韓誥傭痔

Table of Contents

7 Probl豕mes connus

7 Probl豕mes connus

唬棗娶娶谷梭硃喧勳棗紳 d＊谷v谷nements

Les 谷v谷nements peuvent ne pas 那tre corr谷l谷s correctement si l'intervalle de temps entre le premier et le deuxi豕me 谷v谷nement est trop petit, c'est-角-dire une demi-seconde et moins.

V谷rifications IPMI

Les v谷rifications IPMI ne fonctionneront pas avec le paquet de la biblioth豕que standard OpenIPMI sur Debian avant 9 (stretch) et Ubuntu avant 16.04 (xenial). Pour r谷soudre ce 梯娶棗莉梭豕鳥梗, recompilez la biblioth豕que OpenIPMI avec OpenSSL activ谷 comme indiqu谷 dans .

Upgrade

SQL mode setting for successful upgrade

The sql_mode setting in MySQL/MariaDB must have the "STRICT_TRANS_TABLES" mode set. If it is absent, the 韓誥傭痔 database upgrade will fail (see also ).

V谷rifications SSH

Certaines distributions Linux comme Debian et Ubuntu ne supportent pas les cl谷s priv谷es crypt谷es (avec phrase secr豕te) si la biblioth豕que libssh2 est install谷e 角 partir des packages. Voir pour plus de d谷tails.

V谷rifications ODBC

Le serveur 韓誥傭痔 ou le proxy qui utilise MySQL comme base de donn谷es peut ou ne peut pas fonctionner correctement avec la biblioth豕que MySQL ODBC en raison d'un . Voir pour plus d'informations et les solutions de contournement disponibles.

Les donn谷es XML interrog谷es 角 partir de Microsoft SQL Server peuvent 那tre tronqu谷es 角 2033 caract豕res en raison d'un Microsoft.

V谷rifications HTTPS

Les sc谷narios Web utilisant le protocole https et les v谷rifications d'agent 韓誥傭痔 紳梗喧.喧釵梯.莽梗娶措勳釵梗啊堯喧喧梯莽＃敕 et 紳梗喧.喧釵梯.莽梗娶措勳釵梗.梯梗娶款啊堯喧喧梯莽＃敕 peuvent 谷chouer si le serveur cible est configur谷 pour interdire le protocole TLS v1.0 ou inf谷rieur. Voir pour plus d'informations et les solutions de contournement disponibles.

Web monitoring and HTTP agent

韓誥傭痔 server leaks memory on CentOS 6, CentOS 7 and possibly other related Linux distributions due to an when "SSL verify peer" is enabled in web scenarios or HTTP agent. Please see for more information and available workarounds.

V谷rifications Simples

Un bug existe dans les versions de fping ant谷rieures 角 la version v3.10 release 2.1.2 qui traite mal les paquets echo replay dupliqu谷s. Cela peut provoquer des r谷sultats inattendus pour les 谷l谷ments icmpping, icmppingloss, icmppingsec. Il est recommand谷 d'utiliser la derni豕re version de fping. Voir pour plus de d谷tails.

V谷rifications SNMP

Si le syst豕me d'exploitation OpenBSD est utilis谷, un bug dans la biblioth豕que Net-SNMP jusqu'角 la version 5.7.3 peut provoquer un plantage du serveur 韓誥傭痔 si le param豕tre SourceIP est d谷fini dans le fichier de configuration du serveur 韓誥傭痔. Pour contourner le 梯娶棗莉梭豕鳥梗, ne d谷finissez pas le param豕tre SourceIP. Le m那me 梯娶棗莉梭豕鳥梗 s'applique 谷galement 角 Linux, mais cela n'emp那che pas le serveur 韓誥傭痔 de fonctionner. Un correctif local pour le package net-snmp sur OpenBSD a 谷t谷 appliqu谷 et sera publi谷 avec OpenBSD 6.3.

