Monitoring Plugins

Version 3.0.0-rc2 Released

Fri, 02 Jan 2026 11:00:00 -0000

Version 3.0.0-rc2 Released

Lorenz Kästle, January 2, 2026

The Monitoring Plugins Development Team announces version 3.0.0-rc2 of the Monitoring Plugins!

This is the second release candidate for version 3.0.0.

It contains mostly fixes to the 3.0.0-rc1 version and is also not a full release, but serves as a basis for test until we are mostly sure not to break production setups.

Changes

check_nt was removed check_nt is no long useful in current setups and hasn't been for some time. Therefore it was removed without a replacement.
check_ntp was removed check_ntp was marked as deprecated for a long time due to systematic problems. It should not be in use anywhere and gets now removed to reduce code size and avoid misleading users. The replacements are check_ntp_time and check_ntp_peer
Bugfix for check_ntp_time An errournous change in check_ntp_time made it fail in almost all use cases. This has been fixed
Properly separate perfdata from different subchecks A missing separator caused errors in perfdata strings (from C plugins) where two different data points where not properly separated and showed up as a single invalid data point
check_curl: append the query string from parsed uri When using the old style follow method (-f follow) with check_curl the query string was not appended to the new target after redirect. This was fixed. (Thanks Ahmet Oeztuerk)
Fixing different problems on OpenBSD A few different things did prevent proper compilation and usage on OpenBSD, partly due to different naming conventions there. These are hopefully fixed now. Thanks to Alvar Penning and Stuart Henderson.
Gnulib update to stable-202507

Version 3.0.0-rc1 Released

Wed, 03 Dec 2025 11:00:00 -0000

Version 3.0.0-rc1 Released

Lorenz Kästle, December 3, 2025

The Monitoring Plugins Development Team announces version 3.0.0-rc1 of the Monitoring Plugins! This release is different in several regards to previous releases. Due the a significant refactoring and the unintented side effect this may have, the "real" release will be following release candidates which are intented to for early adapters and testing.

The core parts of this release are significant changes to the C part of this project, which should be mostly internal and not change the results in a significant way (meaning the input parameters mostly stay as they are and the exit code should remain the same if the parameters are the same in the old version and context did not change). The reality is, that big changes have unintented consequences which are not covered in the test cases or some consequences were not in our scope at all. For the list of notable changes in this release, see below.

You can get the tarball from our download page.

General changes

In the C part of the project
Heavy refactoring to simplify and unify the code base
Introduction of a generalized output mechanism for most plugins
Standardized code formatting via clang-format

Specific changes

check_curl

check_curl received a lot of changes which improve the documentation and fix several bugs. It is also not considered experimental anymore.

Additionaly check_curl can now be configured to handle cookies internally without saving cookies to the filesystem.

check_http

check_http is now considered deprecated and will not receive attention any more. It is replaced by check_curl

check_snmp

check_snmp does not execute snmpget or snmpgetnext anymore but executes the net-snmp calls natively now.

check_nwstat

check_nwstat was removed, due to its perceived insignificance in the current IT world. This reduces the maintenance load and ressource consumption in general.

check_by_ssh

check_by_ssh ignores output on stderr by default now. This should avoid false positives for warnings by the OpenSSH client (especially about the server missing Post-Quantum cryptography.

check_dns

check_dns now ignores CNAMES in reverse DNS mode.

check_fping

If during compilation fping 5.2, 5.3 or higher are present, check_fping will be able to use new options which were introduced with these versions. These options are (equivalent to the ones with the same name in fping) --fwmark, --icmp-timestamp and --check-source. The older flags --dontfrag and --random were also added.

Also the -4 and -6 flags may not have worked as intented and should be fixed now.

check_mysql

check_mysql should now be able to correctly detect whether a replica is attached and working correctly. Changes were necessary here to adapt to changes in the naming convention in MySQL.

Monitoring Plugins Wins BlueHats Prize

Mon, 30 Dec 2024 11:00:00 -0000

Monitoring Plugins Wins BlueHats Prize

Holger Weiß, December 30, 2024

As announced by the NLnet Foundation, the Monitoring Plugins team is the winner of the fourth 2024 BlueHats prize!

BlueHats prizes are an initiative by the French Interministerial Digital Directorate. They are awarded to maintainers of critical free and open source projects. In 2024, four prizes of € 10,000 each have been given out.

The jury, made up of public officials from ANSSI and DINUM, recognised the central role of Monitoring Plugins in the running of Internet services. Monitoring Plugins is critical infrastructure that is widely used and relies on a small group of contributors. The interface is simple, but the tasks that the plugins perform can be hard to perform and has to be efficient. Since so many systems run these programs often, they need to be reliable and safe.

A representative of DINUM says:

We know for sure that many public administrations depend indirectly on Monitoring Plugins: this project is typical of a niche Free Software initiative that helps other tools to remain accurate, here in the monitoring area. We hope that this award will help the maintainers to get more sponsors and direct contributions!

The Monitoring Plugins team is honored by the recognition by the jury. As a small corner stone of many IT monitoring solutions, we are seldom as visible as big name projects, but are happy to contribute our part to support the infrastructure all of us rely on in our society. Especially as infrastructure is often boring (as it should be), it is not often visible and usually only receives attention when it fails. In this spirit we are particulary thankful for people and institutions who care about the small and boring little cogs of the big machinery. This is not self-evident and we appreciate the effort and hope to continue to provide reliable software to the world.

Version 2.4.0 Released

Thu, 25 Jul 2024 10:00:00 -0000

Version 2.4.0 Released

Jan Wagner, July 25, 2024

The Monitoring Plugins Development Team is proud to announce version 2.4.0 of the Monitoring Plugins! This release comes with various fixes provided by more than 12 contributors. Many thanks to all of you!

For the list of notable changes in this release, see below.

You can get the tarball from our download page.

