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collectd - System information collection daemon ================================================= http://collectd.org/ About ----- collectd is a small daemon which collects statistics about a computer's usage and writes then into RRD files. Features -------- * collectd is able to collect the following data: - apache Apache server utilization: Number of bytes transfered, number of requests handled and detailed scoreboard statistics - apcups APC UPS Daemon: UPS charge, load, input/output/battery voltage, etc. - apple_sensors Sensors in Macs running Mac OS X / Darwin: Temperature, fanspeed and voltage sensors. - battery Batterycharge, -current and voltage of ACPI and PMU based laptop batteries. - cpu CPU utilization: Time spent in the system, user, nice, idle, and related states. - cpufreq CPU frequency (For laptops with speed step or a similar technology) - df Mountpoint usage (Basically the values `df(1)' delivers) - disk Disk utilization: Sectors read/written, number of read/write actions, average time an IO-operation took to complete. - dns DNS traffic: Query types, response codes, opcodes and traffic/octets transfered. - email Email statistics: Count, traffic, spam scores and checks. See collectd-email(5). - entropy Amount of entropy available to the system. - exec Values gathered by a custom program or script. See collectd-exec(5). - hddtemp Harddisk temperatures using hddtempd. - interface Interface traffic: Number of octets, packets and errors for each interface. - iptables Iptables' counters: Number of bytes that were matched by a certain iptables rule. - irq IRQ counters: Frequency in which certain interrupts occur. - load System load average over the last 1, 5 and 15 minutes. - mbmon Motherboard sensors: temperature, fanspeed and voltage information, using mbmon(1). - memory Memory utilization: Memory occupied by running processes, page cache, buffer cache and free. - multimeter Information provided by serial multimeters, such as the `Metex M-4650CR'. - mysql MySQL server statistics: Commands issued, handlers triggered, thread usage, query cache utilization and traffic/octets sent and received. - network Receive values that were collected by other hosts. Large setups will want to collect the data on one dedicated machine, and this is the plugin of choice for that. - nfs NFS Procedures: Which NFS command were called how often. Only NFSv2 and NFSv3 right now. - ntp NTP daemon statistics: Local clock drift, offset to peers, etc. - nut Network UPS tools: UPS current, voltage, power, charge, utilisation, temperature, etc. See upsd(8). - perl The perl plugin implements a Perl-interpreter into collectd. You can write your own plugins in Perl and return arbitrary values using this API. See collectd-perl(5). This plugin is still considered to be experimental and subject to change between minor releases. - ping Network latency: Time to reach the default gateway or another given host. - processes Process counts: Number of running, sleeping, zombie, ... processes. - sensors System sensors, accessed using lm_sensors: Voltages, temperatures and fan rotation speeds. - serial RX and TX of serial interfaces. Linux only; needs root privileges. - swap Pages swapped out onto harddisk or whatever is called `swap' by the OS.. - tape Bytes and operations read and written on tape devices. Solaris only. - users Users currently logged in. - vserver System resources used by Linux VServers. See <http://linux-vserver.org/>. - wireless Link quality of wireless cards. Linux only. * Output can be written or send to various destinations by the following plugins: - csv Write to comma separated values (CSV) files. This needs lots of diskspace but is extremely portable and can be analysed with almost every program that can analyse anything. Even Microsoft's Excel.. - network Send the data to a remote host to save the data somehow. This is useful for large setups where the data should be saved by a dedicated machine. - perl Of course the values are propagated to plugins written in Perl, too, so you can easily do weird stuff with the plugins we didn't dare think of ;) See collectd-perl(5). - rrdtool Output to round-robin-database (RRD) files using librrd. See rrdtool(1). This is likely the most popular destination for such values. Since updates to RRD-files are somewhat expensive this plugin can cache updates to the files and write a bunch of updates at once, which lessens system load a lot. - unixsock One can query the values from the unixsock plugin whenever they're needed. Please read collectd-unixsock(5) for a description on how that's done. * Logging is, as everything in collectd, provided by plugins. The following plugins keep up informed about what's going on: - logfile Writes logmessages to a file or STDOUT/STDERR. - syslog Logs to the standard UNIX logging mechanism, syslog. * Performance: