背景:
1.做了图片上传小项目。
2.图片上传,需要多图管理。
3.图片上传,需要存储到Fastdfs。
4.Fastdfs上的图片,和Nginx结合。
5.Nginx从Fastdfs获得的图片,需要使用缩略图。
a.在不需要缩略图,小图的情况下,可以使用原图。
b.需要缩略图的情况下,指定目标宽度和高度,获得指定宽度和高度的缩略图。


关键的几个参考资料
1.安装成功的nginx如何添加未编译安装模块
http://blog.csdn.net/gebitan505/article/details/17612845
2.nginx命令:启动,停止及命令参数详解
http://blog.csdn.net/aidenliu/article/details/6413342
3.nginx图片过滤处理模块http_image_filter_module安装配置笔记



第1步:查看nginx编译安装时的命令,安装了哪些模块
/usr/local/nginx/sbin/nginx -V

nginx version: nginx/1.8.0
built by gcc 4.4.7 20120313 (Red Hat 4.4.7-4) (GCC)
configure arguments: --add-module=/root/soft/fastdfs-nginx-module-master/src


cd /root/soft/nginx-1.8.0
./configure --prefix=/root/soft/ --add-module=/root/soft/fastdfs-nginx-module-master/src --with-http_image_filter_module --with-http_realip_module --with-debug
报错啦
./configure: error: the HTTP image filter module requires the GD library.
You can either do not enable the module or install the libraries.

第2步:安装the GD library
#这种不行,我自己YY的
yum install gd
Running Transaction
Installing : libXpm-3.5.10-2.el6.x86_64 1/2
Installing : gd-2.0.35-11.el6.x86_64 2/2
Verifying : libXpm-3.5.10-2.el6.x86_64 1/2
Verifying : gd-2.0.35-11.el6.x86_64 2/2


Installed:
gd.x86_64 0:2.0.35-11.el6


Dependency Installed:
libXpm.x86_64 0:3.5.10-2.el6


Complete!
按照自己yy的方式,无法启动。
百度搜索“the HTTP image filter module requires the GD library”,找到以下方式~
#这种方式可以
yum install gd-devel
Installed:
gd-devel.x86_64 0:2.0.35-11.el6


Dependency Installed:
fontconfig-devel.x86_64 0:2.8.0-5.el6 freetype-devel.x86_64 0:2.3.11-15.el6_6.1 libX11-devel.x86_64 0:1.6.0-6.el6
libXau-devel.x86_64 0:1.0.6-4.el6 libXpm-devel.x86_64 0:3.5.10-2.el6 libXt.x86_64 0:1.1.4-6.1.el6
libjpeg-turbo-devel.x86_64 0:1.2.1-3.el6_5 libpng-devel.x86_64 2:1.2.49-1.el6_2 libxcb-devel.x86_64 0:1.9.1-3.el6
xorg-x11-proto-devel.noarch 0:7.7-9.el6


Dependency Updated:
fontconfig.x86_64 0:2.8.0-5.el6 freetype.x86_64 0:2.3.11-15.el6_6.1 libX11.x86_64 0:1.6.0-6.el6 libX11-common.noarch 0:1.6.0-6.el6
libxcb.x86_64 0:1.9.1-3.el6


Complete!


第3步:这个目录下有二进制文件
/root/soft/nginx-1.8.0/objs


仍然在“/root/soft/nginx-1.8.0”这个目录下


原来的nginx二进制文件
-rwxr-xr-x 1 root root 3322288 Oct 29 14:29 nginx


编译生成的Nginx
-rwxr-xr-x 1 root root 3480087 Nov 5 18:10 nginx
稍微变大了一点,这应该是增加了一个模块的效果


cp ./objs/nginx /usr/local/nginx/sbin/


[[email protected] nginx-1.8.0]# cp ./objs/nginx /usr/local/nginx/sbin/
cp: overwrite `/usr/local/nginx/sbin/nginx'? y
cp: cannot create regular file `/usr/local/nginx/sbin/nginx': Text file busy


第4步:停止Nginx的2个进程,再次cp
[[email protected] conf]# ps -ef|grep nginx
root 11648 5064 0 18:18 pts/0 00:00:00 grep nginx
root 30321 1 0 Oct29 ? 00:00:00 nginx: master process /usr/local/nginx/sbin/nginx
nobody 30322 30321 0 Oct29 ? 00:00:08 nginx: worker process
[[email protected] conf]# ps -ef|grep nginx
root 11668 5064 0 18:19 pts/0 00:00:00 grep nginx
root 30321 1 0 Oct29 ? 00:00:00 nginx: master process /usr/local/nginx/sbin/nginx
nobody 30322 30321 0 Oct29 ? 00:00:08 nginx: worker process
[[email protected] conf]# kill -9 30321
[[email protected] conf]# ps -ef|grep nginx
root 11670 5064 0 18:19 pts/0 00:00:00 grep nginx
nobody 30322 1 0 Oct29 ? 00:00:08 nginx: worker process
[[email protected] conf]# kill -9 30322
[[email protected] conf]# ps -ef|grep nginx
root 11672 5064 0 18:19 pts/0 00:00:00 grep nginx
重新执行cp命令




第5步:检查配置,发现启动报错
[[email protected] conf]# /usr/local/nginx/sbin/nginx -t
nginx: [alert] could not open error log file: open() "/root/soft//logs/error.log" failed (2: No such file or directory)
2015/11/05 18:20:52 [emerg] 11697#0: open() "/root/soft//conf/nginx.conf" failed (2: No such file or directory)
nginx: configuration file /root/soft//conf/nginx.conf test failed


应该是编译制定了--prefix /root/soft导致的,之前安装的时候,没有指定,默认可能是“/usr/local”.


第6步:可以通过指定配置文件的路径,来启动~
nginx -c
  此命令参数指定一个新的nginx配置文件来替换默认的nginx配置文件,如果你不确定新的nginx配置文件语法是否正确,你可以通过nginx命令-t参数来测试,-t参数代表不运行配置文件,而仅仅只是测试配置文件,即
nginx -t -c


这次,我还是重新编译算了~
./configure --prefix=/usr/local/nginx --add-module=/root/soft/fastdfs-nginx-module-master/src --with-http_image_filter_module --with-http_realip_module --with-debug
make
cp ./objs/nginx /usr/local/nginx/sbin/


第7步:image_filter指令,不会再报错了。
location ~ group1/M00/(.+)\.?(.+){
alias /home/fastdata/data;
ngx_fastdfs_module;
image_filter resize 200 220;
}