Enhancements

General

Use C99 booleans
Improve negate plugin helptext
Add new test function for percentage expressions

Single Plugins

check_mailq: remove trailing whitespaces
check_mailq: unify tabs/spaces
check_oracle: Shellcheck fixes
check_ups: output ups.realpower if supported
check_disk: add -n short option for --ignore-missing
check_procs: Improve help text, mentioning excluded processes
check_procs: Generalise wording, remove mentioning of nrpe
check_curl: add haproxy protocol option
check_disk: increase alert precision
check_ircd: IPv6 support
check_nwstat: adds percentage used space
check_swap: Possibility to run check_swap without thresholds
check_ups: additional alarm conditions
check_http/check_curl: added a --regex-state option to change the state of a regex check

Fixes

General

Fixes for -Wsign-compare
Fix logic in is_uint64_t to fix type-limit warning
Prevent -lcrypto from showing up in Makefile dependencies
Change irritating NULL assignment

Single Plugins

check_dbi: Compiler warning for uninitialized variable
check_curl: Initialize pointer before usage
check_ntp: Initialize intermediate results in any case
check_tcp: Fixes an error with using the wrong type for a variable
check_mailq: exit on empty strings and exit early
check_users: Change option for sanity checking arguments to avoid segfault
check_users: Update help to properly show that thresholds are ranges
check_users: fix segfault
check_dbi: Fix compiler warning for uninitialized variable
check_curl: Initialize pointer before usage
check_ntp: Initialize intermediate results in any case
check_ntp_peer: Fixes for Wmaybe-unitialized and some restructuring
check_dns: Remove unused variable
check_disk: fix ignore-missing in combination with includes
check_procs: ignore our own children
check_http: Remove self assignment of a variable and add some comments
check_snmp: Remove unused variable
check_dhcp: Make implicit conversion explicit to dismiss warning
Ini Parser: Avoid freeing symbols from text section
check_icmp: keep performance data order in case of none-reachable hosts
check_swap: Change another fake boolean to a real one
check_swap: Rename type since *_t is reserved for C standard types
check_ssh: Fix a typo in "remote-protocol parameter
check_ssh: Handle non-alpha software versions
check_ssh: properly parse a delayed version control string
check_disk: Fail on missing arguments for --warning and --critical and fix a test case
check_disk: Use new test function for percentage expressions
check_load: remove unused code
check_curl/check_http: clarified format of POST data

Version 2.3.5 Released

Wed, 18 Oct 2023 10:00:00 -0000

Version 2.3.5 Released

Jan Wagner, October 18, 2023

The Monitoring Plugins Development Team is proud to announce version 2.3.5 of the Monitoring Plugins! This release comes just with a small fix preventing the tarball from being built. Sorry for this.

For the list of notable changes in this release, see below.

You can get the tarball from our download page.

Fixes

General

Include maxfd.h in lib Makefile

Please also have a look into the changes from the 2.3.4 release, you might have missed.

Version 2.3.4 Released

Wed, 18 Oct 2023 10:00:00 -0000

Version 2.3.4 Released

Jan Wagner, October 18, 2023

The Monitoring Plugins Development Team is proud to announce version 2.3.4 of the Monitoring Plugins! This release comes with various fixes provided by more than 30 contributors. Many thanks to all of you!

For the list of notable changes in this release, see below.

You can get the tarball from our download page.

Enhancements

General

Sync with the Gnulib code 668c0b8ffa
Set autoconf prerequisite version to 2.64
Remove sha1 and use sha256 in some parts of the plugin structure

Single Plugins

check_curl: added --cookie-jar and doing proper cleanup of libcurl
check_curl: Include all IPs from getaddrinfo() in curl DNS cache
check_dhcp: Add dhcp rogue detection
check_disk: add ignore-missing option to return OK for missing fs
check_disk_smb: allow checking 0-sized resource (ex. IPC$)
check_disk: The options to include or exclude specific file systems now allow the usage of regex(7)
check_icmp: Add support to Jitter, MOS and Score
check_mysql: Detect running mysqldump and handle it more gracefully
check_procs: Implement --exclude-process to exclude specific processes
check_smtp: add new longoption --tls
check_smtp: Add option to prefix PROXY header
check_smtp: Add support for SMTP over TLS
check_smtp: Add support for SNI
check_snmp: Implement option to ignore mib file parsing errors
check_users: prefer systemd-logind over utmp

Fixes

General

A lot of compiler warnings were fixed
Some code was refactored a little bit

Single Plugins

check_disk: Display SI units correctly
check_ircd: use pack_sockaddr_in rather than hand-rolled
check_log/check_oracle/check_sensors: fixed the outputs of the help functionality
check_mysql: Add mysql_close to avoid spamming the server logs
check_smtp: add missing -r option in usage
check_snmp: disable multiplier when unused
check_wave: Use compile time determined path to snmpget

Version 2.3.3 Released

Thu, 02 Feb 2023 11:00:00 -0000

Version 2.3.3 Released

Jan Wagner, February 2, 2023

The Monitoring Plugins Development Team is proud to announce version 2.3.3 of the Monitoring Plugins! This release comes with various fixes provided by more than 16 contributors. Many thanks to all of you!

For the list of notable changes in this release, see below.

You can get the tarball from our download page.

Enhancements

General

using PRId64 and PRIu64 instead of %ld directly

Single Plugins

check_http: Make faster with larger files
check_snmp: add 'multiplier' to modify current value
check_http: Implement chunked encoding decoding
check_http/check_curl: add chunked encoding test
check_log: Added --exclude to exclude patterns
check_log: Add tests
check_disk: Clarify usage possibilites

Fixes

General

fixed two PRId64 to PRIu64 in perfdata_uint64

Single Plugins

check_pgsql: Removing is_pg_dbname alltogether,using postgres API.
check_http: Remove superflous CRLF in HTTP-Requests
check_curl: detect ipv6
check_icmp: fix parsing help/version long options
check_http: fix test plan
check_disk: Find accessible mount path if multiple are available
check_apt: Fix unknown escape sequence error output
check_curl: fix checking large bodys
check_snmp: Improve tests for check_snmp & multiply option
check_snmp: always apply format when applying multiplier
check_http: Use real booleans instead of ints
check_http: Document process_arguments a little bit better
check_http: Remove dead code
check_http: Fix several bug in the implementation of unchunking
check_http: Reformat a part to increase readability
check_apt: Put upgrade options in the root sections
check_apt: Fix comment
check_apt: Use real booleans
check_mailq: Fixing nullmailer regex
check_snmp: Fix regex matches
check_log: Fixed a bug when using --all
check_log: Cleaned up duplicated code in the args
check_http: Fix memory reallocation error in chunk decoding logic
check_http: Add space for ending NULL byte in array for chunked encoding

Version 2.3.2 Released

Thu, 20 Oct 2022 10:00:00 -0000

Version 2.3.2 Released

Sven Nierlein, October 20, 2022

The Monitoring Plugins Development Team is proud to announce version 2.3.2 of the Monitoring Plugins! This release comes with various fixes provided by more than 40 contributors. Many thanks to all of you!

