Install imagick In Docker FROM php:7.1-fpm-alpine

install-imagick-docker-php-7-1-alpine.md

docker-library/php#105

RUN set -ex \
    && apk add --no-cache --virtual .phpize-deps $PHPIZE_DEPS imagemagick-dev libtool \
    && export CFLAGS="$PHP_CFLAGS" CPPFLAGS="$PHP_CPPFLAGS" LDFLAGS="$PHP_LDFLAGS" \
    && pecl install imagick-3.4.3 \
    && docker-php-ext-enable imagick \
    && apk add --no-cache --virtual .imagick-runtime-deps imagemagick \
    && apk del .phpize-deps

Just a side note: I recently added Alpine support to my install-php-extensions script: you can easily install the imagick PHP extension (as well as many other extensions) on Alpine & Debian by running:

ADD https://raw.githubusercontent.com/mlocati/docker-php-extension-installer/master/install-php-extensions /usr/local/bin/

RUN chmod uga+x /usr/local/bin/install-php-extensions && sync && \
    install-php-extensions imagick