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Head

The head input plugin, allows to read events from the head of file. It's behavior is similar to the head command.

Configuration Parameters

The plugin supports the following configuration parameters:

Split Line Mode

This mode is useful to get a specific line. This is an example to get CPU frequency from /proc/cpuinfo.

/proc/cpuinfo is a special file to get cpu information.

Cpu frequency is "cpu MHz : 2791.009". We can get the line with this configuration file.

Output is

Getting Started

In order to read the head of a file, you can run the plugin from the command line or through the configuration file:

Command Line

The following example will read events from the /proc/uptime file, tag the records with the uptime name and flush them back to the stdout plugin:

Configuration File

In your main configuration file append the following Input & Output sections:

Note: Total interval (sec) = Interval_Sec + (Interval_Nsec / 1000000000).

e.g. 1.5s = 1s + 500000000ns

Head

The head input plugin, allows to read events from the head of file. It's behavior is similar to the head command.

Configuration Parameters

The plugin supports the following configuration parameters:

Split Line Mode

This mode is useful to get a specific line. This is an example to get CPU frequency from /proc/cpuinfo.

/proc/cpuinfo is a special file to get cpu information.

Cpu frequency is "cpu MHz : 2791.009". We can get the line with this configuration file.

Output is

Getting Started

In order to read the head of a file, you can run the plugin from the command line or through the configuration file:

Command Line

The following example will read events from the /proc/uptime file, tag the records with the uptime name and flush them back to the stdout plugin:

Configuration File

In your main configuration file append the following Input & Output sections:

Note: Total interval (sec) = Interval_Sec + (Interval_Nsec / 1000000000).

e.g. 1.5s = 1s + 500000000ns

processor    : 0
vendor_id    : GenuineIntel
cpu family    : 6
model        : 42
model name    : Intel(R) Core(TM) i7-2640M CPU @ 2.80GHz
stepping    : 7
microcode    : 41
cpu MHz        : 2791.009
cache size    : 4096 KB
physical id    : 0
siblings    : 1

[INPUT]
    Name           head
    Tag            head.cpu
    File           /proc/cpuinfo
    Lines          8
    Split_line     true
    # {"line0":"processor    : 0", "line1":"vendor_id    : GenuineIntel" ...}

[FILTER]
    Name           record_modifier
    Match          *
    Whitelist_key  line7

[OUTPUT]
    Name           stdout
    Match          *

$ bin/fluent-bit -c head.conf 
Fluent-Bit v0.12.0
Copyright (C) Treasure Data

[2017/06/26 22:38:24] [ info] [engine] started
[0] head.cpu: [1498484305.000279805, {"line7"=>"cpu MHz        : 2791.009"}]
[1] head.cpu: [1498484306.011680137, {"line7"=>"cpu MHz        : 2791.009"}]
[2] head.cpu: [1498484307.010042482, {"line7"=>"cpu MHz        : 2791.009"}]
[3] head.cpu: [1498484308.008447978, {"line7"=>"cpu MHz        : 2791.009"}]

$ fluent-bit -i head -t uptime -p File=/proc/uptime -o stdout -m '*'
Fluent-Bit v0.8.0
Copyright (C) Treasure Data

[2016/05/17 21:53:54] [ info] starting engine
[0] uptime: [1463543634, {"head"=>"133517.70 194870.97"}]
[1] uptime: [1463543635, {"head"=>"133518.70 194872.85"}]
[2] uptime: [1463543636, {"head"=>"133519.70 194876.63"}]
[3] uptime: [1463543637, {"head"=>"133520.70 194879.72"}]

processor    : 0
vendor_id    : GenuineIntel
cpu family    : 6
model        : 42
model name    : Intel(R) Core(TM) i7-2640M CPU @ 2.80GHz
stepping    : 7
microcode    : 41
cpu MHz        : 2791.009
cache size    : 4096 KB
physical id    : 0
siblings    : 1

[INPUT]
    Name           head
    Tag            head.cpu
    File           /proc/cpuinfo
    Lines          8
    Split_line     true
    # {"line0":"processor    : 0", "line1":"vendor_id    : GenuineIntel" ...}

[FILTER]
    Name           record_modifier
    Match          *
    Whitelist_key  line7

[OUTPUT]
    Name           stdout
    Match          *

$ bin/fluent-bit -c head.conf 
Fluent-Bit v0.12.0
Copyright (C) Treasure Data

[2017/06/26 22:38:24] [ info] [engine] started
[0] head.cpu: [1498484305.000279805, {"line7"=>"cpu MHz        : 2791.009"}]
[1] head.cpu: [1498484306.011680137, {"line7"=>"cpu MHz        : 2791.009"}]
[2] head.cpu: [1498484307.010042482, {"line7"=>"cpu MHz        : 2791.009"}]
[3] head.cpu: [1498484308.008447978, {"line7"=>"cpu MHz        : 2791.009"}]

$ fluent-bit -i head -t uptime -p File=/proc/uptime -o stdout -m '*'
Fluent-Bit v0.8.0
Copyright (C) Treasure Data

[2016/05/17 21:53:54] [ info] starting engine
[0] uptime: [1463543634, {"head"=>"133517.70 194870.97"}]
[1] uptime: [1463543635, {"head"=>"133518.70 194872.85"}]
[2] uptime: [1463543636, {"head"=>"133519.70 194876.63"}]
[3] uptime: [1463543637, {"head"=>"133520.70 194879.72"}]

Head

hashtagConfiguration Parameters

hashtagSplit Line Mode

hashtagGetting Started

hashtagCommand Line

hashtagConfiguration File

Head

hashtagConfiguration Parameters

hashtagSplit Line Mode

hashtagGetting Started

hashtagCommand Line

hashtagConfiguration File

Configuration Parameters

Split Line Mode

Getting Started

Command Line

Configuration File

Configuration Parameters

Split Line Mode

Getting Started

Command Line

Configuration File