使用flog快速生成测试日志

> wget https://github.com/mingrammer/flog/releases/download/v0.4.3/flog_0.4.3_linux_amd64.tar.gz
> tar xf flog_0.4.3_linux_amd64.tar.gz

> ./flog -h                                              
flog is a fake log generator for common log formats

Usage: flog [options]

Version: 0.4.3

Options:
  -f, --format string      log format. available formats:
                           - apache_common (default)
                           - apache_combined
                           - apache_error
                           - rfc3164
                           - rfc5424
                           - json
  -o, --output string      output filename. Path-like is allowed. (default "generated.log")
  -t, --type string        log output type. available types:
                           - stdout (default)
                           - log
                           - gz
  -n, --number integer     number of lines to generate.
  -b, --bytes integer      size of logs to generate (in bytes).
                           "bytes" will be ignored when "number" is set.
  -s, --sleep duration     fix creation time interval for each log (default unit "seconds"). It does not actually sleep.
                           examples: 10, 20ms, 5s, 1m
  -d, --delay duration     delay log generation speed (default unit "seconds").
                           examples: 10, 20ms, 5s, 1m
  -p, --split-by integer   set the maximum number of lines or maximum size in bytes of a log file.
                           with "number" option, the logs will be split whenever the maximum number of lines is reached.
                           with "byte" option, the logs will be split whenever the maximum size in bytes is reached.
  -w, --overwrite          overwrite the existing log files.
  -l, --loop               loop output forever until killed.


最常用的就是生成json格式的log，我这里是生成10w行的日志，每1w行分一个文件存储。
> ./flog -f json -o test.log -t log -n 100000 -w -p 10000

> ls -lhrt
-rw-r--r--  1 root       root       2.7M 2025-05-24 18:35 test.log
-rw-r--r--  1 root       root       2.7M 2025-05-24 18:35 test1.log
-rw-r--r--  1 root       root       2.7M 2025-05-24 18:35 test2.log
-rw-r--r--  1 root       root       2.7M 2025-05-24 18:35 test3.log
-rw-r--r--  1 root       root       2.7M 2025-05-24 18:35 test4.log
-rw-r--r--  1 root       root       2.7M 2025-05-24 18:35 test5.log
-rw-r--r--  1 root       root       2.7M 2025-05-24 18:35 test6.log
-rw-r--r--  1 root       root       2.7M 2025-05-24 18:35 test7.log
-rw-r--r--  1 root       root       2.7M 2025-05-24 18:35 test8.log
-rw-r--r--  1 root       root       2.7M 2025-05-24 18:35 test9.log

> head -3 test1.log    可以看到日志有点像nginx的access_log                                
{"host":"47.24.93.98", "user-identifier":"-", "datetime":"24/May/2025:18:35:15 +0800", "method": "PATCH", "request": "/empower/action-items/revolutionary/engineer", "protocol":"HTTP/1.0", "status":203, "bytes":18386, "referer": "http://www.productapplications.com/e-business/enhance"}
{"host":"46.109.206.239", "user-identifier":"schimmel6115", "datetime":"24/May/2025:18:35:15 +0800", "method": "HEAD", "request": "/virtual", "protocol":"HTTP/1.1", "status":400, "bytes":20172, "referer": "http://www.directworld-class.com/scale/unleash/frictionless"}
{"host":"54.184.59.83", "user-identifier":"walter6763", "datetime":"24/May/2025:18:35:15 +0800", "method": "PUT", "request": "/visualize/utilize/vortals/incubate", "protocol":"HTTP/1.1", "status":504, "bytes":18143, "referer": "https://www.internalcultivate.org/transition/content"}


如果要不断生成日志，直到按ctrl+c才停止，可以使用下面的命令写法
> ./flog -o test.log -t log -w -f json --loop