1 collectd - System information collection daemon
2 =================================================
3 http://collectd.org/
5 About
6 -----
8 collectd is a small daemon which collects system information periodically
9 and provides mechanisms to store and monitor the values in a variety of
10 ways.
13 Features
14 --------
16 * collectd is able to collect the following data:
18 - apache
19 Apache server utilization: Number of bytes transfered, number of
20 requests handled and detailed scoreboard statistics
22 - apcups
23 APC UPS Daemon: UPS charge, load, input/output/battery voltage, etc.
25 - apple_sensors
26 Sensors in Macs running Mac OS X / Darwin: Temperature, fanspeed and
27 voltage sensors.
29 - aquaero
30 Various sensors in the Aquaero 5 watercooling board made by Aquacomputer.
32 - ascent
33 Statistics about Ascent, a free server for the game `World of Warcraft'.
35 - battery
36 Batterycharge, -current and voltage of ACPI and PMU based laptop
37 batteries.
39 - bind
40 Name server and resolver statistics from the `statistics-channel'
41 interface of BIND 9.5, 9,6 and later.
43 - cgroups
44 CPU accounting information for process groups under Linux.
46 - conntrack
47 Number of nf_conntrack entries.
49 - contextswitch
50 Number of context switches done by the operating system.
52 - cpu
53 CPU utilization: Time spent in the system, user, nice, idle, and related
54 states.
56 - cpufreq
57 CPU frequency (For laptops with speed step or a similar technology)
59 - curl
60 Parse statistics from websites using regular expressions.
62 - curl_json
63 Retrieves JSON data via cURL and parses it according to user
64 configuration.
66 - curl_xml
67 Retrieves XML data via cURL and parses it according to user
68 configuration.
70 - dbi
71 Executes SQL statements on various databases and interprets the returned
72 data.
74 - df
75 Mountpoint usage (Basically the values `df(1)' delivers)
77 - disk
78 Disk utilization: Sectors read/written, number of read/write actions,
79 average time an IO-operation took to complete.
81 - dns
82 DNS traffic: Query types, response codes, opcodes and traffic/octets
83 transfered.
85 - email
86 Email statistics: Count, traffic, spam scores and checks.
87 See collectd-email(5).
89 - entropy
90 Amount of entropy available to the system.
92 - ethstat
93 Network interface card statistics.
95 - exec
96 Values gathered by a custom program or script.
97 See collectd-exec(5).
99 - filecount
100 Count the number of files in directories.
102 - fscache
103 Linux file-system based caching framework statistics.
105 - gmond
106 Receive multicast traffic from Ganglia instances.
108 - hddtemp
109 Harddisk temperatures using hddtempd.
111 - interface
112 Interface traffic: Number of octets, packets and errors for each
113 interface.
115 - iptables
116 Iptables' counters: Number of bytes that were matched by a certain
117 iptables rule.
119 - ipmi
120 IPMI (Intelligent Platform Management Interface) sensors information.
122 - ipvs
123 IPVS connection statistics (number of connections, octets and packets
124 for each service and destination).
125 See http://www.linuxvirtualserver.org/software/index.html.
127 - irq
128 IRQ counters: Frequency in which certain interrupts occur.
130 - java
131 Integrates a `Java Virtual Machine' (JVM) to execute plugins in Java
132 bytecode. See “Configuring with libjvm” below.
134 - load
135 System load average over the last 1, 5 and 15 minutes.
137 - lpar
138 Detailed CPU statistics of the “Logical Partitions” virtualization
139 technique built into IBM's POWER processors.
141 - libvirt
142 CPU, memory, disk and network I/O statistics from virtual machines.
144 - lvm
145 Size of “Logical Volumes” (LV) and “Volume Groups” (VG) of Linux'
146 “Logical Volume Manager” (LVM).
148 - madwifi
149 Queries very detailed usage statistics from wireless LAN adapters and
150 interfaces that use the Atheros chipset and the MadWifi driver.
152 - mbmon
153 Motherboard sensors: temperature, fanspeed and voltage information,
154 using mbmon(1).
