卸载linux自带的httpd服务：

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方法一：

#rpm -e httpd

结果，出现以下错误

httpd-mmn = 20020628 is needed by (installed) mod_perl-1.99_07-5
httpd-mmn = 20020628 is needed by (installed) mod_python-3.0.1-3
httpd-mmn = 20020628 is needed by (installed) mod_ssl-2.0.40-21
httpd-mmn = 20020628 is needed by (installed) php-4.2.2-17
libapr.so.0 is needed by (installed) mod_perl-1.99_07-5
libaprutil.so.0 is needed by (installed) mod_perl-1.99_07-5
webserver is needed by (installed) webalizer-2.01_10-11
httpd >= 2.0.40 is needed by (installed) mod_perl-1.99_07-5
httpd >= 2.0.40 is needed by (installed) mod_python-3.0.1-3
httpd is needed by (installed) mod_ssl-2.0.40-21

要卸载这些东西还应该卸载它的依赖包，于是

#rpm -e mod_ssl
#rpm -e mod_python
#rpm -e mod_perl
#rpm -e webalizer

把所有的依赖包都卸载后

再次 #rpm -e httpd 成功！

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方法二：

#rpm -e httpd --nodeps可以不用卸载这些依赖包