Probl豕me de compatibilit谷 avec PHP 7.0

Il a 谷t谷 observ谷 qu'avec PHP 7.0, l'importation d'un mod豕le avec des d谷clencheurs de surveillance Web peut 谷chouer en raison de l'ajout incorrect de doubles guillemets aux 谷l谷ments de surveillance Web dans les expressions de d谷clencheur. Le 梯娶棗莉梭豕鳥梗 dispara?t lors de la mise 角 jour de PHP vers la version 7.1.

Graphiques

Les modifications apport谷es 角 l'heure d'谷t谷 (DST) entra?nent des irr谷gularit谷s lors de l'affichage des libell谷s de l'axe X (duplicat de date, date manquante, etc.).

Supervision de fichier journaux

Les 谷l谷ments log[] et logrt[] relisent de mani豕re r谷p谷t谷e le fichier de logs depuis le d谷but si le syst豕me de fichiers est plein 角 100% et que de nouvelles entr谷es sont ajout谷es au fichier journal (voir pour plus d'informations).

Requ那tes MySQL lentes

Le serveur 韓誥傭痔 g谷n豕re des requ那tes SELECT lentes en cas de valeurs non existantes pour les 谷l谷ments. Ceci est d? 角 un connu dans les versions MySQL 5.6/5.7. Une solution de contournement consiste 角 d谷sactiver l'optimiseur index_condition_pushdown dans MySQL. Pour une discussion approfondie, voir .

API

Le param豕tre de sortie ne fonctionne pas correctement avec la 鳥谷喧堯棗餃梗 history.get.

Acc豕s API

Un grand nombre de sessions utilisateur ouvertes peuvent 那tre cr谷谷es lors de l'utilisation de scripts personnalis谷s avec la 鳥谷喧堯棗餃梗 user.login sans la pr谷sence du param豕tre user.logout ensuite.

Simple checks

There is a bug in fping versions earlier than v3.10 that mishandles duplicate echo replay packets. This may cause unexpected results for icmpping, icmppingloss, icmppingsec items. It is recommended to use the latest version of fping. Please see for more details.

SNMP checks

If the OpenBSD operating system is used, a use-after-free bug in the Net-SNMP library up to the 5.7.3 version can cause a crash of 韓誥傭痔 server if the SourceIP parameter is set in the 韓誥傭痔 server configuration file. As a workaround, please do not set the SourceIP parameter. The same problem applies also for Linux, but it does not cause 韓誥傭痔 server to stop working. A local patch for the net-snmp package on OpenBSD was applied and will be released with OpenBSD 6.3.

SNMP data spikes

Spikes in SNMP data have been observed that may be related to certain physical factors like voltage spikes in the mains. See more details.

SNMP traps

The "net-snmp-perl" package, needed for SNMP traps, has been removed in RHEL/CentOS 8.0-8.2; re-added in RHEL 8.3.

So if you are using RHEL 8.0-8.2, the best solution is to upgrade to RHEL 8.3; if you are using CentOS 8.0-8.2, you may wait for CentOS 8.3 or use a package from EPEL.

Please also see for more information.

Alerter process crash in Centos/RHEL 7

Instances of a 韓誥傭痔 server alerter process crash have been encountered in Centos/RHEL 7. Please see for details.

Compiling 韓誥傭痔 agent on HP-UX

If you install the PCRE library from a popular HP-UX package site , for example from file pcre-8.42-ia64_64-11.31.depot, you get only the 64-bit version of the library installed in the /usr/local/lib/hpux64 directory.

In this case, for successful agent compilation customized options need to be used for the "configure" script, e.g.:

CFLAGS="+DD64" ./configure --enable-agent --with-libpcre-include=/usr/local/include --with-libpcre-lib=/usr/local/lib/hpux64

Flipping frontend locales

It has been observed that frontend locales may flip without apparent logic, i. e. some pages (or parts of pages) are displayed in one language while other pages (or parts of pages) in a different language. Typically the problem may appear when there are several users, some of whom use one locale, while others use another.

