# Error, cannot retrieve cgroups information undefined method \`\[\]' for nil:NilClass

**URL:** <https://discuss.elastic.co/t/error-cannot-retrieve-cgroups-information-undefined-method-for-nil-nilclass/144675>\
**Category:** Logstash\
**Created:** [August 16, 2018, 9:36am UTC](https://discuss.elastic.co/t/error-cannot-retrieve-cgroups-information-undefined-method-for-nil-nilclass/144675 "2018-08-16T09:36:30Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![ypkkhatri](https://avatars.discourse-cdn.com/v4/letter/y/58f4c7/32.png) [@ypkkhatri](https://discuss.elastic.co/u/ypkkhatri)\
**Post date:** [August 16, 2018, 9:36am UTC](https://discuss.elastic.co/t/error-cannot-retrieve-cgroups-information-undefined-method-for-nil-nilclass/144675/1 "2018-08-16T09:36:31Z")

</div>

Hi,

I'm using logstash to import csv to elasticsearch with specific config file using this command `logstash-6.3.2/bin/logstash -f my_logstash.config --debug` but throwing below error:

```
[2018-08-16T11:20:05,083][DEBUG][logstash.instrument.periodicpoller.cgroup] Error, cannot retrieve cgroups information {:exception=>"NoMethodError", :message=>"undefined method `[]' for nil:NilClass"}
[2018-08-16T11:20:05,228][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ParNew"}
[2018-08-16T11:20:05,231][DEBUG][logstash.instrument.periodicpoller.jvm] collector name {:name=>"ConcurrentMarkSweep"}
[2018-08-16T11:20:06,259][DEBUG][logstash.pipeline] Pushing flush onto pipeline {:pipeline_id=>"main", :thread=>"#<Thread:0x262044dd sleep>"}

```

My logstash config file:

```
input {
    file {
        path => "/home/testuser/data/my-data.csv"
        start_position => "beginning"
        sincedb_path => "/dev/null"
    }
}
filter {
    csv {
        separator => ","
        columns => ["id","created","status"]
    }
    if ([id] == "id") {
        drop {}
    }
    uuid {
        target => "id"
        overwrite => true
    }
    if [status] == "NULL" {
        mutate {remove_field => ["status"]}
    } else {
        mutate {convert => ["status", "integer"]}
    }
    if [created] == "NULL" {
        mutate {remove_field => ["created"]}
    } else {
        date {
            locale => "de"
            match => ["created", "yyyy-MM-dd HH:mm:ss"]
            target => "created"
            timezone => "Europe/Berlin"
        }
    }
}

output {
    elasticsearch {
        hosts => "http://localhost:9200"
        index => "my_index"
        document_type => "doc"
    }
    stdout {}
}

```

That index `my_index` is already exists.

Please help, I'm using Ubuntu 18.04 LTS

Thank you

---

<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:** [September 13, 2018, 9:36am UTC](https://discuss.elastic.co/t/error-cannot-retrieve-cgroups-information-undefined-method-for-nil-nilclass/144675/2 "2018-09-13T09:36:31Z")

</div>

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