# How to connect logstash from logstash?

**URL:** <https://discuss.elastic.co/t/how-to-connect-logstash-from-logstash/259258>\
**Category:** Logstash\
**Created:** [December 21, 2020, 1:33pm UTC](https://discuss.elastic.co/t/how-to-connect-logstash-from-logstash/259258 "2020-12-21T13:33:22Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![iooi](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/iooi/32/79231_2.png) [@iooi](https://discuss.elastic.co/u/iooi)\
**Post date:** [December 21, 2020, 1:33pm UTC](https://discuss.elastic.co/t/how-to-connect-logstash-from-logstash/259258/1 "2020-12-21T13:33:22Z")

</div>

I want to use one logstash send data to multiple logstash services.

If I use this setting in k8s, it can work.

service.yml

```auto
apiVersion: v1
kind: Service
metadata:
  labels:
    app: logstash
  name: logstash
spec:
  selector:
    app: logstash
  ports:
    - name: "5044"
      port: 5044
      targetPort: 5044

```

filebeat.yml

```auto
    filebeat.inputs:
      - type: log
        enabled: true
        paths:
          - /var/log/log1.json
        tags: ["log1"]

    processors:
      - decode_json_fields:
          fields: ["message"]
          process_array: true
          max_depth: 1
          target: ""
          overwrite_keys: true
          add_error_key: false

    output.logstash:
      hosts: ["logstash-log1.default.svc.cluster.local:5044"]

```

logstash.yml

```auto
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: configmap-logstash
data:
  logstash.yml: |
    http.host: "0.0.0.0"
    path.config: /usr/share/logstash/pipeline
    xpack.monitoring.enabled: false
  logstash.conf: |
    input {
      beats {
        port => 5044
      }
    }

    filter {
    }

    output {
      stdout { codec => rubydebug }
    }

```

But if I change to another way, set output from another logstash instance as:

k8s services:

```auto
---
apiVersion: v1
kind: Service
metadata:
  labels:
    app: logstash-log1
  name: logstash-log1
spec:
  selector:
    app: logstash-log1
  ports:
    - name: "5044"
      port: 5044
      targetPort: 5044

```

logstash.yml

```auto
    output {
      if "log1" in [tags] {
        stdout { codec => rubydebug }
        tcp {
          mode => "client"
          host => "logstash-log1.default.svc.cluster.local"
          port => 5044
          codec => "json"
        }
      }
    }

```

target logstash's logstash.yml

```auto
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: configmap-logstash
data:
  logstash.yml: |
    http.host: "0.0.0.0"
    path.config: /usr/share/logstash/pipeline
    xpack.monitoring.enabled: false
  logstash.conf: |
    input {
      tcp {
        port => 5044
      }
    }

    filter {
    }

    output {
      stdout { codec => rubydebug }
    }

```

The communication can be confimed, it works. But the data seems didn't send to `logstash-log1.default.svc.cluster.local:5044`.

If use curl to test from origin logstash,

```auto
curl logstash-log1.default.svc.cluster.local:5044

```

Can get log data in the target logstash:

```auto
{
  "port" => 37424,
  "host" => "10.12.8.213"
}
{
  "port" => 37424,
  "host" => "10.12.8.213"
}
{
  "port" => 37424,
  "host" => "10.12.8.213"
}
{
  "port" => 37424,
  "host" => "10.12.8.213"
}

```

So the problem may be the configuration between 2 logstash. Doesn't tcp input/output methods work?

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [January 18, 2021, 1:33pm UTC](https://discuss.elastic.co/t/how-to-connect-logstash-from-logstash/259258/2 "2021-01-18T13:33:37Z")

</div>

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