Document on how to manage log files

Author: vishesh92

source/adminguide/management.rst

@@ -517,6 +517,29 @@ rules.
    the global configuration.
 
 
+Managing log files
+------------------
+
+The log files are located in `/var/log/cloudstack`. This directory has the
+following subdirectories:
+
+- `management` for the Management Server
+- `usage` for the Usage Server
+- `agent` for the Agent for KVM hosts
+
+CloudStack uses log4j2 to manage log files. The log4j2 configuration file
+is located in the corresponding subdirectories in the `/etc/cloudstack/` 
+directory and is named `log4j-cloud.xml`.
+
+By default, cloudstack uses `TimeBasedTriggeringPolicy` which rolls over
+the log file every day and are kept indefinitely. The log files are 
+compressed and archived in the same directory.
+
+Over time, the logs can fill up the entire disk space. To avoid this, you can 
+update the log4j-cloud.xml file to change the log file rollover and retention 
+policy. You can checkout some configuration recipes from the log4j2 documentation
+`here <https://logging.apache.org/log4j/2.x/manual/appenders/rolling-file.html#recipes>`_.
+
 Stopping and Restarting the Management Server
 ---------------------------------------------------