定义Dockerfile,采用官方php镜像安装，下面安装了拓展:
FROM php:5.6-fpm RUN apt-get update && apt-get install -y libfreetype6-dev libjpeg62-turbo-dev libmcrypt-dev libpng12-dev && docker-php-ext-install -j$(nproc) iconv mcrypt gd MySQLi mysql pdo pdo_mysql && docker-php-ext-configure gd --with-freetype-dir=/usr/include/ --with-jpeg-dir=/usr/include/ && docker-php-ext-enable mysql
docker-php-ext-install [-jN] ext-name [ext-name ...]
安装模块，docker-php-ext-install，如mysql模块：’docker-php-ext-install mysql’
可能的模块： bcmath bz2 calendar ctype curl dba dom enchant exif fileinfo filter ftp gd gettext gmp hash iconv imap interbase intl json ldap mbstring mcrypt mssql mysql mysqli oci8 odbc opcache pcntl pdo pdo_dblib pdo_firebird pdo_mysql pdo_oci pdo_odbc pdo_pgsql pdo_sqlite pgsql phar posix pspell readline recode reflection session shmop simplexml snmp soap sockets spl standard sybase_ct sysvmsg sysvsem sysvshm tidy tokenizer wddx xml xmlreader xmlrpc xmlwriter xsl zip
docker-php-ext-enable [options] module-name [module-name ...]
启用模块，docker-php-ext-enable，如’mysqli’模块：’docker-php-ext-enable mysql’
可能的模块： gd.so iconv.so mcrypt.so mysql.so mysqli.so opcache.so pdo.so pdo_mysql.so
docker-php-ext-configure ext-name [configure flags]
配置模块,docker-php-ext-configure,如gd配置：docker-php-ext-configure gd --with-freetype-dir=/usr/include/ --with-jpeg-dir=/usr/include/
可能的值： bcmath bz2 calendar ctype curl dba dom enchant exif fileinfo filter ftp gd gettext gmp hash iconv imap interbase intl json ldap mbstring mcrypt mssql mysql mysqli oci8 odbc opcache pcntl pdo pdo_dblib pdo_firebird pdo_mysql pdo_oci pdo_odbc pdo_pgsql pdo_sqlite pgsql phar posix pspell readline recode reflection session shmop simplexml snmp soap sockets spl standard sybase_ct sysvmsg sysvsem sysvshm tidy tokenizer wddx xml xmlreader xmlrpc xmlwriter xsl zip
如果需要安装外置拓展必须要用到pecl命令，如安装redis:pecl install redis-3.1.0.
最后要启用docker-php-ext-enable redis
定义docker-compose.yml:
php: build: ./php container_name: php56 expose: - 9000 volumes: - /data/wwwroot:/var/www/html/data/wwwroot restart: always external_links: - mysql
这样在我们的php连接数据的host可以采用mysql去代替
