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.\" Copyright (c) 2010 The FreeBSD Foundation
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.\" Copyright (c) 2010-2012 Pawel Jakub Dawidek <pawel@dawidek.net>
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.\" All rights reserved.
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.\"
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.\" This documentation was written by Pawel Jakub Dawidek under sponsorship from
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.\" the FreeBSD Foundation.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd January 25, 2012
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.Dt HAST.CONF 5
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.Os
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.Sh NAME
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.Nm hast.conf
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.Nd configuration file for the
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.Xr hastd 8
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daemon and the
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.Xr hastctl 8
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utility
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.Sh DESCRIPTION
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The
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.Nm
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file is used by both
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.Xr hastd 8
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daemon
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and
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.Xr hastctl 8
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control utility.
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Configuration file is designed in a way that exactly the same file can be
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(and should be) used on both HAST nodes.
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Every line starting with # is treated as comment and ignored.
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.Sh CONFIGURATION FILE SYNTAX
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General syntax of the
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.Nm
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file is following:
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.Bd -literal -offset indent
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# Global section
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control <addr>
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listen <addr>
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replication <mode>
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checksum <algorithm>
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compression <algorithm>
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timeout <seconds>
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exec <path>
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metaflush on | off
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pidfile <path>
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on <node> {
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# Node section
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control <addr>
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listen <addr>
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pidfile <path>
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}
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on <node> {
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# Node section
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control <addr>
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listen <addr>
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pidfile <path>
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}
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resource <name> {
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# Resource section
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replication <mode>
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checksum <algorithm>
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compression <algorithm>
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name <name>
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local <path>
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timeout <seconds>
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exec <path>
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metaflush on | off
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on <node> {
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# Resource-node section
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name <name>
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# Required
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local <path>
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metaflush on | off
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# Required
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remote <addr>
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source <addr>
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}
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on <node> {
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# Resource-node section
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name <name>
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# Required
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local <path>
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metaflush on | off
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# Required
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remote <addr>
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source <addr>
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}
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}
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.Ed
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.Pp
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Most of the various available configuration parameters are optional.
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If parameter is not defined in the particular section, it will be
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inherited from the parent section.
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For example, if the
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.Ic listen
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parameter is not defined in the node section, it will be inherited from
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the global section.
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In case the global section does not define the
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.Ic listen
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parameter at all, the default value will be used.
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.Sh CONFIGURATION FILE DESCRIPTION
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The
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.Aq node
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argument can be replaced either by a full hostname as obtained by
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.Xr gethostname 3 ,
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only first part of the hostname, by node's UUID as found in the
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.Va kern.hostuuid
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.Xr sysctl 8
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variable
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or by node's hostid as found in the
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.Va kern.hostid
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.Xr sysctl 8
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variable.
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.Pp
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The following statements are available:
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.Bl -tag -width ".Ic xxxx"
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.It Ic control Aq addr
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.Pp
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Address for communication with
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.Xr hastctl 8 .
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Each of the following examples defines the same control address:
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.Bd -literal -offset indent
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uds:///var/run/hastctl
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unix:///var/run/hastctl
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/var/run/hastctl
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.Ed
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.Pp
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The default value is
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.Pa uds:///var/run/hastctl .
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.It Ic pidfile Aq path
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.Pp
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File in which to store the process ID of the main
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.Xr hastd 8
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process.
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.Pp
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The default value is
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.Pa /var/run/hastd.pid .
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.It Ic listen Aq addr
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.Pp
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Address to listen on in form of:
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.Bd -literal -offset indent
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protocol://protocol-specific-address
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.Ed
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.Pp
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Each of the following examples defines the same listen address:
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.Bd -literal -offset indent
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0.0.0.0
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0.0.0.0:8457
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tcp://0.0.0.0
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tcp://0.0.0.0:8457
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tcp4://0.0.0.0
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tcp4://0.0.0.0:8457
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.Ed
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.Pp
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Multiple listen addresses can be specified.
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By default
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.Nm hastd
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listens on
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.Pa tcp4://0.0.0.0:8457
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and
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.Pa tcp6://[::]:8457
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if kernel supports IPv4 and IPv6 respectively.
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.It Ic replication Aq mode
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.Pp
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Replication mode should be one of the following:
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.Bl -tag -width ".Ic xxxx"
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.It Ic memsync
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.Pp
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Report the write operation as completed when local write completes and
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when the remote node acknowledges the data receipt, but before it
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actually stores the data.
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The data on remote node will be stored directly after sending
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acknowledgement.
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This mode is intended to reduce latency, but still provides a very good
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reliability.
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The only situation where some small amount of data could be lost is when
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the data is stored on primary node and sent to the secondary.
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Secondary node then acknowledges data receipt and primary reports
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success to an application.
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However, it may happen that the secondary goes down before the received
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data is really stored locally.
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Before secondary node returns, primary node dies entirely.
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When the secondary node comes back to life it becomes the new primary.
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Unfortunately some small amount of data which was confirmed to be stored
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to the application was lost.
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The risk of such a situation is very small.
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The
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.Ic memsync
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replication mode is the default.
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.It Ic fullsync
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.Pp
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Mark the write operation as completed when local as well as remote
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write completes.
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This is the safest and the slowest replication mode.
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.It Ic async
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.Pp
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The write operation is reported as complete right after the local write
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completes.
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This is the fastest and the most dangerous replication mode.
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This mode should be used when replicating to a distant node where
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latency is too high for other modes.
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.El
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.It Ic checksum Aq algorithm
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.Pp
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Checksum algorithm should be one of the following:
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.Bl -tag -width ".Ic sha256"
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.It Ic none
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No checksum will be calculated for the data being send over the network.
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This is the default setting.