156 - md
157 Linux software-RAID device information (number of active, failed, spare
158 and missing disks).
160 - memcachec
161 Query and parse data from a memcache daemon (memcached).
163 - memcached
164 Statistics of the memcached distributed caching system.
165 <http://www.danga.com/memcached/>
167 - memory
168 Memory utilization: Memory occupied by running processes, page cache,
169 buffer cache and free.
171 - mic
172 Collects CPU usage, memory usage, temperatures and power consumption from
173 Intel Many Integrated Core (MIC) CPUs.
175 - modbus
176 Reads values from Modbus/TCP enabled devices. Supports reading values
177 from multiple "slaves" so gateway devices can be used.
179 - multimeter
180 Information provided by serial multimeters, such as the `Metex
181 M-4650CR'.
183 - mysql
184 MySQL server statistics: Commands issued, handlers triggered, thread
185 usage, query cache utilization and traffic/octets sent and received.
187 - netapp
188 Plugin to query performance values from a NetApp storage system using the
189 “Manage ONTAP” SDK provided by NetApp.
191 - netlink
192 Very detailed Linux network interface and routing statistics. You can get
193 (detailed) information on interfaces, qdiscs, classes, and, if you can
194 make use of it, filters.
196 - network
197 Receive values that were collected by other hosts. Large setups will
198 want to collect the data on one dedicated machine, and this is the
199 plugin of choice for that.
201 - nfs
202 NFS Procedures: Which NFS command were called how often. Only NFSv2 and
203 NFSv3 right now.
205 - nginx
206 Collects statistics from `nginx' (speak: engine X), a HTTP and mail
207 server/proxy.
209 - ntpd
210 NTP daemon statistics: Local clock drift, offset to peers, etc.
212 - nut
213 Network UPS tools: UPS current, voltage, power, charge, utilisation,
214 temperature, etc. See upsd(8).
216 - numa
217 Information about Non-Uniform Memory Access (NUMA).
219 - olsrd
220 Queries routing information from the “Optimized Link State Routing”
221 daemon.
223 - onewire (EXPERIMENTAL!)
224 Read onewire sensors using the owcapu library of the owfs project.
225 Please read in collectd.conf(5) why this plugin is experimental.
227 - openvpn
228 RX and TX of each client in openvpn-status.log (status-version 2).
229 <http://openvpn.net/index.php/documentation/howto.html>
231 - oracle
232 Query data from an Oracle database.
234 - perl
235 The perl plugin implements a Perl-interpreter into collectd. You can
236 write your own plugins in Perl and return arbitrary values using this
237 API. See collectd-perl(5).
239 - pf
240 Query statistics from BSD's packet filter "pf".
242 - pinba
243 Receive and dispatch timing values from Pinba, a profiling extension for
244 PHP.
246 - ping
247 Network latency: Time to reach the default gateway or another given
248 host.
250 - postgresql
251 PostgreSQL database statistics: active server connections, transaction
252 numbers, block IO, table row manipulations.
254 - powerdns
255 PowerDNS name server statistics.
257 - processes
258 Process counts: Number of running, sleeping, zombie, ... processes.
260 - protocols
261 Counts various aspects of network protocols such as IP, TCP, UDP, etc.
263 - python
264 The python plugin implements a Python interpreter into collectd. This
265 makes it possible to write plugins in Python which are executed by
266 collectd without the need to start a heavy interpreter every interval.
267 See collectd-python(5) for details.
269 - redis
270 The redis plugin gathers information from a redis server, including:
271 uptime, used memory, total connections etc.
273 - routeros
274 Query interface and wireless registration statistics from RouterOS.
276 - rrdcached
277 RRDtool caching daemon (RRDcacheD) statistics.
279 - sensors
280 System sensors, accessed using lm_sensors: Voltages, temperatures and
281 fan rotation speeds.
283 - serial
284 RX and TX of serial interfaces. Linux only; needs root privileges.
286 - snmp
287 Read values from SNMP (Simple Network Management Protocol) enabled
288 network devices such as switches, routers, thermometers, rack monitoring
289 servers, etc. See collectd-snmp(5).
