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syslog-ng Premium Edition 7.0.30 - 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 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

Declaration

You can use the following example as a configuration block template for declaring the google-pubsub() source in your configuration:

google-pubsub(project("project") 
  subscription("sub") 
  credentials("creds.json")
);

The Google Pub/Sub message format in syslog-ng PE

From version 7.0.22, syslog-ng Premium Edition (syslog-ng PE) can collect messages from Google Pub/Sub.

NOTE: The rest of this section assumes that you are familiar with the Google Pub/Sub messaging service, and its concepts and terminology.

Messages on the Google Cloud Platform side

The syslog-ng PE application's google-pubsub() source collects Google Pub/Sub messages in a format that has two message parts (Message body and Message attributes) on the Google Cloud Platform side.

NOTE: Google Pub/Sub messages must contain at least one of the Message body and Message attributes message parts.

For more information about Google Pub/Sub message format on the Google Cloud Platform side, see Message format.

For more information about publishing Google Pub/Sub messages on the Google Cloud Platform side, see Publishing messages.

Processing the Message body contents on the syslog-ng PE side

After collecting the contents of the Google Pub/Sub message's Message body field as raw, unformatted data, the google-pubsub() source stores the message contents in the $MESSAGE syslog-ng PE macro. Next, syslog-ng PE prepends a header to the message contents, and the resulting data will form the syslog-ng PE output.

Example: incoming Google Pub/Sub Cloud message contents, resulting $MESSAGE macro contents, and processed output message contents with a prepended Message header

Incoming message contents on the Google Pub/Sub Cloud side: 

<38>Feb 25 14:09:07 testhost testapp: test message - 1

The contents of the relevant $MESSAGE macro:

* name='MESSAGE', value='<38>Feb 25 14:09:07 testhost testapp: test message - 1'

By default, the syslog-ng PE application prepends a Message header to the $MESSAGE macro contents to form an output with a similar structure:

<13>Sep 29 14:59:28 ubuntu-xenail-amd64 <38>Feb 25 14:09:07 testhost testapp: test message - 1
Topics:

The contents of the Google Pub/Sub Message body on the syslog-ng Premium Edition (syslog-ng PE) side

The syslog-ng PE application's google-pubsub() source collects Google Pub/Sub messages in a format that has two message parts (Message body and Message attributes) on the Google Cloud Platform side.

NOTE: Google Pub/Sub messages must contain at least one of the Message body and Message attributes message parts.

After collecting the contents of the Google Pub/Sub message's Message body field as raw, unformatted data, the google-pubsub() source stores the message contents in the $MESSAGE syslog-ng PE macro. Next, syslog-ng PE prepends a header to the message contents, and the resulting data will form the syslog-ng PE output.

If the Google Pub/Sub message also contains data from Message attributes, these attributes are displayed in the output as attribute names following the prepended prefix.

Example: Message body contents in the $MESSAGE syslog-ng PE macro

The following example shows illustrates what Message body contents on the Google Pub/Sub Cloud side will look like in the $MESSAGE syslog-ng PE macro:

With the incoming Message body contents on the Google Pub/Sub Cloud side:

<38>Feb 25 14:09:07 testhost testapp: test message - 1

The contents of the relevant $MESSAGE macro will look similar to this:

* name='MESSAGE', value='<38>Feb 25 14:09:07 testhost testapp: test message - 1'

The contents of the Google Pub/Sub Message attributes on the syslog-ng PE (syslog-ng PE) side

The syslog-ng PE application's google-pubsub() source collects Google Pub/Sub messages in a format that has two message parts (Message body and Message attributes) on the Google Cloud Platform side.

NOTE: Google Pub/Sub messages must contain at least one of the Message body and Message attributes message parts.

The contents of the message attributes can be customized with the prefix() option, where the prefix is .pubsub. by default.

The contents of the message attributes message part are key-value pairs, for example, ${.pubsub.attribute_name}.

Example: incoming Google Pub/Sub Cloud message contents (including message attributes), the resulting $MESSAGE macro contents and key-values, and processed output message contents with a prepended Message header

Incoming message contents on the Google Pub/Sub Cloud side:

<38>Feb 25 14:09:07 testhost testapp: test message - 1

Incoming attribute values to the message on the Google Pub/Sub Cloud side:

* attrib_name1="attrib_value1"
* attrib_name2="attrib_value2"

The contents and key-values of the relevant $MESSAGE macros:

* name='MESSAGE', value='<38>Feb 25 14:09:07 testhost testapp: test message - 1'
* attrib_name1="attrib_value1"
* attrib_name2="attrib_value2"

By default, the syslog-ng PE application prepends a Message header to the $MESSAGE macro contents to form an output with a similar structure:

<13>Sep 29 14:59:28 ubuntu-xenail-amd64 <38>Feb 25 14:09:07 testhost testapp: test message - 1
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