Search Nodes

You can navigate to Node Management > Search Nodes to display information about the Nodes which have been already validated, and are managed by Rudder.

General behavior

In the Advanced Search tool, you can create complex searches based on Node Inventory information. The benefit of the Advanced Search tool is to save the query and create a Group of Nodes based on the search criteria.

  • 1. Select a field

The selection of the field upon which the criteria will apply is a two step process. The list of fields is not displayed unordered and extensively. Fields have been grouped in the same way they are displayed when you look at information about a Node. First you choose among these groups: Node, Network Interface, Filesystem, Machine, RAM, Storage, BIOS, Controller, Port, Processor, Sound Card, Video Card, Software, Environment Variable, Processes, Virtual Machines; then you choose among the list of fields concerning this theme.

  • 2. Select the matching rule

The matching rule can be selected between following possibilities: Is defined, Is not defined, =, ≠' or 'Regex followed by the term you are searching for presence or absence. Depending on the field, the list of searchable terms is either an free text field, either the list of available terms.

  • 3. Add another rule

You can select only one term for each matching rule. If you want to create more complex search, then you can add another rule using the + icon. All rules are using the same operand, either AND or OR. More complex searches mixing AND and OR operands are not available at the moment.

Example 6. Advanced search for Linux Nodes with ssh.

Assuming you want to search all Linux Nodes having ssh installed. You will create this 2 lines request:

  1. Operator: AND.
  2. First search line: Node, Operating System, =, Linux.
  3. Second search line: Software, Name, =, ssh.

Search numbers with units

Some parameters for the advanced search tool allow using units. For example, in the search criterion for RAM size, you can type 512MB instead of a value in bytes. This paragraph describes supported units by parameter type.

Bytes and multiples

All criteria using a memory size (RAM, hard disk capacity, etc) is by default expected in bytes. If no other unit is specified, all values will be assumed to be in bytes.

Convenience notation

All memory sizes can be written using spaces or underscores (_) to make the numbers easier to read. Numbers must begin with a digit. For example, the following numbers are all valid and all worth 1234:

1 234

The following number is not valid:


Supported units

Units used are non binary units, and a multiplication factor of 1024 is applied between each unit. Units are case-insensitive. Therefore, Mb is identical to mB or mb or MB.

In detail, the following units are supported (provided in lower case, see above):

Table 9. Units supported by Rudder search engine

Notation Alternate Value



bytes (equivalent to not specifying a unit)



1024 bytes



1024^2 bytes



1024^3 bytes



1024^4 bytes



1024^5 bytes



1024^6 bytes



1024^7 bytes



1024^8 bytes

Regex matching rule

You can use regular expressions to find whatever you want in Node inventories. A search request using a regexp will look for every node that match the pattern you entered.

Those regexps follow Java Pattern rules. See for more details.

Example 7. Search node having an ip address matching 192.168.x.y

Assuming you want to search every node using an ip address match 192.168.x.y, where x<10 and y could be everything. You will to add that line to your search request:

  • Node summary, Ip address, Regex, 192\ .168\ .\d\ . .*

Composite search (name=value)

Some fields allow you to look for more than one piece of information at a time. That’s the case for environment variable. For those fields you have to enter the first element then the separator then following elements. The name of the fields tells you about what is expected. It would look like firstelement<sep>secondelement assuming that <sep> is the separator.

Example 8. Search Environment Variable LANG=C.

Assuming you want to search every node having the environment variable LANG set to C. You will have to add that search line to your request:

  • Environment variable, Name=Value, =, LANG=C.

Node properties search

Node properties are special because they support both key=value and key=JSON content. As of Rudder 4.3.2, we have the possibility to choose among three operator givent the use case, so let’s see which is the best on each case.

Check for property existence: [Name equals]

The Name equals operator allows to find all nodes which have the property with the given name defined. That operator only look for the property name and don’t care if the value is a string or a JSON one.

Example 9. Search for nodes with the property datacenter defined

  • Environment variable, Name=Value, Name equals, datacenter.

Lookup node by property name=value pair

If you want to lookup nodes by a property name and its value, you can use the "name=value" operator, as explained in paragraph "composite search" above.

Please note that if the value is JSON, you will need to use the exact serialization of the JSON value (in a compact formating: no spaces, etc). It is generally not what you want to do with JSON value, and for them it is better to use JSON path query (see below).

Example 10. Search for the node property "datacenter" with value "Paris"

  • Properties, Name=Value, =, datacenter=Paris.

Lookup node by property name=value pair with regex

You can also use regex on node properties name and value. The regex can be done on each part, so the following examples allow to fill different purposes:

Example 11. Search for nodes with a property whose value is "Paris" whatever its name

  • Properties, Name=Value, regex, .*=Paris.

Example 12. Search for nodes with a property whose name is "datacenter" and value contains "Paris"

  • Properties, Name=Value, regex, datacenter=.Paris..

Example 13. Search for nodes with a property whose name starts with "datacenter" and value contains "Paris"

  • Properties, Name=Value, regex, datacenter.=.*Paris..

JSON Path queries on Node Properties

Since Rudder 4.3.2, you can use a JSON path query to lookup nodes based of specific feature of the JSON value of a node property.

The operator is Name:JSON Path and the general usage is:

Example 14. Search for nodes with a property by JSON path query

  • Properties, Name=Value, Name:JSON Path, datacenter:json-path-query.

Where json-path-query is JSON path selector from Nodes are selected if the JSON path selector result is not empty, i.e if the JSON value contains selected elements.

For example, let’s say you have a node with a property whose name is datacenter and value is:

{ "id": "xxxxxx", "accepted": true, "location": { "name": "Paris-03", "address": { "continent": "Europe", "city": "Paris", } }, "environments": ["prod","dev"] }

The following query would all select the node:

Example 15. Example of JSON path queries

Properties, Name=Value, Name:JSON Path, datacenter:$.[?(@.accepted==true)]

Properties, Name=Value, Name:JSON Path, datacenter:$.location.address[?('Paris)]'

Properties, Name=Value, Name:JSON Path, datacenter:$

Properties, Name=Value, Name:JSON Path, datacenter:$.location[?([0-9]+/)]

Properties, Name=Value, Name:JSON Path, datacenter:$.[?(@.environements subsetof ['prod, qa, dev])]'