如果不安装 ImageMagick ，是无法使用

gem 'carrierwave'
gem 'mini_magick'
gem 'ckeditor'

这三个gem上传图片的。

 

Step 1. Install Required Packages

First we need to install required packages in order to install ImageMagic and IMagick PHP extension.

# yum install gcc php-devel php-pear

Step 2. Install ImageMagick

After installing required packages, let’s install ImageMagick using following command.

# yum install ImageMagick ImageMagick-devel

Step 3. Install ImageMagick PHP Extension

At this point you have successfully installed ImageMagick package on your system. Now are are going to install ImageMagick php extension, So that we can use it through php code.

# pecl install imagick
# echo "extension=imagick.so" > /etc/php.d/imagick.ini

Step 4. Restart Apache and Check Extension

After completing above steps you need to reload apache service to enable php exension using following command

# service httpd reload

Click here to read more details about ImageMagick setup and there uses.