282 lines
7.1 KiB
Groff
282 lines
7.1 KiB
Groff
.\" Copyright (c) 2010 The FreeBSD Foundation
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" This software was developed by Pawel Jakub Dawidek under sponsorship from
|
|
.\" the FreeBSD Foundation.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd August 5, 2010
|
|
.Dt HAST.CONF 5
|
|
.Os
|
|
.Sh NAME
|
|
.Nm hast.conf
|
|
.Nd configuration file for the
|
|
.Xr hastd 8
|
|
deamon and the
|
|
.Xr hastctl 8
|
|
utility.
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
file is used by both
|
|
.Xr hastd 8
|
|
daemon
|
|
and
|
|
.Xr 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.
|
|
.Sh CONFIGURATION FILE SYNTAX
|
|
General syntax of the
|
|
.Nm
|
|
file is following:
|
|
.Bd -literal -offset indent
|
|
# 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>
|
|
}
|
|
}
|
|
.Ed
|
|
.Pp
|
|
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
|
|
.Ic 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
|
|
.Ic listen
|
|
parameter at all, the default value will be used.
|
|
.Sh CONFIGURATION FILE DESCRIPTION
|
|
The
|
|
.Aq node
|
|
argument can be replaced either by a full hostname as obtained by
|
|
.Xr gethostname 3 ,
|
|
only first part of the hostname, or by node's UUID as found in the
|
|
.Va kern.hostuuid
|
|
.Xr sysctl 8
|
|
variable.
|
|
.Pp
|
|
The following statements are available:
|
|
.Bl -tag -width ".Ic xxxx"
|
|
.It Ic control Aq addr
|
|
.Pp
|
|
Address for communication with
|
|
.Xr hastctl 8 .
|
|
Each of the following examples defines the same control address:
|
|
.Bd -literal -offset indent
|
|
uds:///var/run/hastctl
|
|
unix:///var/run/hastctl
|
|
/var/run/hastctl
|
|
.Ed
|
|
.Pp
|
|
The default value is
|
|
.Pa uds:///var/run/hastctl .
|
|
.It Ic listen Aq addr
|
|
.Pp
|
|
Address to listen on in form of:
|
|
.Bd -literal -offset indent
|
|
protocol://protocol-specific-address
|
|
.Ed
|
|
.Pp
|
|
Each of the following examples defines the same listen address:
|
|
.Bd -literal -offset indent
|
|
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
|
|
.Ed
|
|
.Pp
|
|
The default value is
|
|
.Pa tcp4://0.0.0.0:8457 .
|
|
.It Ic replication Aq mode
|
|
.Pp
|
|
Replication mode should be one of the following:
|
|
.Bl -tag -width ".Ic xxxx"
|
|
.It Ic memsync
|
|
.Pp
|
|
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 secondary 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.
|
|
The
|
|
.Ic memsync
|
|
replication mode is currently not implemented.
|
|
.It Ic fullsync
|
|
.Pp
|
|
Mark the write operation as completed when local as well as remote
|
|
write completes.
|
|
This is the safest and the slowest replication mode.
|
|
The
|
|
.Ic fullsync
|
|
replication mode is the default.
|
|
.It Ic async
|
|
.Pp
|
|
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
|
|
.Ic async
|
|
replication mode is currently not implemented.
|
|
.El
|
|
.It Ic timeout Aq seconds
|
|
.Pp
|
|
Connection timeout in seconds.
|
|
The default value is
|
|
.Va 5 .
|
|
.It Ic name Aq name
|
|
.Pp
|
|
GEOM provider name that will appear as
|
|
.Pa /dev/hast/<name> .
|
|
If name is not defined, resource name will be used as provider name.
|
|
.It Ic local Aq path
|
|
.Pp
|
|
Path to the local component which will be used as backend provider for
|
|
the resource.
|
|
This can be either GEOM provider or regular file.
|
|
.It Ic remote Aq addr
|
|
.Pp
|
|
Address of the remote
|
|
.Nm hastd
|
|
daemon.
|
|
Format is the same as for the
|
|
.Ic 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.
|
|
.Pp
|
|
A special value of
|
|
.Va none
|
|
can be used when the remote address is not yet known (eg. the other node is not
|
|
set up yet).
|
|
.El
|
|
.Sh FILES
|
|
.Bl -tag -width ".Pa /var/run/hastctl" -compact
|
|
.It Pa /etc/hast.conf
|
|
The default
|
|
.Nm
|
|
configuration file.
|
|
.It Pa /var/run/hastctl
|
|
Control socket used by the
|
|
.Xr hastctl 8
|
|
control utility to communicate with the
|
|
.Xr hastd 8
|
|
daemon.
|
|
.El
|
|
.Sh EXAMPLES
|
|
The example configuration file can look as follows:
|
|
.Bd -literal -offset indent
|
|
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
|
|
}
|
|
}
|
|
.Ed
|
|
.Sh SEE ALSO
|
|
.Xr gethostname 3 ,
|
|
.Xr geom 4 ,
|
|
.Xr hastctl 8 ,
|
|
.Xr hastd 8 .
|
|
.Sh AUTHORS
|
|
The
|
|
.Nm
|
|
was written by
|
|
.An Pawel Jakub Dawidek Aq pjd@FreeBSD.org
|
|
under sponsorship of the FreeBSD Foundation.
|