For the list of notable changes in this release, see below.

You can get the tarball from our download page.

General

Use netcat-openbsd for debian explicitely by @RincewindsHat in https://github.com/monitoring-plugins/monitoring-plugins/pull/1704
Replace egrep with grep -E by @RincewindsHat in https://github.com/monitoring-plugins/monitoring-plugins/pull/1791
Use silent automake by default by @RincewindsHat in https://github.com/monitoring-plugins/monitoring-plugins/pull/1747

Single Plugins

check_by_ssh: added option to exit with an warning, if there is output on STDERR by @nafets in https://github.com/monitoring-plugins/monitoring-plugins/pull/1301
check_by_ssh: Add "-U" flag (#1123). by @archiecobbs in https://github.com/monitoring-plugins/monitoring-plugins/pull/1774
check_by_ssh: Let ssh decide if a host is valid, enables usage of ssh .config file by @RincewindsHat in https://github.com/monitoring-plugins/monitoring-plugins/pull/1691
check_curl: Add an option to check_curl to verify the peer certificate & host using the system CA's by @bazzisoft in https://github.com/monitoring-plugins/monitoring-plugins/pull/1669
check_curl: fixed -ffollow for HTTP/2.0 (Fixes #1685): added major_version parsing to PicoHTTPParser by @andreasbaumann in https://github.com/monitoring-plugins/monitoring-plugins/pull/1742
check_curl: fixes check_curl: "CRITICAL - Cannot retrieve certificate subject." by @andreasbaumann in https://github.com/monitoring-plugins/monitoring-plugins/pull/1689
check_curl: fix if http header contains leading spaces by @sni in https://github.com/monitoring-plugins/monitoring-plugins/pull/1666
check_curl: Update check_curl.c to display a specific human-readable error message where possible by @bazzisoft in https://github.com/monitoring-plugins/monitoring-plugins/pull/1668
check_curl: verify certificates option should not force SSL to be used by @bazzisoft in https://github.com/monitoring-plugins/monitoring-plugins/pull/1688
check_disk: Description for -M was the wrong way around by @RincewindsHat in https://github.com/monitoring-plugins/monitoring-plugins/pull/1746
check_disk: Fixing the stuff that is broken on btrfs by @waja in https://github.com/monitoring-plugins/monitoring-plugins/pull/1388
check_disk: Fix perfdata for big values for check disk by @RincewindsHat in https://github.com/monitoring-plugins/monitoring-plugins/pull/1714
check_disk_smb: Add configfile feature by @Napsty in https://github.com/monitoring-plugins/monitoring-plugins/pull/1402
check_disk_smb: Add timeout by @cdruee in https://github.com/monitoring-plugins/monitoring-plugins/pull/1770
check_dns: Add --expect-nxdomain by @Jonny007-MKD in https://github.com/monitoring-plugins/monitoring-plugins/pull/1623
check_dns: split multiple IP addresses passed in one -a argument by @DerDakon in https://github.com/monitoring-plugins/monitoring-plugins/pull/1649
check_file_age: Make size parameter a little bit more intelligible by @RincewindsHat in https://github.com/monitoring-plugins/monitoring-plugins/pull/1730
check_fping: Implements 'host-alive' mode (Closes. #1027) by @waja in https://github.com/monitoring-plugins/monitoring-plugins/pull/1740
check_game: Update Url to qstat by @RincewindsHat in https://github.com/monitoring-plugins/monitoring-plugins/pull/1725
check_http: changed 'STATE_CRITICAL' to 'STATE_WARNING' for infinite loop by @xFuture603 in https://github.com/monitoring-plugins/monitoring-plugins/pull/1690
check_http: Increase regexp limit by @hydrapolic in https://github.com/monitoring-plugins/monitoring-plugins/pull/1566
check_http: Support http redirect by @waja in https://github.com/monitoring-plugins/monitoring-plugins/pull/1449
check_icmp: buffer offerflow by @RincewindsHat in https://github.com/monitoring-plugins/monitoring-plugins/pull/1733
check_icmp: delay set_source_ip() until address_family is detected by @ghciv6 in https://github.com/monitoring-plugins/monitoring-plugins/pull/1735
check_icmp: Fix "Invalid Argument" from sendmsg() under FreeBSD 13.1 and "setsockopt failed" for TTL setting by @eriksejr in https://github.com/monitoring-plugins/monitoring-plugins/pull/1771
check_icmp: Fix pkt perfdata in check_host mode by @sjoegren in https://github.com/monitoring-plugins/monitoring-plugins/pull/1721
check_ldap: Allows check_ldap to read password from environment variable by @mullumaus in https://github.com/monitoring-plugins/monitoring-plugins/pull/1724
check_load: add LOAD prefix to load plugin by @haraldj in https://github.com/monitoring-plugins/monitoring-plugins/pull/1694
check_load: Display total and scaled load values if check_load scales the values by number of CPUs by @RincewindsHat in https://github.com/monitoring-plugins/monitoring-plugins/pull/1778
check_log: Missing oldlog now aborts check_log by @RincewindsHat in https://github.com/monitoring-plugins/monitoring-plugins/pull/1732
check_mailq: Add mailq -C option for config dir or config file by @leeclemens in https://github.com/monitoring-plugins/monitoring-plugins/pull/1490
check_mailq: Check mailq domain specific warnings by @RincewindsHat in https://github.com/monitoring-plugins/monitoring-plugins/pull/1731
check_mailq: Fix regexp for nullmailer "mailq" output by @darksoul42 in https://github.com/monitoring-plugins/monitoring-plugins/pull/1493
check_mysql: fix segfaults with mysql-connector-c #1562 by @ghciv6 in https://github.com/monitoring-plugins/monitoring-plugins/pull/1644
check_pgsql: add --queryname parameter to check_pgsql by @datamuc in https://github.com/monitoring-plugins/monitoring-plugins/pull/1741
check_ping: Do not show RTA if no connection was possible by @RincewindsHat in https://github.com/monitoring-plugins/monitoring-plugins/pull/1697
check_ping: understang ping6 output from iputils package by @glensc in https://github.com/monitoring-plugins/monitoring-plugins/pull/1412
check_proc: Fix check proc ps detection by @sni in https://github.com/monitoring-plugins/monitoring-plugins/pull/1712
check_procs: exchange needle and haystack in strstr() for proper st… by @wolfgangkarall in https://github.com/monitoring-plugins/monitoring-plugins/pull/1654
check_smtp: add -L flag to support LMTP (LHLO instead of HELO/EHLO). by @ghen2 in https://github.com/monitoring-plugins/monitoring-plugins/pull/1715
check_snmp: Added option for null zero length string exit codes by @FracKenA in https://github.com/monitoring-plugins/monitoring-plugins/pull/1496
check_snmp: fix performance thresholds when using multiple oids by @sni in https://github.com/monitoring-plugins/monitoring-plugins/pull/1722
check_snmp fix segfaults by @adrb in https://github.com/monitoring-plugins/monitoring-plugins/pull/1589
check_snmp: put the "c" (to mark a counter) after the perfdata value by @lausser in https://github.com/monitoring-plugins/monitoring-plugins/pull/1465
check_swap: fix parsing swap values by @sni in https://github.com/monitoring-plugins/monitoring-plugins/pull/1780
check_swap: Fix perfdata for check swap by @RincewindsHat in https://github.com/monitoring-plugins/monitoring-plugins/pull/1707
check_swap: Fix unit for total in perfdata by @RincewindsHat in https://github.com/monitoring-plugins/monitoring-plugins/pull/1779
check_swap: Handle cached swap by @mdavranche in https://github.com/monitoring-plugins/monitoring-plugins/pull/1642
check_swap: Small fix to threshold validation and style (indentation) fixes by @RincewindsHat in https://github.com/monitoring-plugins/monitoring-plugins/pull/1723
check_ups: Fix possible overflow in check_ups by @phibos in https://github.com/monitoring-plugins/monitoring-plugins/pull/1727
check_uptime: Add option to report uptime in days instead of seconds by @amotl in https://github.com/monitoring-plugins/monitoring-plugins/pull/1750
check_uptime: Fix/improve output message "Uptime is ..." by @amotl in https://github.com/monitoring-plugins/monitoring-plugins/pull/1751

