Pacemaker Devel / file revision

 <?xml version="1.0" encoding="UTF-8" ?>

 <!--

 GLOBAL TODOs:

 Versionize DTD so we can validate against a specific version

 Background

  The CIB is described quite well in section 5 of the crm.txt (checked into CVS in the crm directory) so it is not repeated here.

  Suffice to say that it stores the configuration and runtime data required for cluster-wide resource management in XML format.

 CIB: Information Structure

  The CIB is divided into two main sections: The "static" configuration part and the "dynamic" status.

  The configuration contains - surprisingly - the configuration of the cluster, namely node attributes, resource instance configuration, and the constraints which describe the dependencies between all these.

  To identify the most recent configuration available in the cluster, this section is time-stamped with the unique timestamp of the last update.

  The status part is dynamically generated / updated by the CRM system and represents the current status of the cluster; which nodes are up, down or crashed, which resources are running where etc.

  Every information carrying object has an "id" tag, which is basically the UUID of it, should we ever need to access it directly.

  Unless otherwise stated, the id field is a short name consisting simple ascii characters [a-zA-Z0-9_\-]

  The exception is for resources because the LRM can support only id's of up to 64 characters.

 Other Notes

  The description field in all elements is opaque to the CRM and is for administrative comments.

 TODO

  * Figure out a sane way to version the DTD

  * Do we need to know about ping nodes...?

  * The integer comparison type really should be number

 -->

 <!ELEMENT cib (configuration, status)>

 <!ATTLIST cib

           cib-last-written CDATA        #IMPLIED

           admin_epoch  CDATA        #REQUIRED

           epoch        CDATA        #REQUIRED

           num_updates  CDATA        #REQUIRED

           num_peers    CDATA        #IMPLIED        

           cib_feature_revision  CDATA   #IMPLIED

           crm_feature_set       CDATA   #IMPLIED

           remote_access_port    CDATA   #IMPLIED        

           dc_uuid        CDATA             #IMPLIED

           ccm_transition CDATA             #IMPLIED

           have_quorum    (true|yes|1|false|no|0)  'false'

           ignore_dtd     (true|yes|1|false|no|0)  #IMPLIED

           validate-with  CDATA    #IMPLIED        

           generated      CDATA    #IMPLIED        

           crm-debug-origin CDATA    #IMPLIED>

 <!--

 The CIB's version is a tuple of admin_epoch, epoch and num_updates (in that order).

 This is used when applying updates from the master CIB instance.

 Additionally, num_peers and have_quorum are used during the election process to determin who has the latest configuration.

  * num_updates is incremented every time the CIB changes.

  * epoch is incremented after every DC election.

  * admin_epoch is exclusivly for the admin to change.

  * num_peers is the number of CIB instances that we can talk to

  * have_quorum is derived from the ConsensusClusterMembership layer

  * dc_uuid stored the UUID of the current DesignatedController

  * ccm_transition stores the membership instance from the ConsensusClusterMembership layer.

  * cib_feature_revision is the feature set that this configuration requires

 -->

 <!ELEMENT configuration (crm_config, nodes, resources, constraints)>

 <!--

 crm_config

 Used to specify cluster-wide options.

 The use of multiple cluster_property_set sections and time-based rule expressions allows the the cluster to behave differently (for example) during buisness hours than it does overnight.

 -->

 <!ELEMENT crm_config (cluster_property_set)*>

 <!--

 Current crm_config options:

  * transition_idle_timeout (interval, default=60s):

    If no activity is recorded in this time, the transition is deemed failed as are all sent actions that have not yet been confirmed complete.

    If any operation initiated has an explicit higher timeout, the higher value applies.

  * symmetric_cluster (boolean, default=TRUE):

    If true, resources are permitted to run anywhere by default.

    Otherwise, explicit constraints must be created to specify where they can run.

  * stonith_enabled (boolean, default=FALSE):

    If true, failed nodes will be fenced.

  * no_quorum_policy (enum, default=stop)

    * ignore - Pretend we have quorum

    * freeze - Do not start any resources not currently in our partition.

      Resources in our partition may be moved to another node within the partition

      Fencing is disabled

    * stop - Stop all running resources in our partition

      Fencing is disabled

  * default_resource_stickiness

    Do we prefer to run on the existing node or be moved to a "better" one?

    * 0 : resources will be placed optimally in the system.

      This may mean they are moved when a "better" or less loaded node becomes available.

      This option is almost equivalent to auto_failback on except that the resource may be moved to other nodes than the one it was previously active on.

    * value > 0 : resources will prefer to remain in their current location but may be moved if a more suitable node is available.

