Logs not being pushed to Logstash

Hi ,

I have setup ELK following below link.

My services are up including Kibana. However the logs from containers are not being pushed and not displayed in Kibana.
I have a Logspout container as well.

While creating containers, I am using this option

logdriver=syslog
Log Options
syslog-address=udp://LogStashIP:Port

Can anyone please let me know where am I going wrong.

Thanks,
Vishnu