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cf-hub connects to cf-serverd instances to collect data about a host managed by CFEngine. cf-agent and cf-monitord both store data at host in local databases. cf-hub connects to a cf-serverd instance running at a host and collect the data into its own central database. cf-hub automatically schedules data collection from hosts that have registered a connection with a collocated cf-serverd

cf-hub keeps the promises made in common, and is affected by common and hub control bodies.

cf-hub collects data generated from the default run only, what you'd get if you ran cf-agent without specifying a file name. This is to avoid reporting on data generated by test or extraordinary executions.

Notes:

  • cf-hub always considers the class hub to be defined.

Command reference

[%CFEngine_include_snippet(cf-hub.help, [\s]*--[a-z], ^$)%]

Control promises

body hub control
{
export_zenoss => "/var/www/reports/summary.z";
}

exclude_hosts

Description: A list of IP addresses of hosts to exclude from report collection

This list of IP addresses will not be queried for reports by cf-hub, even though they are in the last-seen database.

The lists may contain network addresses in CIDR notation or regular expressions to match the IP address. However, host names are currently not supported.

Type: slist

Allowed input range: (arbitrary string)

Example:

body hub control
{
exclude_hosts => { "192.168.12.21", "10.10", "10.12.*" };
}

Notes:

History: Was introduced in 3.3.0, Enterprise 2.1.1 (2011)

hub_schedule

Description: List of classes indicating when pull collection round should be initiated.

Type: slist

Allowed input range: (arbitrary string)

Default value: { "Min00", "Min05", "Min10", "Min15", "Min20", "Min25", "Min30", "Min35", "Min40", "Min45", "Min50", "Min55" }

Example:

body hub control
{

  # Collect reports every at the top and half of the hour. Additionally collect
  # reports during the evening or night between Minute 45 and 50.

  hub_schedule => { "Min00", "Min30", "(Evening|Night).Min45_50" };

}

History:

  • Introduced in version 3.1.0b1, Enterprise 2.0.0b1 (2010)

query_timeout

Description: Timeout (s) for connecting to host when querying.

Type: int

Allowed input range: (0,300)

Default value: 30

Example:

body hub control
{
  # Configure network connection timeout when connecting to hosts
  # for querying reporting data.
  query_timeout => "10";

}

Notes:

This timeout is for individual connection attempts. cf-hub will retry many times if it fails to connect. The total time it uses for one host before giving up can be up to 10 times the configured query_timeout.

Also note that this value is passed to the underlying OS code (select()), there is no guarantee that it will wait for that long.

This parameter can also be set using the command line option, --query-timeout. If specified in both policy and command line, the command line option takes precedence. If one of the options (command line or policy) specifies 0, the other one is used. If both are not specified (or 0), the default is used.

History:

  • Introduced in version 3.15.0

port

Description: Default port for contacting hosts

Type: int

Allowed input range: 1024,99999

Default value: 5308

Examples:

body hub control
{
port => "5308";
}

body server control
{
specialhost::
 port => "5308";

!specialhost::
 port => "5308";
}

Notes:

The standard or registered port number is tcp/5308. CFEngine does not presently use its registered udp port with the same number, but this could change in the future.

Changing the standard port number is not recommended practice. You should not do it without a good reason.

client_history_timeout

Description: If the hub can't reach a client for this many (or more) hours, it will not collect the missed reports and it will continue collection from current time. This is done to speed-up report collection and minimize data transfer. The default value is 6 hours.

Type: int

Allowed input range: 1,65535

Default value: 6

Examples:

body hub control
{
client_history_timeout => 6;
}

History: Was introduced in version 3.6.4 and is not compatible with older CFEngine versions.

Deprecated attributes

export_zenoss

History:

  • deprecated in 3.6.0
  • introduced in version 3.1.0, Enterprise 2.0.0 (2010)