cannot configure mongodb and logstash - mongodb

Question

Hi i am new logstash and as well as mongodb. I am not really sure if this is the right place to ask question or not, but i really need help. I have posted the same question in logstash-users google group as well, but i havent received and any answer. Further i have gone through all the posts at the google group but none of the solutions seem to be working.
i need to use mongodb for output so i ran the following command:
./plugin install contrib
After that i ran this command
./logstash agent --config logstash-shipper.conf
my logstash-shipper.conf is
input {
file {
path => "/var/log/alternatives.log"
type => "syslog"
}
}
output {
mongodb {
codec => "plain"
collection => "logstash"
database => "mydb"
generateId => true
isodate => true
uri => "mongodb://localhost:27017/"
} }
i get the error
Using milestone 2 input plugin 'file'. This plugin should be stable, but if you see strange behavior, please let us know! For more information on plugin milestones, see http://logstash.net/docs/1.4.0/plugin-milestones {:level=>:warn}
+---------------------------------------------------------+
| An unexpected error occurred. This is probably a bug. |
| You can find help with this problem in a few places: |
| |
| * chat: #logstash IRC channel on freenode irc. |
| IRC via the web: http://goo.gl/TI4Ro |
| * email: logstash-users#googlegroups.com |
| * bug system: https://logstash.jira.com/ |
| |
+---------------------------------------------------------+
The error reported is:
Couldn't find any output plugin named 'mongodb'. Are you sure this is correct? Trying to load the mongodb output plugin resulted in this error: no such file to load -- logstash/outputs/mongodb

Answer 1

As far as I can tell, the 1.4.2 distribution is slightly broken. The version name of the release is "1.4.2-modified" but the contrib version is still "1.4.2".
My workaround was to find ./lib/logstash/version.rb and change
LOGSTASH_VERSION = "1.4.2-modified"
to
LOGSTASH_VERSION = "1.4.2"
This allowed
./plugin install contrib
to work (i.e. my mongodb connection works now), and so far nothing else has broken. Interestingly enough, there's a note right in the version.rb file that says
# Note to authors: this should not include dashes because 'gem' barfs if
# you include a dash in the version string.
Oops.