The log file contains entries for various events, such as progress, information, error, and crash. Note that something flagged as error or crash does not necessarily mean that there is anything wrong. Below is an example of the output:

=PROGRESS REPORT==== 4-Mar-2010::11:54:23 ===
supervisor: {local,sasl_safe_sup}
started: [{pid,<0.32.0>},
{name,alarm_handler},
{mfa,{alarm_handler,start_link,[]}},
{restart_type,permanent},
{shutdown,2000},
{child_type,worker}]
=PROGRESS REPORT==== 4-Mar-2010::11:54:23 ===
supervisor: {local,sasl_safe_sup}
started: [{pid,<0.33.0>},
{name,overload},
{mfa,{overload,start_link,[]}},
{restart_type,permanent},
{shutdown,2000},
{child_type,worker}]

Look for ns_log in the output to see anything that would have been shown via the Couchbase Server Web Console.