Multiple Plugins

check_http, check_curl: added --max-redirs=N option (feature #1684) by @andreasbaumann in https://github.com/monitoring-plugins/monitoring-plugins/pull/1744
check_http, check_curl: Enhancement --continue-after-certificate (backport from nagios-plugins) by @andreasbaumann in https://github.com/monitoring-plugins/monitoring-plugins/pull/1762
check_http, check_curl: Remove check_http and check_curl test which are somehow always failing by @RincewindsHat in https://github.com/monitoring-plugins/monitoring-plugins/pull/1777
check_log, check_oracle, check_sensors: Several fixes shellcheck complaining about by @waja in https://github.com/monitoring-plugins/monitoring-plugins/pull/1459
sslutils: use chain from client certificates by @tobiaswiese in https://github.com/monitoring-plugins/monitoring-plugins/pull/1664

Non functional changes

Trivial source code whitespace formatting fixes to standard. by @ziesemer in https://github.com/monitoring-plugins/monitoring-plugins/pull/1424
docs: fix simple typo, conspicuosly -> conspicuously by @timgates42 in https://github.com/monitoring-plugins/monitoring-plugins/pull/1652
Migrate to GitHub actions by @jacobbaungard in https://github.com/monitoring-plugins/monitoring-plugins/pull/1686
Point to Icinga Exchange instead of dead Monitoring Exchange by @RincewindsHat in https://github.com/monitoring-plugins/monitoring-plugins/pull/1737
github actions: fix check_users test case by @sni in https://github.com/monitoring-plugins/monitoring-plugins/pull/1713
Add CodeQL checks by @phibos in https://github.com/monitoring-plugins/monitoring-plugins/pull/1682
Fix some QL problems by @RincewindsHat in https://github.com/monitoring-plugins/monitoring-plugins/pull/1729
Update CodeQL and update runner before installing by @RincewindsHat in https://github.com/monitoring-plugins/monitoring-plugins/pull/1775
check_disk: Check disk compiler warnings by @RincewindsHat in https://github.com/monitoring-plugins/monitoring-plugins/pull/1758
check_disk: Trivial printf fix and a little bit of code style by @RincewindsHat in https://github.com/monitoring-plugins/monitoring-plugins/pull/1695
check_http: Docs: make -C obvious by @stblassitude in https://github.com/monitoring-plugins/monitoring-plugins/pull/1554
check_ifoperstatus: Re-attach a comment to where it actually belongs by @peternewman in https://github.com/monitoring-plugins/monitoring-plugins/pull/1699
check_ircd: Restrict the nickname length of the test user for check_ircd by @RincewindsHat in https://github.com/monitoring-plugins/monitoring-plugins/pull/1710
check_load: Check load compiler warnings by @RincewindsHat in https://github.com/monitoring-plugins/monitoring-plugins/pull/1759
check_log Modernize check log by @RincewindsHat in https://github.com/monitoring-plugins/monitoring-plugins/pull/1692
check_mailq: remove duplicate W=i/C=i args in check_mailq.pl by @ichdasich in https://github.com/monitoring-plugins/monitoring-plugins/pull/1755
check_ntp: Check ntp remove unused variables by @RincewindsHat in https://github.com/monitoring-plugins/monitoring-plugins/pull/1781
check_pgsql: Using snprintf which honors the buffers size and guarantees null temination. (Closes: #1601) by @waja in https://github.com/monitoring-plugins/monitoring-plugins/pull/1663
check_procs: Fix double percentage sign in usage by @RincewindsHat in https://github.com/monitoring-plugins/monitoring-plugins/pull/1743
check_sensors.sh: Make shellcheck happier by @RincewindsHat in https://github.com/monitoring-plugins/monitoring-plugins/pull/1679
check_snmp: Fixed option description authpassword -> authpasswd + whitespaces by @RincewindsHat in https://github.com/monitoring-plugins/monitoring-plugins/pull/1676
check_swap: Check swap compiler warnings by @RincewindsHat in https://github.com/monitoring-plugins/monitoring-plugins/pull/1756

