How To Install NSQ?
Install NSQ by port mechanism:
# cd /usr/ports/net/nsq
# make install clean
Install NSQ by package manager:
# pkg install nsq
Create Local NSQ Cluster
The following commands run a small NSQ cluster on your local machine and send messages and archiving messages to disk.
in another shell, start nsqd:
# nsqd –lookupd-tcp-address=127.0.0.1:4160
in another shell, start nsqadmin:
# nsqadmin –lookupd-http-address=127.0.0.1:4161
publish an initial message (creates the topic in the cluster, too):
# curl -d ‘BSDMAG MSG 1’ ‘http://127.0.0.1:4151/pub?topic=bsdmag’
when you send a message to a topic for the first time, a topic will be created.
-d (HTTP) Sends the specified data in a POST request to the HTTP server, in the same way, that a browser does when a user has filled in an HTML form and presses the submit button.
finally, in another shell, start nsq_to_file:
# nsq_to_file –topic= bsdmag –output-dir=/tmp –lookupd-http-address=127.0.0.1:4161
nsq_to_file acts as a client and copy messages from memory to disk.
publish more messages to nsqd:
# curl -d ‘BSDMAG MSG 2’ ‘http://127.0.0.1:4151/pub?topic=bsdmag’
# curl -d ‘BSDMAG MSG 3’ ‘http://127.0.0.1:4151/pub?topic=bsdmag’
to verify things worked as expected, in a web browser open http://127.0.0.1:4171/ to view the nsqadmin UI and see statistics. Also, check the contents of the log files (test.*.log) written to /tmp.
The important lesson here is that nsq_to_file (the client) is not explicitly told where the test topic is produced, it retrieves this information from nsqlookupd and, despite the timing of the connection, no messages are lost.
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