Lab 1.2 - Troubleshooting, Logs, etc

Understand the iControl & iControl LX Logs

In Lab 1.1 we explored the two key daemons responsible for iControl REST and iControl LX Extensions. The two logs for these daemons are:

/var/log/restjavad.0.log

/var/log/restnoded/restnoded.log

It is important to be familiar with both of these logs while developing iControl LX Extensions. You will get to know restnoded.log very well!

Task 1 - Streaming the log output

You can open these logs with any text editor/reader. However, it is far more efficient to stream the output while operations such as starting the restnoded daemon are taking place.

Perform the following steps to complete this task:

1. To ‘stream’ the output of restnoded, use the tail command. For example:

   tail -f /var/log/restnoded/restnoded.log

2. Log output will now be printed as soon as it occurs. To stop the output and return to a shell type Ctrl+c.

Task 2 - Combining Commands, for Extra Efficiency

To ensure you don’t miss any output while your iControl LX Extension is loading, you can execute the restnoded restart command, and the tail commands together using the separator ;.

For example:

bigstart restart restnoded; tail -f /var/log/restnoded/restnoded.log

Note

The ; means to execute the first command, bigstart restart restnoded, and then the second command, tail -f /var/log/restnoded/restnoded.log immediately after.