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gfhost - Online in the Cloud

Run gfhost in OnWorks free hosting provider over Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

This is the command gfhost that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

PROGRAM:

NAME


gfhost - Gfarm host maintenance 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] hostname

gfhost -m [-P path] [-a architecture] [-p port-number] [-n number-of-CPUs] [-A] hostname

gfhost -d [-P path] hostname...

gfhost -R [-P path]

DESCRIPTION


gfhost is used to display and maintain information about filesystem nodes. The function
that gfhost performs is determined by an option, -c, -d, -H, -l, -M, -m, -R. These
functions are mutually exclusive, and only one option among them can be specified. If none
of them is specified, host name will be displayed as the default function of gfhost.

FUNCTIONS


Metadata in the metadata server will be accessed by function -c, -d, -M, -m or -R. These
functions add/delete/display/modify/restore host information in the metadata.

If -H, -l or -M is specified, or none of the functions are specified, gfhost displays
filesystem node information. The -M function only accesses information in the metadata
server. Display functions other than -M also access gfsd, which is running on filesystem
nodes. For functions which access gfhost, the access option can be specified by options
-i, -j, -U and -v.

You don't have to specify hostnames for display functions. In that case, all hosts which
are registered in metadata will be displayed, but you can limit the type of hosts
displayed by the -a or -D option. By default, hosts are displayed in alphabetical order,
but you can change this by the -L, -p, or -r options. Although the -L option is ignored in
the -M function and in the default function. .

The following is a list of the functions of the gfhost command. You shouldn't specify more
than one functions at a time.

<none>
If you don't specify any of the functions, gfhost accesses gfsd, and displays the
names of hosts which are currently available as its default function. Hostnames are
displayed in alphabetical order, by default.

-c
Creates the metadata information for the host that is specified in the argument.
Option -a is mandatory for this function, this option specifies the architecture of
the host. Option -p is mandatory in this function too, this option specifies the port
number of gfsd on the host. Option -n may be used to specify the number of CPUs of the
host, and 1 CPU is assumed, if -n is omitted.

You can specifiy multiple hostnames in this function. In that case, the first hostname
is treated as the identifier of the host, and the host identifier is used for
replication information management.

-d
Deletes host information from metadata. Currently, even hosts which are referred by
replica catalog can be deleted. But be careful, because such deletions cause
inconsistencies of metadata.

-H
Displays load average and authentication method. With this function, the exact
hostname passed by the gfhost command arguments will be displayed instead of the
canonical host identifier. Also, this function displays the IP address used to access
gfsd in parentheses just after the hostname.

If the host cannot be accessed due to a machine down or network problem, etc.,
x.xx/x.xx/x.xx will be displayed in the load average field. If the host is up, but
gfsd on the host cannot be accessed, -.--/-.--/-.-- will be displayed.

The next field is the authentication method used with the host. `G' in this field
means GSI authentication and encryption, `g' means only authentication is performed by
GSI and actual communication is unprotected plain data (gsi_auth), `s' means gfarm
sharedsecret authentication, `x' means that the authentication failed, and `-' means
that the authentication wasn't actually tried. If the -U option is specified, this
authentication method field won't be provided.

Hostnames are displayed in alphabetical order, by default.

-l
Displays in the long format. This function displays both information retrieved from
gfsd and the metadata server. The types of information retrieved from gfsd are load
average and authentication method. And the types of information retrieved from the
metadata server are architecture name, number of CPUs and host identifier. IP address
will be displayed in parentheses just after the hostname used for the access to gfsd.

If the host cannot be accessed due to a machine down or network problem, etc.,
x.xx/x.xx/x.xx will be displayed in the load average field. If the host is up, but
gfsd on the host cannot be accessed , -.--/-.--/-.-- will be displayed.

The next field is the authentication method used with the host. `G' in this field
means GSI authentication and encryption, `g' means only authentication is performed by
GSI and actual communication is unprotected plain data (gsi_auth), `s' means gfarm
sharedsecret authentication, `x' means that the authentication failed, and `-' means
that the authentication wasn't actually tried. If that -U option is specified, this
authentication method field won't be provided.

Hostnames are displayed in alphabetical order, by default.

-M
The metadata information of the hosts will be displayed. Hostnames are displayed in
alphabetical order, by default.

-m
Modifies metadata information of the host, by specifying the host identifier. The -a
and -n options overwrite the current value of each option.

-R
Restores 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.

-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.

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