如何平滑升级Nginx

$ cd /usr/local/src
$ wget http://nginx.org/download/nginx-1.6.0.tar.gz
$ tar zxvf nginx-1.6.0.tar.gz

$ wget ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-8.34.tar.gz 
$ tar -zxvf pcre-8.34.tar.gz
$ cd pcre-8.34

$ cd /usr/local/src
$ wget http://zlib.net/zlib-1.2.8.tar.gz
$ tar -zxvf zlib-1.2.8.tar.gz
$ cd zlib-1.2.8

$ cd /usr/local/src
$ wget http://www.openssl.org/source/openssl-1.0.1c.tar.gz
$ tar -zxvf openssl-1.0.1c.tar.gz
$ cd openssl-1.0.1c

$ ./configure \
--prefix=/usr/local/nginx \
--user=www \
--group=www \
--with-http_stub_status_module \
--with-http_v2_module \
--with-http_ssl_module \
--with-http_gzip_static_module \
--with-http_realip_module \
--with-http_flv_module \
--with-http_mp4_module \
--with-openssl=../openssl \
--with-pcre=../pcre-8.41 \
--with-zlib=../zlib-1.2.8

$ make

# 重命名nginx旧版本二进制文件，即sbin目录下的nginx（期间nginx并不会停止服务！）：
$ mv /usr/local/nginx/sbin/nginx /usr/local/nginx/sbin/nginx.old
# 拷贝一份新编译的二进制文件：
$ cp objs/nginx /usr/local/nginx/sbin/

$ make upgrade

  ## 修改前
upgrade:
/usr/local/nginx/sbin/nginx -t

kill -USR2 `cat /usr/local/nginx/logs/nginx.pid`
sleep 1
test -f /usr/local/nginx/logs/nginx.pid.oldbin

kill -QUIT `cat /usr/local/nginx/logs/nginx.pid.oldbin`

  ## 修改后
  upgrade:
/usr/local/nginx/sbin/nginx -t

kill -USR2 `cat /var/run/nginx.pid`
sleep 1
test -f /var/run/nginx.pid.oldbin

kill -QUIT `cat /var/run/nginx.pid.oldbin`

$ ps aux | grep nginx

$ /usr/local/nginx/sbin/nginx -V