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groups.conf

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groups.conf: Configuration file for ClusterShell external node groups

NAME
groups.conf - Configuration file for ClusterShell external node groups
DESCRIPTION
The ClusterShell library obtains node groups configuration options from the system-wide configuration file /etc/clustershell/groups.conf. The configuration file has a format in the style of RFC 822 composed of several sections which may be present in any order. Sections are: Main General options definition Group_source External commands definition for group source Group_source (map, all, list and reverse) [Main] Configuration parameters of the Main section are described below. default Specify the default group source used by the NodeSet parser when the user does not specify explicitly the group source (eg. "@io"). Group_source Configuration parameters of each group source section are described below. map Specify the external shell command used to resolve a group name into a nodeset, list of nodes or list of nodeset (separated by space characters or by carriage returns). The variable $GROUP is replaced before executing the command. all Optional external shell command that should return a nodeset, list of nodes or list of nodeset of all nodes for this group source. If not specified, the library will try to resolve all nodes by using the list external command in the same group source followed by map for each group. list Optional external shell command that should return the list of all groups for this group source (separated by space characters or by carriage returns). reverse Optional external shell command used to find the group(s) of a single node. The variable $NODE is previously replaced. If this upcall is not specified, the reverse operation is computed in memory by the library from the list and map external calls. Also, if the number of nodes to reverse is greater than the number of available groups, the reverse external command is avoided automatically. Each external command might return a non-zero return code when the operation is not doable. But if the call return zero, for instance, for a non-existing group, the user will not receive any error when trying to resolve such unknown group. The desired behaviour is up to the system administrator.

RESOURCE USAGE

All external command results are cached in memory to avoid multiple calls.

EXAMPLES

Simple configuration file for local groups and slurm partitions binding. groups.conf [Main] default: local [local] map: awk -F: '/^$GROUP:/ {print $2}' /etc/clustershell/groups list: awk -F: '/^w/ {print $1}' /etc/clustershell/groups [slurm] map: sinfo -h -o "%N" -p $GROUP all: sinfo -h -o "%N" list: sinfo -h -o "%P" reverse: sinfo -h -N -o "%P" -n $NODE

FILES

/etc/clustershell/groups.conf System-wide external node groups configuration file.

SEE ALSO

clush(1), clubak(1), nodeset(1) //clustershell.sourceforge.net/
AUTHOR
Stephane Thiell, CEA DAM <stephane.thiell@cea.fr>
COPYRIGHT
CeCILL-C V1 GROUPS.CONF(5)
 
 
 

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