Version 2.3.1 Released

Sun, 11 Apr 2021 10:00:00 -0000

Version 2.3.1 Released

Jan Wagner, April 11, 2021

The Monitoring Plugins Development Team is proud to announce version 2.3.1 of the Monitoring Plugins! This release comes with various fixes provided by more than ten contributors, mostly for check_curl. Many thanks to all of you!

For the list of notable changes in this release, see below.

You can get the tarball from our download page.

Enhancements

check_curl: Add an option to verify the peer certificate & host using the system CA's

Fixes

check_icmp: fix simple typo, conspicuosly -> conspicuously
check_curl: fixed help, usage and errors for TLS 1.3
check_curl: fixed a potential buffer overflow in url buffer
check_dns: split multiple IP addresses passed in one -a argument
check_curl: added string_statuscode function for printing HTTP/1.1 and HTTP/2 correctly
check_curl: fix crash if http header contains leading spaces
check_curl: display a specific human-readable error message where possible
check_pgsql: Using snprintf which honors the buffers size and guarantees null termination.
check_snmp: put the "c" (to mark a counter) after the perfdata value
check_http: Increase regexp limit
check_http: make -C obvious
check_curl: Increase regexp limit (to 1024 as in check_http)
check_curl: make -C obvious (from check_http)

Version 2.3 Released

Thu, 10 Dec 2020 11:00:00 -0000

Version 2.3 Released

Jan Wagner, December 10, 2020

The Monitoring Plugins Development Team is proud to announce version 2.3 of the Monitoring Plugins! This release comes with various enhancements and fixes provided by more than thirty contributors, a highlight might be the inclusion of check_curl. Many thanks to all of you!

For the list of notable changes in this release, see below.

You can get the tarball from our download page.

Enhancements

check_dns: allow 'expected address' (-a) to be specified in CIDR notation (IPv4 only).
check_dns: allow for IPv6 RDNS
check_dns: Accept CIDR
check_dns: allow unsorted addresses
check_dns: allow forcing complete match of all addresses
check_apt: add --only-critical switch
check_apt: add -l/--list option to print packages
check_file_age: add range checking
check_file_age: enable to test for maximum file size
check_apt: adding packages-warning option
check_load: Adding top consuming processes option
check_http: Adding Proxy-Authorization and extra headers
check_snmp: make calcualtion of timeout value in help output more clear
check_uptime: new plugin for checking uptime to see how long the system is running
check_curl: check_http replacement based on libcurl
check_http: Allow user to specify HTTP method after proxy CONNECT
check_http: Add new flag --show-body/-B to print body
check_cluster: Added data argument validation
check_icmp: Add IPv6 support
check_icmp: Automatically detect IP protocol
check_icmp: emit error if multiple protocol version
check_disk: add support to display inodes usage in perfdata
check_hpjd: Added -D option to disable warning on 'out of paper'
check_http: support the --show-body/-B flag when --expect is used
check_mysql: allow mariadbclient to be used
check_tcp: add --sni
check_dns: detect unreachable dns service in nslookup output

Fixes

Fix regression where check_dhcp was rereading response in a tight loop
check_dns: fix error detection on sles nslookup
check_disk_smb: fix timeout issue
check_swap: repaired -n behaviour
check_icmp: Correctly set address_family on lookup
check_icmp: Do not overwrite -4,-6 on lookup
check_smtp: initializes n before it is used
check_dns: fix typo in parameter description
check_by_ssh: fix child process leak on timeouts
check_mysql: Allow sockets to be specified to -H
check_procs: improve command examples for 'at least' processes
check_disk: include -P switch in help
check_mailq: restore accidentially removed options

Version 2.2 Released

Tue, 29 Nov 2016 11:00:00 -0000

Version 2.2 Released

Holger Weiß, November 29, 2016

The Monitoring Plugins Development Team is proud to announce version 2.2 of the Monitoring Plugins! This release comes with various enhancements and fixes provided by more than thirty contributors. Many thanks to all of you!

For the list of notable changes in this release, see below.

You can get the tarball from our download page.

Enhancements

The check_http -S/--ssl option now accepts the arguments 1.1 and 1.2 to force TLSv1.1 and TLSv1.2 connections, respectively
The check_http -S/--ssl option now allows for specifying the desired protocol with a + suffix to also accept newer versions
Let check_http check HTTPS web sites via proxies
check_http: add timeout to performance data as max value
check_http: report certificate expiry date in UTC
check_snmp: add IPv6 support
check_snmp's performance data now also includes warning/critical thresholds
New check_snmp -N option to specify SNMPv3 context name
Let check_smtp's -D option imply -S
Let check_smtp's -e option match against the full SMTP response
check_dig: expected response is now case-insensitive
New check_mailq -s option which tells the plugin to use sudo(8)
New check_nt -l parameters: seconds|minutes|hours|days
New -W/-C option for check_ldap to check number of entries
check_users: add support for range thresholds
check_fping now auto-detects IPv6 addresses
check_radius now supports the radcli library
Support OpenSSL 1.1

Fixes

check_http: fix host header port handling
Let check_real terminate lines with CRLF when talking to the server, as mandated by RFC 2326
Fix check_procs on HP-UX
check_smtp's -e/--expect option can now be combined with -S/--starttls
Fix incorrect performance data thresholds emitted by check_ups
Don't let check_procs miss some processes on busy Solaris systems

Warnings

The format of the performance data emitted by check_mrtgtraf has been changed to comply with the development guidelines
check_ssh now returns CRITICAL for protocol/version errors
If a plugin is invoked with -h/--help or -V/--version, the exit status is now UNKNOWN
The superseeded check_ntp.pl was removed, please use check_ntp_peer or check_ntp_time instead

Version 2.1.2 Released

Fri, 16 Oct 2015 10:00:00 -0000

Version 2.1.2 Released

Holger Weiß, October 16, 2015

The Monitoring Plugins Development Team is proud to announce version 2.1.2 of the Monitoring Plugins!

