CODEWITHSUNDEEP
javalog4jlog4j2
tarunkumar
tarunkumar

Reputation: 891

Approach to write log to different log files based upon tenant in muti-tenant application using log4j

In a multi tenant application I want that separate files should get created for different tenants using log4j. What could be the best possible pattern to do it without cluttering the code.

Upvotes: 0

Views: 1338

Answers (2)

tarunkumar
tarunkumar

Reputation: 891

Just an update, If used Log4j 2, one option is to use RoutingAppender

http://logging.apache.org/log4j/2.x/manual/appenders.html#RoutingAppender

In which different log files based upon user can be set into ThreadContext.

Upvotes: 1

Jérémie B
Jérémie B

Reputation: 11022

If you have one application for all of yours "tenants", you can use MDC and a MDCSiftingAppender :

log4j.appender.sift=org.apache.log4j.sift.MDCSiftingAppender
log4j.appender.sift.key=tenant
log4j.appender.sift.default=default
log4j.appender.sift.appender=org.apache.log4j.FileAppender
log4j.appender.sift.appender.layout=org.apache.log4j.PatternLayout
log4j.appender.sift.appender.layout.ConversionPattern=%d{ISO8601} | %-5.5p | %-16.16t | %-32.32c{1} | %m%n
log4j.appender.sift.appender.file=log/$\\{tenant\\}.log
log4j.appender.sift.appender.append=true

and in your code, around a code for a 'tenant' (ideally, a web request filter, or something like that) :

MDC.put("tenant", xxx)
...
MDC.remove("tenant")

Upvotes: 2

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