syslog-ng Open Source Edition 3.37 - 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 Glossary

How to get information about disk-buffer files

This section describes how to get information about disk-buffer files used in syslog-ng Open Source Edition (syslog-ng OSE).

NOTE: While reading this section, consider that the default installation path used in the commands and syslog-ng OSE files is /opt/syslog-ng.

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Information about disk-buffer files

This section describes information about disk-buffer files used in syslog-ng Open Source Edition (syslog-ng OSE).

The following list contains information about how disk-buffer files are used in syslog-ng OSE:

  • You can configure disk-buffer() for a remote destination in the destination() statement.

    For more information about an example of configuring disk-buffer() for a remote destination in the destination() statement, see disk-buffer().

  • By default, syslog-ng OSE creates disk-buffer files under /opt/syslog-ng/var directory, unless dir() option is set in disk-buffer().
  • The filenames are generated automatically by syslog-ng OSE with the extensions .qf for a normal disk-buffer and .rqf for a reliable disk-buffer.
  • The disk-buffer file stores processed log messages in the format in which they would have been sent out to the destination, but doesn't store information about the destination.

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Getting the status information of disk-buffer files

This section describes getting the status information of the disk-buffer files used in syslog-ng Open Source Edition (syslog-ng OSE).

Command syntax

The basic command syntax for getting the status information of the disk-buffer files used in syslog-ng OSE looks like the following:

dqtoolinfo DISK-BUFFER_FILE
Example commands

The following example commands describe how you can get the status information of two different types of disk-buffer files (namely, empty normal disk-buffer files, and non-empty reliable disk-buffer queue files).

Example commands for empty, normal disk-buffer files, and non-empty, reliable disk-buffer queue files
  • Empty, normal disk-buffer file

    dqtool info /var/lib/syslog-ng/syslog-ng-00000.qf

    Disk-buffer state loaded; filename='/var/lib/syslog-ng/syslog-ng-00000.qf', number_of_messages='0'

  • Non-empty, reliable disk-buffer queue file

    dqtool info /opt/syslog-ng/var/syslog-ng-00000.rqf

    Reliable disk-buffer state loaded; filename='/opt/syslog-ng/var/syslog-ng-00000.rqf', number_of_messages='10'

One-liner command to get the state of disk-buffer files in the default directory

You can use the following one-liner command to get the state of disk-buffer files in the default directory:

for qfile in /opt/syslog-ng/var/*.?(r)qf ; do dqtool info $qfile 2>&1 ; done

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Getting the list of disk-buffer files

This section describes getting the list of disk-buffer files used in syslog-ng Open Source Edition(syslog-ng OSE).

The syslog-ng OSE application stores information (namely, the IP:PORT or DNS:PORT of the destinations, and the name of the disk-buffer file) about disk-buffer files in its persist file.

Example: command for listing the disk-buffer files in use

The following command will list the disk-buffer files in use:

/opt/syslog-ng/bin/persist-tool dump /var/lib/syslog-ng/syslog-ng.persist | awk -F '["=]' '/(qfile\(|\.queue)/ { gsub(/[ \t]+/, "", $5); gsub(/^[0-9A-Fa-f]{8}/, "", $5); "echo "$5"|xxd -r -p"|& getline QUEUE; printf("%s ==> %s\n",$1,QUEUE)}'

The example output will look like the following:

afsocket_dd_qfile(stream,10.21.10.20:601)  ==> /opt/syslog-ng/var/syslog-ng-00000.rqf

NOTE: If you receive the following error message instead of the example output, install a vim-common package on your system:

xxd: command not found

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