This is a maintenance release that includes a number of bug fixes provided by eight different contributors. Many thanks to all of you!

Bug Squashing Sprint

Mon, 14 Sep 2015 10:00:00 -0000

Bug Squashing Sprint

Jan Wagner, September 14, 2015

We're going to have another "bug squashing sprint" on Friday, October 02. We will start after a morning coffee at 8 o'clock UTC. As last time the idea is to tackle a number of pull requests and bug reports in a joint effort, as that will be more fun than doing it all alone. Maybe we'll also have time to work on long-outstanding issues, depending on workload. Our main communication channel will be the #monitoring-plugins IRC room on freenode.

Anyone interested is welcome to join us! Development skills aren't required: Things like categorizing issues, testing fixes, and digging up entertaining xkcd comics will help a lot.

We're looking forward to meet and would be very happy to welcome you on Friday, October 02!

Version 2.1.1 Released

Tue, 02 Dec 2014 11:00:00 -0000

Version 2.1.1 Released

Holger Weiß, December 2, 2014

The Monitoring Plugins Development Team is proud to announce version 2.1.1 of the Monitoring Plugins!

This is a minor release on top of 2.1. It fixes a regression that broke check_ntp's jitter monitoring, and it includes a number of bug fixes contributed by Sebastian Herbszt. Kudos go to Sebastian for providing those!

Bug Squashing Sprint

Fri, 21 Nov 2014 11:00:00 -0000

Bug Squashing Sprint

Holger Weiß, November 21, 2014

We're going to have a "bug squashing sprint" on Friday, November 28. The idea is to tackle a number of pull requests and bug reports in a joint effort, as that will be more fun than doing it all alone. Our main communication channel will be the #monitoring-plugins IRC room on freenode.

Anyone interested is welcome to join us! Development skills aren't required: Things like categorizing issues, testing fixes, and digging up entertaining xkcd comics will help a lot.

We're looking forward to meet you on Friday!

Version 2.1 Released

Wed, 15 Oct 2014 10:00:00 -0000

Version 2.1 Released

Holger Weiß, October 15, 2014

The Monitoring Plugins Development Team is proud to announce version 2.1 of the Monitoring Plugins! This release comes with various enhancements and fixes provided by more than ten contributors. Many thanks to all of you!

For the list of notable changes in this release, see below.

You can get the tarball from our download page.

Enhancements

New check_hpjd -p option for port specification
New ./configure --with-qmail-qstat-command option to specify the path to qmail-qstat(8)
New check_ifstatus -n option to ignore interfaces by name
check_ntp_peer now has specific state output for each metric
New check_mysql -n option to ignore authentication failures
check_tcp now mentions IP address and port or socket name in error messages
New check_ntp_time -o option to add expected offset
In verbose mode, check_disk now shows which partitions actually cause an error state
check_dig now supports using the drill(1) tool
check_dig now supports the -6 option
check_file_age now emits performance data

Fixes

Fix check_jabber to work with Openfire servers
Fix bad string matching in check_oracle when testing TNS server
Fix check_ifstatus performance data output
Fix certificate expire time output
check_dns now verifies that the answer is coming from the queried server
Fix check_by_ssh to accept --hostname as argument

Warnings

This release doesn't ship with an RPM spec file, please contribute to PR #1283 if you are interested in it

Version 2.0 Released

Fri, 11 Jul 2014 10:00:00 -0000

Version 2.0 Released

Holger Weiß, July 11, 2014

The Monitoring Plugins Development Team is proud to announce the first release under the new project name: Version 2.0 of the Monitoring Plugins! This release comes with various enhancements and fixes provided by more than twenty contributors. Many thanks to all of you!

Let me also take the chance to welcome our newest team member, Sam Kottler. He already did lots of patch review for this release, and his expertise will no doubt help us a lot in the future, so we're really happy to have him on board!

One of the significant changes in the new release is that the Extra-Opts feature is now enabled by default. This lets you use a configuration file to specify plugin options. See the documentation for details.

For the list of other major changes in this release, see below. Note that a few of them might break certain configurations (hence the major version bump). Those are mentioned at the bottom of that list, so please be sure to check whether they might affect you.

You can get the tarball from our download page.

Enhancements

check_mailq now supports auto detection of qmail, postfix, exim and nullmailer with fallback to sendmail
check_ide_smart now defaults to plugin output, original output appended with -v
Extra-Opts are now enabled by default
check_swap now supports a configurable state when there is no swap
check_radius now supports the FreeRADIUS Client library
New check_mysql_query -f option to specify a client options file
New check_mysql_query -g option to specify a client options group
Add performance data to check_mysql_query
New check_file_age -i/--ignore-missing option to return OK on nonexistent files
Make check_ping, check_users, and check_disk work on Windows
New check_ssh -P option to specify the expected SSH protocol version
check_dns now emits the warning and critical thresholds with the performance data

Fixes

Don't let e.g. check_http's -C option reset SSL version if e.g. -S 1 -C 5 is specified
Don't have check_http's -N option expect an argument
check_ide_smart could disable offline auto-tests but could not re-enable them. For this reason all SMART command modes have been disabled
check_dig: fix wrong IPv6 arguments order (Stéphane Bortzmeyer)
check_dig: make sure not to give up too early when a timeout is specified with -t
check_log: don't stumble over log lines that include a % character
check_nt: add UPTIME to perfdata
Handle SNMPv3 noAuthNoPriv properly with check_snmp
Fix compilation with GnuTLS

