Analyzing log files
Error log file formats
Error log file entry examples
Configuring advanced logging
Debug logging
Switching binaries at runtime
Using access logs for debugging
Common configuration errors
Using if instead of try_files
Using if as a hostname switch
Not using the server context to best effect
Operating system limits
File descriptor limits
Network limits
Performance problems
Using the Stub Status module
Master Nginx(8) - Troubleshooting Techniques
原文：http://www.cnblogs.com/thlzhf/p/5657957.html