Logback GELF

Logback appender for sending GELF (Graylog Extended Log Format) messages with zero additional dependencies.

Latest release

The most recent release is 2.1.0, released June 12, 2019.

To add a dependency using Maven, use the following:

<dependency>
    <groupId>de.siegmar</groupId>
    <artifactId>logback-gelf</artifactId>
    <version>2.1.0</version>
</dependency>

To add a dependency using Gradle:

dependencies {
    compile 'de.siegmar:logback-gelf:2.1.0'
}

Features

UDP (with chunking)
TCP (with or without TLS encryption)
Deflate compression in UDP mode
Client side load balancing (round robin)
Forwarding of MDC (Mapped Diagnostic Context)
Forwarding of caller data
Forwarding of static fields
Forwarding of exception root cause
No runtime dependencies beside Logback

Requirements

Java 7
Logback 1.2.3

Important notes

Version 2.0.0 of this library introduced a configuration change. If you were already using this library, update your configuration to keep it working!

Old format:

<layout class="de.siegmar.logbackgelf.GelfLayout">

New format:

<encoder class="de.siegmar.logbackgelf.GelfEncoder">

This change was introduced, as the API of the Encoder interface changed in Logback 1.2.0.

Example

Simple UDP configuration:

<configuration>

    <appender name="GELF" class="de.siegmar.logbackgelf.GelfUdpAppender">
        <graylogHost>localhost</graylogHost>
        <graylogPort>12201</graylogPort>
    </appender>

    <root level="debug">
        <appender-ref ref="GELF" />
    </root>

</configuration>

Simple TCP configuration:

<configuration>

    <appender name="GELF" class="de.siegmar.logbackgelf.GelfTcpAppender">
        <graylogHost>localhost</graylogHost>
        <graylogPort>12201</graylogPort>
    </appender>

    <root level="debug">
        <appender-ref ref="GELF" />
    </root>

</configuration>

Simple TCP with TLS configuration:

<configuration>

    <appender name="GELF" class="de.siegmar.logbackgelf.GelfTcpTlsAppender">
        <graylogHost>localhost</graylogHost>
        <graylogPort>12201</graylogPort>
    </appender>

    <root level="debug">
        <appender-ref ref="GELF" />
    </root>

</configuration>

Please note, that it is recommended to use Logback's AsyncAppender in conjunction with GelfTcpAppender or GelfTcpTlsAppender to send logs asynchronously. See the advanced configuration example below.

Advanced UDP configuration:

<configuration>

    <appender name="GELF" class="de.siegmar.logbackgelf.GelfUdpAppender">
        <graylogHost>localhost</graylogHost>
        <graylogPort>12201</graylogPort>
        <maxChunkSize>508</maxChunkSize>
        <useCompression>true</useCompression>
        <encoder class="de.siegmar.logbackgelf.GelfEncoder">
            <originHost>localhost</originHost>
            <includeRawMessage>false</includeRawMessage>
            <includeMarker>true</includeMarker>
            <includeMdcData>true</includeMdcData>
            <includeCallerData>false</includeCallerData>
            <includeRootCauseData>false</includeRootCauseData>
            <includeLevelName>false</includeLevelName>
            <shortPatternLayout class="ch.qos.logback.classic.PatternLayout">
                <pattern>%m%nopex</pattern>
            </shortPatternLayout>
            <fullPatternLayout class="ch.qos.logback.classic.PatternLayout">
                <pattern>%m%n</pattern>
            </fullPatternLayout>
            <numbersAsString>false</numbersAsString>
            <staticField>app_name:backend</staticField>
            <staticField>os_arch:${os.arch}</staticField>
            <staticField>os_name:${os.name}</staticField>
            <staticField>os_version:${os.version}</staticField>
        </encoder>
    </appender>

    <root level="debug">
        <appender-ref ref="GELF" />
    </root>

</configuration>

Advanced TCP configuration:

<configuration>

    <appender name="GELF" class="de.siegmar.logbackgelf.GelfTcpAppender">
        <graylogHost>localhost</graylogHost>
        <graylogPort>12201</graylogPort>
        <connectTimeout>15000</connectTimeout>
        <reconnectInterval>300</reconnectInterval>
        <maxRetries>2</maxRetries>
        <retryDelay>3000</retryDelay>
        <poolSize>2</poolSize>
        <poolMaxWaitTime>5000</poolMaxWaitTime>
        <encoder class="de.siegmar.logbackgelf.GelfEncoder">
            <originHost>localhost</originHost>
            <includeRawMessage>false</includeRawMessage>
            <includeMarker>true</includeMarker>
            <includeMdcData>true</includeMdcData>
            <includeCallerData>false</includeCallerData>
            <includeRootCauseData>false</includeRootCauseData>
            <includeLevelName>false</includeLevelName>
            <shortPatternLayout class="ch.qos.logback.classic.PatternLayout">
                <pattern>%m%nopex</pattern>
            </shortPatternLayout>
            <fullPatternLayout class="ch.qos.logback.classic.PatternLayout">
                <pattern>%m%n</pattern>
            </fullPatternLayout>
            <numbersAsString>false</numbersAsString>
            <staticField>app_name:backend</staticField>
            <staticField>os_arch:${os.arch}</staticField>
            <staticField>os_name:${os.name}</staticField>
            <staticField>os_version:${os.version}</staticField>
        </encoder>
    </appender>

