Setup Filebeat with UDP input .. several questions

Hi, I'm trying to grab a udp stream of double values (8 bytes) via udp input plugin of filebeat.

The connection is between two servers in the same subnet, there shouldn't be any issue.

I changed the filebeat.yml like this to keep the start as simple as possible:

type: udp
enabled: true
host: ""

When I start filebeat I get one error regarding the port. If I put in a port it is:

2020-10-19T11:35:20.982+0200 ERROR udp/input.go:106 Error running harvester: listen udp bind: cannot assign requested address

If not it is:

2020-10-19T11:27:23.899+0200 ERROR udp/input.go:106 Error running harvester: address missing port in address

The second issue I have is understanding the periodically upcoming monitoring messages. The udp sender sends 100 double values a second and I wonder where in the message I would recognize if I received them or not:

2020-10-19T11:37:14.079+0200 INFO [monitoring] log/log.go:145 Non-zero metrics in the last 30s {"monitoring": {"metrics": {"beat":{"cpu":{"system":{"ticks":20,"time":{"ms":1}},"total":{"ticks":90,"time":{"ms":9},"value":90},"user":{"ticks":70,"time":{"ms":8}}},"handles":{"limit":{"hard":1048576,"soft":1024},"open":11},"info":{"ephemeral_id":"c103e98f-6c7c-4c53-80f1-8b549508e030","uptime":{"ms":90025}},"memstats":{"gc_next":9499200,"memory_alloc":7560920,"memory_total":16450560},"runtime":{"goroutines":55}},"filebeat":{"events":{"added":1,"done":1},"harvester":{"open_files":2,"running":2}},"libbeat":{"config":{"module":{"running":0}},"output":{"events":{"acked":1,"batches":1,"total":1},"read":{"bytes":347},"write":{"bytes":2447}},"pipeline":{"clients":5,"events":{"active":0,"published":1,"total":1},"queue":{"acked":1}}},"registrar":{"states":{"current":11,"update":1},"writes":{"success":1,"total":1}},"system":{"load":{"1":0.1,"15":0.08,"5":0.08,"norm":{"1":0.0167,"15":0.0133,"5":0.0133}}}}}}

I couldn't find any tutorial or example to explain the output I receive.
Thanks in advance for your help!

Maybe it wasn't smart to put 2 questions into it. Maybe someone could help with the first problem. The binding of a port doesn't work, even on a free port on the localhost I get this error :confused:

I still couldn't receive any udp messages


The error is because of the IP you are using. You can try with localhost, or to fix it.

Hi Chris, thank you for your answer.
Indeed, using localhost:7200, for instance, works without an error. So I guess I have to talk to the people who set up our virtual machines why they can't connect to each other.

About my other question: Any recommended sources where I can learn what all the monitoring output of the udp plugin means?


UDP input is just an input method. So the output it will provide has to do with the data that you are forwarding to it.

But there is a lot of metadata that gets put out in the console (see my original post)
I found it hard to figure out what's actually happening after "Non-zero metrics in the last 30s" ..

The output you see (after Non-zero metrics in the last 30s) is reporting Filebeat's internal metrics like how many events have been processed etc..

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