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syslog-ng Open Source Edition 3.38 - Administration Guide

Preface Introduction to syslog-ng The concepts of syslog-ng Installing syslog-ng The syslog-ng OSE quick-start guide The syslog-ng OSE configuration file source: Read, receive, and collect log messages
How sources work default-network-drivers: Receive and parse common syslog messages internal: Collecting internal messages file: Collecting messages from text files wildcard-file: Collecting messages from multiple text files kubernetes: Collecting and parsing the Kubernetes CRI (Container Runtime Interface) format linux-audit: Collecting messages from Linux audit logs mqtt: receiving messages from an MQTT broker network: Collecting messages using the RFC3164 protocol (network() driver) nodejs: Receiving JSON messages from nodejs applications mbox: Converting local email messages to log messages osquery: Collect and parse osquery result logs pipe: Collecting messages from named pipes pacct: Collecting process accounting logs on Linux program: Receiving messages from external applications python: writing server-style Python sources python-fetcher: writing fetcher-style Python sources snmptrap: Read Net-SNMP traps sun-streams: Collecting messages on Sun Solaris syslog: Collecting messages using the IETF syslog protocol (syslog() driver) system: Collecting the system-specific log messages of a platform systemd-journal: Collecting messages from the systemd-journal system log storage systemd-syslog: Collecting systemd messages using a socket tcp, tcp6, udp, udp6: Collecting messages from remote hosts using the BSD syslog protocol— OBSOLETE unix-stream, unix-dgram: Collecting messages from UNIX domain sockets stdin: Collecting messages from the standard input stream
destination: Forward, send, and store log messages
amqp: Publishing messages using AMQP collectd: sending metrics to collectd discord: Sending alerts and notifications to Discord elasticsearch2: Sending messages directly to Elasticsearch version 2.0 or higher (DEPRECATED) elasticsearch-http: Sending messages to Elasticsearch HTTP Bulk API file: Storing messages in plain-text files graphite: Sending metrics to Graphite Sending logs to Graylog hdfs: Storing messages on the Hadoop Distributed File System (HDFS) Posting messages over HTTP http: Posting messages over HTTP without Java kafka: Publishing messages to Apache Kafka (Java implementation) kafka-c(): Publishing messages to Apache Kafka using the librdkafka client (C implementation) loggly: Using Loggly logmatic: Using Logmatic.io mongodb(): Storing messages in a MongoDB database mqtt() destination: sending messages from a local network to an MQTT broker network: Sending messages to a remote log server using the RFC3164 protocol (network() driver) osquery: Sending log messages to osquery's syslog table pipe: Sending messages to named pipes program: Sending messages to external applications pseudofile() python: writing custom Python destinations redis: Storing name-value pairs in Redis riemann: Monitoring your data with Riemann slack: Sending alerts and notifications to a Slack channel smtp: Generating SMTP messages (email) from logs snmp: Sending SNMP traps Splunk: Sending log messages to Splunk sql: Storing messages in an SQL database stomp: Publishing messages using STOMP Sumo Logic destinations: sumologic-http() and sumologic-syslog() syslog: Sending messages to a remote logserver using the IETF-syslog protocol syslog-ng(): Forward logs to another syslog-ng node tcp, tcp6, udp, udp6: Sending messages to a remote log server using the legacy BSD-syslog protocol (tcp(), udp() drivers) Telegram: Sending messages to Telegram unix-stream, unix-dgram: Sending messages to UNIX domain sockets usertty: Sending messages to a user terminal: usertty() destination Write your own custom destination in Java or Python Client-side failover
log: Filter and route log messages using log paths, flags, and filters Global options of syslog-ng OSE TLS-encrypted message transfer template and rewrite: Format, modify, and manipulate log messages parser: Parse and segment structured messages
Parsing syslog messages Parsing messages with comma-separated and similar values Parsing key=value pairs JSON parser XML parser Parsing dates and timestamps Python parser Parsing tags Apache access log parser Linux audit parser Cisco parser Parsing enterprise-wide message model (EWMM) messages iptables parser Netskope parser panos-parser(): parsing PAN-OS log messages Sudo parser MariaDB parser Websense parser Fortigate parser Check Point Log Exporter parser Regular expression (regexp) parser db-parser: Process message content with a pattern database (patterndb)
Correlating log messages Enriching log messages with external data Statistics of syslog-ng Multithreading and scaling in syslog-ng OSE Troubleshooting syslog-ng Best practices and examples The syslog-ng manual pages Creative Commons Attribution Non-commercial No Derivatives (by-nc-nd) License The syslog-ng Open Source Edition Documentation License Glossary

syslog-ng.conf.5

Name

syslog-ng.conf — syslog-ng configuration file

Synopsis

syslog-ng.conf

Description

This manual page is only an abstract, for the complete documentation of syslog-ng OSE, see the syslog-ng OSE Documentation page.

