Updated example

Author: Oleksii Tsvietnov

examples/service-discovery/README.md

@@ -17,8 +17,31 @@ docker build -t trc-test-sd .
 
 ## Test
 
-Press `<Ctrl+C>` to exit 
+To test this example you need an IP of a working ZooKeeper cluster.
+The 'virtual app' can be interrupted by pressing `<Ctrl+C>`.
+
+The command line will look like
+
+```bash
+$ docker run --rm -it -e ZKURL="srv1[:port1][,srv2[:port2]...]" trc-test-sd
+```
+For example:
 
 ```bash
-$ docker run --rm -it -e RC_VERBOSE=true -e ZKURL="srv1[:port1][,srv2[:port2]...]" trc-test-sd
+$ docker run --rm -it -e ZKURL=192.168.1.173 trc-test-sd 2017-03-03 16:49:06 trc [main/1]: The wait policy: wait_any
+2017-03-03 16:49:06 trc [main/1]: Launching on the boot: /etc/trc.d/boot.sd-reg
+2017-03-03 16:49:06 trc [main/1]: 2a3556e6f646 has been registered at 192.168.1.173
+2017-03-03 16:49:06 trc [sync/29]: Launching on the foreground: /etc/trc.d/sync.app
+I am alive! Press <Ctrl+C> to exit...
+I am alive! Press <Ctrl+C> to exit...
+I am alive! Press <Ctrl+C> to exit...
+^C2017-03-03 16:49:08 trc [sync/29]: Exiting on the foreground (exitcode=130): /etc/trc.d/sync.app
+2017-03-03 16:49:09 trc [main/1]: Trying to terminate sub-processes...
+2017-03-03 16:49:09 trc [halt/44]: Running the shutdown script: /etc/trc.d/halt.sd-unreg
+2017-03-03 16:49:09 trc [halt/44]: 2a3556e6f646 has been unregistered at 192.168.1.173
+2017-03-03 16:49:09 trc [main/1]: Exiting from the shutdown script (exitcode=0): /etc/trc.d/halt.sd-unreg
+2017-03-03 16:49:09 trc [main/1]: Exited.
+
+$ echo $?
+0
 ```

examples/service-discovery/trc.d/halt.sd-unreg

@@ -7,5 +7,5 @@ then
     log "$(hostname) has been unregistered at ${ZKURL}"
 fi
 
-# finish with 0 exit status
+# Ignoring exit status 130 (after pressing Ctrl+C) by finishing with status 0
 exit 0