4 Zabbix agent 2 (UNIX)

Overview

Zabbix agent 2 is a new generation of Zabbix agent and may be used in place of Zabbix agent.

This section lists parameters supported in a Zabbix agent 2 configuration file (zabbix_agent2.conf). Note that:

  • The default values reflect process defaults, not the values in the shipped configuration files;
  • Zabbix supports configuration files only in UTF-8 encoding without BOM;
  • Comments starting with “#” are only supported in the beginning of the line.

Parameters

ParameterMandatoryRangeDefaultDescription
AliasnoSets an alias for an item key. It can be used to substitute long and complex item key with a smaller and simpler one.
Multiple Alias parameters may be present. Multiple parameters with the same Alias key are allowed.
Different Alias keys may reference the same item key.
Aliases can be used in HostMetadataItem but not in HostnameItem parameters.

Examples:

1. Retrieving the ID of user ‘zabbix’.
Alias=zabbix.userid:vfs.file.regexp[/etc/passwd,”^zabbix:.:([0-9]+)”,,,,\1]
Now shorthand key zabbix.userid may be used to retrieve data.

2. Getting CPU utilization with default and custom parameters.
Alias=cpu.util:system.cpu.util
Alias=cpu.util[]:system.cpu.util[]
This allows use cpu.util key to get CPU utilization percentage with default parameters as well as use cpu.util[all, idle, avg15] to get specific data about CPU utilization.