Warnings

New default installation prefix: /usr/local instead of /usr/local/nagios
check_snmp now evaluates negative values properly, which means it might return CRITICAL in cases where it used to return OK. If this is undesired, the warning/critical threshold(s) must be fixed by specifying e.g. ~:100 instead of 100
check_procs now ignores its parent process to avoid unexpected results when invoked via certain shells
utils.sh no longer defines ECH
check_ide_smart -q/--quiet and -n/--nagios (Nagios-compatible output) are now deprecated but accepted for backward-compatibility
check_ide_smart -0/--auto-off, -1/--auto-on and -i/--immediate: options have been disabled because they were broken
State retention: the NAGIOS_PLUGIN_STATE_DIRECTORY environment variablew has been renamed MP_STATE_PATH. The old variable will continue to work in v2.0.x
Add the UID of the invoking user to the state retention file path. This helps solving permission issues when different users run the same plugin
check_swap used to allow returning OK on a system without swap when only percent thresholds were used. This is no longer the case and one must now use -n/--no-swap=<state>
The Perl and Shell plugins now use the PATH specified via ./configure's --trusted-path option, or /usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin by default

New Project Name: Monitoring Plugins

Wed, 15 Jan 2014 11:00:00 -0000

New Project Name: Monitoring Plugins

Holger Weiß, January 15, 2014

In the past, the domain nagios-plugins.org pointed to a server independently maintained by us, the Nagios Plugins Development Team. Today, the DNS records were modified to point to web space controlled by Nagios Enterprises instead. This change was done without prior notice.

This means the project can no longer use the name "Nagios Plugins". We, the Nagios Plugins Development Team, therefore renamed the Nagios Plugins to Monitoring Plugins.

We're not too happy having to make this move. Renaming the project will lead to some confusion, and to quite a bit of work for others and for ourselves. We would've preferred to save everyone this trouble.

However, we do like how the new name indicates that our plugins are also used with various other monitoring applications these days. While the Nagios folks created the original implementation of the core plugins bundle, an independent team has taken over development more than a decade ago, and the product is intended to be useful for all users, including, but not limited to, the customers of Nagios Enterprises.

It'll probably take us a few days to sort out various issues caused by the new project name, but we're confident that we can resume our development work towards the next stable releases very soon.

We'd like to take the chance to thank you, our community, for your countless contributions, which made the plugins what they are today. You guys are awesome. We're looking forward to the next chapter of Monitoring Plugins development, and we hope you are, too!

Version 1.5 Released

Wed, 02 Oct 2013 10:00:00 -0000

Version 1.5 Released

Holger Weiß, October 2, 2013

The Nagios Plugins Development Team is proud to announce version 1.5 of the Nagios Plugins! This release comes with the new check_dbi plugin written by Sebastian Harl, and includes lots of enhancements and fixes provided by more than forty contributors. Many thanks to all of you!

Special kudos go to Sven Nierlein for fixing numerous bugs, reviewing many pull requests, bringing our test suite back into shape, and setting up automated tests on a variety of platforms. This helped us spotting lots of bugs before the release. Let me also thank Ton Voon for doing the unenviable work of updating the bundled Perl modules; and our newest team member Jan Wagner for all his help with patch review.

See below for a list of major changes. Note that the new check_http version introduces two minor backwards incompatibilities mentioned at the end of that list, so please be sure to check whether they might affect you.

You can get the tarball from our download page.

Enhancements

New check_dbi plugin for checking an (SQL) database using DBI
Let OpenSSL load its configuration file (see the OPENSSL_config(3) man page)
Add performance data to check_apt
Add performance data to check_procs
Added -4/-6 options to check_dig
New check_oracle --connect option to perform real login
New check_nagios -t option to override the default timeout
New check_disk -f/--freespace-ignore-reserved option to ignore space reserved for root
New check_disk -N/--include-type option to limit the filesystem types to check
Allow for building the plugins in parallel
Add --without-{dbi,ldap,radius} options to ./configure
Made Verbose output of check_sensors compliant
New switch -E/--extended-perfdata for check_http to print additional performance data
New check_http -d option to specify a string to expect within the response headers
New check_http -J/-K options for client certificate authentication support
Add support for executing queries to check_pgsql
Let check_pgsql accept a UNIX socket directory as hostname
New check_pgsql -o option to specify additional connection parameters
New check_fping -S option to specify the source IP address
New check_fping -I option to specify the interface to bind to
Let check_fping support IPv6
New check_procs -k option to ignore kernel threads (on Linux)
Let check_procs use /proc/<PID>/exe (if available) instead of getpid(2), unless -T is specified
Let check_mysql support SSL
Let check_mysql add perfromance metrics for all checks
New check_mysql -f option to specify a client options file
New check_mysql -g option to specify a client options group
New check_snmp --offset option to allow for adding/substracting an offset value to sensor data
Let check_snmp support an arbitrary number of OIDs
Let check_ide_smart support NetBSD

Fixes

Change the MAIL FROM command generated by check_smtp to be RFC compliant
Fix compilation of check_http without SSL support
Fix check_snmp reversed threshold ranges (backward-compatibility)
Fix check_snmp memory violation when using more than 8 OIDs
Fix check_apt security regular expression
Fix check_http handling extra header (-k) containing semicolons
Fix check_apt handling unknown exit codes from apt-get
Fix deprecated imports of check_nmap.py

Warnings

check_http behaviour of -k/--header changed since it does not separate multiple headers by semicolons anymore. Use multiple -k switches instead.
check_http's --proxy_authorization option is now called --proxy-authorization (it was always documented this way)
The contrib directory has been removed. These days, sites such as Nagios Exchange and Monitoring Exchange serve as much better places for publishing plugins not maintained by the Nagios Plugins Development Team.

Version 1.4.16 Released

Wed, 27 Jun 2012 10:00:00 -0000

Version 1.4.16 Released

Holger Weiß, June 27, 2012

The Nagios Plugins Development Team is proud to announce a new release of the Nagios Plugins! This release contains several enhancements and bug fixes. Many thanks to all the contributors who raised issues or provided patches.