The syslog-ng OSE application is a flexible and highly scalable system logging application. Typically, syslog-ng OSE is used to manage log messages and implement centralized logging, where the aim is to collect the log messages of several devices on a single, central log server. The different devices - called syslog-ng clients - all run syslog-ng OSE, and collect the log messages from the various applications, files, and other sources. The clients send all important log messages to the remote syslog-ng PE server, where the server sorts and stores them.

Basic concepts of syslog-ng OSE

The syslog-ng OSE application reads incoming messages and forwards them to the selected destinations. The syslog-ng application can receive messages from files, remote hosts, and other sources.

Log messages enter syslog-ng OSE in one of the defined sources, and are sent to one or more destinations.

Sources and destinations are independent objects, log paths define what syslog-ng OSE does with a message, connecting the sources to the destinations. A log path consists of one or more sources and one or more destinations: messages arriving from a source are sent to every destination listed in the log path. A log path defined in syslog-ng OSE is called a log statement.

Optionally, log paths can include filters. Filters are rules that select only certain messages, for example, selecting only messages sent by a specific application. If a log path includes filters, syslog-ng OSE sends only the messages satisfying the filter rules to the destinations set in the log path.

Other optional elements that can appear in log statements are parsers and rewriting rules. Parsers segment messages into different fields to help processing the messages, while rewrite rules modify the messages by adding, replacing, or removing parts of the messages.

Configuring syslog-ng OSE
  • The main body of the configuration file consists of object definitions: sources, destinations, logpaths define which log message are received and where they are sent. All identifiers, option names and attributes, and any other strings used in the syslog-ng configuration file are case sensitive. Object definitions (also called statements) have the following syntax:

    type-of-the-object identifier-of-the-object {<parameters>};
    • Type of the object: One of source, destination, log, filter, parser, rewrite rule, or template.

      Identifier of the object: A unique name identifying the object. When using a reserved word as an identifier, enclose the identifier in quotation marks ("").

      All identifiers, attributes, and any other strings used in the syslog-ng OSE configuration file are case sensitive.

      TIP: Use identifiers that refer to the type of the object they identify. For example, prefix source objects with s_, destinations with d_, and so on.

      NOTE:

      Repeating a definition of an object (that is, defining the same object with the same id more than once) is not allowed, unless you use the @define allow-config-dups 1 definition in the configuration file.

    • Parameters: The parameters of the object, enclosed in braces {parameters}.

    • Semicolon: Object definitions end with a semicolon (;).

    For example, the following line defines a source and calls it s_internal.

    source s_internal { internal(); };

    The object can be later referenced in other statements using its ID, for example, the previous source is used as a parameter of the following log statement:

    log { source(s_internal); destination(d_file); };
  • The parameters and options within a statement are similar to function calls of the C programming language: the name of the option followed by a list of its parameters enclosed within brackets and terminated with a semicolon.

    option(parameter1, parameter2); option2(parameter1, parameter2);

    For example, the file() driver in the following source statement has three options: the filename (/var/log/apache/access.log), follow-freq(), and flags(). The follow-freq() option also has a parameter, while the flags() option has two parameters.

    source s_tail { file("/var/log/apache/access.log"
    follow-freq(1) flags(no-parse, validate-utf8)); };

    Objects may have required and optional parameters. Required parameters are positional, meaning that they must be specified in a defined order. Optional parameters can be specified in any order using the option(value) format. If a parameter (optional or required) is not specified, its default value is used. The parameters and their default values are listed in the reference section of the particular object.

    Example: Using required and optional parameters

    The unix-stream() source driver has a single required argument: the name of the socket to listen on. Optional parameters follow the socket name in any order, so the following source definitions have the same effect:

    source s_demo_stream1 {
    					unix-stream("<path-to-socket>" max-connections(10) group(log)); };
    					source s_demo_stream2 {
    unix-stream("<path-to-socket>" group(log) max-connections(10)); };
  • Some options are global options, or can be set globally, for example, whether syslog-ng OSE should use DNS resolution to resolve IP addresses.

    options { use-dns(no); };
  • Objects can be used before definition.

  • Objects can be defined inline as well. This is useful if you use the object only once (for example, a filter).

  • To add comments to the configuration file, start a line with # and write your comments. These lines are ignored by syslog-ng OSE.

    	#Comment: This is a stream source
    source s_demo_stream {
    unix-stream("<path-to-socket>" max-connections(10) group(log)); };

The syntax of log statements is as follows:

log {
	source(s1); source(s2); ...
optional_element(filter1|parser1|rewrite1);
optional_element(filter2|parser2|rewrite2);
			...
destination(d1); destination(d2); ...
flags(flag1[, flag2...]);
		};

The following log statement sends all messages arriving to the localhost to a remote server.

		source s_localhost { network(ip(127.0.0.1) port(1999)); };
		destination d_tcp { network("10.1.2.3" port(1999) localport(999)); };
		log { source(s_localhost); destination(d_tcp); };

The syslog-ng OSE application has a number of global options governing DNS usage, the timestamp format used, and other general points. Each option may have parameters, similarly to driver specifications. To set global options add an option statement to the syslog-ng OSE configuration file using the following syntax:

	options { option1(params); option2(params); ... };
Example: Using global options

To disable domain name resolving, add the following line to the syslog-ng OSE configuration file:

options { use-dns(no); };

The sources, destinations, and filters available in syslog-ng OSE are listed below. For details, see the syslog-ng OSE Documentation page.