3. Running multiple low-level discovery rules processing the same discovery items.
Alias=vfs.fs.discovery[]:vfs.fs.discovery
Now it is possible to set up several discovery rules using vfs.fs.discovery with different parameters for each rule, e.g., vfs.fs.discovery[foo], vfs.fs.discovery[bar], etc.
AllowKeynoAllow execution of those item keys that match a pattern. Key pattern is a wildcard expression that supports ““ character to match any number of any characters.
Multiple key matching rules may be defined in combination with DenyKey. The parameters are processed one by one according to their appearance order.
This parameter is supported since Zabbix 5.0.0.
See also: Restricting agent checks.
BufferSendno1-36005The time interval in seconds which determines how often values are sent from the buffer to Zabbix server.
Note, that if the buffer is full, the data will be sent sooner.
BufferSizeno2-65535100Maximum number of values in a memory buffer. The agent will send all collected data to Zabbix server or proxy if the buffer is full.
This parameter should only be used if persistent buffer is disabled (EnablePersistentBuffer=0).
ControlSocketno/tmp/agent.sockThe control socket, used to send runtime commands with ‘-R’ option.
DebugLevelno0-53Specifies debug level:
0 - basic information about starting and stopping of Zabbix processes
1 - critical information
2 - error information
3 - warnings
4 - for debugging (produces lots of information)
5 - extended debugging (produces even more information)
DenyKeynoDeny execution of those item keys that match a pattern. Key pattern is a wildcard expression that supports ““ character to match any number of any characters.
Multiple key matching rules may be defined in combination with AllowKey. The parameters are processed one by one according to their appearance order.
This parameter is supported since Zabbix 5.0.0.
See also: Restricting agent checks.
EnablePersistentBufferno0-10Enable usage of local persistent storage for active items.
0 - disabled
1 - enabled
If persistent storage is disabled, the memory buffer will be used.
HostInterfaceno0-255 charactersOptional parameter that defines host interface.
Host interface is used at host autoregistration process.
An agent will issue an error and not start if the value is over the limit of 255 characters.
If not defined, value will be acquired from HostInterfaceItem.
Supported since Zabbix 4.4.0.
HostInterfaceItemnoOptional parameter that defines an item used for getting host interface.
Host interface is used at host autoregistration process.
During an autoregistration request an agent will log a warning message if the value returned by specified item is over limit of 255 characters.
This option is only used when HostInterface is not defined.
Supported since Zabbix 4.4.0.
HostMetadatano0-255 charactersOptional parameter that defines host metadata. Host metadata is used at host autoregistration process.
An agent will issue an error and not start if the specified value is over the limit or a non-UTF-8 string.
If not defined, the value will be acquired from HostMetadataItem.
HostMetadataItemnoOptional parameter that defines an item used for getting host metadata. Host metadata item value is retrieved on each autoregistration attempt for host autoregistration process.
During an autoregistration request an agent will log a warning message if the value returned by the specified item is over the limit of 255 characters.
This option is only used when HostMetadata is not defined.
Supports UserParameters and aliases. Supports system.run[] regardless of AllowKey/DenyKey values.
The value returned by the item must be a UTF-8 string otherwise it will be ignored.
HostnamenoSet by HostnameItemList of comma-delimited unique, case-sensitive hostnames.
Required for active checks and must match hostnames as configured on the server. Value is acquired from HostnameItem if undefined.
Allowed characters: alphanumeric, ‘.’, ‘ ‘, ‘_’ and ‘-‘.
Maximum length: 128 characters per hostname, 2048 characters for the entire line.
HostnameItemnosystem.hostnameItem used for generating Hostname if it is not defined. Ignored if Hostname is defined.
Does not support UserParameters or aliases, but does support system.run[] regardless of AllowKey/DenyKey values.
The output length is limited to 512KB.
IncludenoYou may include individual files or all files in a directory in the configuration file.
During the installation Zabbix will create the include directory in /usr/local/etc, unless modified during the compile time.
To only include relevant files in the specified directory, the asterisk wildcard character is supported for pattern matching. For example: /absolute/path/to/config/files/.conf.
Since Zabbix 6.0.0 a path can be relative to zabbix_agent2.conf file location.
See special notes about limitations.
ListenIPno0.0.0.0List of comma-delimited IP addresses that the agent should listen on.
The first IP address is sent to Zabbix server, if connecting to it, to retrieve the list of active checks.
ListenPortno1024-3276710050Agent will listen on this port for connections from the server.
LogFileyes, if LogType is set to file, otherwise
no		/tmp/zabbix_agent2.logLog file name if LogType is ‘file’.
LogFileSizeno0-10241Maximum size of log file in MB.
0 - disable automatic log rotation.
Note: If the log file size limit is reached and file rotation fails, for whatever reason, the existing log file is truncated and started anew.
LogTypenofileSpecifies where log messages are written to:
system - syslog,
file - file specified by LogFile parameter,
console - standard output.
PersistentBufferFilenoThe file, where Zabbix Agent2 should keep SQLite database.
Must be a full filename.
This parameter is only used if persistent buffer is enabled (EnablePersistentBuffer=1).
PersistentBufferPeriodno1m-365d1hThe time period for which data should be stored, when there is no connection to the server or proxy. Older data will be lost. Log data will be preserved.