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.It Ic crc32
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CRC32 checksum will be calculated.
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.It Ic sha256
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SHA256 checksum will be calculated.
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.El
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.It Ic compression Aq algorithm
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.Pp
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Compression algorithm should be one of the following:
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.Bl -tag -width ".Ic none"
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.It Ic none
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Data send over the network will not be compressed.
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.It Ic hole
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Only blocks that contain all zeros will be compressed.
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This is very useful for initial synchronization where potentially many blocks
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are still all zeros.
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There should be no measurable performance overhead when this algorithm is being
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used.
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This is the default setting.
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.It Ic lzf
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The LZF algorithm by Marc Alexander Lehmann will be used to compress the data
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send over the network.
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LZF is very fast, general purpose compression algorithm.
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.El
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.It Ic timeout Aq seconds
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.Pp
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Connection timeout in seconds.
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The default value is
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.Va 20 .
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.It Ic exec Aq path
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.Pp
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Execute the given program on various HAST events.
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Below is the list of currently implemented events and arguments the given
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program is executed with:
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.Bl -tag -width ".Ic xxxx"
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.It Ic "<path> role <resource> <oldrole> <newrole>"
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.Pp
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Executed on both primary and secondary nodes when resource role is changed.
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.It Ic "<path> connect <resource>"
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.Pp
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Executed on both primary and secondary nodes when connection for the given
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resource between the nodes is established.
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.It Ic "<path> disconnect <resource>"
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.Pp
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Executed on both primary and secondary nodes when connection for the given
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resource between the nodes is lost.
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.It Ic "<path> syncstart <resource>"
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.Pp
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Executed on primary node when synchronization process of secondary node is
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started.
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.It Ic "<path> syncdone <resource>"
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.Pp
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Executed on primary node when synchronization process of secondary node is
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completed successfully.
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.It Ic "<path> syncintr <resource>"
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.Pp
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Executed on primary node when synchronization process of secondary node is
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interrupted, most likely due to secondary node outage or connection failure
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between the nodes.
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.It Ic "<path> split-brain <resource>"
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.Pp
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Executed on both primary and secondary nodes when split-brain condition is
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detected.
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.El
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.Pp
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The
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.Aq path
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argument should contain full path to executable program.
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If the given program exits with code different than
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.Va 0 ,
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.Nm hastd
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will log it as an error.
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.Pp
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The
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.Aq resource
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argument is resource name from the configuration file.
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.Pp
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The
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.Aq oldrole
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argument is previous resource role (before the change).
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It can be one of:
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.Ar init ,
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.Ar secondary ,
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.Ar primary .
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.Pp
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The
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.Aq newrole
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argument is current resource role (after the change).
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It can be one of:
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.Ar init ,
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.Ar secondary ,
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.Ar primary .
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.It Ic metaflush on | off
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.Pp
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When set to
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.Va on ,
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flush write cache of the local provider after every metadata (activemap) update.
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Flushing write cache ensures that provider will not reorder writes and that
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metadata will be properly updated before real data is stored.
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If the local provider does not support flushing write cache (it returns
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.Er EOPNOTSUPP
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on the
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.Cm BIO_FLUSH
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request),
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.Nm hastd
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will disable
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.Ic metaflush
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automatically.
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The default value is
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.Va on .
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.It Ic name Aq name
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.Pp
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GEOM provider name that will appear as
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.Pa /dev/hast/<name> .
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If name is not defined, resource name will be used as provider name.
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.It Ic local Aq path
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.Pp
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Path to the local component which will be used as backend provider for
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the resource.
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This can be either GEOM provider or regular file.
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.It Ic remote Aq addr
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.Pp
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Address of the remote
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.Nm hastd
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daemon.
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Format is the same as for the
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.Ic listen
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statement.
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When operating as a primary node this address will be used to connect to
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the secondary node.
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When operating as a secondary node only connections from this address
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will be accepted.
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.Pp
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A special value of
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.Va none
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can be used when the remote address is not yet known (eg. the other node is not
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set up yet).
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.It Ic source Aq addr
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.Pp
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Local address to bind to before connecting to the remote
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.Nm hastd
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daemon.
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Format is the same as for the
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.Ic listen
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statement.
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.El
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.Sh FILES
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.Bl -tag -width ".Pa /var/run/hastctl" -compact
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.It Pa /etc/hast.conf
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The default
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.Xr hastctl 8
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and
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.Xr hastd 8
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configuration file.
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.It Pa /var/run/hastctl
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Control socket used by the
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.Xr hastctl 8
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control utility to communicate with the
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.Xr hastd 8
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daemon.
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.El
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.Sh EXAMPLES
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The example configuration file can look as follows:
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.Bd -literal -offset indent
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listen tcp://0.0.0.0
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on hasta {
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listen tcp://2001:db8::1/64
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}
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on hastb {
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listen tcp://2001:db8::2/64
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}
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resource shared {
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local /dev/da0
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on hasta {
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remote tcp://10.0.0.2
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}
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on hastb {
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remote tcp://10.0.0.1
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}
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}
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resource tank {
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on hasta {
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local /dev/mirror/tanka
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source tcp://10.0.0.1
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remote tcp://10.0.0.2
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}
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on hastb {
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local /dev/mirror/tankb
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source tcp://10.0.0.2
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remote tcp://10.0.0.1
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}
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}
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.Ed
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.Sh SEE ALSO
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.Xr gethostname 3 ,
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.Xr geom 4 ,
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.Xr hastctl 8 ,
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.Xr hastd 8
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.Sh AUTHORS
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The
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.Nm
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|
was written by
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.An Pawel Jakub Dawidek Aq Mt pjd@FreeBSD.org
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under sponsorship of the FreeBSD Foundation.
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