Gelf listener dies when used at the same time as other inputs

[mijamo]

I have a weird issue. My gelf input was working just fine until recently, but since I added another input (from google pub/sub), it crashes after some time because of a SocketError. the timing for the failure seems to be always around 1 day.

The error thrown is the following : <SocketError: recvfrom: name or service not known> with a stacktrace pointing to https://github.com/logstash-plugins/logstash-input-gelf/blob/7d5593009aaa202723a9fc71fbbb63964d62fbb8/lib/logstash/inputs/gelf.rb#L101

That error seems to completely crash Logstash, which is maybe a separate issue, as I would except the listener to just restart in such a situation.

If I remove the google_pubsub listener, gelf works again as expected (now running for 7 days without issue, but with pubsub it was consistently failing after 1 day 6 times in a row).

• Version: Latest (3.0.6)

• Operating System: Docker Logstash

• Config File:

  input {
  gelf {
  host => "::"
  type => "gelf"
  }
  
  google_pubsub {
  project_id => "my-project"
  topic => "my-topic"
  subscription => "logstash-sub"
  json_key_file => "/usr/share/logstash/google_pubsub/key.json"
  }
  }

• Steps to Reproduce:

  • Create a config with only gelf -> everything works
  • Create a config with gelf + another input -> Logstash crashes after 1 day