hostnameutils (1) - Linux Man Pages
hostnameutils: get local host information
$SGE_ROOT/utilbin/$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
DESCRIPTIONgethostname 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.
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.
<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).
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
- Specifies the location of the xxQS_NAMExx standard configuration files.
- If set, specifies the default xxQS_NAMExx cell.
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