# Can I add loadbalance to filebeat config for hosts in logstash output?
**URL:** https://discuss.elastic.co/t/can-i-add-loadbalance-to-filebeat-config-for-hosts-in-logstash-output/53378
**Category:** Beats
**Tags:** filebeat
**Created:** [June 20, 2016, 10:53pm UTC](https://discuss.elastic.co/t/can-i-add-loadbalance-to-filebeat-config-for-hosts-in-logstash-output/53378 "2016-06-20T22:53:33Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@nanshan](https://discuss.elastic.co/u/nanshan)
#### Post date: [June 20, 2016, 10:53pm UTC](https://discuss.elastic.co/t/can-i-add-loadbalance-to-filebeat-config-for-hosts-in-logstash-output/53378/1 "2016-06-20T22:53:33Z")
[https://www.elastic.co/guide/en/beats/filebeat/current/logstash-output.html](https://www.elastic.co/guide/en/beats/filebeat/current/logstash-output.html)
It says I can add a list of hosts in logstash output and enable loadbalancer
but I am not sure if I can just add the loadbalancer like : logstashhosts:5044
logstashhosts is the name of a lb for logstash
---
### Author:  [@steffens](https://discuss.elastic.co/u/steffens)
#### Post date: [June 21, 2016, 11:28am UTC](https://discuss.elastic.co/t/can-i-add-loadbalance-to-filebeat-config-for-hosts-in-logstash-output/53378/2 "2016-06-21T11:28:12Z")
> [@nanshan](#):
>
> but I am not sure if I can just add the loadbalancer like : logstashhosts:5044logstashhosts is the name of a lb for logstash
I don't understand. Can you post sample configs?
e.g.
```auto
filebeat:
...
spool_size: 4096
...
output:
logstash:
hosts:
- logstash1:5044
- logstash2:5044
loadbalance: true
bulk_max_size: 2048
worker: 1
```
will get you some lock-step load-balancing. For lock-step loadbalancing use `spool_size = worker * #hosts * bulk_max_size`. Having just one host one can do (2 load balance workers):
```auto
filebeat:
...
spool_size: 4096
...
output:
logstash:
hosts:
- logstash:5044
loadbalance: true
bulk_max_size: 2048
worker: 2
```
---
### Author:  [@nanshan](https://discuss.elastic.co/u/nanshan)
#### Post date: [June 21, 2016, 4:54pm UTC](https://discuss.elastic.co/t/can-i-add-loadbalance-to-filebeat-config-for-hosts-in-logstash-output/53378/3 "2016-06-21T16:54:41Z")
sorry , let me make my question more clear.
output:
logstash:
hosts:
- logstash1:5044
- logstash2:5044
for the above configuration, can I give a loadbalancer name instead of giving a list of logstash hosts???
Or I am misunderstanding loadbalancer here?
---
### Author:  [@steffens](https://discuss.elastic.co/u/steffens)
#### Post date: [June 22, 2016, 3:41pm UTC](https://discuss.elastic.co/t/can-i-add-loadbalance-to-filebeat-config-for-hosts-in-logstash-output/53378/4 "2016-06-22T15:41:08Z")
what kind of load-balancer are you using?
---
### Author:  [@nanshan](https://discuss.elastic.co/u/nanshan)
#### Post date: [June 22, 2016, 6:07pm UTC](https://discuss.elastic.co/t/can-i-add-loadbalance-to-filebeat-config-for-hosts-in-logstash-output/53378/5 "2016-06-22T18:07:33Z")
ELB
you are giving a list of logstash hosts, what if the two hosts are behind a loadbalancer?
---
### Author:  [@steffens](https://discuss.elastic.co/u/steffens)
#### Post date: [June 22, 2016, 9:31pm UTC](https://discuss.elastic.co/t/can-i-add-loadbalance-to-filebeat-config-for-hosts-in-logstash-output/53378/6 "2016-06-22T21:31:07Z")
The AWS ELB? Logstash output is not using HTTP, but sits right on top of TCP. ELB will balance connections round-robin. That is you can use logstash with `worker: 2` settings and the balancer it's address. But filebeat will keep connection until one logstash instance goes away. Starting multiple beats at the same time, there is a chance a beat might get all workers assigned to same host by ELB.
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 11, 2016, 10:53pm UTC](https://discuss.elastic.co/t/can-i-add-loadbalance-to-filebeat-config-for-hosts-in-logstash-output/53378/7 "2016-07-11T22:53:42Z")
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