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syslog-ng Open Source Edition 3.16 - 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 network: Collecting messages using the RFC3164 protocol (network() driver) nodejs: Receiving JSON messages from nodejs applications mbox: Converting local e-mail 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 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 elasticsearch: Sending messages directly to Elasticsearch version 1.x elasticsearch2: Sending logs directly to Elasticsearch and Kibana 2.0 or higher 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 loggly: Using Loggly logmatic: Using Logmatic.io mongodb: Storing messages in a MongoDB database 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() redis: Storing name-value pairs in Redis riemann: Monitoring your data with Riemann smtp: Generating SMTP messages (e-mail) from logs Splunk: Sending log messages to Splunk sql: Storing messages in an SQL database stomp: Publishing messages using STOMP syslog: Sending messages to a remote logserver using the IETF-syslog protocol syslog-ng: Forwarding messages and tags 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
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 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 Third-party contributions Creative Commons Attribution Non-commercial No Derivatives (by-nc-nd) License About us

Compiling options of syslog-ng OSE

When compiling syslog-ng OSE from source, you can use the following compiling options.

  • --enable-all-modules This option will turn on or off all modules and most features when enabled, unless a feature is explicitly disabled, or not detected automatically. Currently, this means that you must explicitly enable the pacct() source, since it is not detected automatically (all other modules are compiled automatically if the required libraries are available).

    This also means that the Sun Streams source is enabled on every platform, not only on Solaris, causing a compile error. Use --enable-all-modules together with --disable-sun-streams.

  • --disable-http Disable support for the http() destination that is based on libcurl.

  • --disable-python Disable support for Python-based modules.

  • --disable-json Disable JSON support. It also disables json-parser, and the format-cim and format-json template functions. Also, it disables JSON support even if the json-c library is installed and detected (see --enable-json).

  • --disable-smtp Disable SMTP support. By default, SMTP support is enabled if the libesmtp library is detected.

  • --enable-amqp Enable the amqp destination (enabled by default). The source of the RabbitMQ client is included in the source code package of syslog-ng OSE. To use an external client instead, use the --with-librabbitmq-client=system compiling option. For details on using this destination, see amqp: Publishing messages using AMQP.

  • --enable-debug Include debug information.

  • --enable-dynamic-linking Compile syslog-ng as a completely dynamic binary. If not specified syslog-ng uses mixed linking (--enable-mixed-linking): it links dynamically to system libraries and statically to everything else.

  • --enable-geoip Enable GEOIP support, required for the geoip2 template function and the geoip2-parser (enabled automatically if the libmaxminddb library is detected).

  • --enable-ipv6 Enable IPv6 support.

  • --enable-java Enable support for Java-based modules. For other requirements, see the description of the Java-based module (for example, Prerequisites) that you want to use.

  • --enable-java-modules Compile the Gradle projects of every Java module available in modules/java-modules.

  • --enable-json Enables JSON support (by default, it uses the json-c library included in the source code package of syslog-ng OSE). JSON support is required for json-parser, and the format-cim and format-json template functions.

  • --enable-linux-caps Enable support for capabilities on Linux. For details, see The syslog-ng manual page.

  • --enable-mongodb Enable the mongodb destination (enabled by default). The source of the MongoDB client is included in the source code package of syslog-ng OSE. To use an external MongoDB client instead, use the --with-libmongo-client=system compiling option. For details on using this destination, see mongodb: Storing messages in a MongoDB database.

  • --enable-pacct Enable using the pacct() driver to collect process-accounting logs on Linux systems.

  • --enable-python Enable support for Python-based modules.

  • --enable-redis Enable the redis destination (enabled by default). The source of the libhiredis client (0.11 or newer) must be available. To specify the location of the library, use the --with-libhiredis=<path-to-libhiredis> compiling option. For details on using this destination, see redis: Storing name-value pairs in Redis.

  • --enable-riemann Enable the riemann destination (enabled by default). The source of the libriemann client must be available. For details on using this destination, see riemann: Monitoring your data with Riemann.

  • --enable-spoof-source Enable spoof_source feature (disabled by default).

  • --enable-sql Enables the sql() destination (enabled automatically if the libdbi library version 0.9 or newer is installed and detected).

  • --enable-ssl Enable SSL support, required for encrypted message transfer, as well as template functions that calculate hashes and UUIDs (enabled automatically if the libopenssl library is detected).

  • --enable-sun-door Enable Sun door support even if not detected (autodetected by default).

  • --enable-sun-streams Enable Sun STREAMS support even if not detected (autodetected by default).

  • --enable-systemd Enable systemd support on Linux platforms (autodetected by default) (enabled automatically if the libsystemd-daemon library is detected).

  • --enable-tcp-wrapper Enable using /etc/hosts.deny and /etc/hosts.allow for TCP access (enabled automatically if the libwrap libraries are detected).

  • --with-embedded-crypto If this option is set, the crypto library is linked directly into libsyslog-ng: the sources of libsyslog-ng-crypto will be appended to the libsyslog-ng sources, and -crypto is not built.

