1.下载安装cronolog
http://cronolog.org/download/index.html
—>  tar … && cd …&& ./configure && make && make install

2.awstats
可以参考我的awstats安装配置笔记
http://blog.zhangjianfeng.com/?p=317

3.配置http.conf
    CustomLog "|/usr/local/sbin/cronolog  /company/logs/apache/web1_access_log.%Y%m%d" combined
   …apachectl restart

4.最后就是把各台服务器的日志先同步到awstats服务器上,进行日志合并
  sort -m -t " " -k 4 -o log_all log1 log2 log3
  注释： -m: 使用 merge优化算法

5.把合并后的日志交给awstats分析即可 

 附:cronolog详细参数意义:

1. Specifier Description %% a literal % character %n a new-line character %t a horizontal tab character Time fields %H hour (00..23) %I hour (01..12) %p the locale's AM or PM indicator %M minute (00..59) %S second (00..61, which allows for leap seconds) %X the locale's time representation (e.g.: "15:12:47") %Z time zone (e.g. GMT), or nothing if the time zone cannot be determined Date fields %a the locale's abbreviated weekday name (e.g.: Sun..Sat) %A the locale's full weekday name (e.g.: Sunday .. Saturday) %b the locale's abbreviated month name (e.g.: Jan .. Dec) %B the locale's full month name, (e.g.: January .. December) %c the locale's date and time (e.g.: "Sun Dec 15 14:12:47 GMT 1996") %d day of month (01 .. 31) %j day of year (001 .. 366) %m month (01 .. 12) %U week of the year with Sunday as first day of week (00..53, where week 1 is the week containing the first Sunday of the year) %W week of the year with Monday as first day of week (00..53, where week 1 is the week containing the first Monday of the year) %w day of week (0 .. 6, where 0 corresponds to Sunday) %x locale's date representation (e.g. today in Britain: "15/12/96") %y year without the century (00 .. 99) %Y year with the century (1970 .. 2038)