *scalability* of the cluster has improved. We have
    successfully tested clusters with up to 10,000 OSDs.
  * Each OSD can now have a device class associated with
    it (e.g., `hdd` or `ssd`), allowing CRUSH rules to trivially map
    data to a subset of devices in the system.  Manually writing CRUSH
    rules or manual editing of the CRUSH is normally not required.
  * There is a new upmap exception mechanism that allows individual PGs to be moved around to achieve
    a *perfect distribution* (this requires luminous clients).
  * Each OSD now adjusts its default configuration based on whether the
    backing device is an HDD or SSD. Manual tuning generally not required.
  * The prototype mClock QoS queueing algorithm is now available.
  * There is now a *backoff* mechanism that prevents OSDs from being
    overloaded by requests to objects or PGs that are not currently able to
    process IO.
  * There is a simplified OSD replacement process that is more robust.
  * You can query the supported features and (apparent) releases of
    all connected daemons and clients with `ceph features`
  * You can configure the oldest Ceph client version you wish to allow to
    connect to the cluster via `ceph osd set-require-min-compat-client` and
    Ceph will prevent you from enabling features that will break compatibility
    with those clients.
  * Several `sleep` settings, include `osd_recovery_sleep`,
    `osd_snap_trim_sleep`, and `osd_scrub_sleep` have been
    reimplemented to work efficiently.  (These are used in some cases
    to work around issues throttling background work.)
  * Pools are now expected to be associated with the application using them.
    Upon completing the upgrade to Luminous, the cluster will attempt to associate
    existing pools to known applications (i.e. CephFS, RBD, and RGW). In-use pools
    that are not associated to an application will generate a health warning. Any
    unassociated pools can be manually associated using the new
    `ceph osd pool application enable` command. For more details see
    `associate pool to application` in the documentation.

- *RGW*:

  * RGW *metadata search* backed by ElasticSearch now supports end
    user requests service via RGW itself, and also supports custom
    metadata fields. A query language a set of RESTful APIs were
    created for users to be able to search objects by their
    metadata. New APIs that allow control of custom metadata fields
    were also added.
  * RGW now supports *dynamic bucket index sharding*. This has to be enabled via
    the `rgw dyamic resharding` configurable. As the number of objects in a
    bucket grows, RGW will automatically reshard the bucket index in response.
    No user intervention or bucket size capacity planning is required.
  * RGW introduces *server side encryption* of uploaded objects with
    three options for the management of encryption keys: automatic
    encryption (only recommended for test setups), customer provided
    keys similar to Amazon SSE-C specification, and through the use of
    an external key management service (Openstack Barbican) similar
    to Amazon SSE-KMS specification.
  * RGW now has preliminary AWS-like bucket policy API support.  For
    now, policy is a means to express a range of new authorization
    concepts.  In the future it will be the foundation for additional
    auth capabilities such as STS and group policy.
  * RGW has consolidated the several metadata index pools via the use of rados
    namespaces.
  * S3 Object Tagging API has been added; while APIs are
    supported for GET/PUT/DELETE object tags and in PUT object
    API, there is no support for tags on Policies & Lifecycle yet
  * RGW multisite now supports for enabling or disabling sync at a
    bucket level.

- *RBD*:

