SLB
	Simple Load Balancer	Sergey Poznyakoff

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3.3 Daemon Configuration

The most important daemon parameters are the operation mode and wakeup interval. You are not required to explicitly configure them, but you may want to do so, if their default values don't suit you.

There are two operation modes: ‘standalone’ and ‘cron’. In standalone mode, slb detaches itself from the controlling terminal and continues operation in the background, as a daemon. It will periodically wake up, poll the servers, compute load table and format it to the output file or pipe. This is the default operation mode.

In cron mode, slb starts, polls the servers, computes and formats load table and exits when done. This mode is designed for use from crontabs, hence its name. It has some limitation, compared to the standalone mode. Most notably, the d() function (derivative) is not available in this mode.

If you wish to explicitly set the operation mode, use the ‘standalone’ configuration statement. The statement:

standalone yes;

configures the standalone mode, whereas the statement:

standalone no;

configures cron mode. The later can also be requested from the command line, using the ‘--cron’ option.

When operating in standalone mode, the wakeup interval specifies the amount of time, in seconds, between successive polls. The default value is 5 minutes. To set another value, use the ‘wakeup’ statement. For example, the following configures slb to do a poll each minute:

wakeup 60;