291 - swap
292 Pages swapped out onto harddisk or whatever is called `swap' by the OS..
294 - table
295 Parse table-like structured files.
297 - tail
298 Follows (tails) logfiles, parses them by lines and submits matched
299 values.
301 - tail_csv
302 Follows (tails) files in CSV format, parses each line and submits
303 extracted values.
305 - tape
306 Bytes and operations read and written on tape devices. Solaris only.
308 - tcpconns
309 Number of TCP connections to specific local and remote ports.
311 - teamspeak2
312 TeamSpeak2 server statistics.
314 - ted
315 Plugin to read values from `The Energy Detective' (TED).
317 - thermal
318 Linux ACPI thermal zone information.
320 - tokyotyrant
321 Reads the number of records and file size from a running Tokyo Tyrant
322 server.
324 - uptime
325 System uptime statistics.
327 - users
328 Users currently logged in.
330 - varnish
331 Various statistics from Varnish, an HTTP accelerator.
333 - vmem
334 Virtual memory statistics, e. g. the number of page-ins/-outs or the
335 number of pagefaults.
337 - vserver
338 System resources used by Linux VServers.
339 See <http://linux-vserver.org/>.
341 - wireless
342 Link quality of wireless cards. Linux only.
344 - xmms
345 Bitrate and frequency of music played with XMMS.
347 - zfs_arc
348 Statistics for ZFS' “Adaptive Replacement Cache” (ARC).
350 * Output can be written or sent to various destinations by the following
351 plugins:
353 - amqp
354 Sends JSON-encoded data to an Advanced Message Queuing Protocol (AMQP)
355 server, such as RabbitMQ.
357 - csv
358 Write to comma separated values (CSV) files. This needs lots of
359 diskspace but is extremely portable and can be analysed with almost
360 every program that can analyse anything. Even Microsoft's Excel..
362 - network
363 Send the data to a remote host to save the data somehow. This is useful
364 for large setups where the data should be saved by a dedicated machine.
366 - perl
367 Of course the values are propagated to plugins written in Perl, too, so
368 you can easily do weird stuff with the plugins we didn't dare think of
369 ;) See collectd-perl(5).
371 - python
372 It's possible to implement write plugins in Python using the python
373 plugin. See collectd-python(5) for details.
375 - rrdcached
376 Output to round-robin-database (RRD) files using the RRDtool caching
377 daemon (RRDcacheD) - see rrdcached(1). That daemon provides a general
378 implementation of the caching done by the `rrdtool' plugin.
380 - rrdtool
381 Output to round-robin-database (RRD) files using librrd. See rrdtool(1).
382 This is likely the most popular destination for such values. Since
383 updates to RRD-files are somewhat expensive this plugin can cache
384 updates to the files and write a bunch of updates at once, which lessens
385 system load a lot.
387 - unixsock
388 One can query the values from the unixsock plugin whenever they're
389 needed. Please read collectd-unixsock(5) for a description on how that's
390 done.
392 - write_graphite
393 Sends data to Carbon, the storage layer of Graphite using TCP or UDP. It
394 can be configured to avoid logging send errors (especially useful when
395 using UDP).
397 - write_http
398 Sends the values collected by collectd to a web-server using HTTP POST
399 requests. The transmitted data is either in a form understood by the
400 Exec plugin or formatted in JSON.
402 - write_mongodb
403 Sends data to MongoDB, a NoSQL database.
405 - write_redis
406 Sends the values to a Redis key-value database server.
408 - write_riemann
409 Sends data to Riemann, a stream processing and monitoring system.
411 * Logging is, as everything in collectd, provided by plugins. The following
412 plugins keep up informed about what's going on:
414 - logfile
415 Writes logmessages to a file or STDOUT/STDERR.
417 - perl
418 Log messages are propagated to plugins written in Perl as well.
419 See collectd-perl(5).
421 - python
422 It's possible to implement log plugins in Python using the python plugin.
423 See collectd-python(5) for details.
425 - syslog
426 Logs to the standard UNIX logging mechanism, syslog.
428 * Notifications can be handled by the following plugins:
430 - notify_desktop
431 Send a desktop notification to a notification daemon, as defined in
432 the Desktop Notification Specification. To actually display the
433 notifications, notification-daemon is required.
