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You can use lesser permissions on your external command file directory than the default settings. Examine and test the lesser permissions I ve described in this chapter. Use your web server s authentication mechanism to secure your web console. If you use Apache then you should consider the use of Digest authentication to provide enhanced authentication to the Nagios CGIs. Remember there are caveats to using Digest authentication that you can read about in the Digest Authentication sidebar in this chapter. Consider whether you also want to add authentication to the Nagios HTML files as well as the CGI programs. Consider adding SSL to secure your web console traffic. Consider using CGIWrap and/or suEXEC to further secure your CGI scripts. Be aware that CGIWrap can be complicated and time consuming to install and configure and that suEXEC is generally only effective if you are using virtual hosts. Avoid the use of default users in your Nagios CGI configuration. Default users allow unauthenticated users to access your web console. Instead, ensure each of your users is defined and authenticated individually. Only grant the authorization that each of your users requires to the Nagios web console. Remember that users who are configured in your web server authentication and who are also contacts for your hosts and services are authenticated contacts. Authenticated contacts have access to those hosts and services they are contacts for. Additional privileges and access should be limited to only those users who require it. Make sure the log_file directive is the first directive in your nagios.cfg file to ensure Nagios knows where to log any potential errors.

SELinux: www.nsa.gov/selinux/ Openwall: www.openwall.org Bastille: www.bastille-linux.org/ Tripwire: www.sourceforge.net/projects/tripwire/ CGIWrap: http://cgiwrap.unixtools.org/ suEXEC: http://httpd.apache.org/docs/suexec.html HOWTO Apache authorization: http://httpd.apache.org/docs/howto/auth.html HOWTO Apache .htaccess files: http://httpd.apache.org/docs/howto/htaccess.html Nagios cgi.cfg configuration file directives: http://nagios.sourceforge.net/docs/2_0/ configcgi.html Nagios CGI authentication and authorization: http://nagios.sourceforge.net/docs/ 2_0/cgiauth.html Syslog-NG: www.balabit.com/products/syslog_ng/

Listing 2-2. Basic Inheritance in JavaScript var EmailMessage = function(subject) { this.subject = subject; this.send = function() { alert("Message '" + this.subject + "' sent!"); } } // Create a new, empty class var EventInvitation = function() {}; // Inherit properties and methods from the EmailMessage class EventInvitation.prototype = new EmailMessage(); // EventInvitation thinks it is the EmailMessage class, so correct this... EventInvitation.prototype.constructor = EventInvitation; // Define the subject for all instances of the EventInvitation class EventInvitation.prototype.subject = "You are cordially invited to..."; // Create an instance of the EventInvitation class var myEventInvitation = new EventInvitation(); // Outputs "Message 'You are cordially invited to...' sent!" myEventInvitation.send();

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Single repeating float time value. Cycle time provided in <optional>. Cosine of time_0_x. Sine of time_0_x. Tangent of time_0_x. 4-vector of time0_x, sintime0_x, costime0_x, tantime0_x.

he Nagios web console is an optional component of the Nagios monitoring tool You don t need to use the web console unless you wish to see a visual representation of your hosts and services and to interact with them through this console Many organizations use the Nagios web console as one of the displays in their network operations center (NOC) or on a projected console to display the current status of your hosts and services If you simply want to use the Nagios server for monitoring and notifications, you do not need to configure the web console (which means you can skip the Configuring Your Web Server for Nagios section in 1).

When using inheritance to create variations or specializations of existing classes, all the properties and methods of the parent class are available to the child. You do not need to declare or define anything extra within the child class to be able to use properties and methods of the parent. This is termed encapsulation. The child class needs to contain definitions only for the properties and methods that are in addition to those of the parent.

Personally, I recommend that you configure the web console (and secure it using the information in 3) as it provides not only a good interface to the hosts and services being monitored but also an easy mechanism to perform actions on the Nagios server, such as enabling and disabling active checking and notifications There are a few issues with the web console, though The first is that the CGIs are written in C and thus can be slow This is especially true if you have a large number of hosts and services The second issue is that Ethan Galstad, the developer of Nagios, has indicated that version 30 will likely remove the web console functionality from the server package and replace it with a separate package.

time0_x scaled to [0..1]. costime0_x scaled to [0..1]. sintime0_x scaled to [0..1]. tantime0_x scaled to [0..1]. time0_x_packed scaled to [0..1]. time0_x scaled to [0..2_]. costime0_x scaled to [0..2_]. sintime0_x scaled to [0..2_]. tantime0_x scaled to [0..2_]. time0_x_packed scaled to [0..2_].

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