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Each command sent to Nagios is prefixed with its service name, so each service may use any name for its subcommands.Nagios uses the query handlers internally to distribute jobs to worker processes.There are several built-in services, and the ones that are public are described throughout this chapter.The future versions of Nagios (or third-party software) may provide additional services.Unix domain sockets use filesystems as names for remote addresses.For example, /var/nagios/rw/is the path to the query handler's Unix domain socket for an installation performed according to the steps given in .The format of the response varies by the service that implements it.Many commands return an answer or send notifications after it is invoked.

Nagios may also send information—responses to commands or notifications.Filesystem permissions are used to determine whether a process can connect to the other side—so it is possible to limit the access to the query handler to specific operating system users or groups.Unix domain sockets are very similar to named pipes, such as the Nagios external commands pipe; however, it is not possible to use named pipes for a two-way communication with more than one client.The core service allows the querying of information about Nagios processes and scheduled jobs.The nerd service allows you to subscribe to events and can be used to receive real-time updates about changes on the Nagios host and/or service status.The last chapter talked about the extension of Nagios using multiple approaches, including writing your own plugins or commands to send notifications, and performing passive checks and sending the results to Nagios.

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