434 See http://www.galago-project.org/specs/notification/.
436 - notify_email
437 Send an E-mail with the notification message to the configured
438 recipients.
440 - exec
441 Execute a program or script to handle the notification.
442 See collectd-exec(5).
444 - logfile
445 Writes the notification message to a file or STDOUT/STDERR.
447 - network
448 Send the notification to a remote host to handle it somehow.
450 - perl
451 Notifications are propagated to plugins written in Perl as well.
452 See collectd-perl(5).
454 - python
455 It's possible to implement notification plugins in Python using the
456 python plugin. See collectd-python(5) for details.
458 * Value processing can be controlled using the "filter chain" infrastructure
459 and "matches" and "targets". The following plugins are available:
461 - match_empty_counter
462 Match counter values which are currently zero.
464 - match_hashed
465 Match values using a hash function of the hostname.
467 - match_regex
468 Match values by their identifier based on regular expressions.
470 - match_timediff
471 Match values with an invalid timestamp.
473 - match_value
474 Select values by their data sources' values.
476 - target_notification
477 Create and dispatch a notification.
479 - target_replace
480 Replace parts of an identifier using regular expressions.
482 - target_scale
483 Scale (multiply) values by an arbitrary value.
485 - target_set
486 Set (overwrite) entire parts of an identifier.
488 * Miscellaneous plugins:
490 - aggregation
491 Selects multiple value lists based on patterns or regular expressions
492 and creates new aggregated values lists from those.
494 - threshold
495 Checks values against configured thresholds and creates notifications if
496 values are out of bounds. See collectd-threshold(5) for details.
498 - uuid
499 Sets the hostname to an unique identifier. This is meant for setups
500 where each client may migrate to another physical host, possibly going
501 through one or more name changes in the process.
503 * Performance: Since collectd is running as a daemon it doesn't spend much
504 time starting up again and again. With the exception of the exec plugin no
505 processes are forked. Caching in output plugins, such as the rrdtool and
506 network plugins, makes sure your resources are used efficiently. Also,
507 since collectd is programmed multithreaded it benefits from hyperthreading
508 and multicore processors and makes sure that the daemon isn't idle if only
509 one plugin waits for an IO-operation to complete.
511 * Once set up, hardly any maintenance is necessary. Setup is kept as easy
512 as possible and the default values should be okay for most users.
515 Operation
516 ---------
518 * collectd's configuration file can be found at `sysconfdir'/collectd.conf.
519 Run `collectd -h' for a list of builtin defaults. See `collectd.conf(5)'
520 for a list of options and a syntax description.
522 * When the `csv' or `rrdtool' plugins are loaded they'll write the values to
523 files. The usual place for these files is beneath `/var/lib/collectd'.
525 * When using some of the plugins, collectd needs to run as user root, since
526 only root can do certain things, such as craft ICMP packages needed to ping
527 other hosts. collectd should NOT be installed setuid root since it can be
528 used to overwrite valuable files!
530 * Sample scripts to generate graphs reside in `contrib/' in the source
531 package or somewhere near `/usr/share/doc/collectd' in most distributions.
532 Please be aware that those script are meant as a starting point for your
533 own experiments.. Some of them require the `RRDs' Perl module.
534 (`librrds-perl' on Debian) If you have written a more sophisticated
535 solution please share it with us.
537 * The RRAs of the automatically created RRD files depend on the `step'
538 and `heartbeat' settings given. If change these settings you may need to
539 re-create the files, losing all data. Please be aware of that when changing
540 the values and read the rrdtool(1) manpage thoroughly.