    <appender name="ASYNC GELF" class="ch.qos.logback.classic.AsyncAppender">
        <appender-ref ref="GELF" />
    </appender>

    <root level="debug">
        <appender-ref ref="ASYNC GELF" />
    </root>

</configuration>

Advanced TCP with TLS configuration:

<configuration>

    <appender name="GELF" class="de.siegmar.logbackgelf.GelfTcpTlsAppender">
        <graylogHost>localhost</graylogHost>
        <graylogPort>12201</graylogPort>
        <connectTimeout>15000</connectTimeout>
        <reconnectInterval>300</reconnectInterval>
        <maxRetries>2</maxRetries>
        <retryDelay>3000</retryDelay>
        <poolSize>2</poolSize>
        <poolMaxWaitTime>5000</poolMaxWaitTime>
        <trustAllCertificates>false</trustAllCertificates>
        <encoder class="de.siegmar.logbackgelf.GelfEncoder">
            <originHost>localhost</originHost>
            <includeRawMessage>false</includeRawMessage>
            <includeMarker>true</includeMarker>
            <includeMdcData>true</includeMdcData>
            <includeCallerData>false</includeCallerData>
            <includeRootCauseData>false</includeRootCauseData>
            <includeLevelName>false</includeLevelName>
            <shortPatternLayout class="ch.qos.logback.classic.PatternLayout">
                <pattern>%m%nopex</pattern>
            </shortPatternLayout>
            <fullPatternLayout class="ch.qos.logback.classic.PatternLayout">
                <pattern>%m%n</pattern>
            </fullPatternLayout>
            <numbersAsString>false</numbersAsString>
            <staticField>app_name:backend</staticField>
            <staticField>os_arch:${os.arch}</staticField>
            <staticField>os_name:${os.name}</staticField>
            <staticField>os_version:${os.version}</staticField>
        </encoder>
    </appender>

    <appender name="ASYNC GELF" class="ch.qos.logback.classic.AsyncAppender">
        <appender-ref ref="GELF" />
    </appender>

    <root level="debug">
        <appender-ref ref="ASYNC GELF" />
    </root>

</configuration>

Configuration

Appender

de.siegmar.logbackgelf.GelfUdpAppender

graylogHost: IP or hostname of graylog server. If the hostname resolves to multiple ip addresses, round robin will be used.
graylogPort: Port of graylog server. Default: 12201.
encoder: See Encoder configuration below.
maxChunkSize: Maximum size of GELF chunks in bytes. Default chunk size is 508 - this prevents IP packet fragmentation. This is also the recommended minimum. Maximum supported chunk size is 65,467 bytes.
useCompression: If true, compression of GELF messages is enabled. Default: true.

de.siegmar.logbackgelf.GelfTcpAppender

graylogHost: IP or hostname of graylog server. If the hostname resolves to multiple ip addresses, round robin will be used.
graylogPort: Port of graylog server. Default: 12201.
encoder: See Encoder configuration below.
connectTimeout: Maximum time (in milliseconds) to wait for establishing a connection. A value of 0 disables the connect timeout. Default: 15,000 milliseconds.
reconnectInterval: Time interval (in seconds) after an existing connection is closed and re-opened. A value of -1 disables automatic reconnects. Default: 60 seconds.
maxRetries: Number of retries. A value of 0 disables retry attempts. Default: 2.
retryDelay: Time (in milliseconds) between retry attempts. Ignored if maxRetries is 0. Default: 3,000 milliseconds.
poolSize: Number of concurrent tcp connections (minimum 1). Default: 2.
poolMaxWaitTime: Maximum amount of time (in milliseconds) to wait for a connection to become available from the pool. A value of -1 disables the timeout. Default: 5,000 milliseconds.

de.siegmar.logbackgelf.GelfTcpTlsAppender

Everything from GelfTcpAppender
trustAllCertificates: If true, trust all TLS certificates (even self signed certificates). You should not use this in production! Default: false.

Encoder

de.siegmar.logbackgelf.GelfEncoder

originHost: Origin hostname - will be auto detected if not specified.
includeRawMessage: If true, the raw message (with argument placeholders) will be sent, too. Default: false.
includeMarker: If true, logback markers will be sent, too. Default: true.
includeMdcData: If true, MDC keys/values will be sent, too. Default: true.
includeCallerData: If true, caller data (source file-, method-, class name and line) will be sent, too. Default: false.
includeRootCauseData: If true, root cause exception of the exception passed with the log message will be exposed in the root_cause_class_name and root_cause_message fields. Default: false.
includeLevelName: If true, the log level name (e.g. DEBUG) will be sent, too. Default: false.
levelNameKey: The key (i.e. the field name) that should be used for the log level name. This is only relevant when includeLevelName is trueö. Default: level_name.
appendNewline: If true, a system depended newline separator will be added at the end of each message. Don't use this in conjunction with TCP or UDP appenders, as this is only reasonable for console logging!
shortPatternLayout: Short message format. Default: "%m%nopex".
fullPatternLayout: Full message format (Stacktrace). Default: "%m%n".
numbersAsString: Log numbers as String. Default: true (will be changed in next major release).
staticFields: Additional, static fields to send to graylog. Defaults: none.

Contribution

Fork
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Add test(s)
Commit
Send me a pull request

Copyright

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

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Logback GELF

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