tail

TAIL

Synopsys

Details

close_older

• Value type is int
• Default value is 3600

Closes any files that were last read the specified timespan in seconds ago. Default value is 3600 (i.e. 1 hour) This has different implications depending on if a file is being tailed or read. If tailing, and there is a large time gap in incoming data the file can be closed (allowing other files to be opened) but will be queued for reopening when new data is detected. If reading, the file will be closed after close_older seconds from when the last bytes were read.

codec

• Value type is codec
• Default value is "line"

The codec used for input data. Input codecs are a convenient method for decoding your data before it enters the input, without needing a separate filter in your bitfan pipeline

delimiter

• Value type is string
• Default value is "\n"

Set the new line delimiter. Default value is "\n"

discover_interval

• Value type is int
• Default value is 15

How often (in seconds) we expand the filename patterns in the path option to discover new files to watch. Default value is 15

exclude

• Value type is array
• Default value is []

Exclusions (matched against the filename, not full path). Filename patterns are valid here, too.

ignore_older

• Value type is int
• Default value is 86400

When the file input discovers a file that was last modified before the specified timespan in seconds, the file is ignored. After it’s discovery, if an ignored file is modified it is no longer ignored and any new data is read. Default value is 86400 (i.e. 24 hours)

max_open_files

• Value type is string
• Default value is ""

What is the maximum number of file_handles that this input consumes at any one time. Use close_older to close some files if you need to process more files than this number.

path

• This is a required setting.
• Value type is array
• Default value is []

The path(s) to the file(s) to use as an input. You can use filename patterns here, such as /var/log/.log. If you use a pattern like /var/log/**/.log, a recursive search of /var/log will be done for all *.log files. Paths must be absolute and cannot be relative. You may also configure multiple paths.

sincedb_path

• Value type is string
• Default value is ".sincedb.json"

Path of the sincedb database file The sincedb database keeps track of the current position of monitored log files that will be written to disk.

sincedb_write_interval

• Value type is int
• Default value is 15

How often (in seconds) to write a since database with the current position of monitored log files. Default value is 15

start_position

• Value type is string
• Default value is "end"

Choose where BitFan starts initially reading files: at the beginning or at the end. The default behavior treats files like live streams and thus starts at the end. If you have old data you want to import, set this to beginning. This option only modifies "first contact" situations where a file is new and not seen before, i.e. files that don’t have a current position recorded in a sincedb file. If a file has already been seen before, this option has no effect and the position recorded in the sincedb file will be used. Default value is "end" Value can be any of: "beginning", "end"

stat_interval

• Value type is int
• Default value is 1

How often (in seconds) we stat files to see if they have been modified. Increasing this interval will decrease the number of system calls we make, but increase the time to detect new log lines. Default value is 1

Configuration blueprint

tail{
	close_older => 3600
	codec => "line"
	delimiter => "\n"
	discover_interval => 15
	exclude => []
	ignore_older => 86400
	max_open_files => ""
	path => []
	sincedb_path => ".sincedb.json"
	sincedb_write_interval => 15
	start_position => "end"
	stat_interval => 1
}