543 collectd and chkrootkit
544 -----------------------
546 If you are using the `dns' plugin chkrootkit(1) will report collectd as a
547 packet sniffer ("<iface>: PACKET SNIFFER(/usr/sbin/collectd[<pid>])"). The
548 plugin captures all UDP packets on port 53 to analyze the DNS traffic. In
549 this case, collectd is a legitimate sniffer and the report should be
550 considered to be a false positive. However, you might want to check that
551 this really is collectd and not some other, illegitimate sniffer.
554 Prerequisites
555 -------------
557 To compile collectd from source you will need:
559 * Usual suspects: C compiler, linker, preprocessor, make, ...
561 * A POSIX-threads (pthread) implementation.
562 Since gathering some statistics is slow (network connections, slow devices,
563 etc) the collectd is parallelized. The POSIX threads interface is being
564 used and should be found in various implementations for hopefully all
565 platforms.
567 * aerotools-ng (optional)
568 Used by the `aquaero' plugin. Currently, the `libaquaero5' library, which
569 is used by the `aerotools-ng' toolkit, is not compiled as a shared object
570 nor does it feature an installation routine. Therefore, you need to point
571 collectd's configure script at the source directory of the `aerotools-ng'
572 project.
573 <https://github.com/lynix/aerotools-ng>
575 * CoreFoundation.framework and IOKit.framework (optional)
576 For compiling on Darwin in general and the `apple_sensors' plugin in
577 particular.
578 <http://developer.apple.com/corefoundation/>
580 * libclntsh (optional)
581 Used by the `oracle' plugin.
583 * libcredis (optional)
584 Used by the redis plugin. Please note that you require a 0.2.2 version
585 or higher. <http://code.google.com/p/credis/>
587 * libcurl (optional)
588 If you want to use the `apache', `ascent', `curl', `nginx', or `write_http'
589 plugin.
590 <http://curl.haxx.se/>
592 * libdbi (optional)
593 Used by the `dbi' plugin to connect to various databases.
594 <http://libdbi.sourceforge.net/>
596 * libesmtp (optional)
597 For the `notify_email' plugin.
598 <http://www.stafford.uklinux.net/libesmtp/>
600 * libganglia (optional)
601 Used by the `gmond' plugin to process data received from Ganglia.
602 <http://ganglia.info/>
604 * libgcrypt (optional)
605 Used by the `network' plugin for encryption and authentication.
606 <http://www.gnupg.org/>
608 * libhal (optional)
609 If present, the uuid plugin will check for UUID from HAL.
610 <http://hal.freedesktop.org/>
612 * libiptc (optional)
613 For querying iptables counters.
614 <http://netfilter.org/>
616 If not found on the system, a version shipped with this distribution can
617 be used. It requires some Linux headers in /usr/include/linux. You can
618 force the build system to use the shipped version by specifying
619 --with-libiptc=shipped
620 when running the configure script.
622 * libjvm (optional)
623 Library that encapsulates the `Java Virtual Machine' (JVM). This library is
624 used by the Java plugin to execute Java bytecode. See “Configuring with
625 libjvm” below.
626 <http://openjdk.java.net/> (and others)
628 * libmemcached (optional)
629 Used by the `memcachec' plugin to connect to a memcache daemon.
630 <http://tangent.org/552/libmemcached.html>
632 * libmodbus (optional)
633 Used by the “modbus” plugin to communicate with Modbus/TCP devices. The
634 “modbus” plugin works with version 2.0.3 of the library – due to frequent
635 API changes other versions may or may not compile cleanly.
636 <http://www.libmodbus.org/>
638 * libmysqlclient (optional)
639 Unsurprisingly used by the `mysql' plugin.
640 <http://dev.mysql.com/>
642 * libnetapp (optional)
643 Required for the “netapp” plugin.
644 This library is part of the “Manage ONTAP SDK” published by NetApp.
646 * libnetlink (optional)
647 Used, obviously, for the `netlink' plugin.
648 <http://www.linuxfoundation.org/en/Net:Iproute2>
650 * libnetsnmp (optional)
651 For the `snmp' plugin.
652 <http://www.net-snmp.org/>
654 * libnotify (optional)
655 For the `notify_desktop' plugin.
656 <http://www.galago-project.org/>
658 * liboping (optional)
659 Used by the `ping' plugin to send and receive ICMP packets.
660 <http://verplant.org/liboping/>
662 * libowcapi (optional)
663 Used by the `onewire' plugin to read values from onewire sensors (or the
664 owserver(1) daemon).