A known workaround to this is to disable multithreading in PHP and Apache.

The problem is related to how setting the locale works : locale information is maintained per process, not per thread. So in a multi-thread environment, when there are several projects run by same Apache process, it is possible that the locale gets changed in another thread and that changes how data can be processed in the 韓誥傭痔 thread.

For more information, please see related problem reports:

(Problem with flipping frontend locales)
(Problem with number processing in graphs using the bcdiv function of BC Math functions)

PHP 7.3 opcache configuration

If "opcache" is enabled in the PHP 7.3 configuration, 韓誥傭痔 frontend may show a blank screen when loaded for the first time. This is a registered . To work around this, please set the "opcache.optimization_level" parameter to 0x7FFFBFDF in the PHP configuration (php.ini file).

Graphs

Changes to Daylight Saving Time (DST) result in irregularities when displaying X axis labels (date duplication, date missing, etc).

Log file monitoring

log[] and logrt[] items repeatedly reread log file from the beginning if file system is 100% full and the log file is being appended (see for more information).

Slow MySQL queries

韓誥傭痔 server generates slow select queries in case of non-existing values for items. This is caused by a known in MySQL 5.6/5.7 versions. A workaround to this is disabling the index_condition_pushdown optimizer in MySQL. For an extended discussion, see .

A large number of open user sessions can be created when using custom scripts with the user.login method without a following user.logout.

IPv6 address issue in SNMPv3 traps

Due to a net-snmp bug, IPv6 address may not be correctly displayed when using SNMPv3 in SNMP traps. For more details and a possible workaround, see .

A failed login attempt message will display only the first 39 characters of a stored IP address as that's the character limit in the database field. That means that IPv6 IP addresses longer than 39 characters will be shown incompletely.

韓誥傭痔 agent checks on Windows

Non-existing DNS entries in a Server parameter of 韓誥傭痔 agent configuration file (zabbix_agentd.conf) may increase 韓誥傭痔 agent response time on Windows. This happens because Windows DNS caching daemon doesn't cache negative responses for IPv4 addresses. However, for IPv6 addresses negative responses are cached, so a possible workaround to this is disabling IPv4 on the host.

YAML export/import

There are some known issues with YAML export/import:

Error messages are not translatable;
Valid JSON with a .yaml file extension sometimes cannot be imported;
Unquoted human-readable dates are automatically converted to Unix timestamps.

Setup wizard on SUSE with NGINX and php-fpm

Frontend setup wizard cannot save configuration file on SUSE with NGINX + php-fpm. This is caused by a setting in /usr/lib/systemd/system/php-fpm.service unit, which prevents 韓誥傭痔 from writing to /etc. (introduced in ).

There are two workaround options available:

Set the option to 'true' instead of 'full' in the php-fpm systemd unit.
Manually save /etc/zabbix/web/zabbix.conf.php file.

Chromium for 韓誥傭痔 web service on Ubuntu 20

Though in most cases, 韓誥傭痔 web service can run with Chromium, on Ubuntu 20.04 using Chromium causes the following error:

Cannot fetch data: chrome failed to start:cmd_run.go:994:
       WARNING: cannot create user data directory: cannot create 
       "/var/lib/zabbix/snap/chromium/1564": mkdir /var/lib/zabbix: permission denied
       Sorry, home directories outside of /home are not currently supported. See https://forum.snapcraft.io/t/11209 for details.

This error occurs because /var/lib/zabbix is used as a home directory of user 'zabbix'.

MySQL custom error codes

If 韓誥傭痔 is used with MySQL installation on Azure, an unclear error message [9002] Some errors occurred may appear in 韓誥傭痔 logs. This generic error text is sent to 韓誥傭痔 server or proxy by the database. To get more information about the cause of the error, check Azure logs.