Simple test showing that logstash port is reachable by filebeat

[zoplex]

We are looking at larger number of filebeats installations in the production environments. One challenge is that in some cases logstash host:5044 is not reachable from the filebeat host. How do we check using curl (nc is not available) that filebeat will be able to talk to logstash? I tried in cases where that connectivity is working fine and curl -v will return 'connection refused'; in cases where it does not have connectivity it would hang - but is there a better way/more definitive? I need to tell users that are installing filebeat a definitive way so we do not even go with the install if the connectivity is not working (opening ports is separate task in a sense that we still need to figure out what exactly is needed to establish that connectivity).

Thanks

[PhaedrusTheGreek (Jay Greenberg)]

@zoplex,

If the telnet utility is available, that can easily be used to test for an open port.

$ telnet google.ca 443
Trying 172.217.3.131...
Connected to google.ca.
Escape character is '^]'.
Connection closed by foreign host. 

Let me know if that helps

[zoplex]

Yes - that works well - thanks!

[steffens (Steffen Siering)]

just for checking a tcp port being available I prefer netcat over telnet though (besides telnet client being available mostly on any system): $ nc -zv <host> <port>. Ncat is a modern netcat on steroids.

[zoplex]

Thank you - we do not have it installed on all VMs so I had to look for different approach - but thanks regardless.