      Higher values indicate a stronger preference for resources to stay where they are.

    * value < 0 : resources prefer to move away from their current location.

      Higher absolute values indicate a stronger preference for resources to be moved.

    * INFINITY : resources will always remain in their current locations until forced off because the node is no longer eligible to run the resource (node shutdown, node standby or configuration change).

      This option is almost equivalent to auto_failback off except that the resource may be moved to other nodes than the one it was previously active on.

    * -INFINITY : resources will always move away from their current location.

  * is_managed_default (boolean, default=TRUE)

    Unless the resource's definition says otherwise,

    * TRUE : resources will be started, stopped, monitored and moved as necessary/required

    * FALSE : resources will not started if stopped, stopped if started nor have any recurring actions scheduled.

  * stop_orphan_resources (boolean, default=TRUE (as of release 2.0.6))

    If a resource is found for which we have no definition for;

    * TRUE : Stop the resource

    * FALSE : Ignore the resource

    This mostly effects the CRM's behavior when a resource is deleted by an admin without it first being stopped.

  * stop_orphan_actions (boolean, default=TRUE)

    If a recurring action is found for which we have no definition for;

    * TRUE : Stop the action

    * FALSE : Ignore the action

    This mostly effects the CRM's behavior when the interval for a recurring action is changed.

 -->

 <!ELEMENT cluster_property_set (rule*, attributes)>

 <!ATTLIST cluster_property_set

           id                CDATA        #REQUIRED

           score             CDATA        #IMPLIED>

 <!ELEMENT nodes       (node*)>

 <!--

  * id    : the node's UUID.

  * uname : the result of uname -n

  * type  : should either be "normal" or "member" for nodes you with to run resources 

    "normal" is preferred as of version 2.0.4

 Each node can also have additional "instance" attributes.

 These attributes are completely arbitrary and can be used later in constraints.

 In this way it is possible to define groups of nodes to which a constraint can apply.

 It is also theoretically possible to have a process on each node which updates these values automatically.

 This would make it possible to have an attribute that represents "connected to SAN subsystem" or perhaps "system_load (low|medium|high)".

 Ideally it would be possible to have the CRMd on each node gather some of this information and automatically populate things like architecture and OS/kernel version.

 -->

 <!ELEMENT node (instance_attributes*)>

 <!ATTLIST node

           id            CDATA         #REQUIRED

           uname         CDATA         #REQUIRED

           description   CDATA         #IMPLIED

           type          (normal|member|ping) #REQUIRED>

 <!ELEMENT resources   (primitive|group|clone|master_slave)*>

 <!--

  * class

    Specifies the location and standard the resource script conforms to

    * ocf

      Most OCF RAs started out life as v1 Heartbeat resource agents.

      These have all been ported to meet the OCF specifications.

      As an added advantage, in accordance with the OCF spec, they also describe the parameters they take and what their defaults are.

      It is also easier to configure them as each part of the configuration is passed as its own parameter.

      In accordance with the OCF spec, each parameter is passed to the RA with an OCF_RESKEY_ prefix.

      So ip=192.168.1.1 in the CIB would be passed as OCF_RESKEY_ip=192.168.1.1.

      Located under /usr/lib/ocf/resource.d/heartbeat/.

    * lsb

      Most Linux init scripts conform to the LSB specification.

      The class allows you to use those that do as resource agents controlled by Heartbeat.

      Located in /etc/init.d/.

    * heartbeat

      This class gives you access to the v1 Heartbeat resource agents and allows you to reuse any custom agents you may have written.

      Located at /etc/heartbeat/resource.d/ or /etc/ha.d/resource.d.

  * type : The name of the ResourceAgent you wish to use.

  * provider

    The OCF spec allows multiple vendors to supply the same ResourceAgent.

    To use the OCF resource agents supplied with Heartbeat, you should specify heartbeat here

  * is_managed : Is the ClusterResourceManager in control of this resource.

    * true : (default) the resource will be started, stopped, monitored and moved as necessary/required

    * false : the resource will not started if stopped, stopped if started nor have any recurring actions scheduled.

      The resource may still be referenced in colocation constraints and ordering constraints (though obviously if no actions are performed on it then it will prevent the action on the other resource too)

  * restart_type

    Used when the other side of an ordering dependency is restarted/moved.

    * ignore : the default.

      Don't do anything extra.

    * restart

      Use this for example to have a restart of your database also trigger a restart of your web-server.

    * multiple_active

      Used when a resource is detected as being active on more than one machine.

