Set Up Logging
Set Up Logging
You configure logging in a member's gemfire.properties or at startup with gfsh.
Before you begin, make sure you understand Basic Configuration and Programming.
- Run a time synchronization service such as NTP on all GemFire host machines. This is the only way to produce logs that are useful for troubleshooting. Synchronized time stamps ensure that log messages from different hosts can be merged to accurately reproduce a chronological history of a distributed run.
- Use a sniffer to monitor your logs Look for new or unexpected warnings, errors, or severe messages. The logs output by your system have their own characteristics, indicative of your system configuration and of the particular behavior of your applications, so you must become familiar with your applications' logs to use them effectively.
- Configure member logging in each
member's gemfire.properties as needed:
# Default gemfire.properties log file settings log-level=config log-file= log-file-size-limit=0 log-disk-space-limit=0Note: You can also specify logging parameters when you start up members (either locators or servers) using the gfsh command-line utility. See start commands for various examples. In addition, you can modify log file properties and log-level settings while a member is already running by using the alter runtime command.
log-level. Options are severe
(the highest level), error,
config, and fine. The lower
levels include higher level settings, so a setting of
warning would log warning,
error, and severe messages.
For general troubleshooting, we recommend setting the log level at
config or higher. Note: The fine setting can fill up disk too quickly and impact system performance. Use fine only if asked to do so by Pivotal technical support.
- Specify the log file name
in log-file. This can be relative or absolute. If
this property is not specified, the defaults are:
Note: Make sure each member logs to its own files. This makes the logs easier to decipher.
- Standard output for applications
- For servers, the
default log file location is:
working-directory/server-name.logBy default, when starting a server through gfsh, the working -directory corresponds to the directory (named after itself) that the cache server creates upon startup. Alternatively, you can specify a different working directory path when you start the cache server. The server-name corresponds to the name of the cache server provided upon startup.
- For a standalone
locator, the default log file location is:
working-directory/locator-name.logBy default, when starting a locator through gfsh, the working -directory corresponds to the directory (named after itself) created when the locator starts up. Alternatively, you can specify a different working directory path when you start a locator. The locator-name corresponds to the name of the locator provided upon startup. If you are using a colocated or embedded locator, the locator logs will be part of the member’s log file.
- Set the maximum size of a single log file in log-file-size-limit. If not set, the single, main log file is used. If set, the metadata file, the main log, and rolled child logs are used.
- Set the maximum size of all log files in log-disk-space-limit. If non-zero, this limits the combined size of all inactive log files, deleting oldest files first to stay under the limit. A zero setting indicates no limit.
- Set log-level. Options are severe (the highest level), error, warning, info, config, and fine. The lower levels include higher level settings, so a setting of warning would log warning, error, and severe messages. For general troubleshooting, we recommend setting the log level at config or higher.
- If you are using the
gfsh command-line interface, gfsh can
creates its own log file in the directory where you run the
gfsh or gfsh.bat script. By default,
gfsh does not generate log files for itself. To enable gfsh logs, set the
following system property to the desired log level before starting
gfsh log files are named gfsh-0_0.log.