Multiple logstash instances don't work

I have multiple technologies running on a single PC like Hadoop, HBase and all. So I have written that many config files. The way I deploy them is by running a for loop over all the configs and deploying them one by one in a separate logstash instance in a thread. These configs output ERROR events to riemann:

for(all configs)
(bin/logstash -f config &)

But this way not a single config works. So I ran a single losgatsh instance on a single config and it worked. Can you please tell me why multiple logstash instances on a single PC are not working?

You might ask the same question as the bellow thread, visit the following thread, it may be helpful :slightly_smiling: