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ctdb-docs: Update documentation of ipreallocated event
This was out of date due to the removal of service_check_reconfigure() and similar. Signed-off-by: Martin Schwenke <martin@meltin.net> Reviewed-by: Amitay Isaacs <amitay@gmail.com> Autobuild-User(master): Amitay Isaacs <amitay@samba.org> Autobuild-Date(master): Thu Jul 13 17:57:11 CEST 2017 on sn-devel-144
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@ -159,33 +159,32 @@ updateip <old-interface> <new-interface> <ip-address> <netmask-bits>
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ipreallocated
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This event is triggered after "releaseip", "takeip" and
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"updateip" events during public IP address (re)assignment.
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This event is triggered on all nodes as the last step of
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public IP address (re)assignment. It is unconditionally
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triggered after any "releaseip", "takeip" and "updateip"
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events, even though these events may not run on some nodes if
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there are no relevant changes. That is, the "ipreallocated"
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event is triggered unconditionally, even on nodes where public
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IP addresses assignements have not changed.
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This event is used to reconfigure services.
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This event runs even if public IP addresses on a node have not
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been changed. This allows reconfiguration to depend on the
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states of other nodes rather that just IP addresses.
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Since "ipreallocated" is always run, this allows
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reconfiguration to depend on the states of other nodes rather
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that just IP addresses.
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Example: 11.natgw recalculates the NAT gateway master and
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updates the relevant network configuration on each node if the
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NAT gateway master has changed.
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Additional notes for "takeip", "releaseip", "updateip",
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ipreallocated":
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"ipreallocated":
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* Failure of any of these events causes IP allocation to be retried.
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* The "ipreallocated" event is run on all nodes. It is even run if no
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"takeip", "releaseip" or "updateip" events were triggered.
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* An event script can use ctdb_service_set_reconfigure() in "takeip"
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or "releaseip" events to flag that its service needs to be
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reconfigured. The event script can then define a
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service_reconfigure() function, which will be implicitly run before
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the "ipreallocated" event. This is a useful way of performing
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reconfiguration that is conditional upon public IP address changes.
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This means an explicit "ipreallocated" event handler is usually not
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necessary.
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* An event script can use ctdb_service_set_reconfigure() in "takeip",
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"releaseip" or "updateip" events to flag that its service needs to
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be reconfigured. The "ipreallocated" event can then use
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ctdb_service_needs_reconfigure() to test if there were public IPs
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changes to determine what type of reconfiguration (if any) is
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needed.
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