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syslog-ng Premium Edition 7.0.32 - Administration Guide

Preface Introduction to syslog-ng The concepts of syslog-ng Installing syslog-ng PE The syslog-ng PE quick-start guide The syslog-ng PE configuration file Collecting log messages — sources and source drivers
How sources work default-network-drivers: Receive and parse common syslog messages internal: Collecting internal messages file: Collecting messages from text files google-pubsub: collecting messages from the Google Pub/Sub messaging service wildcard-file: Collecting messages from multiple text files linux-audit: Collecting messages from Linux audit logs mssql, oracle, sql: collecting messages from an SQL database network: Collecting messages using the RFC3164 protocol (network() driver) office365: Fetching logs from Office 365 osquery: Collect and parse osquery result logs pipe: Collecting messages from named pipes program: Receiving messages from external applications python: writing server-style Python sources python-fetcher: writing fetcher-style Python sources snmptrap: Read Net-SNMP traps 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 udp-balancer: Receiving UDP messages at very high rate unix-stream, unix-dgram: Collecting messages from UNIX domain sockets windowsevent: Collecting Windows event logs
Sending and storing log messages — destinations and destination drivers
elasticsearch2>: Sending messages directly to Elasticsearch version 2.0 or higher (DEPRECATED) elasticsearch-http: Sending messages to Elasticsearch HTTP Event Collector file: Storing messages in plain-text files google_pubsub(): Sending logs to the Google Cloud Pub/Sub messaging service google_pubsub-managedaccount(): Sending logs to the Google Cloud Pub/Sub messaging service authenticated by Google Cloud managed service account hdfs: Storing messages on the Hadoop Distributed File System (HDFS) http: Posting messages over HTTP kafka(): Publishing messages to Apache Kafka (Java implementation) (DEPRECATED) kafka-c(): Publishing messages to Apache Kafka using the librdkafka client (C implementation) logstore: Storing messages in encrypted files mongodb: Storing messages in a MongoDB database network: Sending messages to a remote log server using the RFC3164 protocol (network() driver) pipe: Sending messages to named pipes program: Sending messages to external applications python: writing custom Python destinations sentinel(): Sending logs to the Microsoft Azure Sentinel cloud snmp: Sending SNMP traps smtp: Generating SMTP messages (email) from logs splunk-hec: Sending messages to Splunk HTTP Event Collector sql(): Storing messages in an SQL database stackdriver: Sending logs to the Google Stackdriver cloud 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) unix-stream, unix-dgram: Sending messages to UNIX domain sockets usertty: Sending messages to a user terminal — usertty() destination Client-side failover
Routing messages: log paths, flags, and filters Global options of syslog-ng PE TLS-encrypted message transfer Advanced Log Transport Protocol Reliability and minimizing the loss of log messages Manipulating messages parser: Parse and segment structured messages Processing message content with a pattern database Correlating log messages Enriching log messages with external data Monitoring statistics and metrics of syslog-ng Multithreading and scaling in syslog-ng PE Troubleshooting syslog-ng Best practices and examples The syslog-ng manual pages Glossary

Configuring log rotation

The syslog-ng PE application does not rotate logs by itself. To use syslog-ng PE for log rotation, consider the following approaches:

Use logrotate together with syslog-ng PE
  • It is ideal for workstations or when processing fewer logs.

  • It is included in most distributions by default.

  • Less scripting is required, only logrotate has to be configured correctly.

  • Requires frequent restart (syslog-ng PE must be reloaded/restarted when the files are rotated). After rotating the log files, reload syslog-ng PE using the syslog-ng-ctl reload command, or use another method to send a SIGHUP to syslog-ng PE.

  • The statistics collected by syslog-ng PE, and the correlation information gathered with Pattern Database, are lost with each restart.

Separate incoming logs based on time, host or other information
  • It is ideal for central log servers, where regular restart of syslog-ng PE is unfavorable.

  • Requires shell scripts or cron jobs to remove old logs.

  • It can be done by using macros in the destination name (in the filename, directory name, or the database table name).

