syslog-ng 系列连载-32 ：安装/升级许可证

3.14. Installing and upgrading the license

The syslog-ng Premium Edition server operates only if a valid license file is present on the host. The license file is called license.txt, and is located in the same directory as the syslog-ng configuration file.

	Warning
	The license.txt file must be readable to the user running the syslog-ng process.

To install a license file, copy it to the directory where the configuration file is stored. See for the location of the license file.

To upgrade a license file, simply overwrite the old license file with the new one.

	Note
	The license file is needed only when running syslog-ng Premium Edition in server mode.

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