nodeattrib(8) -- List or change confluent nodes attributes
=========================================================

## SYNOPSIS

`nodeattrib [-b] <noderange> [all|<nodeattribute>...]`
`nodeattrib <noderange> [<nodeattribute1=value1> <nodeattribute2=value2> ...]`  
`nodeattrib -c <noderange> <nodeattribute1> <nodeattribute2> ...`  
`nodeattrib -e <noderange> <nodeattribute1> <nodeattribute2> ...`  
`nodeattrib -p <noderange> <nodeattribute1> <nodeattribute2> ...`
`nodeattrib <noderange> -s <attributes.batch> ...` 

## DESCRIPTION

**nodeattrib** manages the attributes of confluent nodes.  In
the simplest form, it simply takes the given noderange(5) and lists the
matching nodes, one line at a time.

If a list of node attribute names are given, the value of those are also
displayed.  If `-b` is specified, it will also display information on
how inherited and expression based attributes are defined.  Attributes can be
straightforward values, or an expression as documented in nodeattribexpressions(5).
For a full list of attributes, run `nodeattrib <node> all` against a node.
If `-c` is specified, this will set the nodeattribute to a null value.
This is different from setting the value to an empty string.

Arbitrary custom attributes can also be created with the `custom.` prefix.

Attributes may be specified by wildcard, for example `net.*switch` will report
all attributes that begin with `net.` and end with `switch`.

If the word all is specified, then all available attributes are given.
Omitting any attribute name or the word 'all' will display only attributes
that are currently set.

For the `groups` attribute, it is possible to add a group by doing
`groups,=<newgroup>` and to remove by doing `groups^=<oldgroup>`

Note that `nodeattrib <group>` will likely not provide the expected behavior.
See nodegroupattrib(8) command on how to manage attributes on a group level.  Running
nodeattrib on a group will simply set node-specific attributes on each individual
member of the group.

Additionally, if wanting to change from a node level attribute value to inherit from a
member group, it is required to use '-c' to clear the attribute.  Conversely, assigning
to a blank value will allow masking a group defined attribute with an empty value.

## OPTIONS

* `-b`, `--blame`:
  Annotate inherited and expression based attributes to show their base value.
  
* `-c`, `--clear`:
  Clear specified nodeattributes.
  
* `-e`, `--environment`:
  Set specified attributes based on exported environment variable of matching name. 
  Environment variable names may be lower case or all upper case. 
  Replace . with _ as needed (e.g. info.note may be specified as either $info_note or $INFO_NOTE)
  
* `-p`, `--prompt`:
  Request interactive prompting to provide values rather than the command line
  or environment variables.

* `-s`, `--set`:
  Set attributes using a batch file rather than the command line. The attributes in the batch file 
  can be specified as one line of key=value pairs simmilar to command line or each attribute can
  be in its own line. Lines that start with # sign will be read as a comment. See EXAMPLES for batch
  file syntax.   
 
* `-m MAXNODES`, `--maxnodes=MAXNODES`:
  Prompt if trying to set attributes on more than
  specified number of nodes.

* `-h`, `--help`:
  Show help message and exit

## EXAMPLES
* Listing matching nodes of a simple noderange:
    `# nodeattrib n1-n2`  
    `n1: console.method: ipmi`  
    `n1: hardwaremanagement.manager: 172.30.3.1`  
    `n2: console.method: ipmi`  
    `n2: hardwaremanagement.manager: 172.30.3.2`  

* Getting an attribute of nodes matching a noderange:
    `# nodeattrib n1,n2 hardwaremanagement.manager`  
    `n1: hardwaremanagement.manager: 172.30.3.1`  
    `n2: hardwaremanagement.manager: 172.30.3.2`  

* Getting a group of attributes while determining what group defines them:
    `# nodeattrib n1,n2 hardwaremanagement --blame`  
    `n1: hardwaremanagement.manager: 172.30.3.1`  
    `n1: hardwaremanagement.method: ipmi (inherited from group everything)`  
    `n1: net.switch: r8e1`  
    `n1: net.switchport: 14`  
    `n2: hardwaremanagement.manager: 172.30.3.2`  
    `n2: hardwaremanagement.method: ipmi (inherited from group everything)`  
    `n2: net.switch: r8e1`  
    `n2: net.switchport: 2`  

* Listing matching nodes of a simple noderange that are set:
    `# nodeattrib n1-n2 current`  
    `n1: console.method: ipmi`  
    `n1: hardwaremanagement.manager: 172.30.3.1`  
    `n2: console.method: ipmi`  
    `n2: hardwaremanagement.manager: 172.30.3.2`  

* Change attribute on nodes of a simple noderange:
    `# nodeattrib n1-n2 console.method=serial`  
    `n1: console.method: serial`  
    `n1: hardwaremanagement.manager: 172.30.3.1`  
    `n2: console.method: serial`  
    `n2: hardwaremanagement.manager: 172.30.3.2`  

* Clear attribute on nodes of a simple noderange, if you want to retain the variable set the attribute to "":
    `# nodeattrib n1-n2 -c console.method`  
    `# nodeattrib n1-n2 console.method`  
    `n1: console.method: `  
    `n2: console.method: `  

* List all switches that a node is described as connected to:
    `# nodeattrib d1 net.*switch`  
    `d1: net.mgt.switch: mgtswitch1`  
    `d1: net.pxe.switch: pxeswitch1`  
    `d1: net.switch:`  

* Setting attributes using a batch file with syntax similar to command line:
    `# cat nodeattributes.batch`  
    `# power`
    `power.psu1.outlet=3 power.psu1.pdu=pdu2`
    `# nodeattrib n41 -s nodeattributes.batch`
    `n41: 3`
    `n41: pdu2`

* Setting attributes using a batch file with syntax where each attribute is in its own line:
    `# cat nodeattributes.batch`  
    `# management`
    `custom.mgt.switch=switch_main`
    `custom.mgt.switch.port=swp4`
    `# nodeattrib n41 -s nodeattributes.batch`
    `n41: switch_main`
    `n41: swp4`

  

## SEE ALSO

nodegroupattrib(8), nodeattribexpressions(5)

## ATTRIBUTES
