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HAST.CONF(5)              FreeBSD File Formats Manual             HAST.CONF(5)

NAME
     hast.conf - configuration file for the hastd(8) deamon and the hastctl(8)
     utility.

DESCRIPTION
     The hast.conf file is used by both hastd(8) daemon and hastctl(8) control
     utility.  Configuration file is designed in a way that exactly the same
     file can be (and should be) used on both HAST nodes.  Every line starting
     with # is treated as comment and ignored.

CONFIGURATION FILE SYNTAX
     General syntax of the hast.conf file is following:

           # Global section
           control <addr>
           listen <addr>
           replication <mode>
           timeout <seconds>

           on <node> {
                   # Node section
                   control <addr>
                   listen <addr>
           }

           on <node> {
                   # Node section
                   control <addr>
                   listen <addr>
           }

           resource <name> {
                   # Resource section
                   replication <mode>
                   name <name>
                   local <path>
                   timeout <seconds>

                   on <node> {
                           # Resource-node section
                           name <name>
                           # Required
                           local <path>
                           # Required
                           remote <addr>
                   }
                   on <node> {
                           # Resource-node section
                           name <name>
                           # Required
                           local <path>
                           # Required
                           remote <addr>
                   }
           }

     Most of the various available configuration parameters are optional.  If
     parameter is not defined in the particular section, it will be inherited
     from the parent section.  For example, if the listen parameter is not
     defined in the node section, it will be inherited from the global
     section.  In case the global section does not define the listen parameter
     at all, the default value will be used.

CONFIGURATION FILE DESCRIPTION
     The <node> argument can be replaced either by a full hostname as obtained
     by gethostname(3), only first part of the hostname, or by node's UUID as
     found in the kern.hostuuid sysctl(8) variable.

     The following statements are available:

     control <addr>

               Address for communication with hastctl(8).  Each of the
               following examples defines the same control address:

                     uds:///var/run/hastctl
                     unix:///var/run/hastctl
                     /var/run/hastctl

               The default value is uds:///var/run/hastctl.

     listen <addr>

               Address to listen on in form of:

                     protocol://protocol-specific-address

               Each of the following examples defines the same listen address:

                     0.0.0.0
                     0.0.0.0:8457
                     tcp://0.0.0.0
                     tcp://0.0.0.0:8457
                     tcp4://0.0.0.0
                     tcp4://0.0.0.0:8457

               The default value is tcp4://0.0.0.0:8457.

     replication <mode>

               Replication mode should be one of the following:

               memsync

                         Report the write operation as completed when local
                         write completes and when the remote node acknowledges
                         the data receipt, but before it actually stores the
                         data.  The data on remote node will be stored
                         directly after sending acknowledgement.  This mode is
                         intended to reduce latency, but still provides a very
                         good reliability.  The only situation where some
                         small amount of data could be lost is when the data
                         is stored on primary node and sent to the secondary.
                         Secondary node then acknowledges data receipt and
                         primary reports success to an application.  However,
                         it may happen that the seconderay goes down before
                         the received data is really stored locally.  Before
                         secondary node returns, primary node dies entirely.
                         When the secondary node comes back to life it becomes
                         the new primary.  Unfortunately some small amount of
                         data which was confirmed to be stored to the
                         application was lost.  The risk of such a situation
                         is very small, which is the reason for this mode to
                         be the default.

               fullsync

                         Mark the write operation as completed when local as
                         well as remote write completes.  This is the safest
                         and the slowest replication mode.  The fullsync
                         replication mode is currently not implemented.

               async

                         The write operation is reported as complete right
                         after the local write completes.  This is the fastest
                         and the most dangerous replication mode.  This mode
                         should be used when replicating to a distant node
                         where latency is too high for other modes.  The async
                         replication mode is currently not implemented.

     timeout <seconds>

               Connection timeout in seconds.  The default value is 5.

     name <name>

               GEOM provider name that will appear as /dev/hast/_name_.  If
               name is not defined, resource name will be used as provider
               name.

     local <path>

               Path to the local component which will be used as backend
               provider for the resource.  This can be either GEOM provider or
               regular file.

     remote <addr>

               Address of the remote hastd daemon.  Format is the same as for
               the listen statement.  When operating as a primary node this
               address will be used to connect to the secondary node.  When
               operating as a secondary node only connections from this
               address will be accepted.

EXAMPLES
     The example configuration file can look as follows:

           resource shared {
                   local /dev/da0

                   on hasta {
                           remote tcp4://10.0.0.2
                   }
                   on hastb {
                           remote tcp4://10.0.0.1
                   }
           }
           resource tank {
                   on hasta {
                           local /dev/mirror/tanka
                           remote tcp4://10.0.0.2
                   }
                   on hastb {
                           local /dev/mirror/tankb
                           remote tcp4://10.0.0.1
                   }
           }

FILES
     /etc/hast.conf        The default hast.conf configuration file.
     /var/run/hastctl      Control socket used by the hastctl(8) control
                           utility to communicate with the hastd(8) daemon.

SEE ALSO
     gethostname(3), geom(4), hastctl(8), hastd(8).

AUTHORS
     The hast.conf was written by Pawel Jakub Dawidek <pjd@FreeBSD.org> under
     sponsorship of the FreeBSD Foundation.

FreeBSD 11.0-PRERELEASE        February 1, 2010        FreeBSD 11.0-PRERELEASE

NAME | DESCRIPTION | CONFIGURATION FILE SYNTAX | CONFIGURATION FILE DESCRIPTION | EXAMPLES | FILES | SEE ALSO | AUTHORS

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