在centos中，配置nginx的https时，出现如下错误。
nginx: [emerg] unknown directive "ssl" in /usr/local/nginx/conf/nginx.conf:102
到解压的nginx目录下
./configure --with-http_ssl_module
默认配置路径是 /usr/local/nginx 如果想要改变路径 则为 bash ./configure --prefix=/usr/local/nginx --with-http_gzip_static_module --with-http_ssl_module
当执行上面语句，出现./configure: error: SSL modules require the OpenSSL library.
用 yum -y install openssl openssl-devel
再执行./configure
重新执行./configure --with-http_ssl_module
make ，切记不能make install 会覆盖。
把原来nginx备份
cp /usr/local/nginx/sbin/nginx /usr/local/nginx/sbin/nginx.bak
把新的nginx覆盖旧的
cp objs/nginx /usr/local/nginx/sbin/nginx
出现错误时cp: cannot create regular file ‘/usr/local/nginx/sbin/nginx’: Text file busy
用cp -rfp objs/nginx /usr/local/nginx/sbin/nginx解决
测试nginx是否正确
/usr/local/nginx/sbin/nginx -t
（nginx: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
nginx: configuration file /usr/local/nginx/conf/nginx.conf test is successful）
重启nginx
/usr/local/nginx/sbin/nginx -s reload
如果没生效的话，关闭nginx：nginx -s stop 重启nginx