Although php offical image has provided docker-php-ext-installer to help user install php extension, we still need to build some extension by ourself, because it hasn't include all extensions,such like memcache.
php:7-fpm
I use https://github.com/websupport-sk/pecl-memcache/archive/php7.zip to build memcache for php7
[PHP Modules]
Core
ctype
curl
date
dom
fileinfo
filter
gd
hash
iconv
json
ldap
libxml
mbstring
mcrypt
memcache
mysqli
mysqlnd
openssl
pcre
PDO
pdo_mysql
pdo_sqlite
Phar
posix
readline
Reflection
session
SimpleXML
SPL
sqlite3
standard
tokenizer
xml
xmlreader
xmlwriter
zip
zlib
[Zend Modules]