  * RBD now has full, stable support for *erasure coded pools* via the new
    `--data-pool` option to `rbd create`.
  * RBD mirroring's rbd-mirror daemon is now highly available. We
    recommend deploying several instances of rbd-mirror for
    reliability.
  * RBD mirroring's rbd-mirror daemon should utilize unique Ceph user
    IDs per instance to support the new mirroring dashboard.
  * The default 'rbd' pool is no longer created automatically during
    cluster creation. Additionally, the name of the default pool used
    by the rbd CLI when no pool is specified can be overridden via a
    new `rbd default pool = <pool name>` configuration option.
  * Initial support for deferred image deletion via new `rbd
    trash` CLI commands. Images, even ones actively in-use by
    clones, can be moved to the trash and deleted at a later time.
  * New pool-level `rbd mirror pool promote` and `rbd mirror pool
    demote` commands to batch promote/demote all mirrored images
    within a pool.
  * Mirroring now optionally supports a configurable replication delay
    via the `rbd mirroring replay delay = <seconds>` configuration
    option.
  * Improved discard handling when the object map feature is enabled.
  * rbd CLI `import` and `copy` commands now detect sparse and
    preserve sparse regions.
  * Images and Snapshots will now include a creation timestamp.
  * Specifying user authorization capabilities for RBD clients has been
    simplified. The general syntax for using RBD capability profiles is
    "mon 'profile rbd' osd 'profile rbd[-read-only][ pool={pool-name}[, ...]]'".
    For more details see "User Management" in the documentation.

- *CephFS*:

  * *Multiple active MDS daemons* is now considered stable.  The number
    of active MDS servers may be adjusted up or down on an active CephFS file
    system.
  * CephFS *directory fragmentation* is now stable and enabled by
    default on new filesystems.  To enable it on existing filesystems
    use "ceph fs set <fs_name> allow_dirfrags".  Large or very busy
    directories are sharded and (potentially) distributed across
    multiple MDS daemons automatically.
  * Directory subtrees can be explicitly pinned to specific MDS daemons in
    cases where the automatic load balancing is not desired or effective.
  * Client keys can now be created using the new `ceph fs authorize` command
    to create keys with access to the given CephFS file system and all of its
    data pools.
  * When running 'df' on a CephFS filesystem comprising exactly one data pool,
    the result now reflects the file storage space used and available in that
    data pool (fuse client only).

- *Miscellaneous*:

  * Release packages are now being built for *Debian Stretch*.  Note
    that QA is limited to CentOS and Ubuntu (xenial and trusty).  The
    distributions we build for now include:

    - CentOS 7 (x86_64 and aarch64)
    - Debian 8 Jessie (x86_64)
    - Debian 9 Stretch (x86_64)
    - Ubuntu 16.04 Xenial (x86_64 and aarch64)
    - Ubuntu 14.04 Trusty (x86_64)

  * A first release of Ceph for FreeBSD is available which contains a full set
    of features, other than Bluestore. It will run everything needed to build a
    storage cluster. For clients, all access methods are available, albeit
    CephFS is only accessible through a Fuse implementation. RBD images can be
    mounted on FreeBSD systems through rbd-ggate
    Ceph versions are released through the regular FreeBSD ports and packages
    system. The most current version is available as: net/ceph-devel. Once
    Luminous goes into official release, this version will be available as
    net/ceph. Future development releases will be available via net/ceph-devel

  * *CLI changes*:

    - The `ceph -s` or `ceph status` command has a fresh look.
    - `ceph mgr metadata` will dump metadata associated with each mgr
      daemon.
    - `ceph versions` or `ceph {osd,mds,mon,mgr} versions`
      summarize versions of running daemons.
    - `ceph {osd,mds,mon,mgr} count-metadata <property>` similarly
      tabulates any other daemon metadata visible via the `ceph
      {osd,mds,mon,mgr} metadata` commands.
    - `ceph features` summarizes features and releases of connected
      clients and daemons.
    - `ceph osd require-osd-release <release>` replaces the old
      `require_RELEASE_osds` flags.
    - `ceph osd pg-upmap`, `ceph osd rm-pg-upmap`, `ceph osd
      pg-upmap-items`, `ceph osd rm-pg-upmap-items` can explicitly
      manage `upmap` items
    - `ceph osd getcrushmap` returns a crush map version number on
      stderr, and `ceph osd setcrushmap [version]` will only inject
      an updated crush map if the version matches.  This allows crush
      maps to be updated offline and then reinjected into the cluster
      without fear of clobbering racing changes (e.g., by newly added
      osds or changes by other administrators).
    - `ceph osd create` has been replaced by `ceph osd new`.  This
      should be hidden from most users by user-facing tools like
      `ceph-disk`.
    - `ceph osd destroy` will mark an OSD destroyed and remove its
      cephx and lockbox keys.  However, the OSD id and CRUSH map entry
      will remain in place, allowing the id to be reused by a
      replacement device with minimal data rebalancing.
    - `ceph osd purge` will remove all traces of an OSD from the
      cluster, including its cephx encryption keys, dm-crypt lockbox
      keys, OSD id, and crush map entry.
    - `ceph osd ls-tree <name>` will output a list of OSD ids under
      the given CRUSH name (like a host or rack name).  This is useful
      for applying changes to entire subtrees.  For example, `ceph
      osd down `ceph osd ls-tree rack1``.
    - `ceph osd {add,rm}-{noout,noin,nodown,noup}` allow the
      `noout`, `noin`, `nodown`, and `noup` flags to be applied to
      specific OSDs.
    - `ceph osd safe-to-destroy <osd(s)>` will report whether it is safe to
      remove or destroy OSD(s) without reducing data durability or redundancy.
    - `ceph osd ok-to-stop <osd(s)>` will report whether it is okay to stop
      OSD(s) without immediately compromising availability (i.e., all PGs
      should remain active but may be degraded).
    - `ceph log last [n]` will output the last *n* lines of the cluster
      log.
    - `ceph mgr dump` will dump the MgrMap, including the currently active
      ceph-mgr daemon and any standbys.
    - `ceph mgr module ls` will list active ceph-mgr modules.
    - `ceph mgr module {enable,disable} <name>` will enable or
      disable the named mgr module.  The module must be present in the
      configured `mgr_module_path` on the host(s) where `ceph-mgr` is
      running.
    - `ceph osd crush ls <node>` will list items (OSDs or other CRUSH nodes)
      directly beneath a given CRUSH node.
    - `ceph osd crush swap-bucket <src> <dest>` will swap the
      contents of two CRUSH buckets in the hierarchy while preserving
      the buckets' ids.  This allows an entire subtree of devices to
      be replaced (e.g., to replace an entire host of FileStore OSDs
      with newly-imaged BlueStore OSDs) without disrupting the
      distribution of data across neighboring devices.
    - `ceph osd set-require-min-compat-client <release>` configures
      the oldest client release the cluster is required to support.
      Other changes, like CRUSH tunables, will fail with an error if
      they would violate this setting.  Changing this setting also
      fails if clients older than the specified release are currently
      connected to the cluster.
    - `ceph config-key dump` dumps config-key entries and their
      contents.  (The existing `ceph config-key list` only dumps the key
      names, not the values.)
    - `ceph config-key list` is deprecated in favor of `ceph config-key ls`.
    - `ceph config-key put` is deprecated in favor of `ceph config-key set`.
    - `ceph auth list` is deprecated in favor of `ceph auth ls`.
    - `ceph osd crush rule list` is deprecated in favor of `ceph osd crush rule ls`.
    - `ceph osd set-{full,nearfull,backfillfull}-ratio` sets the
      cluster-wide ratio for various full thresholds (when the cluster
      refuses IO, when the cluster warns about being close to full,
      when an OSD will defer rebalancing a PG to itself,
      respectively).
    - `ceph osd reweightn` will specify the `reweight` values for
      multiple OSDs in a single command.  This is equivalent to a series of
      `ceph osd reweight` commands.
    - `ceph osd crush {set,rm}-device-class` manage the new
      CRUSH *device class* feature. Note that manually creating or deleting
      a device class name is generally not necessary as it will be smart
      enough to be self-managed. `ceph osd crush class ls` and
      `ceph osd crush class ls-osd` will output all existing device classes
      and a list of OSD ids under the given device class respectively.
    - `ceph osd crush rule create-replicated` replaces the old
      `ceph osd crush rule create-simple` command to create a CRUSH
      rule for a replicated pool.  Notably it takes a `class` argument
      for the *device class* the rule should target (e.g., `ssd` or
      `hdd`).
    - `ceph mon feature ls` will list monitor features recorded in the
      MonMap.  `ceph mon feature set` will set an optional feature (none of
      these exist yet).
    - `ceph tell <daemon> help` will now return a usage summary.
    - `ceph fs authorize` creates a new client key with caps automatically
      set to access the given CephFS file system.
    - The `ceph health` structured output (JSON or XML) no longer contains
      'timechecks' section describing the time sync status.  This
      information is now available via the 'ceph time-sync-status'
      command.
    - Certain extra fields in the `ceph health` structured output that
      used to appear if the mons were low on disk space (which duplicated
      the information in the normal health warning messages) are now gone.
    - The `ceph -w` output no longer contains audit log entries by default.
      Add a `--watch-channel=audit` or `--watch-channel=*` to see them.
    - New "ceph -w" behavior - the "ceph -w" output no longer contains
      I/O rates, available space, pg info, etc. because these are no
      longer logged to the central log (which is what `ceph -w`
      shows). The same information can be obtained by running `ceph pg
      stat`; alternatively, I/O rates per pool can be determined using
      `ceph osd pool stats`. Although these commands do not
      self-update like `ceph -w` did, they do have the ability to
      return formatted output by providing a `--format=<format>`
      option.
    - Added new commands `pg force-recovery` and
      `pg-force-backfill`. Use them to boost recovery or backfill
      priority of specified pgs, so they're recovered/backfilled
      before any other. Note that these commands don't interrupt
      ongoing recovery/backfill, but merely queue specified pgs before
      others so they're recovered/backfilled as soon as possible. New
      commands `pg cancel-force-recovery` and `pg
      cancel-force-backfill` restore default recovery/backfill
      priority of previously forced pgs.

