HOSTNAMEUTILS(1)

NAME

gethostname   -
    get local hostname.

gethostbyname -
    get local host information for specified hostname.

gethostbyaddr -
    get hostname via IP address.

getservbyname -
    get configured port number of service

SYNTAX
gethostname [-help|-name|-aname|-all]

gethostbyname [-help|-name|-aname|-all] <name>

gethostbyaddr [-help|-name|-aname|-all] <ip>

getservbyname [-help|-number] <service>

DESCRIPTION
gethostname and gethostbyname are used to get the local resolved host name. gethostbyaddr is used to get the hostname of a specified IP address (dotted decimal notation). getservbyname can be used to get the configured port number of a service (e.g. from /etc/services).

The hostname utilities are primarily used by the Grid Engine installation scripts. gethostname , gethostbyname and gethostbyaddr called without any option will print out the hostname, all specified aliases, and the IP address of the locally resolved hostname. Calling getservbyname without any option will print out the full service entry.

OPTIONS

  -help

Prints a list of all options.

  -name

This option only reports the primary name of the host.

  -aname

If this option is set, the Grid Engine host alias file is used for host name resolving. It is necessary to set the environment variable SGE_ROOT and, if more than one cell is defined, also SGE_CELL.

This option will print out the Grid Engine host name.

  -all

By using the -all option all available host information will be printed. This information includes the host name, the Grid Engine host name, all host aliases, and the IP address of the host.

  -number

This option will print out the port number of the specified service name.

  <name>

The host name for which the information is requested.

  <ip>
The IP address (dotted decimal notation) for which the information is requested.

  <service>
The service name for which the information is requested (e.g. ftp, sge_qmaster or sge_execd).

EXAMPLES

The following example shows how to get the port number of the FTP service:

    >getservbyname -number ftp
    21

The next example shows the output of gethostname -all when the host alias file contains this line:

gridmaster extern_name extern_name.mydomain

The local host resolving must also provide the alias name "gridmaster". Each Grid Engine host that wants to use the cluster must be able to resolve the host name "gridmaster".

To setup an alias name, edit your /etc/hosts file or modify your NIS setup to provide the alias for the NIS clients.

The host alias file must be readable from each host (use e.g. NFS shared file location).

    >gethostname -all
    Hostname: extern_name.mydomain
    SGE name: gridmaster
    Aliases:  loghost gridmaster
    Host Address(es): 192.168.143.99

ENVIRONMENTAL VARIABLES

SGE_ROOT
    Specifies the location of the Grid Engine standard configuration files.

SGE_CELL
    If set, specifies the default Grid Engine cell.

SEE ALSO

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