Nginx log Configuration

Log_format is used to set the log record format:

Log_format name format

Name indicates the format name, and format indicates the equivalent format. Log_format has a default combined log format, which is equivalent to apache combined log format, as shown below:

Log_format combined '$ remote_addr-$ remote_user [$ time_local]'

'"$ Request" $ status $ body_bytes_sent'

'"$ Http_referer" "$ http_user_agent "';

If nginx is in the Server Load balancer, squid, and nginx reverse proxy, the web server cannot directly obtain the real IP address of the client. $ Remote_addr: Obtain the IP address of the reverse proxy. The Reverse Proxy Server adds X-Forwarded-For information in the http header of the Forwarded request to record the Client IP address and the server address of the client request. As follows:

Log_format porxy '$ http_x_forwarded_for-$ remote_user [$ time_local]'

'"$ Request" $ status $ body_bytes_sent'

'"$ Http_referer" "$ http_user_agent "';

The parameter annotations are as follows:

$ Remote_addr, $ http_x_forwarded_for record the Client IP Address

$ Remote_user record the client User Name

$ Time_local records the access time

$ Request records the request URL and HTTP protocol

$ Status records the Request status

$ Body_bytes_sent record size of the file sent to the client

$ Http_referer records the access from which page Link

$ Http_user_agent: Record client browser Information

Access_log is used to specify the log file path:

Access_log path [format [buffer = size | off]

Buffer sets the size of the memory cache area.

No logs:

Access_log off;

Use the default combined format to record logs:

Access_log logs/access. log or access_log logs/access. log combined;

Use the custom log format:

Access_log logs/access. log proxy buffer = 32 k;

Each server_name corresponds to one log file:

Access_log logs/$ server_name.log combined;

The log file contains variables. Pay attention to the following issues:

Buffer is not used

For each log record, the file is opened first, then the log is written, and then disabled. You can use open_log_file_cache to set the Log File Cache (off by default). The format is as follows:

Open_log_file_cache max = n [inactive = time] [min_uses = n] [valid = time] | off

The parameter annotations are as follows:

Max: sets the maximum number of file descriptors in the cache. The LRU algorithm is used.

Inactive: Set the survival time. The default value is 10 s.

Min_uses: sets the minimum number of log files used, and the log file descriptor is recorded in the cache. The default value is 1.

Valid: sets the check frequency. The default value is 60 s.