How do I check the connectivity between:
(All of them are unix)
What string should I look for in logs?
Since they are all unix machines, can I check the connectivity using a command or any other way?
There are a few ways to check connectivity between these elements.
Search Head to Indexer:
Telnet on port 8089 between the SH <> IDX
You can also check the Search Peer status from the Search Head by navigating to Settings > Distributed Search > Search Peers. It will depict the IDX statuses.
Forwarder to Indexer:
Telnet from fwd to IDX on port 9997 (or whatever forward port you set in outputs.conf)
From the forwarder you can also grep $SPLUNK_HOME/var/log/splunk/splunkd.log for TcpOutputProc ( tail -100 splunkd.log | grep TcpOutputProcto check if you are connecting to the indexers
tail -100 splunkd.log | grep TcpOutputProc
From the indexer perspective you can search index=_internal sourcetype=splunkd tcpin_connectionsand confirm you see your forwarder
index=_internal sourcetype=splunkd tcpin_connections
DS to Deployment Client:
Telnet on port 8089 from DS to Client and vice versa.
Check _internal logs for index=_internal sourcetype=splunkd deploymentClient to confirm phone home.
index=_internal sourcetype=splunkd deploymentClient
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