      The default value, stop_start, will stop all instances and start only 1

    * block : don't do anything, wait for the administrator

    * stop_only : stop all the active instances

    * stop_start : start the resource on one node after having stopped all the active instances

  * resource_stickiness

    See the description of the default_resource_stickiness cluster attribute.

    resource_stickiness allows you to override the cluster's default for the individual resource.

 NOTE: primitive resources may contain at most one "operations" object.

       The CRM will complain about your configuration if this criteria is not met.

       Please use crm_verify to ensure your configuration is valid.

       The DTD is written this way to be order in-sensitive.

 -->

 <!ELEMENT primitive (operations|meta_attributes|instance_attributes)*>

 <!ATTLIST primitive

           id                CDATA        #REQUIRED

           description       CDATA        #IMPLIED

           class             (ocf|lsb|heartbeat|stonith) #REQUIRED

           type              CDATA        #REQUIRED

           provider          CDATA        #IMPLIED

           is_managed            CDATA                            #IMPLIED

           restart_type          (ignore|restart)                 'ignore'

           multiple_active       (stop_start|stop_only|block)     'stop_start'

           resource_stickiness   CDATA                             #IMPLIED>

 <!--

 This allows us to specify how long an action can take

  * name : the name of the operation.

    Supported operations are start, stop, & monitor

  * start_delay : delay the operation after starting the resource

    By default this value is in milliseconds, however you can also specify a value in seconds like so timeout="5s". Used for the monitor operation.

  * timeout : the maximum period of time before considering the action failed.

    By default this value is in milliseconds, however you can also specify a value in seconds like so timeout="5s".

  * interval : This currently only applies to monitor operations and specifies how often the LRM should check the resource is active.

    The same notation for timeout applies.

  * prereq : What conditions need to be met before this action can be run

    * nothing : This action can be performed at any time

    * quorum : This action requires the partition to have quorum

    * fencing : This action requires the partition to have quorum and any fencing operations to have completed before it can be executed

  * on_fail : The action to take if this action ever fails.

    * nothing : Pretend the action didnt actually fail

    * block : Take no further action on the resource - wait for the administrator to resolve the issue

    * restart : Stop the resource and re-allocate it elsewhere

    * stop : Stop the resource and DO NOT re-allocate it elsewhere

    * fence : Currently this means fence the node on which the resource is running.

      Any other resources currently active on the machine will be migrated away before fencing occurs.

 Only one entry per supported action+interval is currently permitted.

 Parameters specific to each operation can be passed using the instance_attributes section.

 -->

 <!ELEMENT operations (op*)>

 <!ELEMENT op (meta_attributes|instance_attributes)*>

 <!ATTLIST op

           id            CDATA         #REQUIRED

           name          CDATA         #REQUIRED

           description   CDATA         #IMPLIED

           interval      CDATA         #IMPLIED

           timeout       CDATA         #IMPLIED

           start_delay   CDATA         '0'

           disabled      (true|yes|1|false|no|0)        'false'

           role          (Master|Slave|Started|Stopped) 'Started'

           prereq        (nothing|quorum|fencing)       #IMPLIED

           on_fail       (ignore|block|stop|restart|fence)     #IMPLIED>

 <!--

 Use this to emulate v1 type Heartbeat groups.

 Defining a resource group is a quick way to make sure that the resources:

  * are all started on the same node, and

  * are started and stopped in the correct (sequential) order

 though either or both of these properties can be disabled.

 NOTE: Do not create empty groups.  

       They are temporarily supported because the GUI requires it but will be removed as soon as possible.

       The DTD is written this way to be order in-sensitive.

 -->

 <!ELEMENT group (meta_attributes|instance_attributes|primitive)*>

 <!ATTLIST group

           id            CDATA               #REQUIRED

           description   CDATA               #IMPLIED

           is_managed            CDATA                         #IMPLIED

           restart_type          (ignore|restart)              'ignore'

           multiple_active       (stop_start|stop_only|block)  'stop_start'

           resource_stickiness   CDATA			      #IMPLIED

           ordered               (true|yes|1|false|no|0)       'true'

           collocated            (true|yes|1|false|no|0)       'true'>

 <!--

 Clones are intended as a mechanism for easily starting a number of resources (such as a web-server) with the same configuration.

 As an added benefit, the number that should be started is an instance parameter and when combined with time-based constraints, allows the administrator to run more instances during peak times and save on resources during idle periods.

  * ordered

    Start (or stop) each clone only after the operation on the previous clone completed.

  * interleaved

    If a colocation constraint is created between two clone resources and interleaved is true, then clone N from one resource will be assigned the same location as clone N from the other resource.