Since collectd is running as a daemon it doesn't spend much time starting up again and again. With the exception of the exec plugin no processes are forked. Caching in output plugins, such as the rrdtool and network plugins, makes sure your resources are used efficiently. Also, since collectd is programmed multithreaded it benefits from hyperthreading and multicore processors and makes sure that the daemon isn't idle if only one plugins waits for an IO-operation to complete. * Once set up, hardly any maintenance is necessary. Setup is kept as easy as possible and the default values should be okay for most users. Operation --------- * collectd's configuration file can be found at `sysconfdir'/collectd.conf. Run `collectd -h' for a list of builtin defaults. See `collectd.conf(5)' for a list of options and a syntax description. * When the `csv' or `rrdtool' plugins are loaded they'll write the values to files. The usual place for these files is beneath `/var/lib/collectd'. * When using some of the plugins, collectd needs to run as user root, since only root can do certain things, such as craft ICMP packages needed to ping other hosts. collectd should NOT be installed setuid root since it can be used to overwrite valuable files! * Sample scripts to generate graphs reside in `contrib/' in the source package or somewhere near `/usr/share/doc/collectd' in most distributions. Please be aware that those script are meant as a starting point for your own experiments.. Some of them require the `RRDs' Perl module. (`librrds-perl' on Debian) If you have written a more sophisticated solution please share it with us. * The RRAs of the automatically created RRD files depend on the `step' and `heartbeat' settings given. If change these settings you may need to re-create the files, losing all data. Please be aware of that when changing the values and read the rrdtool(1) manpage thoroughly. Prerequisites ------------- To compile collectd from source you will need: * Usual suspects: C compiler, linker, preprocessor, make, ... * A POSIX-threads (pthread) implementation. Since gathering some statistics is slow (network connections, slow devices, etc) the collectd is parallelized. The POSIX threads interface is being used and should be found in various implementations for hopefully all platforms. * libcurl (optional) If you want to use the `apache' plugin * libiptc (optional) For querying iptables counters. * libmysqlclient (optional) * liboping (optional, if not found a version shipped with this distribution can be used) Used by the `ping' plugin to send and receive ICMP packets. * libpcap (optional) Used to capture packets by the `dns' plugin. * librrd (optional; headers and library; rrdtool 1.0 and 1.2 both work fine) If built without `librrd' the resulting binary will be `client only', i.e. will send its values via multicast and not create any RRD files itself. Alternatively you can chose to write CSV-files (Comma Separated Values) instead. * libsensors (optional) To read from `lm_sensors'. * libstatgrab may be used to collect statistics on systems other than Linux and/or Solaris. Note that CPU- and disk-statistics, while being provided by this library, are not supported in collectd right now.. <http://www.i-scream.org/libstatgrab/> * libupsclient/nut (optional) For the `nut' plugin which queries nut's `upsd'. * librt, libsocket, libkstat, libdevinfo Various standard Solaris libraries which provide system functions. * CoreFoundation.framework and IOKit.framework For compiling on Darwin in general and the `apple_sensors' plugin in particular. Crosscompiling -------------- To compile correctly collectd needs to be able to initialize static variables to NAN (Not A Number). Some C libraries, especially the GNU libc, have a problem with that. Luckily, with GCC it's possible to work around that problem: One can define NAN as being (0.0 / 0.0) and `isnan' as `f != f'. However, to test this ``implementation'' the configure script needs to compile and run a short test program. Obviously running a test program when doing a cross- compilation is, well, challenging. If you run into this problem, you can use the `--with-nan-emulation' configure option to force the use of this implementation. We can't promise that the compiled binary actually behaves as it should, but since NANs are likely never passed to the libm you have a good chance to be lucky. Contact ------- For questions, bugreports, development information and basically all other concerns please send an email to collectd's mailinglist at <collectd at verplant.org>. For live discussion and more personal contact visit us in IRC, we're in channel #collectd on freenode. Author ------ Florian octo Forster <octo at verplant.org>, Sebastian tokkee Harl <sh at tokkee.org>, and many contributors (see `AUTHORS'). Please send bugreports and patches to the mailinglist, see `Contact' above.