使用cronolog可以格式化日志文件的格式，比如按时间分割，易于管理和分析。
cronolog的安装配置非常简单，简要说明如下:
1.下载软件
2.解压缩
gzip -d cronolog-1.6.2.tar.gz
tar xf cronolog-1.6.2.tar
2.进入相应的目录 ./configure
3.make
4.make install
5.修改apache配置文件
以下是我的安装日志，供大家参考:
[root@eygle opt]# wget
--08:05:12--
=> `cronolog-1.6.2.tar.gz'
Resolving cronolog.org... done.
Connecting to cronolog.org[217.160.212.212]:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 133,591 [application/x-gzip]
100%[==================================>] 133,591 26.23K/s ETA 00:00
08:05:19 (26.23 KB/s) - `cronolog-1.6.2.tar.gz' saved [133591/133591]
[root@eygle opt]# gzip -d cronolog-1.6.2.tar.gz
[root@eygle opt]# tar xf cronolog-1.6.2.tar
[root@eygle opt]# cd cronolog-1.6.2
[root@eygle cronolog-1.6.2]# ls
aclocal.m4 config.cache configure cronolog.spec install-sh Makefile.am
mkinstalldirs src
AUTHORS config.log configure.in doc lib Makefile.in NEWS
testsuite
ChangeLog config.status COPYING INSTALL Makefile missing README
TODO
[root@eygle cronolog-1.6.2]# ./configure
loading cache ./config.cache
checking for a BSD compatible install... (cached) /usr/bin/install -c
checking whether build environment is sane... yes
checking whether make sets ${MAKE}... (cached) yes
checking for working aclocal... found
checking for working autoconf... found
checking for working automake... found
checking for working autoheader... found
checking for working makeinfo... found
checking for gcc... (cached) gcc
checking whether the C compiler (gcc ) works... yes
checking whether the C compiler (gcc ) is a cross-compiler... no
checking whether we are using GNU C... (cached) yes
checking whether gcc accepts -g... (cached) yes
checking for a BSD compatible install... /usr/bin/install -c
checking whether ln -s works... (cached) yes
checking for ranlib... (cached) ranlib
checking for perl... (cached) /usr/bin/perl
checking how to run the C preprocessor... (cached) gcc -E
checking for ANSI C header files... (cached) yes
checking whether stat file-mode macros are broken... (cached) no
checking whether time.h and sys/time.h may both be included... (cached) yes
checking whether struct tm is in sys/time.h or time.h... (cached) time.h
checking for tm_zone in struct tm... (cached) yes
checking for fcntl.h... (cached) yes
checking for limits.h... (cached) yes
checking for unistd.h... (cached) yes
checking for working const... (cached) yes
checking for size_t... (cached) yes
checking whether struct tm is in sys/time.h or time.h... (cached) time.h
checking for strftime... (cached) yes
checking for vprintf... (cached) yes
checking for mkdir... (cached) yes
checking for mktime... (cached) yes
checking for putenv... (cached) yes
checking for strptime... (cached) yes
checking for localtime_r... (cached) yes
creating ./config.status
creating Makefile
creating lib/Makefile
creating src/Makefile
creating doc/Makefile
creating testsuite/Makefile
creating src/cronosplit
[root@eygle cronolog-1.6.2]# make
Making all in lib
make[1]: Entering directory `/opt/cronolog-1.6.2/lib'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/opt/cronolog-1.6.2/lib'
Making all in src
make[1]: Entering directory `/opt/cronolog-1.6.2/src'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/opt/cronolog-1.6.2/src'
Making all in doc
make[1]: Entering directory `/opt/cronolog-1.6.2/doc'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/opt/cronolog-1.6.2/doc'
Making all in testsuite
make[1]: Entering directory `/opt/cronolog-1.6.2/testsuite'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/opt/cronolog-1.6.2/testsuite'
make[1]: Entering directory `/opt/cronolog-1.6.2'
make[1]: Nothing to be done for `all-am'.
make[1]: Leaving directory `/opt/cronolog-1.6.2'
[root@eygle cronolog-1.6.2]# make install
Making install in lib
make[1]: Entering directory `/opt/cronolog-1.6.2/lib'
make[2]: Entering directory `/opt/cronolog-1.6.2/lib'
make[2]: Nothing to be done for `install-exec-am'.