  • --with-ivykis Specifies which ivykis implementation to use (default value: internal). The source of ivykis is included in the source code package of syslog-ng OSE and is used by default. To use an external implementation instead, use the --with-ivykis=system compiling option.

  • --with-libcurl Specifies the path to the libcurl library. For details on using this destination, see http: Posting messages over HTTP without Java.

  • --with-libhiredis Specifies the path to the libhiredis library (0.11 or newer). For details on using this destination, see redis: Storing name-value pairs in Redis.

  • --with-libmongo-client Specifies which MongoDB client to use (default value: internal). The source of the mongodb client is included in the source code package of syslog-ng OSE. To use an external MongoDB client instead, use the --with-libmongo-client=system compiling option. For details on using this destination, see mongodb: Storing messages in a MongoDB database.

  • --with-librabbitmq-client Specifies which RabbitMQ client to use (default value: internal). The source of the rabbitmq client is included in the source code package of syslog-ng OSE and is used by default. To use an external client instead, use the --with-librabbitmq-client=system compiling option. For details on using this destination, see amqp: Publishing messages using AMQP.

  • --with-module-dir Specifies a single directory where the syslog-ng OSE Makefile will install the modules.

  • --module-install-dir Specifies syslog-ng OSE's module installation directory (normally $prefix/lib/syslog-ng). All Java-based SCLs use this option.

  • --with-module-path Specifies a colon-separated (:) list of directories, where the syslog-ng OSE binary will search for modules.

  • --with-python Specifies which Python version to use, for example, --with-python=2.7

  • --with-timezone-dir Specifies the directory where syslog-ng looks for the timezone files to resolve the time-zone() and local-time-zone() options. If not specified, the /opt/syslog-ng/share/zoneinfo/ and /usr/share/zoneinfo/ directories are checked, respectively. Note that HP-UX uses a unique file format (tztab) to describe the timezone information, but that format is currently not supported in syslog-ng. As a workaround, copy the zoneinfo files from another, non-HP-UX system to the /opt/syslog-ng/share/zoneinfo/ directory of your HP-UX system.

  • --without-compile-date Removes the compilation date from the binary. For example, as openSUSE checks if recompilation changes the binary to detect if dependent packages need to be rebuilt or not, and including the date changes the binary every time.


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Uninstalling syslog-ng OSE

If you need to uninstall syslog-ng OSE for some reason, you have the following options:

  • If you have installed syslog-ng OSE from a .deb package: Execute the dpkg -r syslog-ng command to remove syslog-ng, or the dpkg -P syslog-ng command to remove syslog-ng OSE and the configuration files as well. Note that removing syslog-ng OSE does not restore the syslog daemon used before syslog-ng.

  • If you have installed syslog-ng OSE from an .rpm package: Execute the rpm -e syslog-ng command to remove syslog-ng OSE. Note that removing syslog-ng OSE does not restore the syslog daemon used before syslog-ng OSE.

  • If you have compiled syslog-ng OSE from source: Execute the sudo make uninstall command to remove syslog-ng OSE. Note that removing syslog-ng OSE does not restore the syslog daemon used before syslog-ng OSE.


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Configuring Microsoft SQL Server to accept logs from syslog-ng

Purpose:

Complete the following steps to configure your Microsoft SQL Server to enable remote logins and accept log messages from syslog-ng.

Steps:
  1. Start the SQL Server Management Studio application. Select Start > Programs > Microsoft SQL Server 2005 > SQL Server Management Studio.

  2. Create a new database.

    1. Figure 5: Creating a new MSSQL database 1.

      In the Object Explorer, right-click on the Databases entry and select New Database.

    2. Figure 6: Creating a new MSSQL database 2.

      Enter the name of the new database (for example syslogng) into the Database name field and click OK.

  3. Create a new database user and associate it with the new database.

    1. Figure 7: Creating a new MSSQL user 1.

      In the Object Explorer, select Security, right-click on the Logins entry, then select New Login.

    2. Figure 8: Creating a new MSSQL user 2.

      Enter a name (for example syslog-ng) for the user into the Login name field.

    3. Select the SQL Server Authentication option and enter a password for the user.

    4. In the Default database field, select the database created in Step 2 (for example syslogng).

    5. In the Default language field, select the language of log messages that you want to store in the database, then click OK.

      Caution:

      Incorrect language settings may result in the database converting the messages to a different character-encoding format. That way the log messages may become unreadable, causing information loss.

    6. In the Object Explorer, select Security > Logins, then right-click on the new login created in the previous step, and select Properties.

    7. Figure 9: Associating database with the new user

      Select User Mapping. In the Users mapped to this login option, check the line corresponding to the new login (for example syslogng). In the Database role membership field, check the db_owner and public options.

  4. Figure 10: Associating database with the new user

    Enable remote logins for SQL users.

    In the Object Explorer right-click on your database server, and select Properties > Security, and set the Server Authentication option to SQL Server and Windows Authentication mode.


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The syslog-ng OSE quick-start guide

This chapter provides a very brief introduction into configuring the syslog-ng OSE application. For details on the format of the configuration file and how to configure sources, destinations, and other features, refer to the subsequent chapters.


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