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CHAPTER 5: Reviewing Logs and Monitoring
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What gets logged can be determined by the application or by the operating system. This differs for each program, and what gets logged can be configured manually. The act of escalating your privileges is typically logged, as are failed attempts to do so. Many items are logged for the purposes of troubleshooting, but when it comes to security, any item that elevates privileges, references a password entry, or indicates the occurrence of an application failure should be logged. A log entry can be as simple as one line indicating the deletion of a file, or as detailed as each file created during an installation or process. The following shows a portion of the output of the install.log file during the installation of the Mac OS X Server Admin tools. The install log shows each file created during the process as well as the corresponding date, time, and system on which each was created (or touched).
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Oct 23 14:03:03 Gene-Sullivans-MacBook installd[137]: PackageKit: Registered bundle file://localhost/Applications/Server/Xgrid%20Admin.app/ Oct 23 14:03:03 Gene-Sullivans-MacBook installd[137]: PackageKit: Registered bundle file://localhost/System/Library/CoreServices/Server%20Assistant.app/ Oct 23 14:03:03 Gene-Sullivans-MacBook installd[137]: PackageKit: Registered bundle file://localhost/Applications/Server/Server%20Monitor.app/ Oct 23 14:03:03 Gene-Sullivans-MacBook installd[137]: PackageKit: Registered bundle file://localhost/Applications/Server/Server%20Admin.app/ Oct 23 14:03:03 Gene-Sullivans-MacBook installd[137]: PackageKit: Registered bundle file://localhost/Applications/Server/Workgroup%20Manager.app/ Oct 23 14:03:03 Gene-Sullivans-MacBook installd[137]: PackageKit: Registered bundle file://localhost/Applications/Server/Server%20Admin.app/Contents/Resources/ ServerAdminLauncher.app/ Oct 23 14:03:03 Gene-Sullivans-MacBook installd[137]: PackageKit: Registered bundle file://localhost/Applications/Server/iCal%20Server%20Utility.app/ Oct 23 14:03:03 Gene-Sullivans-MacBook installd[137]: PackageKit: Registered bundle file://localhost/Applications/Server/System%20Image%20Utility.app/ Oct 23 14:03:03 Gene-Sullivans-MacBook installd[137]: PackageKit: Registered bundle file://localhost/Applications/Server/Server%20Preferences.app/Contents/Resources/ ServerPrefsLauncher.app/ Oct 23 14:03:03 Gene-Sullivans-MacBook installd[137]: PackageKit: Registered bundle file://localhost/Applications/Server/Server%20Preferences.app/ Oct 23 14:03:03 Gene-Sullivans-MacBook installd[137]: PackageKit: Registered bundle file://localhost/Applications/Server/Podcast%20Composer.app/ Oct 23 14:03:03 Gene-Sullivans-MacBook installd[137]: PackageKit: Registered bundle file://localhost/Applications/Server/System%20Image%20Utility.app/Contents/ Library/Automator/Create%20Image.action/Contents/MacOS/AutoPartition.app/ Oct 23 14:03:03 Gene-Sullivans-MacBook installd[137]: PackageKit: Registered bundle file://localhost/Applications/QuickTime%20Broadcaster.app/ Oct 23 14:03:04 Gene-Sullivans-MacBook installd[137]: Installed "Server Administration Software" () Oct 23 14:03:04 Gene-Sullivans-MacBook installd[137]: PackageKit: ----- End install ----Oct 23 14:03:05 Gene-Sullivans-MacBook Installer[127]: Running install actions Oct 23 14:03:05 Gene-Sullivans-MacBook Installer[127]: Removing temporary directory "/var/folders/cm/cmSii-8XGFiRvFh+UL8r3U+++TI/-Tmp-//Install.127IGw3rb" Oct 23 14:03:05 Gene-Sullivans-MacBook Installer[127]: Finalize disk "Snow Leopard" Oct 23 14:03:05 Gene-Sullivans-MacBook Installer[127]: Notifying system of updated components
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CHAPTER 5: Reviewing Logs and Monitoring
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Multiple processes can be logged simultaneously, because they use such little processing power. Logging software writes entries to log files while you re performing many of the common tasks you do every day and when routine tasks are running on your system in the background. This may be some of those pesky items that cause the computer to run slowly at various times of the day, such as right around 3:15 AM (this is when the normal daily periodic Unix scripts run). When looking at logs, try to keep in mind that reading every single line of every log file can become tedious. Rather than doing this, look for strange entries in the files. For example, if the previous log also had included a line that indicated the installation of something called keystrokelogger, that would be something to be concerned about.
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Trying to find and read all the system logs on a Mac used to be a daunting endeavor. With OS X, Apple has simplified this a bit by giving you a handy tool in the /Applications/Utilities folder called Console. In this section we ll cover how to use Console to view and mark logs.
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Viewing Logs
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You can use Console to review logs quickly without having to open and read each file independently. When you open Console, you are immediately viewing Console Messages. Clicking the Show Log List button gives you a listing of all the logs that Console is aware of, divided into three sections (see Figure 5 1). The Files section is a list of plain text log files, laid out according to where they re located in the file system. Any other log files you open for viewing with Console will appear in this section. The top two sections don t show the contents of text files, but rather information drawn from the Apple System Logger database. ASL is a new logging facility that Apple introduced with Leopard, which consists of syslogd and aslmanager. The de facto standard for logging messages on Unix system is syslogd. It is historically used by the kernel to write messages to the system log, and is also used by daemons and programs such as Apache and Postfix. In Snow Leopard, messages logged by the syslogd server are stored in a binary database, located in /private/var/log/asl/. The files in that directory are managed by aslmanager. For compatibility with the many other systems that use syslogd, many of the messages are elso echoed to /private/var/log/system.log.
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