Logstash for Vagrant: Address already in use - vagrant

Question

I have a Vagrant image in which there is an application; it is reachable in the Vagrant image if you call the port 2401 and depending on the service that you want, you call a specific address (i.e. "curl -X GET http://127.0.0.1:2401/provider/ipfix"). To retrieve the output outside the Vagrant machine I have set a port forwarding in the Vagrant file ("config.vm.network :forwarded_port, guest: 2401, host: 8080"), thus using the command "curl -X GET http://127.0.0.1:8080/provider/ipfix" from host I get the same output.
I am now on the phase of installing Logstash. My issue is that when I run Logstash with the config file I get the error "Address already in use". I tried to use also fields to guide to the specific output. Below is my Logstash config file. What workaround would you suggest?
input {
tcp {
host => localhost
port => 8080
add_field => {
"field1" => "provider"
"field2" => "ipfix"
}
codec => netflow {
versions => [10]
target => ipfix
}
type => ipfix
}
}
output {
stdout { codec => rubydebug }
elasticsearch {
index => "IPFIX-logstash-%{+YYYY.MM.dd}"
}
}

Answer 1

If I'm reading this right, you're expecting Logstash to use TCP to connect to localhost:8080 to fetch information that it will then process.
That's not what this input does. This creates a listener on 127.0.0.1:8080, so the error message about 'already in use' is quite correct.
Considering you're using curl as an example of fetching this data, I suggest the http_poller plugin is better for what you want.
input {
http_poller {
urls => {
IPFIX => "http://127.0.0.1:8080/provider/ipfix"
}
request_timeout => 30
schedule => { "every" => "5s" }
add_tags => [ 'ipfix' ]
}
}
This will hit the known-working CURL URL every 5 seconds with a GET request.