    If the number of runnable clones differs, then the leftovers can be located anywhere.

 Using a cloned group is a much better way of achieving the same result.

  * notify

    If true, inform peers before and after any clone is stopped or started.

    If an action failed, you will (currently) not recieve a post-notification.

    Instead you can next expect to see a pre-notification for a stop.

    If a stop fails, and you have fencing you will get a post-notification for the stop after the fencing operation has completed.

    In order to use the notification service ALL decendants of the clone MUST support the notify action.

    Currently this action is not permitted to fail, though depending on your configuration, can block almost indefinitly.

    Behaviour in response to a failed action or notificaiton is likely to be improved in future releases.

    See http://linux-ha.org/v2/Concepts/Clones for more information on notify actions

 NOTE: Clones must contain exactly one primitive or one group resource. 

       The CRM will complain about your configuration if this criteria is not met.

       Please use crm_verify to ensure your configuration is valid.

       The DTD is written this way to be order in-sensitive.

 -->

 <!ELEMENT clone (meta_attributes|instance_attributes|primitive|group)*>

 <!ATTLIST clone

           id            CDATA               #REQUIRED

           description   CDATA               #IMPLIED

           is_managed            CDATA                         #IMPLIED

           restart_type          (ignore|restart)              'ignore'

           multiple_active       (stop_start|stop_only|block)  'stop_start'

           resource_stickiness   CDATA                         #IMPLIED

           notify                (true|yes|1|false|no|0)       'false'

           globally_unique       (true|yes|1|false|no|0)       'true'

           ordered               (true|yes|1|false|no|0)       'false'

           interleave            (true|yes|1|false|no|0)       'false'>

 <!--

 Master/Slave resources are a superset of Clones in that instances can also be in one of two states.

 The meaning of the states is specific to the resource.

 NOTE: master_slave must contain exactly one primitive resource OR one group resource.

       It may not contain both, nor may it contain neither.

       The CRM will complain about your configuration if this criteria is not met.

       Please use crm_verify to ensure your configuration is valid.

       The DTD is written this way to be order in-sensitive.

 -->

 <!ELEMENT master_slave (meta_attributes|instance_attributes|primitive|group)*>

 <!ATTLIST master_slave

           id            CDATA       #REQUIRED

           description   CDATA       #IMPLIED

           is_managed            CDATA                         #IMPLIED

           restart_type          (ignore|restart)              'ignore'

           multiple_active       (stop_start|stop_only|block)  'stop_start'

           resource_stickiness   CDATA                         #IMPLIED

           notify                (true|yes|1|false|no|0)       'false'

           globally_unique       (true|yes|1|false|no|0)       'true'

           ordered               (true|yes|1|false|no|0)       'false'

           interleave            (true|yes|1|false|no|0)       'false'>

 <!--

 Most resource options are configured as instance attributes.

 Some of the built-in options can be configured directly on the resource or as an instance attribute.

 The advantage of using instance attributes is the added flexibility that can be achieved through conditional ?<rule/>s (see below).

 You can have multiple sets of 'instance attributes', they are first sorted by score and then processed.

 The first to have its ?<rule/> satisfied and define an attribute wins.

 Subsequent values for the attribute will be ignored.

 Note that:

  * instance_attributes sets with id equal to cib-bootstrap-options are treated as if they have a score of INFINITY.

  * instance_attributes sets with no score implicitly have a score of zero.

  * instance_attributes sets with no rule implicitly have a rule that evaluates to true.

 The addition of conditional <rule/>s to the instance_attributes object allows for an infinite variety of configurations.

 Just some of the possibilities are:

  * Specify different resource parameters

    * depending on the node it is allocated to (a resource may need to use eth1 on host1 but eth0 on host2)

    * depending on the time of day (run 10 web-servers at night an 100 during the day)

  * Allow nodes to have different attributes depending on the time-of-day

    * Set resource_stickiness to avoid failback during business hours but allow resources to be moved to a more preferred node on the weekend

    * Switch a node between a "front-end" processing group during the day to a "back-end" group at night.

 Common instance attributes for all resource types:

  * priority (integer, default=0):

    dictates the order in which resources will be processed.

    If there is an insufficient number of nodes to run all resources, the lower priority resources will be stopped to make sure the higher priority resources remain active.

  * is_managed: See previous description.

  * resource_stickiness: See previous description.

  * target_role: (Started|Stopped|Master|Slave|default, default=#default)

    * #default : Let the cluster decide what to do with the resource

    * Started : Ignore any specified value of is_managed or is_managed_default and attempt to start the resource

    * Stopped : Ignore any specified value of is_managed or is_managed_default and attempt to stop the resource

    * Master : Ignore any specified value of is_managed, is_managed_default or promotion preferences and attempt to put all instances of a cloned resource into Master mode.

