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Cerebro is a collection of cluster monitoring tools and libraries.
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Cerebro is a collection of cluster monitoring tools and libraries. This project has been named after a part of the central nervous system to pay homage to the the Ganglia project (http://ganglia.sourceforge.net). A heavily modified version of Ganglia was once used at Lawrence Livermore National Laboratory, but as needs and demands changed, it became necessary to develop a slightly different tool. Several of goals of Cerebro were to develop a monitoring tool that: - Interrupt the CPU less frequently (fixed in newer Ganglias). - Provide the user with a set of libraries, command-line tools, and a dynamic module interface that allow users to monitor new metrics without any re-compilation or configuration changes. - Provide a dynamic module interface that allows individual clusters to monitor different metrics based solely on the modules installed. - Provide a dynamic module interface which allows the libraries and tools to have knowledge of every node in the cluster. - Provide a dynamic module interface which allows the libraries and tools to automatically configure itself across a cluster. - Define what nodes exist within a cluster. - Remove XML overhead. At this point in time, the Cerebro project should not be mistaken for a full host monitoring system like Ganglia or Supermon, although it one day may be. Future development goals include: - Security/access control features - Confined listening configuration. In order to install Cerebro, only the primary RPM (cerebro) need be installed. However, additional features of Cerebro can be taken advantage of by installing a clusterlist module (cerebro-clusterlist) which allows Cerebro to recognize the hosts in the current cluster. The current clusterlist database formats supported are: Genders - Uses a genders database and the genders library to determine all nodes in the cluster. (http://sourceforge.net/projects/genders) Hostsfile - Uses a file that lists the hostname of every node in the cluster on a separate line. In addition, other modules can be installed for cluster configuration (cerebro-config), metric monitoring (cerebro-metric), or metric logging (cerebro-monitor). The following metric modules are currently publicly distributed: boottime - Monitor cluster node boottimes. shutdown - Monitor when nodes are shutdown gracefully bytesin, bytesout, packetsin, packetsout, rxerrs, txerrs - Monitor network usage memtotal, memused, memfree, swaptotal, swapused, swapfree - Monitor memory usage loadavg1, loadavg5, loadavg15 - Monitor load Albert Chu chu11@llnl.gov Lawrence Livermore National Laboratories
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