说明：
已经安装好的Nginx，需要添加一个未被编译安装的模块（以nginx-rtmp-module模块为例），则需要重新编译nginx，而不是像apache一样配置文件引用.so
步骤
下载模块
以nginx-rtmp-module模块为例
# wget https://github.com/arut/nginx-rtmp-module/archive/master.zip
# unzip master.zip
# ls nginx-rtmp-module-master/
查看nginx编译安装时安装了哪些模块
# nginx -V
nginx version: nginx/1.9.5
built by gcc 4.4.7 20120313 (Red Hat 4.4.7-23) (GCC)
built with OpenSSL 1.0.1g 7 Apr 2014
TLS SNI support enabled
configure arguments: --prefix=/opt/nginx-1.9.5 --with-pcre=/home/work/software/pcre-8.38 --with-zlib=/home/work/software/zlib-1.2.8 --conf-path=/opt/nginx-1.9.5/conf/nginx.conf --pid-path=/opt/nginx-1.9.5/conf/nginx.pid --with-http_ssl_module --with-openssl=/home/work/software/openssl-1.0.1g --add-module=/home/work/software/headers-more-nginx-module-0.23 --add-module=/home/work/software/nginx-http-concat-master --with-http_gzip_static_module
可以看出编译安装时的配置使用了以下参数（将其复制出来）--prefix=/opt/nginx-1.9.5 --with-pcre=/home/work/software/pcre-8.38 --with-zlib=/home/work/software/zlib-1.2.8 --conf-path=/opt/nginx-1.9.5/conf/nginx.conf --pid-path=/opt/nginx-1.9.5/conf/nginx.pid --with-http_ssl_module --with-openssl=/home/work/software/openssl-1.0.1g --add-module=/home/work/software/headers-more-nginx-module-0.23 --add-module=/home/work/software/nginx-http-concat-master --with-http_gzip_static_module这些模块。
加入需要安装的模块
重新编译，如这里添加–add-module=/home/work/software/nginx-rtmp-module-master
# cd /home/work/software/nginx-1.9.5 //进入到nginx之前安装的目录
# ./configure --prefix=/opt/nginx-1.9.5 --with-pcre=/home/work/software/pcre-8.38 --with-zlib=/home/work/software/zlib-1.2.8 --conf-path=/opt/nginx-1.9.5/conf/nginx.conf --pid-path=/opt/nginx-1.9.5/conf/nginx.pid --with-http_ssl_module --with-openssl=/home/work/software/openssl-1.0.1g --add-module=/home/work/software/headers-more-nginx-module-0.23 --add-module=/home/work/software/nginx-http-concat-master --with-http_gzip_static_module --add-module=/home/work/software/nginx-rtmp-module-master
# make //注意：千万不要make install，不然真的就GG了
替换nginx二进制文件
# /etc/init.d/nginx stop
# cp /opt/nginx-1.9.5/sbin/nginx /opt/nginx-1.9.5/sbin/nginx.bak
# cp ./objs/nginx /opt/nginx-1.9.5/sbin/
再次确认是否安装成功
# /opt/nginx-1.9.5/sbin/nginx -V
nginx version: nginx/1.9.5
built by gcc 4.4.7 20120313 (Red Hat 4.4.7-23) (GCC)
built with OpenSSL 1.0.1g 7 Apr 2014
TLS SNI support enabled
configure arguments: --prefix=/opt/nginx-1.9.5 --with-pcre=/home/work/software/pcre-8.38 --with-zlib=/home/work/software/zlib-1.2.8 --conf-path=/opt/nginx-1.9.5/conf/nginx.conf --pid-path=/opt/nginx-1.9.5/conf/nginx.pid --with-http_ssl_module --with-openssl=/home/work/software/openssl-1.0.1g --add-module=/home/work/software/headers-more-nginx-module-0.23 --add-module=/home/work/software/nginx-http-concat-master --with-http_gzip_static_module --add-module=/home/work/software/nginx-rtmp-module-master
至此、nginx就重新编译添加模块成功了。