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Called regularly by cron, sadc does the monitoring and stores its measurements to files in the /var/log/sa/ folder. The sar client can be used to explore this data. System Activity Report ( sar ) is a Unix System V -derived system monitor command used to report on various system loads, including CPU activity, memory/paging, interrupts, device ...
inotify (inode notify) is a Linux kernel subsystem created by John McCutchan, which monitors changes to the filesystem, and reports those changes to applications.It can be used to automatically update directory views, reload configuration files, log changes, backup, synchronize, and upload.
This is particularly useful for monitoring log files. Ancient versions of tail poll the file every second by default but tail from the GNU coreutils as of version 7.5 support the inotify infrastructure introduced in Linux kernel version 2.6.13 in August 2005 which only check the file when is notified of changes by the kernel.
To display and monitor the collected logs one needs to use a client application or access the log file directly on the system. The basic command line tools are tail and grep. The log servers can be configured to send the logs over the network (in addition to the local files).
Open Source Tripwire is a free software security and data integrity tool for monitoring and alerting on specific file change(s) on a range of systems [2] [3] originally developed by Eugene H. Spafford and Gene Kim. [4]
NXLog Manager: Managing and monitoring a large number of log collector agents can be tough, especially if you have a lot of servers in different roles with multiple teams in charge. NXLog Manager can remotely manage and monitor NXLog Enterprise Edition instances using a centralized web based management console.
Log monitors are a type of software that monitor log files. [1] Servers, application, network and security devices generate log files. Errors, problems, and more information is constantly logged and saved for later log analysis. In order to detect problems automatically, system administrators and operations set up monitors on the generated logs ...
nmon (Nigel's Monitor [2]) is a computer performance system monitor tool for the AIX and Linux operating systems. [3] [4] The nmon tool has two modes a) displays the performance stats on-screen in a condensed format or b) the same stats are saved to a comma-separated values (CSV) data file for later graphing and analysis to aid the understanding of computer resource use, tuning options and ...