Major Changes from Jewel
------------------------

- *RADOS*:

  * We now default to the AsyncMessenger (`ms type = async`) instead
    of the legacy SimpleMessenger.  The most noticeable difference is
    that we now use a fixed sized thread pool for network connections
    (instead of two threads per socket with SimpleMessenger).
  * Some OSD failures are now detected almost immediately, whereas
    previously the heartbeat timeout (which defaults to 20 seconds)
    had to expire.  This prevents IO from blocking for an extended
    period for failures where the host remains up but the ceph-osd
    process is no longer running.
  * The size of encoded OSDMaps has been reduced.
  * The OSDs now quiesce scrubbing when recovery or rebalancing is in progress.

- *RGW*:

  * RGW now supports the S3 multipart object copy-part API.
  * It is possible now to reshard an existing bucket offline. Offline
    bucket resharding currently requires that all IO (especially
    writes) to the specific bucket is quiesced.  (For automatic online
    resharding, see the new feature in Luminous above.)
  * RGW now supports data compression for objects.
  * Civetweb version has been upgraded to 1.8
  * The Swift static website API is now supported (S3 support has been added
    previously).
  * S3 bucket lifecycle API has been added. Note that currently it only supports
    object expiration.
  * Support for custom search filters has been added to the LDAP auth
    implementation.
  * Support for NFS version 3 has been added to the RGW NFS gateway.
  * A Python binding has been created for librgw.

- *RBD*:

  * The rbd-mirror daemon now supports replicating dynamic image
    feature updates and image metadata key/value pairs from the
    primary image to the non-primary image.
  * The number of image snapshots can be optionally restricted to a
    configurable maximum.
  * The rbd Python API now supports asynchronous IO operations.

- *CephFS*:

  * libcephfs function definitions have been changed to enable proper
    uid/gid control.  The library version has been increased to reflect the
    interface change.
  * Standby replay MDS daemons now consume less memory on workloads
    doing deletions.
  * Scrub now repairs backtrace, and populates `damage ls` with
    discovered errors.
  * A new `pg_files` subcommand to `cephfs-data-scan` can identify
    files affected by a damaged or lost RADOS PG.
  * The false-positive "failing to respond to cache pressure" warnings have
    been fixed.