Example: File destination for log rotation

This sample file destination configuration stores incoming logs in files that are named based on the current year, month and day, and places these files in directories that are named based on the hostname:

destination d_sorted { file("/var/log/remote/${HOST}/${YEAR}_${MONTH}_${DAY}.log" create-dirs(yes)); };
Example: Logstore destination for log rotation

This sample logstore destination configuration stores incoming logs in logstores that are named based on the current year, month and day, and places these logstores in directories that are named based on the hostname:

destination d_logstore { logstore("/var/log/remote/${HOST}/${YEAR}_${MONTH}_${DAY}.lgs" create-dirs(yes)); };
Example: Command for cron for log rotation

This sample command for cron removes files older than two weeks from the /var/log/remote directory:

find /var/log/remote/ -daystart -mtime +14 -type f -exec rm {} \;

Load balancing logs between multiple destinations

These sections describe a method of load balancing logs between multiple syslog-ng Premium Edition (syslog-ng PE) destinations. The first subsection describes the round robin load balancing method based on the R_MSEC macro of syslog-ng PE, while the second subsection describes a configuration generator that you can use as an alternative to using the example configuration described in the first subsection.

For more information about the R_MSEC macro and further macros of syslog-ng PE, see Macros of syslog-ng PE.

Topics:

Load balancing with a round robin load balancing method based on the R_MSEC macro of syslog-ng PE

This section describes a round robin load balancing method based on the R_MSEC macro of syslog-ng Premium Edition (syslog-ng PE) to load balance your logs between multiple syslog-ng PE destinations.

TIP: If R_MSEC is not precise enough, you can replace it with R_USEC (which uses microseconds instead of milliseconds).

For more information about the R_MSEC macro and further macros of syslog-ng PE, see Macros of syslog-ng PE.

Example: round robin load balancing between multiple destinations

The following example is a round-robin load balancing method, based on syslog-ng PE's R_MSEC macro.

destination d_lb_network { 
  channel { 
    channel { 
      filter { 
      "0" == "$(% ${R_MSEC} 2)" 
      }; 
      destination { 
        network("myhost1" 
          disk-buffer(mem-buf-length(10000) disk-buf-size(2000000))); 
      }; 
      flags(final); 
    }; 
 
    channel { 
    filter { 
    "1" == "$(% ${R_MSEC} 2)" 
    }; 

    destination { 
      network("myhost2" 
        disk-buffer(mem-buf-length(10000) disk-buf-size(2000000))); 
    }; 
    flags(final); 
    }; 
  }; 
}; 

The filter {" <return value >" == "$(% ${R_MSEC} 2)"}; code snippets (in bold) serve as the basis of the method. This filter separates incoming log messages' timestamp values based on the R_MSEC macro, using a division with remainder method, and distributes the log messages equally between two destinations based on the return value (in this case, 0 or 1).

If you need a file instead of a network destination, replace the network destination with the file in the example (and use the same analogy for any other syslog-ng PE destinations).

For an alternative method to use the round robin load balancing method based on the R_MSEC macro, see Configuration generator for the load balancing method based on MSEC hashing.

Configuration generator for the load balancing method based on MSEC hashing

This section describes a configuration generator for the load balancing method based on MSEC hashing to load balance your logs between multiple syslog-ng Premium Edition (syslog-ng PE) destinations.

Caution:

Consider that network-load-balancer() is not a destination, only a script that generates the example configuration described in Load balancing with a round robin load balancing method based on the R_MSEC macro of syslog-ng PE .

Also consider that the configuration generator script may change incompatibly in the future. As a result, One Identity does not officially support using this script, and recommends that you only use this script at your own risk.

As an alternative to using the example configuration described in Load balancing with a round robin load balancing method based on the R_MSEC macro of syslog-ng PE , a configuration generator script is also available in syslog-ng PE:

destination d_lb {network-load-balancer(targets(myhost1 myhost2 myhost3))};

Where destinations share the same configuration except for the destination address, balancing is based on MSEC hashing.

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