    * Slave : Ignore any specified value of is_managed, is_managed_default or promotion preferences and attempt to put all instances of a cloned resource into Slave mode.

 Common instance attributes for clones:

  * clone_max (integer, default=1):

    the number of clones to be run

 * clone_node_max (integer, default=1):

   the maximum number of clones to be run on a single node

 Common instance attributes for nodes:

  * standby (boolean, default=FALSE)

    if TRUE, indicates that resources can not be run on the node

 -->

 <!ELEMENT instance_attributes (rule*, attributes)>

 <!ATTLIST instance_attributes

           id                CDATA        #REQUIRED

           score             CDATA        #IMPLIED>

 <!ELEMENT meta_attributes (rule*, attributes)>

 <!ATTLIST meta_attributes

           id                CDATA        #REQUIRED

           score             CDATA        #IMPLIED>

 <!--

 Every constraint entry also has a 'lifetime' attribute, which expresses when this constraint is applicable.

 For example, a constraint may only be valid during certain times of the day, or days of the week.

 Eventually, we would like to be able to support constraints that only last until events such as the next reboot or the next transition.

 -->

 <!ELEMENT constraints (rsc_order|rsc_colocation|rsc_location)*>

 <!--

 rsc_ordering constraints express dependencies between the actions on two resources.

  * from : A resource id

  * action : What action does this constraint apply to.

  * type : Should the action on from occur before or after action on to

  * to : A resource id

  * symmetrical : If TRUE, create the reverse constraint for the other action also.

 Read as:

      action from type to_action to

 eg. 

      start rsc1 after promote rsc2

 -->

 <!ELEMENT rsc_order (lifetime?)>

 <!ATTLIST rsc_order

           id        CDATA #REQUIRED

           from      CDATA #REQUIRED

           to        CDATA #REQUIRED

           action    CDATA		'start'

           to_action CDATA		'start'

           type      (before|after)	'after'

           score     CDATA		'INFINITY'

           symmetrical (true|yes|1|false|no|0)	'true'>

 <!--

 Specify where a resource should run relative to another resource

 Make rsc 'from' run on the same machine as rsc 'to'

 If rsc 'to' cannot run anywhere and 'score' is INFINITY, 

   then rsc 'from' wont be allowed to run anywhere either

 If rsc 'from' cannot run anywhere, then 'to' wont be affected

 -->

 <!ELEMENT rsc_colocation (lifetime?)>

 <!ATTLIST rsc_colocation

           id             CDATA #REQUIRED

           from           CDATA #REQUIRED

           from_role      CDATA #IMPLIED

           to             CDATA #REQUIRED

           to_role        CDATA #IMPLIED

           symmetrical    (true|yes|1|false|no|0)	'false'

           node_attribute CDATA #IMPLIED

           score          CDATA #REQUIRED>

 <!--

 Specify which nodes are eligible for running a given resource.

 During processing, all rsc_location for a given rsc are evaluated.

 All nodes start out with their base weight (which defaults to zero).

 This can then be modified (up or down) using any number of rsc_location constraints.

 Then the highest non-zero available node is determined to place the resource.

 If multiple nodes have the same weighting, the node with the fewest running resources is chosen.

 The rsc field is, surprisingly, a resource id.

 -->

 <!ELEMENT rsc_location (lifetime?,rule*)>

 <!ATTLIST rsc_location

           id          CDATA #REQUIRED

           description CDATA #IMPLIED

           rsc         CDATA #REQUIRED

           node        CDATA #IMPLIED

           score       CDATA #IMPLIED>

 <!ELEMENT lifetime (rule+)>

 <!ATTLIST lifetime id  CDATA     #REQUIRED>

 <!--

  * boolean_op

    determines how the results of multiple expressions are combined.

  * role

    limits this rule to applying to Multi State resources with the named role.

    Roles include Started, Stopped, Slave, Master though only the last two are considered useful.

    NOTE: A rule with role="Master" can not determin the initial location of a clone instance.

    It will only affect which of the active instances will be promoted.

  * score

    adjusts the preference for running on the matched nodes.

    NOTE: Nodes that end up with a negative score will never run the resource.

    Two special values of "score" exist: INFINITY and -INFINITY.

    Processing of these special values is as follows:

       INFINITY +/- -INFINITY : -INFINITY

       INFINITY +/-  int      :  INFINITY

      -INFINITY +/-  int      : -INFINITY

  * score_attribute 

    an alternative to the score attribute that provides extra flexibility.

