Logstash kubernetes container crashing

Any tips? It starts and goes into a crash loopback, very little info shown

The most I can get from a kubectl logs is:
{:timestamp=>"2016-08-18T12:46:14.936000+0000", :message=>"Pipeline main started"}
{:timestamp=>"2016-08-18T12:46:15.041000+0000", :message=>"Pipeline main has been shutdown"}
{:timestamp=>"2016-08-18T12:46:17.938000+0000", :message=>"stopping pipeline", :id=>"main"}

In a regular terminal window, nav to a/the logstash install folder.
bin/logstash --help
note the options for
-- debug
--log FILE

Try both command line options. log to a file you can access.
A lot of lines will be logged but in there somewhere there will be a clue.
Post the contents here or create an attachment - be sure to scrub any sensitive proprietary data.

Thanks Guy, log stash is installed in the container, the container crashes so I can't get exec -it to a bash on it when its crashing to get to the log stash install folder.