665 <http://www.owfs.org/>
667 * libpcap (optional)
668 Used to capture packets by the `dns' plugin.
669 <http://www.tcpdump.org/>
671 * libperfstat (optional)
672 Used by various plugins to gather statistics under AIX.
674 * libperl (optional)
675 Obviously used by the `perl' plugin. The library has to be compiled with
676 ithread support (introduced in Perl 5.6.0).
677 <http://www.perl.org/>
679 * libpq (optional)
680 The PostgreSQL C client library used by the `postgresql' plugin.
681 <http://www.postgresql.org/>
683 * libprotobuf-c, protoc-c (optional)
684 Used by the `pinba' plugin to generate a parser for the network packets
685 sent by the Pinba PHP extension.
686 <http://code.google.com/p/protobuf-c/>
688 * libpython (optional)
689 Used by the `python' plugin. Currently, Python 2.3 and later and Python 3
690 are supported.
691 <http://www.python.org/>
693 * librabbitmq (optional; also called “rabbitmq-c”)
694 Used by the AMQP plugin for AMQP connections, for example to RabbitMQ.
695 <http://hg.rabbitmq.com/rabbitmq-c/>
697 * librouteros (optional)
698 Used by the `routeros' plugin to connect to a device running `RouterOS'.
699 <http://verplant.org/librouteros/>
701 * librrd (optional)
702 Used by the `rrdtool' and `rrdcached' plugins. The latter requires RRDtool
703 client support which was added after version 1.3 of RRDtool. Versions 1.0,
704 1.2 and 1.3 are known to work with the `rrdtool' plugin.
705 <http://oss.oetiker.ch/rrdtool/>
707 * librt, libsocket, libkstat, libdevinfo (optional)
708 Various standard Solaris libraries which provide system functions.
709 <http://developers.sun.com/solaris/>
711 * libsensors (optional)
712 To read from `lm_sensors', see the `sensors' plugin.
713 <http://www.lm-sensors.org/>
715 * libstatgrab (optional)
716 Used by various plugins to collect statistics on systems other than Linux
717 and/or Solaris.
718 <http://www.i-scream.org/libstatgrab/>
720 * libtokyotyrant (optional)
721 Used by the tokyotyrant plugin.
722 <http://1978th.net/tokyotyrant/>
724 * libupsclient/nut (optional)
725 For the `nut' plugin which queries nut's `upsd'.
726 <http://networkupstools.org/>
728 * libvirt (optional)
729 Collect statistics from virtual machines.
730 <http://libvirt.org/>
732 * libxml2 (optional)
733 Parse XML data. This is needed for the `ascent' and `libvirt' plugins.
734 <http://xmlsoft.org/>
736 * libxmms (optional)
737 <http://www.xmms.org/>
739 * libyajl (optional)
740 Parse JSON data. This is needed for the `curl_json' plugin.
741 <http://github.com/lloyd/yajl>
743 * libvarnish (optional)
744 Fetches statistics from a Varnish instance. This is needed for the Varnish plugin
745 <http://varnish-cache.org>
747 Configuring / Compiling / Installing
748 ------------------------------------
750 To configure, build and install collectd with the default settings, run
751 `./configure && make && make install'. For detailed, generic instructions
752 see INSTALL. For a complete list of configure options and their description,
753 run `./configure --help'.
755 By default, the configure script will check for all build dependencies and
756 disable all plugins whose requirements cannot be fulfilled (any other plugin
757 will be enabled). To enable a plugin, install missing dependencies (see
758 section `Prerequisites' above) and rerun `configure'. If you specify the
759 `--enable-<plugin>' configure option, the script will fail if the depen-
760 dencies for the specified plugin are not met. In that case you can force the
761 plugin to be built using the `--enable-<plugin>=force' configure option.
