hostnameutils (1) - Linux Manuals

hostnameutils: get local host information

Command to display hostnameutils manual in Linux: $ man 1 hostnameutils

NAME

gethostname, gethostbyname, gethostbyaddr, getservbyname - get local host information

SYNTAX

$SGE_ROOT/utilbin/$ARCH/gethostname [-help|-name|-aname|-all]

$SGE_ROOT/utilbin/$ARCH/gethostbyname [-help|-name|-aname|-all] name

$SGE_ROOT/utilbin/$ARCH/gethostbyaddr [-help|-name|-aname|-all] ip

$SGE_ROOT/utilbin/$ARCH/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 utils are primarily used by the xxQS_NAMExx 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 xxQS_NAMExx host alias file is used for host name resolving. It is necessary to set the environment variable xxQS_NAME_Sxx_ROOT and, if more than one cell is defined, also xxQS_NAME_Sxx_CELL.

This option will print out the xxQS_NAMExx host name.

-all

By using the -all option all available host information will be printed. This information includes the host name, the xxQS_NAMExx 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:

>/opt/sge/default/lx-amd64/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 xxQS_NAMExx 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).

>/opt/sge/default/lx-amd64/gethostname -all
Hostname: extern_name.mydomain
SGE name: gridmaster
Aliases:  loghost gridmaster
Host Address(es): 192.168.143.99

ENVIRONMENT VARIABLES

xxQS_NAME_Sxx_ROOT: Specifies the location of the xxQS_NAMExx standard configuration files.
xxQS_NAME_Sxx_CELL: If set, specifies the default xxQS_NAMExx cell.

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