nodeset (1)

nodeset [COMMAND] [OPTIONS] [nodeset1 [-ixX] nodeset2|...]

nodeset is an utility command provided with the ClusterShell library which implements some features of ClusterShell's NodeSet and RangeSet Python classes. It provides easy manipulation of indexed cluster nodes and node groups. It is automatically bound to the library node group resolution mechanism. Thus, nodeset is especially useful to enhance cluster aware administration shell scripts.

--version

show program's version number and exit

-h, --help

show this help message and exit

-sGROUPSOURCE,--groupsource=GROUPSOURCE

optional groups.conf(5) group source to use

Commands:

-c, --count

show number of nodes in nodeset(s)

-e, --expand

expand nodeset(s) to separate nodes (see also -S SEPARATOR)

-f, --fold

fold nodeset(s) (or separate nodes) into one nodeset

-l, --list

list node groups, list node groups and nodes (-ll) or list node groups, nodes and node count (-lll). When no argument is specified at all, this command will list all node group names found in selected group source (see also -s GROUPSOURCE). If any nodesets are specified as argument, this command will find node groups these nodes belongs to (individually). Optionally for each group, the fraction of these nodes being member of the group may be displayed (with -ll), and also member count/total group node count (with -lll). If a single hyphen-minus (-) is given as a nodeset, it will be read from standard input.

-r, --regroup

fold nodes using node groups (see -s GROUPSOURCE)

--groupsources

list all configured group sources (see groups.conf(5))

Operations:

-xSUB_NODES,--exclude=SUB_NODES

exclude specified nodeset

-iAND_NODES,--intersection=AND_NODES

calculate nodesets intersection

-XXOR_NODES,--xor=XOR_NODES

calculate symmetric difference between nodesets

Options:

-a, --all

call external node groups support to display all nodes

--autostep=AUTOSTEP

auto step threshold number when folding nodesets, if not specified, auto step is disabled. Example: autostep=4, "node2 node4 node6" folds in node[2,4,6] but autostep=3, "node2 node4 node6" folds in node[2-6/2]

-d, --debug

output more messages for debugging purpose

-q, --quiet

be quiet, print essential output only

-R, --rangeset

switch to RangeSet instead of NodeSet. Useful when working on numerical cluster ranges, eg. 1,5,18-31

-G, --groupbase

hide group source prefix (always @groupname)

-SSEPARATOR,--separator=SEPARATOR

separator string to use when expanding nodesets (default: ' ')

-ISLICE_RANGESET,--slice=SLICE_RANGESET

return sliced off result; examples of SLICE_RANGESET are "0" for simple index selection, or "1-9/2,16" for complex rangeset selection

--split=MAXSPLIT

split result into a number of subsets

--contiguous

split result into contiguous subsets (ie. for nodeset, subsets will contain nodes with same pattern name and a contiguous range of indexes, like foobar[1-100]; for rangeset, subsets with consists in contiguous index ranges)"""

For a short explanation of these options, see -h, --help.

If a single hyphen-minus (-) is given as a nodeset, it will be read from standard input.

The nodeset command benefits from ClusterShell NodeSet basic arithmetic addition. This feature extends recognized string patterns by supporting operators matching all Operations seen previously. String patterns are read from left to right, by proceeding any character operators accordinately.

Supported character operators

,

indicates that the union of both left and right nodeset should be computed before continuing

!

indicates the difference operation

&

indicates the intersection operation

^

indicates the symmetric difference (XOR) operation

Care should be taken to escape these characters as needed when the shell does not interpret them literally.

Examples of use of extended patterns

$ nodeset -f node[0-7],node[8-10]

node[0-10]

$ nodeset -f node[0-10]!node[8-10]

node[0-7]

$ nodeset -f node[0-10]&node[5-13]

node[5-10]

$ nodeset -f node[0-10]^node[5-13]

node[0-4,11-13]

Example of advanced usage

$ nodeset -f @gpu^@slurm:bigmem!@chassis[1-9/2]

This computes a folded nodeset containing nodes found in group @gpu and @slurm:bigmem, but not in both, minus the nodes found in odd chassis groups from 1 to 9.

An exit status of zero indicates success of the nodeset command. A non-zero exit status indicates failure.

Getting the node count

$ nodeset -c node[0-7,32-159]

136

$ nodeset -c node[0-7,32-159] node[160-163]

140

$ nodeset -c @login

4

Folding nodesets

$ nodeset -f node[0-7,32-159] node[160-163]

node[0-7,32-163]

$ echo node3 node6 node1 node2 node7 node5 | nodeset -f

node[1-3,5-7]

Expanding nodesets

$ nodeset -e node[160-163]

node160 node161 node162 node163

Excluding nodes from nodeset

$ nodeset -f node[32-159] -x node33

node[32,34-159]

Computing nodesets intersection

$ nodeset -f node[32-159] -i node[0-7,20-21,32,156-159]

node[32,156-159]

Computing nodesets symmetric difference (xor)

$ nodeset -f node[33-159] --xor node[32-33,156-159]

node[32,34-155]

Splitting nodes into several nodesets (expanding results)

$ nodeset -e --split=3 node[1-9]

node1 node2 node3
node4 node5 node6
node7 node8 node9

Splitting non-contiguous nodesets (folding results)

$ nodeset -f --contiguous node2 node3 node4 node8 node9

node[2-4]
node[8-9]

Command syntax has been changed since nodeset command available with ClusterShell v1.1. Operations, like --intersection or -x, are now specified between nodesets in the command line.

ClusterShell v1.1:

$ nodeset -f -x node[3,5-6,9] node[1-9]

node[1-2,4,7-8]

ClusterShell v1.2+:

$ nodeset -f node[1-9] -x node[3,5-6,9]

node[1-2,4,7-8]

clush(1), clubak(1), groups.conf(5).

Use the following URL to submit a bug report or feedback:

https://github.com/cea-hpc/clustershell/issues

Stephane Thiell, CEA DAM <[email protected]>

CeCILL-C V1