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well-managed system needs to be continuously monitored for security, accounting, and performance purposes. Solaris 10 provides several built-in mechanisms for accounting for resource usage, which you can then further use with an automated billing procedure. This is very useful for Internet service providers and shared-use systems that must account for the resources utilized by users or groups. In addition, you can easily detect inappropriate usage of resources by unauthorized individuals, and you can limit utilization by enforcing quotas.
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The following sections examine how to enable system logging, monitoring, and accounting.
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syslog is a centralized logging facility that provides different classes of events that are logged to a logfile. syslog also provides an alerting service for certain events. Because syslogd is configurable by root, it is very flexible in its operations. Multiple logfiles can exist for each daemon whose activity is being logged, or a single logfile can be created. The syslog service is controlled by the configuration file /etc/syslog.conf, which is read at boot time, or whenever the syslog daemon receives a HUP signal. This file defines the facility levels or system source of logged messages and conditions. Priority levels are also assigned to system events recorded in the system log, while an action field defines what action is taken when a particular class of event is encountered. These events can range from normal system usage, such as FTP connections and remote shells, to system crashes. The source facilities defined by Solaris are for the kernel (kern), authentication (auth), daemons (daemon), mail system (mail), print spooling (lp), user processes (user), and many others. Priority levels are classified as system emergencies (emerg), errors requiring
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immediate attention (attn), critical errors (crit), messages (info), debugging output (debug), and other errors (err). These priority levels are defined for individual systems and architectures in <sys/syslog.h>. It is easy to see how logging applications, such as TCP wrappers, can take advantage of the different error levels and source facilities provided by syslogd. On the Solaris platform, the syslog daemon depends on the m4 macro processor being present. m4 is typically installed with the software developer packages and is usually located in /usr/ccs/bin/m4. This version has been installed by default since Solaris 2.4. Note that the syslogd supplied by Sun has been error-prone in previous releases. With early Solaris 2.x versions, the syslog daemon left behind zombie processes when alerting logged-in users (e.g., notifying root of an emerg). If syslogd does not work, check that m4 exists and is in the path for root, and/or run the syslogd program interactively by invoking it with a d parameter. m4 is discussed in detail in 27.
Quotas
Resource management is one of the key responsibilities of an administrator, particularly where the availability of a service is the organization s primary source of income (or recognition). For example, if an application server requires 10MB of free disk space for internal caching of objects retrieved from a database, performance on the client side will suffer if this space is not available (for example, because a user decided to dump his collection of MP3 music files onto the system hard drive). If external users cannot access a service because of internal resource allocation problems, they are unlikely to continue using your service. There is also a possibility that a rogue user (or competitor) may attempt to disrupt your service by attempting any number of well-known exploits to reduce your provision of service to clients. The Implementing Quotas section examines resource management strategies that are flexible enough to meet the needs of casual users yet restrictive enough to limit the potential for accidental or malicious resource misuse.
System Accounting
Solaris provides a centralized auditing service known as system accounting. This service is very useful for accounting for the various tasks that your system may be involved in you can use it to monitor resource usage, troubleshoot system failures, isolate bottlenecks in the system, and assist in system security. In addition, system accounting acts as a real accounting service, and you can use it for billing in the commercial world. The Collecting Accounting Data section reviews the major components of system accounting, including several applications and scripts that are responsible for preparing daily reports on connections, process, and disk loads, and usage statements for users. Once you enable the appropriate script in /etc/init.d, system accounting does not typically involve administrator intervention.
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