The Slash Daemon and Tasks
As implied way back in Section 1.5 in Chapter 1, Slash relies on several external processes to do things outside the standard web publishing cycle. Some tasks need to happen at predetermined times (e.g., rotating logs and mailing out daily headline lists). Other jobs, such as doling out moderator points, take up time or memory that a mod_perl process cannot spare.
The venerable slashd daemon is the parent and guardian of
all tasks. For each unique site, it schedules and launches all tasks found in
tasks/ directory. Slash installs
slashd to launch as a system daemon at boot time, so it
should always be running when any Slash site is accessible. Each Slash site
has its own slashd process. The only difference between
these instances is that each will use the virtual user appropriate to its
As it runs, slashd writes copious information to the
slashd.log file beneath the associated site’s
logs/ directory. (The
slashd running for ghostwheel will
write its log to
a site appears to be “stuck,” check this log to make sure that the
daemon is running as expected. The
configuration variable controls the amount of logging.
slashd checks this variable regularly, so an administrator
can temporarily raise the debugging level and monitor the log if problems
arise. The available values are 0, 1, and 2.
At level 0, slashd will log errors and warnings, slashd startup ...