# Logstash Lumberjack Output

**URL:** <https://discuss.elastic.co/t/logstash-lumberjack-output/312646>\
**Category:** Logstash\
**Created:** [August 22, 2022, 5:55pm UTC](https://discuss.elastic.co/t/logstash-lumberjack-output/312646 "2022-08-22T17:55:33Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![6igwig](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/6igwig/32/88971_2.png) [@6igwig](https://discuss.elastic.co/u/6igwig)\
**Post date:** [August 22, 2022, 5:55pm UTC](https://discuss.elastic.co/t/logstash-lumberjack-output/312646/1 "2022-08-22T17:55:33Z")

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In the documentation for [lumberjack output](https://www.elastic.co/guide/en/logstash/current/plugins-outputs-lumberjack.html#plugins-outputs-lumberjack), under the [ssl\_certificate](https://www.elastic.co/guide/en/logstash/current/plugins-outputs-lumberjack.html#plugins-outputs-lumberjack-ssl_certificate) setting it just says, "This is a required setting" and "ssl certificate to use."

My questions are: what is this certificate used for, and why is it required? How do I perform client authentication, assuming this is not already being performed?

Note: I am sending logs from one logstash (client) to another (server). My server side is a beats input with no CA's specified and ssl\_verify\_mode =\> "none". When I tried adding the CA and specifying ssl\_verify\_mode to force\_peer it did not work.

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**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\
**Post date:** [August 22, 2022, 7:05pm UTC](https://discuss.elastic.co/t/logstash-lumberjack-output/312646/2 "2022-08-22T19:05:51Z")

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> [@6igwig](#):
>
> what is this certificate used for

The ruby [lumberjack client](https://github.com/elastic/ruby-lumberjack/blob/9df247e644eaf10fd634e00d255e09f2a4f7f7bf/lib/lumberjack/client.rb#L85) uses it. As I understand it the cert\_store should contain the CA of the server certificate that the client is to connect to. I see no way to enable client authentication.

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [September 19, 2022, 7:06pm UTC](https://discuss.elastic.co/t/logstash-lumberjack-output/312646/3 "2022-09-19T19:06:01Z")

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