   Each node matched by the rule has its score adjusted differently, according to its value for the named node attribute.

   Thus in the example below, if score_attribute="installed_ram" and nodeA would have its preference to run "the resource" increased by 1024 whereas nodeB would have its preference increased only by half as much.

     <nodes>

       <node id="uuid1" uname="nodeA" type="normal">

         <instance_attributes id="uuid1:custom_attrs">

           <attributes>

             <nvpair id="uuid1:installed_ram" name="installed_ram" value="1024"/>

             <nvpair id="uuid1:my_other_attr" name="my_other_attr" value="bob"/>

           </attributes>

         </instance_attributes>

       </node>

       <node id="uuid2" uname="nodeB" type="normal">

         <instance_attributes id="uuid2:custom_attrs">

           <attributes>

             <nvpair id="uuid2:installed_ram" name="installed_ram" value="512"/>

           </attributes>

         </instance_attributes>

       </node>

     </nodes>

 -->

 <!ELEMENT rule (expression|date_expression|rule)*>

 <!ATTLIST rule

           id                  CDATA          #REQUIRED

           role                CDATA          #IMPLIED

           score               CDATA          #IMPLIED

           score_attribute     CDATA          #IMPLIED

           boolean_op          (or|and)      'and'>

 <!--

 Returns TRUE or FALSE depending on the properties of the object being tested.

  * type determines how the values being tested.

    * integer Values are converted to floats before being compared.

    * version The "version" type is intended to solve the problem of comparing 1.2 and 1.10

    * string Uses strcmp

 Two built-in attributes are node id #id and node uname #uname so that:

       attribute=#id value=8C05CA5C-C9E3-11D8-BEE6-000A95B71D78 operation=eq, and

       attribute=#uname value=test1 operation=eq

 would both be valid tests.

 An extra built-in attribute called #is_dc will be set to true or false depending on whether the node is operating as the DC for the cluster.

 Valid tests using this test would be of the form:

         attribute=#is_dc operation=eq value=true,  and

         attribute=#is_dc operation=eq value=false, and

         attribute=#is_dc operation=ne value=false

                         (for those liking double negatives :))

 -->

 <!ELEMENT expression EMPTY>

 <!ATTLIST expression

           id         CDATA                    #REQUIRED

           attribute  CDATA                    #REQUIRED

           operation  (lt|gt|lte|gte|eq|ne|defined|not_defined) #REQUIRED

           value      CDATA                    #IMPLIED

           type       (number|string|version) 'string'>

 <!--

  * start : A date-time conforming to the ISO8601 specification.

  * end : A date-time conforming to the ISO8601 specification.

    A value for end may, for any usage, be omitted and instead inferred using start and duration.

  * operation

    * gt : Compares the current date-time with start date.

      Checks now > start.

    * lt : Compares the current date-time with end date.

      Checks end > now

    * in_range : Compares the current date-time with start and end.

      Checks now > start and end > now.

      If either start or end is omitted, then that part of the comparision is not performed.

    * date_spec : Performs a cron-like comparision between the contents of date_spec and now.

      If values for start and/or end are included, now must also be within that range.

      Or in other words, the date_spec operation can also be made to perform an extra in_range check.

 NOTE: Because the comparisions (except for date_spec) include the time, the eq, neq, gte and lte operators have not been implemented.

 -->

 <!ELEMENT date_expression (date_spec?,duration?)>

 <!ATTLIST date_expression

         id         CDATA  #REQUIRED

         operation  (in_range|date_spec|gt|lt) 'in_range'

         start      CDATA  #IMPLIED

         end        CDATA  #IMPLIED>

 <!--

 date_spec is used for (surprisingly  ) date_spec operations.

 Fields that are not supplied are ignored.

 Fields can contain a single number or a single range.

 Eg.

 monthdays="1" (Matches the first day of every month) and hours="09-17" (Matches hours between 9am and 5pm inclusive) are both valid values.

 weekdays="1,2" and weekdays="1-2,5-6" are NOT valid ranges.

 This may change in a future release.

  * seconds : Value range 0-59

  * minutes : Value range 0-59

  * hours : Value range 0-23

  * monthdays : Value range 0-31 (depending on current month and year)

  * weekdays : Value range 1-7 (1=Monday, 7=Sunday)

  * yeardays : Value range 1-366 (depending on current year)

  * months : Value range 1-12

  * weeks : Value range 1-53 (depending on weekyear)

  * weekyears : Value range 0...

   (NOTE: weekyears may differ from Gregorian years.

