About php-fpm

[Dshufeng]

Removing intermediate container 5af2ac77fd76
Step 3 : RUN apt-get update && apt-get install -y libfreetype6-dev libjpeg62-turbo-dev libpng-dev && docker-php-ext-configure gd --with-freetype-dir=/usr/include/ --with-jpeg-dir=/usr/include/ && docker-php-ext-install gd && : && apt-get install -y libicu-dev && docker-php-ext-install intl && : && apt-get install -y libxml2-dev && apt-get install -y libxslt-dev && docker-php-ext-install soap && docker-php-ext-install xsl && docker-php-ext-install xmlrpc && docker-php-ext-install wddx && : && apt-get install -y libbz2-dev && docker-php-ext-install bz2 && : && docker-php-ext-install zip && docker-php-ext-install pcntl && docker-php-ext-install pdo_mysql && docker-php-ext-install mysqli && docker-php-ext-install mbstring && docker-php-ext-install exif && docker-php-ext-install bcmath && docker-php-ext-install calendar && docker-php-ext-install sockets && docker-php-ext-install gettext && docker-php-ext-install shmop && docker-php-ext-install sysvmsg && docker-php-ext-install sysvsem && docker-php-ext-install sysvshm && docker-php-ext-install opcache
--->## [Warning] IPv4 forwarding is disabled. Networking will not work.
---> Running in b4dc7af9e896

[Dshufeng]

解决办法：
vi /etc/sysctl.conf
添加如下代码：
net.ipv4.ip_forward=1