Log File rotation in AEM/CQ5

Statement : JVM Log file rotation parameters

Solution :

Add the below parameters in the start.bat/start.sh file of AEM:

XX:+HeapDumpOnOutOfMemoryError	— Write an heapdump if the JVM runs out of heap space
XX:+HeapDumpOnCtrlBreak	— On windows create an heapdump when pressing         ctrl+break
verbose:gc	— Verbose garbage collection logging
XX:+PrintGCTimeStamps	— Print timestamps in the GC log
XX:+PrintGCDetails	— Even more GC information
Xloggc:gc.log	— Write the GC logs to this file and not to stdout
XX:+UseGCLogFileRoatation	— Enable GC log rotation
XX:+NumberOfGCLogFiles=10	—Keep 10 versions of that GC log file

JVM Parameter	Description
§  verbose:gc	§  verbose garbage collection logging
§  XX:+PrintGCTimeStamps	§  print timestamps in the GC log
§  XX:+PrintGCDetails	§  even more GC information
§  Xloggc:gc.log	§  write the GC logs to this file and not to stdout
§  XX:+UseGCLogFileRoatation	§  (since Java 6u32 or Java 7u2) — enable GC log rotation
§  XX:+NumberOfGCLogFiles=10	§  (since Java 6u32 or Java 7u2) — and keep 10 versions of that GC log file

Log file rotation related findings

Finding ID	Title	Total Risk	Effort to fix
LR1	verbose:gc	Medium	Low
LR2	XX:+PrintGCTimeStamps	Medium	Low
LR3	XX:+PrintGCDetails	Medium	Low
LR4	Xloggc:gc.log	Medium	Low
LR5	XX:+UseGCLogFileRoatation	Medium	Low
LR6	XX:+NumberOfGCLogFiles=10	Medium	Low