   Eg. 2005-001 Ordinal == 2005-01-01 Gregorian == 2004-W53-6 Weekly )

  * years : Value range 0...

  * moon : Value range 0..7 - 0 is new, 4 is full moon.

    Because we can(tm)

 -->

 <!ELEMENT date_spec EMPTY>

 <!ATTLIST date_spec

         id         CDATA  #REQUIRED

         hours      CDATA  #IMPLIED

         monthdays  CDATA  #IMPLIED

         weekdays   CDATA  #IMPLIED

         yeardays   CDATA  #IMPLIED

         months     CDATA  #IMPLIED

         weeks      CDATA  #IMPLIED

         weekyears  CDATA  #IMPLIED

         years      CDATA  #IMPLIED

         moon       CDATA  #IMPLIED>

 <!--

 duration is optionally used for calculating a value for end.

 Any field not supplied is assumed to be zero and ignored.

 Negative values might work.

 Eg. months=11 should be equivalent to writing years=1, months=-1 but is not encouraged.

 -->

 <!ELEMENT duration EMPTY>

 <!ATTLIST duration

         id         CDATA  #REQUIRED

         hours      CDATA  #IMPLIED

         monthdays  CDATA  #IMPLIED

         weekdays   CDATA  #IMPLIED

         yeardays   CDATA  #IMPLIED

         months     CDATA  #IMPLIED

         weeks      CDATA  #IMPLIED

         years      CDATA  #IMPLIED>

 <!--

 Example 1: True if now is any time in the year 2005.

 <rule id="rule1">

   <date_expression id="date_expr1" start="2005-001" operation="in_range">

     <duration years="1"/>

   </date_expression>

 </rule>

 Example 2: Equivalent expression.

 <rule id="rule2">

   <date_expression id="date_expr2" operation="date_spec">

     <date_spec years="2005"/>

   </date_expression>

 </rule>

 Example 3: 9am-5pm, Mon-Friday

 <rule id="rule3">

   <date_expression id="date_expr3" operation="date_spec">

     <date_spec hours="9-16" days="1-5"/>

   </date_expression>

 </rule>

 Example 4: 9am-5pm, Mon-Friday, or all day saturday

 <rule id="rule4" boolean_op="or">

   <date_expression id="date_expr4-1" operation="date_spec">

     <date_spec hours="9-16" days="1-5"/>

   </date_expression>

   <date_expression id="date_expr4-2" operation="date_spec">

     <date_spec days="6"/>

   </date_expression>

 </rule>

 Example 5: 9am-5pm or 9pm-12pm, Mon-Friday

 <rule id="rule5" boolean_op="and">

   <rule id="rule5-nested1" boolean_op="or">

     <date_expression id="date_expr5-1" operation="date_spec">

       <date_spec hours="9-16"/>

     </date_expression>

     <date_expression id="date_expr5-2" operation="date_spec">

       <date_spec hours="21-23"/>

     </date_expression>

   </rule>

   <date_expression id="date_expr5-3" operation="date_spec">

     <date_spec days="1-5"/>

   </date_expression>

 </rule>

 Example 6: Mondays in March 2005

 <rule id="rule6" boolean_op="and">

   <date_expression id="date_expr6" operation="date_spec" start="2005-03-01" end="2005-04-01">

     <date_spec weekdays="1"/>

   </date_expression>

 </rule>

 NOTE: Because no time is specified, 00:00:00 is implied.

 This means that the range includes all of 2005-03-01 but none of 2005-04-01.

 You may wish to write end="2005-03-31T23:59:59" to avoid confusion.

 Example 7: Friday the 13th if it is a full moon

 <rule id="rule7" boolean_op="and">

   <date_expression id="date_expr7" operation="date_spec">

     <date_spec weekdays="5" monthdays="13" moon="4"/>

   </date_expression>

 </rule>

 -->

 <!--

 You don't have to give a value.

 There's a difference between a key not being present and a key not having a value.

 -->

 <!ELEMENT nvpair EMPTY>

 <!ATTLIST nvpair

           id     CDATA  #REQUIRED

           name   CDATA  #REQUIRED

           value  CDATA  #IMPLIED>

 <!ELEMENT attributes (nvpair*)>

 <!--

 These attributes take effect only if no value has previously been applied as part of the node's definition.

 Additionally, when the node reboots all settings made here are erased.

 id must be the UUID of the node.

 -->

 <!ELEMENT transient_attributes (instance_attributes*)>

 <!ATTLIST transient_attributes id CDATA #IMPLIED>

 <!--=========== Status - Advanced Use Only ===========-->

 <!--

 Details about the status of each node configured.