Upgrade from Jewel or Kraken
----------------------------
#. Ensure that the `sortbitwise` flag is enabled::
     # ceph osd set sortbitwise
#. Make sure your cluster is stable and healthy (no down or
   recoverying OSDs).  (Optional, but recommended.)
#. Do not create any new erasure-code pools while upgrading the monitors.
#. You can monitor the progress of your upgrade at each stage with the
   `ceph versions` command, which will tell you what ceph version is
   running for each type of daemon.
#. Set the `noout` flag for the duration of the upgrade. (Optional
   but recommended.)::
     # ceph osd set noout
#. Upgrade monitors by installing the new packages and restarting the
   monitor daemons.  Note that, unlike prior releases, the ceph-mon
   daemons *must* be upgraded first::
     # systemctl restart ceph-mon.target
   Verify the monitor upgrade is complete once all monitors are up by
   looking for the `luminous` feature string in the mon map.  For
   example::
     # ceph mon feature ls
   should include `luminous` under persistent features::
     on current monmap (epoch NNN)
        persistent: [kraken,luminous]
        required: [kraken,luminous]
#. Add or restart `ceph-mgr` daemons.  If you are upgrading from
   kraken, upgrade packages and restart ceph-mgr daemons with::
     # systemctl restart ceph-mgr.target
   If you are upgrading from kraken, you may already have ceph-mgr
   daemons deployed.  If not, or if you are upgrading from jewel, you
   can deploy new daemons with tools like ceph-deploy or ceph-ansible.
   For example::
     # ceph-deploy mgr create HOST
   Verify the ceph-mgr daemons are running by checking `ceph -s`::
     # ceph -s
     ...
       services:
        mon: 3 daemons, quorum foo,bar,baz
        mgr: foo(active), standbys: bar, baz
     ...
#. Upgrade all OSDs by installing the new packages and restarting the
   ceph-osd daemons on all hosts::
     # systemctl restart ceph-osd.target
   You can monitor the progress of the OSD upgrades with the new
   `ceph versions` or `ceph osd versions` command::
     # ceph osd versions
     {
        "ceph version 12.2.0 (...) luminous (stable)": 12,
        "ceph version 10.2.6 (...)": 3,
     }
#. Upgrade all CephFS daemons by upgrading packages and restarting
   daemons on all hosts::
     # systemctl restart ceph-mds.target
#. Upgrade all radosgw daemons by upgrading packages and restarting
   daemons on all hosts::
     # systemctl restart radosgw.target
#. Complete the upgrade by disallowing pre-luminous OSDs and enabling
   all new Luminous-only functionality::
     # ceph osd require-osd-release luminous
   If you set `noout` at the beginning, be sure to clear it with::
     # ceph osd unset noout
#. Verify the cluster is healthy with `ceph health`.


Upgrading from pre-Jewel releases (like Hammer)
-----------------------------------------------

You *must* first upgrade to Jewel (10.2.z) before attempting an
upgrade to Luminous.


Upgrade compatibility notes, Kraken to Luminous
-----------------------------------------------

* The configuration option `osd pool erasure code stripe width` has
  been replaced by `osd pool erasure code stripe unit`, and given
  the ability to be overridden by the erasure code profile setting
  `stripe_unit`. For more details see
  :ref:`erasure-code-profiles`.

* rbd and cephfs can use erasure coding with bluestore. This may be
  enabled by setting `allow_ec_overwrites` to `true` for a pool. Since
  this relies on bluestore's checksumming to do deep scrubbing,
  enabling this on a pool stored on filestore is not allowed.

* The `rados df` JSON output now prints numeric values as numbers instead of
  strings.

