camptocamp / docker-tomcat-logback

Docker image for tomcat with logback integration

Docker image for tomcat with logback integration

Based on the official tomcat image, but with logs using logback.

Tunning

Some environment variables are available to tune the logs:

• DEFAULT_LOG_LEVEL: Set the default log level.
• TOMCAT_LOG_LEVEL: Set the tomcat log level.
• SENTRY_LOG_LEVEL: Set the Sentry log level.
• SENTRY_REPORTING_LOG_LEVEL: Starting from what log level to report to Sentry.
• TOMCAT_LOG_TYPE:
  • classic (default): The logs are humane readable. Access logs are going to stdout and the other logs are going to stderr.
  • json: The logs will be formatted in a JSON suitable for logstash. Access logs are going to stdout and the other logs are going to stderr.
  • logstash: The logs will be formatted in a JSON suitable for logstash (@cee) and sent by syslog/UDP. The access logs are going to stdout in json format. More variables are available for this mode:
    • TOMCAT_LOG_HOST: the target host
    • TOMCAT_LOG_PORT: the target port

If you want to change the way things are logged, change the ${CATALINA_HOME}/conf/logback-custom.xml file.

If your application uses logback/log4j, it is recommended to not ship those libraries with your webapp. Just use the ones provided at tomcat level.

Integration with Sentry

You can enable Sentry crash reports by adding a parameter to the CATALINA_OPTS environment variable with the DSN provided by sentry:

• -Dsentry.dsn=https://public:private@host:port/1

Other parameters are documented here: https://docs.sentry.io/clients/java/config/

Other changes

Other changes compared the official tomcat image:

• All the default webapps are removed.
• TLD and JAR scanners are disabled (faster startup).
• Resources caching is properly configured.

docker-tomcat-logback's Issues

JAVA_OPTS=-Dsun.net.inetaddr.ttl=30

for Oracle JDK this parameter already depricated, new one is JAVA_OPTS=-Dnetworkaddress.cache.ttl=30.