Table: Source drivers available in syslog-ng OSE
Name Description
file() Opens the specified file and reads messages.
wildcard-file() Reads messages from multiple files and directories.
internal() Messages generated internally in syslog-ng OSE.
network() Receives messages from remote hosts using the BSD-syslog protocol over IPv4 and IPv6. Supports the TCP, UDP, and TLS network protocols.
nodejs() Receives JSON messages from nodejs applications.
mbox() Read e-mail messages from local mbox files, and convert them to multiline log messages.
osquery() Run osquery queries, and convert their results into log messages.
pacct() Reads messages from the process accounting logs on Linux.
pipe() Opens the specified named pipe and reads messages.
program() Opens the specified application and reads messages from its standard output.
snmptrap() Read and parse the SNMP traps of the Net-SNMP's snmptrapd application.
sun-stream(), sun-streams() Opens the specified STREAMS device on Solaris systems and reads incoming messages.
syslog() Listens for incoming messages using the new IETF-standard syslog protocol.
system() Automatically detects which platform syslog-ng OSE is running on, and collects the native log messages of that platform.
systemd-journal() Collects messages directly from the journal of platforms that use systemd.
systemd-syslog() Collects messages from the journal using a socket on platforms that use systemd.
unix-dgram() Opens the specified unix socket in SOCK_DGRAM mode and listens for incoming messages.
unix-stream() Opens the specified unix socket in SOCK_STREAM mode and listens for incoming messages.
stdin() Collects messages from the standard input stream.
Table 2. Destination drivers available in syslog-ng
Name Description
amqp() Publishes messages using the AMQP (Advanced Message Queuing Protocol).
elasticsearch2 Sends messages to an Elasticsearch server. The elasticsearch2 driver supports Elasticsearch version 2 and newer.
file() Writes messages to the specified file.
graphite() Sends metrics to a Graphite server to store numeric time-series data.
graylog2() Sends syslog messages to Graylog.
hdfs() Sends messages into a file on a Hadoop Distributed File System (HDFS) node.
http() Sends messages over the HTTP protocol. There are two different implementations of this driver: a Java-based http driver, and an http driver without Java.
kafka() Publishes log messages to the Apache Kafka message bus, where subscribers can access them.
loggly() Sends log messages to the Loggly Logging-as-a-Service provider.
logmatic() Sends log messages to the Logmatic.io Logging-as-a-Service provider.
mongodb() Sends messages to a MongoDB database.
network() Sends messages to a remote host using the BSD-syslog protocol over IPv4 and IPv6. Supports the TCP, UDP, and TLS network protocols.
pipe() Writes messages to the specified named pipe.
program() Forks and launches the specified program, and sends messages to its standard input.
redis() Sends messages as name-value pairs to a Redis key-value store.
riemann() Sends metrics or events to a Riemann monitoring system.
smtp() Sends e-mail messages to the specified recipients.
sql() Sends messages into an SQL database. In addition to the standard syslog-ng OSE packages, the sql() destination requires database-specific packages to be installed.
stomp() Sends messages to a STOMP server.
syslog() Sends messages to the specified remote host using the IETF-syslog protocol. The IETF standard supports message transport using the UDP, TCP, and TLS networking protocols.
unix-dgram() Sends messages to the specified unix socket in SOCK_DGRAM style (BSD).
unix-stream() Sends messages to the specified unix socket in SOCK_STREAM style (Linux).
usertty() Sends messages to the terminal of the specified user, if the user is logged in.
Table 3. Filter functions available in syslog-ng OSE
Name Description
facility() Filter messages based on the sending facility.
filter() Call another filter function.
host() Filter messages based on the sending host.
inlist() File-based whitelisting and blacklisting.
level() or priority() Filter messages based on their priority.
match() Use a regular expression to filter messages based on a specified header or content field.
message() Use a regular expression to filter messages based on their content.
netmask() Filter messages based on the IP address of the sending host.
program() Filter messages based on the sending application.
source() Select messages of the specified syslog-ng OSE source statement.
tags() Select messages having the specified tag.
Files

/opt/syslog-ng/

/opt/syslog-ng/etc/syslog-ng.conf

See also

The syslog-ng manual page

NOTE: For the detailed documentation of syslog-ng OSE see syslog-ng OSE Documentation page.

If you experience any problems or need help with syslog-ng OSE, visit the syslog-ng mailing list.

For news and notifications about syslog-ng OSE, visit the syslog-ng blogs.

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