* The `mon_osd_max_op_age` option has been renamed to
  `mon_osd_warn_op_age` (default: 32 seconds), to indicate we
  generate a warning at this age.  There is also a new
  `mon_osd_err_op_age_ratio` that is a expressed as a multitple of
  `mon_osd_warn_op_age` (default: 128, for roughly 60 minutes) to
  control when an error is generated.

* The default maximum size for a single RADOS object has been reduced from
  100GB to 128MB.  The 100GB limit was completely impractical in practice
  while the 128MB limit is a bit high but not unreasonable.  If you have an
  application written directly to librados that is using objects larger than
  128MB you may need to adjust `osd_max_object_size`.

* The semantics of the `rados ls` and librados object listing
  operations have always been a bit confusing in that "whiteout"
  objects (which logically don't exist and will return ENOENT if you
  try to access them) are included in the results.  Previously
  whiteouts only occurred in cache tier pools.  In luminous, logically
  deleted but snapshotted objects now result in a whiteout object, and
  as a result they will appear in `rados ls` results, even though
  trying to read such an object will result in ENOENT.  The `rados
  listsnaps` operation can be used in such a case to enumerate which
  snapshots are present.
  This may seem a bit strange, but is less strange than having a
  deleted-but-snapshotted object not appear at all and be completely
  hidden from librados's ability to enumerate objects.  Future
  versions of Ceph will likely include an alternative object
  enumeration interface that makes it more natural and efficient to
  enumerate all objects along with their snapshot and clone metadata.

* The deprecated `crush_ruleset` property has finally been removed;
  please use  `crush_rule` instead for the `osd pool get ...` and `osd
  pool set ...` commands.

* The `osd pool default crush replicated ruleset` option has been
  removed and replaced by the `psd pool default crush rule` option.
  By default it is -1, which means the mon will pick the first type
  replicated rule in the CRUSH map for replicated pools.  Erasure
  coded pools have rules that are automatically created for them if
  they are not specified at pool creation time.

* We no longer test the FileStore ceph-osd backend in combination with
  btrfs.  We recommend against using btrfs.  If you are using
  btrfs-based OSDs and want to upgrade to luminous you will need to
  add the follwing to your ceph.conf::

    enable experimental unrecoverable data corrupting features = btrfs

  The code is mature and unlikely to change, but we are only
  continuing to test the Jewel stable branch against btrfs.  We
  recommend moving these OSDs to FileStore with XFS or BlueStore.
* The `ruleset-*` properties for the erasure code profiles have been
  renamed to `crush-*` to (1) move away from the obsolete 'ruleset'
  term and to be more clear about their purpose.  There is also a new
  optional `crush-device-class` property to specify a CRUSH device
  class to use for the erasure coded pool.  Existing erasure code
  profiles will be converted automatically when upgrade completes
  (when the `ceph osd require-osd-release luminous` command is run)
  but any provisioning tools that create erasure coded pools may need
  to be updated.
* The structure of the XML output for `osd crush tree` has changed
  slightly to better match the `osd tree` output.  The top level
  structure is now `nodes` instead of `crush_map_roots`.
* When assigning a network to the public network and not to
  the cluster network the network specification of the public
  network will be used for the cluster network as well.
  In older versions this would lead to cluster services
  being bound to 0.0.0.0:<port>, thus making the
  cluster service even more publicly available than the
  public services. When only specifying a cluster network it
  will still result in the public services binding to 0.0.0.0.

* In previous versions, if a client sent an op to the wrong OSD, the OSD
  would reply with ENXIO.  The rationale here is that the client or OSD is
  clearly buggy and we want to surface the error as clearly as possible.
  We now only send the ENXIO reply if the osd_enxio_on_misdirected_op option
  is enabled (it's off by default).  This means that a VM using librbd that
  previously would have gotten an EIO and gone read-only will now see a
  blocked/hung IO instead.

* The "journaler allow split entries" config setting has been removed.

* The 'mon_warn_osd_usage_min_max_delta' config option has been
  removed and the associated health warning has been disabled because
  it does not address clusters undergoing recovery or CRUSH rules that do
  not target all devices in the cluster.

