Http_poller – Run once and terminate

Elastic Stack Logstash
1

Hi,

I want to use the Http_poller input plugin to call a REST API only once. The actual scheduling is done outside of Logstash (Docker).
To make this happen, I set the schedule attribute to { "in" => "0" }, which indeed triggers the request once and immediately. Unfortunately the Http_poller plugin does not terminate, so Logstash does not terminate, so the Docker container does not terminate, which is bad in my situation.
Am I doing something wrong? Can you help me out?

Thanks

2 Likes
2

Nope, Logstash assumes it has something else it needs to run and so persists.

What does the rest of your pipeline do?

3

For testing purposes literally nothing.

Test it yourself:

input {
  http_poller {
    urls => {
      google => {
        url => "http://google.de"
      }
    }
    codec => "plain"
    schedule => { "in" => "0" }
  }
}

#output { stdout { } }
4

Well I ask cause you might just want to use curl and keep it simple.

5

Thanks for the hint, but parsing the output of curl in a pain with multiline codec or the like.
Any ideas why Http_poller is not working the way we expect it?

6

It wasn't designed as a run once approach, the assumption is that you will want to continually connect to get the data. It might be worth raising a feature request to cater for this behaviour if you want it.

You may also want to look at the exec input and use curl to get it that way.

2 Likes
7

Okay, thank you.

8

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