make[2]: Nothing to be done for `install-data-am'.
make[2]: Leaving directory `/opt/cronolog-1.6.2/lib'
make[1]: Leaving directory `/opt/cronolog-1.6.2/lib'
Making install in src
make[1]: Entering directory `/opt/cronolog-1.6.2/src'
make[2]: Entering directory `/opt/cronolog-1.6.2/src'
/bin/sh ../mkinstalldirs /usr/local/sbin
/usr/bin/install -c cronolog /usr/local/sbin/cronolog
/bin/sh ../mkinstalldirs /usr/local/sbin
/usr/bin/install -c cronosplit /usr/local/sbin/cronosplit
make[2]: Nothing to be done for `install-data-am'.
make[2]: Leaving directory `/opt/cronolog-1.6.2/src'
make[1]: Leaving directory `/opt/cronolog-1.6.2/src'
Making install in doc
make[1]: Entering directory `/opt/cronolog-1.6.2/doc'
make[2]: Entering directory `/opt/cronolog-1.6.2/doc'
make[2]: Nothing to be done for `install-exec-am'.
/bin/sh ../mkinstalldirs /usr/local/info
/usr/bin/install -c -m 644 ./cronolog.info /usr/local/info/cronolog.info
install-info --info-dir=/usr/local/info /usr/local/info/cronolog.info
make install-man1
make[3]: Entering directory `/opt/cronolog-1.6.2/doc'
/bin/sh ../mkinstalldirs /usr/local/man/man1
/usr/bin/install -c -m 644 ./cronolog.1m /usr/local/man/man1/cronolog.1m
/usr/bin/install -c -m 644 ./cronosplit.1m /usr/local/man/man1/cronosplit.1m
make[3]: Leaving directory `/opt/cronolog-1.6.2/doc'
make[2]: Leaving directory `/opt/cronolog-1.6.2/doc'
make[1]: Leaving directory `/opt/cronolog-1.6.2/doc'
Making install in testsuite
make[1]: Entering directory `/opt/cronolog-1.6.2/testsuite'
make[2]: Entering directory `/opt/cronolog-1.6.2/testsuite'
make[2]: Nothing to be done for `install-exec-am'.
make[2]: Nothing to be done for `install-data-am'.
make[2]: Leaving directory `/opt/cronolog-1.6.2/testsuite'
make[1]: Leaving directory `/opt/cronolog-1.6.2/testsuite'
make[1]: Entering directory `/opt/cronolog-1.6.2'
make[2]: Entering directory `/opt/cronolog-1.6.2'
make[2]: Nothing to be done for `install-exec-am'.
make[2]: Nothing to be done for `install-data-am'.
make[2]: Leaving directory `/opt/cronolog-1.6.2'
make[1]: Leaving directory `/opt/cronolog-1.6.2'
[root@eygle cronolog-1.6.2]# which cronolog
/usr/local/sbin/cronolog
安装完成以后需要对apache进行适当配置，修改httpd.conf文件，主要注意以下几点:
1.自定义日志格式
LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined
SetEnvIf Request_URI \.gif$ gif-image
SetEnvIf Request_URI \.GIF$ gif-image
SetEnvIf Request_URI \.jpg$ gif-image
SetEnvIf Request_URI \.JPG$ gif-image
SetEnvIf Request_URI \.png$ gif-image
SetEnvIf Request_URI \.swf$ gif-image
SetEnvIf Request_URI \.SWF$ gif-image
SetEnvIf Request_URI \.css$ gif-image
SetEnvIf Request_URI \.CSS$ gif-image
SetEnvIf Request_URI \.js$ gif-image
SetEnvIf Request_URI \.JS$ gif-image
SetEnvIf Request_URI \.ico$ gif-image
2.如果存在多个虚拟站点
可以考虑在VirtualHost进行相应设置
ServerAdmin
DocumentRoot /www/docs/dummy-host.example.com
ServerName dummy-host.example.com
ErrorLog logs/dummy-host.example.com-error_log
CustomLog "|/usr/local/sbin/cronolog /backup/logs/www/access_log.%Y%m%d" combined env=!gif-image
我的存在多个子站点，但是都使用了同一个日志文件配置后生成日志文件的效果:
[root@eygle logs]# ls -l access_log.20041226
-rw-r--r-- 1 root root 110425 Dec 26 09:10 access_log.20041226
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