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SGE hostgroups

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Introduction

Each host group entry file defines one group. Groups can also be referenced inside groups (which is impossible in Unix /etc/group file). These groups are called subgroups.

A list of currently configured host group entries can be displayed via the qconf(1) with -shgrpl option. The contents of each enlisted host group entry can be shown via the -shgrp switch. The output follows the hostgroup format description.

New host group entries can be created and existing can be modified via the -ahgrp, -mhgrp, -dhgrp and -?attr options to qconf(1).

Note, Sun Grid Engine allows backslashes (\) be used to escape newline (\newline) characters. The backslash and the newline are replaced with a space (" ") character before any interpretation.

A host group entry contains following parameters:

group_name
The group_name defines the host group name. Host group names have to begin with an '@' character as explained for hostgroup_name in sge_types(5).
hostlist
The name of all hosts and host groups (see host_identifier in sge_types(1)) which are member of the group. As list separators white-spaces are supported only. Default value for this parameter is NONE.

Note: if the first character of the host_identifier is an "@" sign, then the name is used as a reference to a hostgroup(5) which is interpreted to be a sub group of this group.

Example

Host groups enable you to use a single name to refer to multiple hosts. A host group can include other host groups as well as multiple individual hosts. Host groups that are members of another host group are subgroups of that host group. For example, you might define a host group called @bigMachines that includes the following members:

@linux64 
@linux32 
blade1 
blade2

The initial @ sign indicates that the name is a host group. The host group @bigMachines includes all hosts that are members of the two subgroups @linux64 and @linux32. The group @bigMachines also includes two individual hosts, blade1 and blade2.

To show the host group list

qconf -shgrpl  
The option -shgrpl (show host group list) displays a list of all host groups. To add a host group to the list of host groups, type the following command:
qconf -ahgrp <hostgroupname> 
The ahgrp option (add host group) adds a new host group to the list of host groups. See the 
hostgroup(5) man page for a detailed 
description of the configuration format. 

To show a host group configuration

qconf -shgrp <hostgroupname>

The option -shgrp (show host group) shows the configuration of the specified host group. To show the host group as a tree, type the following command:

qconf -shgrp_tree <hostgroupname>

The option  -shgrp_tree (show host group as a tree) shows the configuration of the specified host group and its sub-hostgroups as a tree.

To show a host group with a resolved host list

qconf -shgrp_resolved <hostgroupname> 
The -shgrp_resolved option (show host group with resolved host list) shows the configuration of the 
specified host group with a 
resolved host list. 

To add a host group from a file

qconf -Ahgrp <filename> 
The option -Ahgrp (add host group from a file) displays an editor that contains a host group configuration defined in filename. The editor is either the default vi editor or the editor that corresponds to the $EDITOR environment variable. To configure the host group, change and save the configuration file template.

To modify a host group

qconf -mhgrp <hostgroupname>  
The option -mhgrp (modify host group) displays an editor that contains the configuration of the specified host group as template. You can modify the groupname, add a host to the hostlist, add a host group as a subgroup, and remove a host or host group. The editor is either the default vi editor or the editor that corresponds to the EDITOR environment variable. To modify the host group configuration, change and save the configuration file template.

To modify a host group from a file, type the following command:

qconf -Mhgrp <filename> 
The option -Mhgrp  (modify host group from a file) uses the content of filename as host group configuration template. The configuration in the specified file must refer to an existing host group. You can modify the groupname, add a host to the hostlist, add a host group as a subgroup, and remove a host or host group. The configuration of this host group is replaced by the file content.

To delete a host group

qconf -dhgrp <hostgroupname>
The option -dhgrp (delete host group) deletes the specified host group from the list of host groups. All entries in the host group configuration are lost.

For more information on how to configure host groups from file or modify many objects at a time, see  or the qconf

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Hostbased authentication for passphraseless SSH communication

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