安装完centos7.2后，卸载掉不需要的自带软件，卸载Apache的时候，卸载不了。步骤是这样的：
1、停止httpd服务 # systemctl stop httpd.service //服务并没有启用
2、查看apache包 # rpm -qa|grep httpd //什么都没有
所以改用 # yum list|grep httpd //内容如下
darkhttpd.x86_64 1.11-1.el7 epel
httpd.x86_64 2.4.6-40.el7.centos base
httpd-devel.x86_64 2.4.6-40.el7.centos base
httpd-itk.x86_64 2.4.7.01-5.el7 epel
httpd-manual.noarch 2.4.6-40.el7.centos base
httpd-tools.x86_64 2.4.6-40.el7.centos base
libmicrohttpd.i686 0.9.33-2.el7 base
libmicrohttpd.x86_64 0.9.33-2.el7 base
libmicrohttpd-devel.i686 0.9.33-2.el7 base
libmicrohttpd-devel.x86_64 0.9.33-2.el7 base
libmicrohttpd-doc.noarch 0.9.33-2.el7 base
lighttpd.x86_64 1.4.39-1.el7 epel
lighttpd-fastcgi.x86_64 1.4.39-1.el7 epel
lighttpd-mod_geoip.x86_64 1.4.39-1.el7 epel
lighttpd-mod_mysql_vhost.x86_64 1.4.39-1.el7 epel
opensips-httpd.x86_64 1.10.5-3.el7 epel
owncloud-httpd.noarch 8.0.10-1.el7 epel
python-sphinxcontrib-httpdomain.noarch 1.4.0-1.el7 epel
radicale-httpd.noarch 1.1.1-1.el7 epel
viewvc-httpd-fcgi.noarch 1.1.24-1.el7 epel
viewvc-httpd-wsgi.noarch 1.1.24-1.el7 epel
web-assets-httpd.noarch 5-1.el7 epel 3、执行删除 # yum erase httpd.x86_64 //执行删除，内容如下
Loaded plugins: langpacks
No Match for argument: httpd.x86_64
No Packages marked for removal应该怎么办？
用yum进行删除包操作的语法如下（erase是remove的别名，建议用remove）：
yum remove package_nameApache的package_name就是httpd，所以，正确的操作是：
yum remove httpd另外，进行上面的操作，yum会自动删除Apache的依赖