You can get the tarball from: https://sourceforge.net/projects/nagiosplug/files/

Enhancements

check_nt UPTIME accepts warning/critical thresholds
check_disk_smb now allows spaces in share names
check_http now uses standard threshold functions (enables floating point and ranges)
check_http now checks for and prints the certificate cn (hostname) in SSL certificate checks
check_http now supports an optional -S/--ssl value to choose the SSL protocol version
Add perfdata to check_ssh
New option to check_smtp to ignore failures when sending QUIT
New check_by_ssh -F option which allows for specifying an alternative ssh_config(5) file
check_sensors now detects faulty sensors unless --ignore-fault is specified
utils.sh now provides a check_range function
Improved the performance of check_users
Add perfdata to check_disk_smb
Updated Nagios::Plugin perl module
Add warning threshold to certificate expiration checks of check_tcp/http/smtp
Add --perf-oids option for check_snmp

Fixes

Fix check_disk free space calculation if blocksizes differ within a disk group
check_disk_smb now handles NT_STATUS_ACCESS_DENIED properly
Make check_snmp work more like v1.4.14 with regard to using special values (Timeticks, STRING) as numeric thresholds
Fix check_ldap overriding the port when --ssl was specified after -p
Fix check_procs where regex input of '|' would get displayed in output - now replaced with ','
Fix segfault in check_host when hostname returns multiple IP addresses
Fix check_smtp and check_tcp where duplicate messages were displayed for certificate errors
Fix check_ping's parsing of ping6(1) output
Fix a check_dhcp bug which was triggered by checking Windows 2003 DHCP servers
Disable RFC4507 support, to work around SSL negotiation issues with (at least) some Tomcat versions
Fix performance data label containing spaces in check_snmp

Ton Voon Resigns as Team Leader

Fri, 04 Nov 2011 11:00:00 -0000

Ton Voon Resigns as Team Leader

Ton Voon, November 4, 2011

Due to personal reasons, I am resigning from being the team leader for the Nagios Plugins.

It's almost 7 years to the day since I started as team leader and I've been honoured to have had a great team of people that have helped with coding and translations and responding to the mailing lists. I'm particularly proud of the Nagios::Plugin perl module, originally created by Gavin Carr, and some of the fantastic tests added into the plugins code, started by Nathan Vonnahme. Also Benoit Mortier did a great job on setting up the translations framework. I also recall, when I first joined the team 9 years ago, racing with Matthew Kent to get the most CVS commits!

Other team members that have contributed over my tenure include Peter Bray, Sean Finney, Ethan Galstad, Subhendu Ghosh, Stanley Hopcroft, Harper Mann and Michael Wirtgen - thanks to all of them for their valuable time to make the Nagios Plugins better.

I especially want to thank Thomas Guyot-Sionnest, Matthias Eble and Holger Weiss. Not only have they spent the most hours improving all aspects of this project (the gnulib integration is just awesome!), but they've been the best guys to work with: thanks for keeping me sane, encouraging me when you think I am right and for being honest enough to tell me when I am wrong. I owe you all a big drink next time we meet.

Thanks to all the great community contributions and all the email messages that have provoked, inspired and enlightened.

Holger will be taking over the responsibility of team leader in the next chapter of the Nagios Plugins.

Regards,
Ton

Domain Name Transfer

Sun, 25 Sep 2011 10:00:00 -0000

Domain Name Transfer

Ton Voon, September 25, 2011

The domain names for the Nagios Plugins website will be transferred to Nagios Enterprises, as this project is owned by Nagios Enterprises. The project will continue to be independently run and managed by the Nagios Plugins Development Team.

Version 1.4.15 Released

Tue, 27 Jul 2010 10:00:00 -0000

Version 1.4.15 Released

Ton Voon, July 27, 2010

The Nagios Plugin Development Team are proud to announce the latest Nagios Plugins release. This release contains several enhancements, including rate calculation in check_snmp. There are also lots of bug fixes. Thanks to all the contributors who raised issues or provided patches.

You can get the tarball from: https://sourceforge.net/projects/nagiosplug/files/

Enhancements

New check_ntp_peer -m and -n options to check the number of usable time sources ("truechimers")
New check_disk_smb -a option which allows for specifying the IP address of the remote server
New check_radius -N option which allows for specifying the value of the NAS-IP-Address attribute
New check_snmp --rate option to store differences between invocations. Saves state in PREFIX/var/{plugin}
check_snmp -l label option now also changes the perfdata label. See Warnings
check_snmp has an --invert-search option which reverses status of the string and regexp searches
check_http now displays the missing search string and the URL in the output when failed
Updated Nagios::Plugin perl module
Updated gnulib to June 2010

Fixes

Fix check_ircd binding to wrong interface
Add proxy-authorization option to check_http
check_icmp now increment the sequence counter in each packet
Fix usage of repeated -o options in check_snmp
Try to detect arguments passed via --with-ping[6]-command and set options accordingly
Fix memory leak in check_http for large pages
Fix compilation with GCC 2.96
Fix regression introduced in #1867716 where partially valid performance strings would not be printed anymore
Fix regression in check_http ssl checks on some servers - make SNI an option
Fix guest mode support in check_disk_smb
Fix check_disk_smb and check_ircd failures when run via ePN
check_ldap now allows for specifying an empty LDAP base
Fix compilation error of pst3 in Solaris 8
Fix check_radius returning OK on unexpected results
Fix translations when extra-opts aren't enabled
Fix parsing of multi-line strings in check_snmp (broken in 1.4.14) and enhance output in such case
Fix detection of pst3 64-bit compile flags with Sun CC
Fix cmd_run overwriting the environment, which would break some commands that needed it
Allow check_ifstatus to accept version=2c - used to only allow version=2 (Brian Landers)
Fix examples in check_disk, where it implied was possible to suffix unit values to warn/crit parameters

Warnings

Updated developer documentation to say that performance labels should not have an equals sign or single quote in the label
check_http 1.4.14 introduced SSL SNI support - you now have to enable it explicitly with --sni
check_snmp -l label option is also used for the performance label. This could change history from previous uses