 HERE BE DRAGONS

 Never, ever edit this section directly or using cibadmin.

 The consequences of doing so are many and varied but rarely ever good or what you anticipated.

 To discourage this, the status section is no longer even written to disk, and is always discarded at startup.

 To avoid duplication of data, state entries only carry references to nodes and resources.

 -->

 <!ELEMENT status (node_state*)>

 <!--

 The state of a given node.

 This information is updated by the DC based on inputs from sources such as the CCM, status messages from remote LRMs and requests from other nodes.

  * id       -  is the node's UUID.

  * uname    - is the result of uname -n for the node.

  * crmd     - records whether the crmd process is running on the node

  * in_ccm   - records whether the node is part of our membership partition

  * join     - is the node's membership status with the current DC.

  * expected - is the DC's expectation of whether the node is up or not.

  * shutdown - is set to the time at which the node last asked to be shut down

 Ideally, there should be a node_state entry for every entry in the <nodes> list.

 -->

 <!ELEMENT node_state (transient_attributes|lrm)*>

 <!ATTLIST node_state

         id              CDATA                   #REQUIRED

         uname           CDATA                   #REQUIRED

         ha              (active|dead)           #IMPLIED

         crmd            (online|offline)        'offline'

         join            (pending|member|down)   'down'

         expected        (pending|member|down)   'down'

         in_ccm          (true|yes|1|false|no|0) 'false'

         crm-debug-origin CDATA                  #IMPLIED

         shutdown        CDATA                   #IMPLIED

         clear_shutdown  CDATA                   #IMPLIED>

 <!--

 Information from the Local Resource Manager of the node.

 It contains a list of all resource's added (but not necessarily still active) on the node.

 -->

 <!ELEMENT lrm (lrm_resources)>

 <!ATTLIST lrm id CDATA #REQUIRED>

 <!ELEMENT lrm_resources (lrm_resource*)>

 <!ELEMENT lrm_resource (lrm_rsc_op*)>

 <!ATTLIST lrm_resource

           id            CDATA #REQUIRED

           class             (lsb|ocf|heartbeat|stonith) #REQUIRED

           type              CDATA        #REQUIRED

           provider          CDATA        #IMPLIED>

 <!--

 lrm_rsc_op (Resource Status)

 id: Set to [operation] +"_"+ [operation] +"_"+ [an_interval_in_milliseconds]

 operation typically start, stop, or monitor

 call_id: Supplied by the LRM, determins the order of in which lrm_rsc_op objects should be processed in order to determin the resource's true state

 rc_code is the last return code from the resource

 rsc_state is the state of the resource after the action completed and should be used as a guide only.

 transition_key contains an identifier and seqence number for the transition.

 At startup, the TEngine registers the identifier and starts the sequence at zero.

 It is used to identify the source of resource actions.

 transition_magic contains an identifier containing call_id, rc_code, and {{transition_key}}}.

 As the name suggests, it is a piece of magic that allows the TE to always identify the action from the stream of xml-diffs it subscribes to from the CIB.

 last_run       ::= when did the op run (as age)

 last_rc_change ::= last rc change (as age)

 exec_time      ::= time it took the op to run

 queue_time     ::= time spent in queue

 op_status is supplied by the LRM and conforms to this enum:

 typedef enum {

         LRM_OP_PENDING = -1,

         LRM_OP_DONE,

         LRM_OP_CANCELLED,

         LRM_OP_TIMEOUT,

         LRM_OP_NOTSUPPORTED,

         LRM_OP_ERROR,

 } op_status_t;

 The parameters section allows us to detect when a resource's definition has changed and the needs to be restarted (so the changes take effect).

 -->

 <!ELEMENT lrm_rsc_op EMPTY>

 <!ATTLIST lrm_rsc_op

           id                    CDATA #REQUIRED

           operation             CDATA #REQUIRED

           op_status             CDATA #REQUIRED

           rc_code               CDATA #REQUIRED

           call_id               CDATA #REQUIRED

           crm_feature_set       CDATA #REQUIRED

           crm-debug-origin      CDATA #IMPLIED

           migrate_from          CDATA #IMPLIED

           transition_key        CDATA #IMPLIED

           op_digest             CDATA #IMPLIED

           op_restart_digest     CDATA #IMPLIED

           op_force_restart      CDATA #IMPLIED

           last_run              CDATA #IMPLIED

           last_rc_change        CDATA #IMPLIED

           exec_time             CDATA #IMPLIED

           queue_time            CDATA #IMPLIED

           interval              CDATA #REQUIRED

           transition_magic      CDATA #REQUIRED>