NAME¶
gfhost - Gfarm filesystem node management command
SYNOPSIS¶
gfhost [-H | -l | -M] [-iLprUv] [-P path]
[-a architecture] [-D domain-name]
[-j concurrency] [hostname...]
gfhost -c [-P path]
-a architecture -p port-number
[-n number-of-CPUs] [-f flags]
hostname
gfhost -m [-P path]
[-a architecture] [-p port-number]
[-n number-of-CPUs] [-f flags]
hostname
gfhost -d [-P path] hostname...
gfhost -R [-P path]
DESCRIPTION¶
gfhost displays the information of filesystem nodes. It
also registers a new filesystem node, and modifies and deletes the
registered information.
The function of gfhost is determined by the option, -c, -m,
-d, -H, -l, -M, and -R. These functions are mutually exclusive, and only one
option among them can be specified. If none of them is specified, filesystem
nodes will be listed, which is the default function of gfhost.
FUNCTIONS¶
The Gfarm filesystem manages filesystem nodes at the gfmd metadata
server. The -c option registers a new filesystem node. The -m option
modifies the registered information. The -d option removes an entry of the
filesystem node and related file metadata. The -R option restores the dumped
information of filesystem nodes, which is obtained by the -M option. These
operations require gfarmadm privilege.
The -H, -l, -M, or no functional option is specified,
gfhost displays filesystem node information. The -M lists the
registered information of filesystem nodes at the gfmd metadata server.
Other options access gfsd filesystem daemon to obtain more
information and also to check the accessibility to a filesystem node. The
-i, -j, -U and -v options are available.
When hostnames of filesystem nodes are not specified, all
registered hosts will be displayed, but you can limit the type of hosts
displayed by the -a and/or -D option. By default, hosts are displayed in
alphabetical order, but you can change this by the -L, -p, or -r option,
although the -L option is effective with -H or -l option.
The following is a list of the functions of the gfhost
command. You shouldn't specify more than one function at a time.
<none>
When no function is specified, gfhost accesses to
gfsd, and displays the host names which are currently available. They
are displayed in alphabetical order, by default.
-c
Creates a host entry of a filesystem node that is
specified by the argument. The -a option is mandatory, which specifies the
architecture of the filesystem node. The -p option is mandatory, which
specifies the port number of gfsd on the filesystem node. The -n option
is optional, which specifies the number of CPUs of the filesystem node. When
it is omitted, 1 CPU is assumed. The -f option is optional, which specifies
the flag of the file system node. When it is omitted, 0 is assumed.
-d
Deletes a host entry. All file metadata is also
asynchronously updated to delete invalid replica entries for the removed
filesystem node, and to create file replicas if required, automatically.
-l
Displays in a long format, which consists of the CPU load
average, authentication method, architecture, the number of CPUs, hostname,
port number, flags, and the IP address.
If the host cannot be accessed due to a machine down or a network
problem, etc., x.xx/x.xx/x.xx will be displayed in the CPU load average
field. If the host is up, but gfsd on the host cannot be accessed,
-.--/-.--/-.-- will be displayed.
In the field of the authentication method, `G' means the GSI
authentication and the encryption, `g' means only authentication is
performed by GSI and actual communication is unprotected plain data
(gsi_auth), `s' means the gfarm sharedsecret authentication, `x' means that
the authentication fails, and `-' means that the authentication wasn't
actually tried. With the -U option, there is no authentication method
field.
In the field of the flags, refer to the -f option.
Hostnames are displayed in alphabetical order, by default.
-H
Displays filesystem nodes with the CPU load average and
the authentication method. This function also displays the IP address used to
access to
gfsd in parentheses just after the hostname.
For the field of the CPU load average and the authentication
method, refer to the -l option.
Hostnames are displayed in alphabetical order, by default.
-M
Dumps the metadata information of the registered
filesystem nodes. Hostnames are displayed in alphabetical order, by
default.
-m
Modifies the registered metadata information of the
filesystem node. The -a, -p, -n, and/or -f option modify the current value of
each option.
-R
Restores the metadata information read from standard
input. The format of the metadata is same as the format that the -M function
displays.
-?
Prints usage.
OPTIONS¶
-a architecture
This option specifies the CPU architecture using a format
like sparc-sun-solaris8 or i386-redhat8.0-linux, etc. If this option is used
with the -c or -m function, this means the architecture used to add/modify the
metadata information. If this option is used with -H, -l, -M function or
default function, this limits hosts to the specified architecture.
-D domain-name
This option is used with the -H, -l, -M function or the
default function to limit hosts to the specified domain.
-i
There is an "address_use" directive in
%%SYSCONFDIR%%/gfarm2.conf and $HOME/.gfarm2rc to give priorities of network
addresses for gfarm access. This directive works with the gfhost
command, but will be ignored, if you specified the -i option with
gfhost.
-j concurrency
This option specifies the concurrency used for access to
gfsd. The default value is 10.
-L
Sorts by load average order. This option is effective
only with the -H and -l functions .
-n number-of-CPUs
This option is used with the -c or -m function, and
specifies the number of CPUs of the host.
-p port-number
This option is used with -c or -m function, and specifies
the port number of gfsd on the host.
-f flags
This option is used with -c or -m function, and specifies
the flags of
gfsd on the host. Values of flags are constructed by a
bitwise-or of the following list.
1
readonly
-P path
This option specifies a pathname or a Gfarm URL to
identify a metadata server which will be accessed by this command. If not
specified, "/" is used as the default value.
-r
Reverses the order of sort.
-u
Plain order. This option stops sorting on the -H, -l, -M
function or the default function. With the -M function, command argument order
(if any), or the order that the metadata server answers is used for display.
With the -H, -l function or the default function, the result is displayed in
the order that each gfsd answers.
-U
Suppresses authentication attempts by TCP, and only
queries load average by UDP. This option only makes sense if you specified the
-H or -l function, or if you didn't specify any function. This option makes
the gfhost command run faster. If the -H or -l function is specified, this
option makes the authentication method field disappear.
-v
The -H, -l function and the default function don't
produce error reports on gfsd accesses; these error reports will be
produced by this option.
SEE ALSO¶
gfarm2.conf(5), gfsd(8)