762 This will most likely fail though unless you're working in a very unusual
763 setup and you really know what you're doing. If you specify the
764 `--disable-<plugin>' configure option, the plugin will not be built. If you
765 specify the `--enable-all-plugins' or `--disable-all-plugins' configure
766 options, all plugins will be enabled or disabled respectively by default.
767 Explicitly enabling or disabling a plugin overwrites the default for the
768 specified plugin. These options are meant for package maintainers and should
769 not be used in everyday situations.
771 By default, collectd will be installed into `/opt/collectd'. You can adjust
772 this setting by specifying the `--prefix' configure option - see INSTALL for
773 details. If you pass DESTDIR=<path> to `make install', <path> will be
774 prefixed to all installation directories. This might be useful when creating
775 packages for collectd.
777 Configuring with libjvm
778 -----------------------
780 To determine the location of the required files of a Java installation is not
781 an easy task, because the locations vary with your kernel (Linux, SunOS, …)
782 and with your architecture (x86, SPARC, …) and there is no ‘java-config’
783 script we could use. Configuration of the JVM library is therefore a bit
784 tricky.
786 The easiest way to use the `--with-java=$JAVA_HOME' option, where
787 `$JAVA_HOME' is usually something like:
788 /usr/lib/jvm/java-1.5.0-sun-1.5.0.14
790 The configure script will then use find(1) to look for the following files:
792 - jni.h
793 - jni_md.h
794 - libjvm.so
796 If found, appropriate CPP-flags and LD-flags are set and the following
797 library checks succeed.
799 If this doesn't work for you, you have the possibility to specify CPP-flags,
800 C-flags and LD-flags for the ‘Java’ plugin by hand, using the following three
801 (environment) variables:
803 - JAVA_CPPFLAGS
804 - JAVA_CFLAGS
805 - JAVA_LDFLAGS
807 For example (shortened for demonstration purposes):
809 ./configure JAVA_CPPFLAGS="-I$JAVA_HOME/include -I$JAVA_HOME/include/linux"
811 Adding "-ljvm" to the JAVA_LDFLAGS is done automatically, you don't have to
812 do that.
814 Crosscompiling
815 --------------
817 To compile correctly collectd needs to be able to initialize static
818 variables to NAN (Not A Number). Some C libraries, especially the GNU
819 libc, have a problem with that.
821 Luckily, with GCC it's possible to work around that problem: One can define
822 NAN as being (0.0 / 0.0) and `isnan' as `f != f'. However, to test this
823 ``implementation'' the configure script needs to compile and run a short
824 test program. Obviously running a test program when doing a cross-
825 compilation is, well, challenging.
827 If you run into this problem, you can use the `--with-nan-emulation'
828 configure option to force the use of this implementation. We can't promise
829 that the compiled binary actually behaves as it should, but since NANs
830 are likely never passed to the libm you have a good chance to be lucky.
832 Likewise, collectd needs to know the layout of doubles in memory, in order
833 to craft uniform network packets over different architectures. For this, it
834 needs to know how to convert doubles into the memory layout used by x86. The
835 configure script tries to figure this out by compiling and running a few
836 small test programs. This is of course not possible when cross-compiling.
837 You can use the `--with-fp-layout' option to tell the configure script which
838 conversion method to assume. Valid arguments are:
840 * `nothing' (12345678 -> 12345678)
841 * `endianflip' (12345678 -> 87654321)
842 * `intswap' (12345678 -> 56781234)
845 Contact
846 -------
848 For questions, bug reports, development information and basically all other
849 concerns please send an email to collectd's mailing list at
850 <collectd at verplant.org>.
852 For live discussion and more personal contact visit us in IRC, we're in
853 channel #collectd on freenode.
856 Author
857 ------
859 Florian octo Forster <octo at verplant.org>,
860 Sebastian tokkee Harl <sh at tokkee.org>,
861 and many contributors (see `AUTHORS').
863 Please send bug reports and patches to the mailing list, see `Contact'
864 above.