# Logstash （It seems your ruby installation is missing psych (for YAML output).）

**URL:** <https://discuss.elastic.co/t/logstash-it-seems-your-ruby-installation-is-missing-psych-for-yaml-output/163834>\
**Category:** Logstash\
**Created:** [January 11, 2019, 2:37am UTC](https://discuss.elastic.co/t/logstash-it-seems-your-ruby-installation-is-missing-psych-for-yaml-output/163834 "2019-01-11T02:37:54Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Buxunxian](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/buxunxian/32/39663_2.png) [@Buxunxian](https://discuss.elastic.co/u/Buxunxian)\
**Post date:** [January 11, 2019, 2:37am UTC](https://discuss.elastic.co/t/logstash-it-seems-your-ruby-installation-is-missing-psych-for-yaml-output/163834/1 "2019-01-11T02:37:54Z")

</div>

log:

```
Jan 11 10:26:45 fnw-test-logstash-3 systemd[1]: logstash.service: main process exited, code=exited, status=143/n/a
Jan 11 10:26:45 fnw-test-logstash-3 systemd[1]: Stopped logstash.
Jan 11 10:26:45 fnw-test-logstash-3 systemd[1]: Unit logstash.service entered failed state.
Jan 11 10:26:45 fnw-test-logstash-3 systemd[1]: logstash.service failed.
Jan 11 10:26:45 fnw-test-logstash-3 systemd[1]: Started logstash.
Jan 11 10:26:51 fnw-test-logstash-3 logstash[18854]: uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/rubygems/core_ext/kernel_require.rb:59:in `require':
Jan 11 10:26:51 fnw-test-logstash-3 logstash[18854]: It seems your ruby installation is missing psych (for YAML output).
Jan 11 10:26:51 fnw-test-logstash-3 logstash[18854]: To eliminate this warning, please install libyaml and reinstall your ruby.
Jan 11 10:26:51 fnw-test-logstash-3 logstash[18854]: [ERROR] 2019-01-11 10:26:51.700 [main] Logstash - java.lang.IllegalStateException: Logstash stopped processing because of an error: (GemspecError) There was a LoadError while loading logstash-core.gemspec:
Jan 11 10:26:51 fnw-test-logstash-3 logstash[18854]: load error: psych -- java.lang.RuntimeException: BUG: we can not copy embedded jar to temp directory from
Jan 11 10:26:51 fnw-test-logstash-3 logstash[18854]: /usr/share/logstash/logstash-core/logstash-core.gemspec:1:in `block in (root)'
Jan 11 10:26:51 fnw-test-logstash-3 logstash[18854]: Does it try to require a relative path? That's been removed in Ruby 1.9.
Jan 11 10:26:51 fnw-test-logstash-3 systemd[1]: logstash.service: main process exited, code=exited, status=1/FAILURE
Jan 11 10:26:51 fnw-test-logstash-3 systemd[1]: Unit logstash.service entered failed state.
Jan 11 10:26:51 fnw-test-logstash-3 systemd[1]: logstash.service failed.
Jan 11 10:26:52 fnw-test-logstash-3 systemd[1]: logstash.service holdoff time over, scheduling restart.
Jan 11 10:26:52 fnw-test-logstash-3 systemd[1]: Stopped logstash.

```

logstash-kafka.conf:  
input {  
kafka {  
bootstrap\_servers =\> "10.39.40.25:9092,10.39.40.29i:9092,10.39.40.30:9092"  
topics =\> ["fnw\_logging\_kafka\_topic"]  
group\_id =\> "fnw-logstash-test"  
auto\_offset\_reset =\> "latest"  
consumer\_threads =\> 3  
decorate\_events =\> true  
type =\> "fnw-logstash-kafka"  
codec =\> json  
}  
}  
output {  
elasticsearch {  
hosts =\> ["10.39.40.2:9200,10.39.40.5:9200,10.39.40.6:9200"]  
action =\> "index"  
index =\> fnw\_test\_"%{type}-%{+YYYYMMdd}"  
}  
}

logstash.yml:  
node.name: fnw-test-logstash-3  
path.data: /data/logstash  
path.logs: /data/logstash-log  
other config default...

---

<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:** [February 8, 2019, 2:37am UTC](https://discuss.elastic.co/t/logstash-it-seems-your-ruby-installation-is-missing-psych-for-yaml-output/163834/2 "2019-02-08T02:37:57Z")

</div>

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