* Added new configuration "public bind addr" to support dynamic
  environments like Kubernetes. When set the Ceph MON daemon could
  bind locally to an IP address and advertise a different IP address
  `public addr` on the network.

* The crush `choose_args` encoding has been changed to make it
  architecture-independent. If you deployed Luminous dev releases or
  12.1.0 rc release and made use of the CRUSH choose_args feature, you
  need to remove all choose_args mappings from your CRUSH map before
  starting the upgrade.


- *librados*:

  * Some variants of the omap_get_keys and omap_get_vals librados
    functions have been deprecated in favor of omap_get_vals2 and
    omap_get_keys2.  The new methods include an output argument
    indicating whether there are additional keys left to fetch.
    Previously this had to be inferred from the requested key count vs
    the number of keys returned, but this breaks with new OSD-side
    limits on the number of keys or bytes that can be returned by a
    single omap request.  These limits were introduced by kraken but
    are effectively disabled by default (by setting a very large limit
    of 1 GB) because users of the newly deprecated interface cannot
    tell whether they should fetch more keys or not.  In the case of
    the standalone calls in the C++ interface
    (IoCtx::get_omap_{keys,vals}), librados has been updated to loop on
    the client side to provide a correct result via multiple calls to
    the OSD.  In the case of the methods used for building
    multi-operation transactions, however, client-side looping is not
    practical, and the methods have been deprecated.  Note that use of
    either the IoCtx methods on older librados versions or the
    deprecated methods on any version of librados will lead to
    incomplete results if/when the new OSD limits are enabled.

  * The original librados rados_objects_list_open (C) and objects_begin
    (C++) object listing API, deprecated in Hammer, has finally been
    removed.  Users of this interface must update their software to use
    either the rados_nobjects_list_open (C) and nobjects_begin (C++) API or
    the new rados_object_list_begin (C) and object_list_begin (C++) API
    before updating the client-side librados library to Luminous.
    Object enumeration (via any API) with the latest librados version
    and pre-Hammer OSDs is no longer supported.  Note that no in-tree
    Ceph services rely on object enumeration via the deprecated APIs, so
    only external librados users might be affected.
    The newest (and recommended) rados_object_list_begin (C) and
    object_list_begin (C++) API is only usable on clusters with the
    SORTBITWISE flag enabled (Jewel and later).  (Note that this flag is
    required to be set before upgrading beyond Jewel.)

- *CephFS*:

  * When configuring ceph-fuse mounts in /etc/fstab, a new syntax is
    available that uses "ceph.<arg>=<val>" in the options column, instead
    of putting configuration in the device column.  The old style syntax
    still works.  See the documentation page "Mount CephFS in your
    file systems table" for details.
  * CephFS clients without the 'p' flag in their authentication capability
    string will no longer be able to set quotas or any layout fields.  This
    flag previously only restricted modification of the pool and namespace
    fields in layouts.
  * CephFS will generate a health warning if you have fewer standby daemons
    than it thinks you wanted.  By default this will be 1 if you ever had
    a standby, and 0 if you did not.  You can customize this using
    `ceph fs set <fs> standby_count_wanted <number>`.  Setting it
    to zero will effectively disable the health check.
  * The "ceph mds tell ..." command has been removed.  It is superceded
    by "ceph tell mds.<id> ..."
  * The `apply` mode of cephfs-journal-tool has been removed

Getting Ceph
------------

* Git at git://github.com/ceph/ceph.git
* Tarball at http://download.ceph.com/tarballs/ceph-12.2.0.tar.gz
* For packages, see http://docs.ceph.com/docs/master/install/get-packages/
* For ceph-deploy, see http://docs.ceph.com/docs/master/install/install-ceph-deploy
* Release git sha1: 32ce2a3ae5239ee33d6150705cdb24d43bab910c

--
Abhishek Lekshmanan
SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton,
HRB 21284 (AG Nürnberg)
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