svckit examples

Before running individual examples run in separate terminal following command:

./start

This will internally run goreman and launch all necessary services (NSQ services + consul) as defined in Procfile. Consul agent will be started with services defined in consul.json.

Following admin UIs will be then running on localhost:

• Consul UI: http://localhost:8500/
• NSQ Admin: http://localhost:4171/

NSQ example

In first terminal run:

go run nsq_sub.go

In second terminal run:

go run nsq_pub.go

Leadership example

Run the application in two terminals:

  go run leader_example.go

Stop the application which becomes the leader. The other one will take over. Start two apps again, find the PIDs:

ps aux | grep leader_example$

Send USR1 signal to current leader, e.g.:

kill -s USR1 70854

Second takes over the lead, first one is waiting. Send the signal to current leader,e .g.:

kill -s USR1 70862

Roles will switch again: First takes over the lead back, second one is waiting.

Http interface example

go run httpi_example.go

Then run:

http://localhost:8123/ping

Notice HTTP header Application in the response. Also try running following commands:

http://localhost:8123/health_check

 http://localhost:8123/debug/vars

http://localhost:8123/debug/pprof

Metrics example

Run:

go run metric_example.go

The metrics are written and sent to udp:8125 port. Here statsd_to_nsq is listening which writes them into NSQ channel. To see more run:

nsq_tail -topic=stats -lookupd-http-address=localhost:4161