Health
Health input plugin allows you to check how healthy a TCP server is. It does the check by issuing a TCP connection every a certain interval of time.
The plugin supports the following configuration parameters:
Key | Description |
Host | Name of the target host or IP address to check. |
Port | TCP port where to perform the connection check. |
Interval_Sec | Interval in seconds between the service checks. Default value is 1. |
Internal_Nsec | Specify a nanoseconds interval for service checks, it works in conjuntion with the Interval_Sec configuration key. Default value is 0. |
Alert | If enabled, it will only generate messages if the target TCP service is down. By default this option is disabled. |
Add_Host | If enabled, hostname is appended to each records. Default value is false. |
Add_Port | If enabled, port number is appended to each records. Default value is false. |
In order to start performing the checks, you can run the plugin from the command line or through the configuration file:
From the command line you can let Fluent Bit generate the checks with the following options:
$ fluent-bit -i health://127.0.0.1:80 -o stdout
In your main configuration file append the following Input & Output sections:
[INPUT]Name healthHost 127.0.0.1Port 80Interval_Sec 1Interval_NSec 0​[OUTPUT]Name stdoutMatch *
Once Fluent Bit is running, you will see some random values in the output interface similar to this:
$ fluent-bit -i health://127.0.0.1:80 -o stdoutFluent Bit v1.x.x* Copyright (C) 2019-2020 The Fluent Bit Authors* Copyright (C) 2015-2018 Treasure Data* Fluent Bit is a CNCF sub-project under the umbrella of Fluentd* https://fluentbit.io​[2016/10/07 21:37:51] [ info] [engine] started[0] health.0: [1475897871, {"alive"=>true}][1] health.0: [1475897872, {"alive"=>true}][2] health.0: [1475897873, {"alive"=>true}][3] health.0: [1475897874, {"alive"=>true}]
