Logstash plugin installed but not found

Question

I am using logstash 2.3.2 and for one of my project I have to save some data in RAM. I asked a question on stackoverflow (Logstash: is it possible to save documents in memory?) to get a filter for that and the most appropriate filter is memcached (even if this one is unofficial).

I downloaded the plugin, I generated the gem file (which is not empty) and I successfully installed the plugin.

However, when i run logsatsh by using this filter in my configuration file, I get the following error:

:reason=>"Couldn't find any filter plugin named 'memcached'. Are you sure this is correct? Trying to load the memcached filter plugin resulted in this error: no such file to load -- logstash/filters/memcached", :level=>:error}

Moreover, when i use the command bin/logstah-plugin list,the filter memcached is not present.

I don't understand why it is happening. I followed this discussion (https://discuss.elastic.co/t/logstash-plugin-installed-but-not-found/24369) but without success !

So, do you know how I can solve this problem ?

Thank you for your attention and your help.

Joe

Answer 1

This is the process to follow:

A. In logstash-filter-cache-memcached.gemspec modify this line

s.add_runtime_dependency 'logstash-core', '>= 1.4.0', '< 2.0.0'

to

s.add_runtime_dependency 'logstash-core', '>= 1.4.0', '< 3.0.0'

B. Run the following command to build your plugin

> gem build logstash-filter-cache-memcached.gemspec  

C. In your logstash folder, install the plugin:

> bin/logstash-plugin install /path/to/logstash-filter-cache-memcached/logstash-filter-cache-memcached-0.1.1.gem 

That should yield this:

Validating /path/to/logstash-filter-cache-memcached/logstash-filter-cache-memcached-0.1.1.gem
Installing logstash-filter-cache-memcached
Installation successful

D. Verify your plugin is correctly installed

> bin/logstash-plugin list | grep cache
logstash-filter-cache-memcached

E. Run a quick test to see if that works:

> bin/logstash -t -e 'input{stdin{}} filter {memcached{namespace => "test" host => "localhost:11211" key => "test" field => "message" ttl=>60}} output {stdout{}}'

You should see this:

memcached plugin doesn't have a version. This plugin isn't well
 supported by the community and likely has no maintainer. {:level=>:warn}
Configuration OK