Plugin Name: ProcessDirectoryInput
New in version 0.5.
The ProcessDirectoryInput periodically scans a filesystem directory looking for ProcessInput configuration files. The ProcessDirectoryInput will maintain a pool of running ProcessInputs based on the contents of this directory, refreshing the set of running inputs as needed with every rescan. This allows Heka administrators to manage a set of data collection processes for a running hekad server without restarting the server.
Each ProcessDirectoryInput has a process_dir configuration setting, which is the root folder of the tree where scheduled jobs are defined. It should contain exactly one nested level of subfolders, named with ASCII numeric characters indicating the interval, in seconds, between each process run. These numeric folders must contain TOML files which specify the details regarding which processes to run.
For example, a process_dir might look like this:
-/usr/share/heka/processes/ |-5 |- check_myserver_running.toml |-61 |- cat_proc_mounts.toml |- get_running_processes.toml |-302 |- some_custom_query.toml
This indicates one process to be run every five seconds, two processes to be run every 61 seconds, and one process to be run every 302 seconds.
Note that ProcessDirectoryInput will ignore any files that are not nested one level deep, are not in a folder named for an integer 0 or greater, and do not end with ‘.toml’. Each file which meets these criteria, such as those shown in the example above, should contain the TOML configuration for exactly one Process Input, matching that of a standalone ProcessInput with the following restrictions:
By default, if the specified process fails to run or the ProcessInput config fails for any other reason, ProcessDirectoryInput will log an error message and continue, as if the ProcessInput’s can_exit flag has been set to true. If the managed ProcessInput’s can_exit flag is manually set to false, it will trigger a Heka shutdown.
Amount of time, in seconds, between scans of the process_dir. Defaults to 300 (i.e. 5 minutes).
This is the root folder of the tree where the scheduled jobs are defined. Absolute paths will be honored, relative paths will be computed relative to Heka’s globally specified share_dir. Defaults to “processes” (i.e. “$share_dir/processes”).
A sub-section that specifies the settings to be used for restart behavior of the ProcessDirectoryInput (not the individual ProcessInputs, which are configured independently). See Configuring Restarting Behavior
[ProcessDirectoryInput] process_dir = "/etc/hekad/processes.d" ticker_interval = 120