# How to use dictionary with multidimensional array in Logstash?

**URL:** <https://discuss.elastic.co/t/how-to-use-dictionary-with-multidimensional-array-in-logstash/52585>\
**Category:** Logstash\
**Created:** [June 13, 2016, 9:39am UTC](https://discuss.elastic.co/t/how-to-use-dictionary-with-multidimensional-array-in-logstash/52585 "2016-06-13T09:39:57Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![solidz](https://avatars.discourse-cdn.com/v4/letter/s/bbe5ce/32.png) [@solidz](https://discuss.elastic.co/u/solidz)\
**Post date:** [June 13, 2016, 9:39am UTC](https://discuss.elastic.co/t/how-to-use-dictionary-with-multidimensional-array-in-logstash/52585/1 "2016-06-13T09:39:57Z")

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Hi,

I realize a project to collect NetFlow metric on Cisco router with Logstash.

With the NetFlow protocol, I collect host address, and only the OID of interfaces (like "1") and not names interfaces (like "Gi8" for example).

I would like to match host IP to convert the OID of interfaces to names interfaces, with use a dictionary file (interfaces.yaml) like this :

**"HOST": "OID interface:Name interface"**

"172.16.1.1": "1:Gi8"  
"172.16.1.1": "2:Gi9"  
"172.16.1.1": "3:Gi0"  
"172.16.1.1": "4:Gi1"  
"172.16.1.1": "5:Gi2"  
"172.16.1.1": "6:Gi3"  
"172.16.1.1": "7:Gi4"  
"172.16.1.1": "8:Gi5"  
"172.16.1.1": "9:Gi6"  
"172.16.1.1": "10:Gi7"

**And my logstash configuration is :**

```
input {
    udp {
        port => 9995
        type => netflow
        codec => netflow {
            definitions => "/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-codec-netflow-master/lib/logstash/codecs/netflow/netflow.yaml"
            versions => [9]           
        }
    }
}
filter {
    translate {
        dictionary_path => "/etc/logstash/yaml/interfaces.yaml" #It's the dictionary file
        field => "[host]" #[host] is the host address field
        destination => "array_input_interface"
        fallback => "unknown:unknown"
}
    mutate{
        split => ["array_input_interface" , ":"]
        add_field => ["[netflow][input_interface]", "%{[array_input_interface][1]}" ] #[input_interface] is the field desired
        remove_field => ["array_input_interface"]
    }
}
output {
    stdout { codec => rubydebug }
    file {
        path => "/var/log/logstash/test" #I check metrics format with this file
    }
    elasticsearch {
        index => "logstash_netflow9-%{+YYYY.MM.dd}"
        hosts => "127.0.0.1" #I export metrics in elasticsearch
    }
}

```

The problem is that only the last interface is always chosen : " **Gi7**" even if OID is **different of 10**. The match doesn't work and I don't know why..

Any idea ?

Thanks for help.

PS : I'm sorry for my language, but I have some difficulties with english language. I can to explain with more details if it's not clear

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<div class="post-metadata">

**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\
**Post date:** [June 14, 2016, 3:44am UTC](https://discuss.elastic.co/t/how-to-use-dictionary-with-multidimensional-array-in-logstash/52585/2 "2016-06-14T03:44:37Z")

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Does it work if you remove the quotes around the second value? As per [https://www.elastic.co/guide/en/logstash/current/plugins-filters-translate.html#plugins-filters-translate-dictionary\_path](https://www.elastic.co/guide/en/logstash/current/plugins-filters-translate.html#plugins-filters-translate-dictionary_path)

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<div class="post-metadata">

**Author:** ![solidz](https://avatars.discourse-cdn.com/v4/letter/s/bbe5ce/32.png) [@solidz](https://discuss.elastic.co/u/solidz)\
**Post date:** [June 14, 2016, 11:34am UTC](https://discuss.elastic.co/t/how-to-use-dictionary-with-multidimensional-array-in-logstash/52585/3 "2016-06-14T11:34:36Z")

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Doesn't work when I remove the quotes.

I found the solution. This is my new dictionnary : **"HOST@OID\_interface": "Name interface"**

I create a new configuration for logstash :

```
mutate {
    add_field => { "key_input_snmp" => "%{host}@%{[netflow][input_snmp]}" }
}

translate {
    dictionary_path => "/etc/logstash/yaml/interfaces.yaml"
    field => "key_input_snmp"
    destination => "tmp_input_interface"
    fallback => "unknown"
}

mutate {
    add_field => ["[netflow][input_interface]","%{[tmp_input_interface]}"]
}

```

It works !  
Problem solved.

Thanks.

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<div class="post-metadata">

**Author:** ![pereyrdi](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/pereyrdi/32/12480_2.png) [@pereyrdi](https://discuss.elastic.co/u/pereyrdi)\
**Post date:** [April 4, 2017, 3:19pm UTC](https://discuss.elastic.co/t/how-to-use-dictionary-with-multidimensional-array-in-logstash/52585/4 "2017-04-04T15:19:28Z")

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Thanks, could please share an example of interfaces.yaml

diego

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<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:** [July 6, 2017, 4:27am UTC](https://discuss.elastic.co/t/how-to-use-dictionary-with-multidimensional-array-in-logstash/52585/5 "2017-07-06T04:27:20Z")

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