This parameter is only used if persistent buffer is enabled (EnablePersistentBuffer=1).
PidFileno/tmp/zabbix_agent2.pidName of PID file.
PluginsnoSince Zabbix 6.0.0 most of the plugins have their own configuration files. The agent configuration file contains plugin parameters listed below.
Plugins.Log.MaxLinesPerSecondno1-100020Maximum number of new lines the agent will send per second to Zabbix server or proxy when processing ‘log’ and ‘eventlog’ active checks.
The provided value will be overridden by the parameter ‘maxlines’,
provided in ‘log’ or ‘eventlog’ item key.
Note: Zabbix will process 10 times more new lines than set in MaxLinesPerSecond to seek the required string in log items.
This parameter is supported since 4.4.2 and replaces MaxLinesPerSecond.
Plugins.SystemRun.LogRemoteCommandsno0Enable logging of executed shell commands as warnings.
0 - disabled
1 - enabled
Commands will be logged only if executed remotely. Log entries will not be created if system.run[] is launched locally by HostMetadataItem, HostInterfaceItem or HostnameItem parameters.
This parameter is supported since 4.4.2 and replaces LogRemoteCommands.
RefreshActiveChecksno60-3600120How often the list of active checks is refreshed, in seconds.
Note that after failing to refresh active checks the next refresh will be attempted after 60 seconds.
ServeryesList of comma-delimited IP addresses, optionally in CIDR notation, or DNS names of Zabbix servers and Zabbix proxies.
Incoming connections will be accepted only from the hosts listed here.
If IPv6 support is enabled then ‘127.0.0.1’, ‘::ffff:127.0.0.1’ are treated equally and ‘::/0’ will allow any IPv4 or IPv6 address.
‘0.0.0.0/0’ can be used to allow any IPv4 address.
Example: Server=127.0.0.1,192.168.1.0/24,::1,2001:db8::/32,zabbix.example.com
Spaces are allowed.
ServerActivenoList of comma-delimited IP address or DNS name (address:port) pairs or clusters (address:port;address2:port) of Zabbix servers and Zabbix proxies for active checks.
Cluster nodes must be separated by a semicolon.
Multiple comma-delimited addresses can be provided to use several independent Zabbix servers in parallel. Spaces are allowed.
If port is not specified, default port is used.
IPv6 addresses must be enclosed in square brackets if port for that host is specified.
If port is not specified, square brackets for IPv6 addresses are optional.
If this parameter is not specified, active checks are disabled.
Example for multiple servers:
ServerActive=127.0.0.1:20051,zabbix.domain,[::1]:30051,::1,[12fc::1]
Example for high availability:
ServerActive=zabbix.cluster.node1;zabbix.cluster.node2:20051;zabbix.cluster.node3
Example for high availability with two clusters and one server:
ServerActive=zabbix.cluster.node1;zabbix.cluster.node2:20051,zabbix.cluster2.node1;zabbix.cluster2.node2,zabbix.domain
SourceIPnoSource IP address for:
- outgoing connections to Zabbix server or Zabbix proxy;
- making connections while executing some items (web.page.get, net.tcp.port, etc.)
StatusPortno1024-32767If set, agent will listen on this port for HTTP status requests (http://localhost:<port>/status).
Timeoutno1-303Spend no more than Timeout seconds on processing.
TLSAcceptyes, if TLS certificate or PSK parameters are defined (even for unencrypted connection), otherwise noWhat incoming connections to accept. Used for a passive checks. Multiple values can be specified, separated by comma:
unencrypted - accept connections without encryption (default)
psk - accept connections with TLS and a pre-shared key (PSK)
cert - accept connections with TLS and a certificate
TLSCAFilenoFull pathname of a file containing the top-level CA(s) certificates for peer certificate verification, used for encrypted communications between Zabbix components.
TLSCertFilenoFull pathname of a file containing the agent certificate or certificate chain, used for encrypted communications with Zabbix components.
TLSConnectyes, if TLS certificate or PSK parameters are defined (even for unencrypted connection), otherwise noHow the agent should connect to Zabbix server or proxy. Used for active checks. Only one value can be specified:
unencrypted - connect without encryption (default)
psk - connect using TLS and a pre-shared key (PSK)
cert - connect using TLS and a certificate
TLSCRLFilenoFull pathname of a file containing revoked certificates. This parameter is used for encrypted communications with Zabbix components.
TLSKeyFilenoFull pathname of a file containing the agent private key used for encrypted communications with Zabbix components.
TLSPSKFilenoFull pathname of a file containing the agent pre-shared key used for encrypted communications with Zabbix components.
TLSPSKIdentitynoPre-shared key identity string, used for encrypted communications with Zabbix server.
TLSServerCertIssuernoAllowed server (proxy) certificate issuer.
TLSServerCertSubjectnoAllowed server (proxy) certificate subject.
UnsafeUserParametersno0,10Allow all characters to be passed in arguments to user-defined parameters.
The following characters are not allowed:
\ ‘ “ ` * ? [ ] { } ~ $ ! & ; ( ) < > | # @
Additionally, newline characters are not allowed.
UserParameternoUser-defined parameter to monitor. There can be several user-defined parameters.
Format: UserParameter=<key>,<shell command>
Note that shell command must not return empty string or EOL only.
Shell commands may have relative paths, if UserParameterDir parameter is specified.
Examples:
UserParameter=system.test,who|wc -l
UserParameter=check_cpu,./custom_script.sh
UserParameterDirnoDefault search path for UserParameter commands. If used, the agent will change its working directory to the one specified here before executing a command. Thereby, UserParameter commands can have a relative ./ prefix instead of a full path.
Only one entry is allowed.
Example: UserParameterDir=/opt/myscripts