How can I install the php memcached extension on Docker's PHP7 Alpine image?

Question

The official php7 docker image has the following example:

FROM php:7.0-fpm
RUN apt-get update && apt-get install -y libmemcached-dev \
    && pecl install memcached \
    && docker-php-ext-enable memcached

I'm trying to use FROM php:7.0-fpm-alpine:

RUN apk add --update --no-cache libmemcached-dev
RUN      pecl install memcached && docker-php-ext-enable memcached

PECL gives this error:

pecl/memcached requires PHP (version >= 5.2.0, version <= 6.0.0, excluded versions: 6.0.0), installed version is 7.0.13

How can I install the memcached php extension on alpine?

Answer 1

Try it.

FROM php:7.2.10-fpm-alpine3.7


# Install PHP Extensions (igbinary & memcached)
RUN apk add --no-cache --update libmemcached-libs zlib
RUN set -xe && \
    cd /tmp/ && \
    apk add --no-cache --update --virtual .phpize-deps $PHPIZE_DEPS && \
    apk add --no-cache --update --virtual .memcached-deps zlib-dev libmemcached-dev cyrus-sasl-dev && \
# Install igbinary (memcached's deps)
    pecl install igbinary && \
# Install memcached
    ( \
        pecl install --nobuild memcached && \
        cd "$(pecl config-get temp_dir)/memcached" && \
        phpize && \
        ./configure --enable-memcached-igbinary && \
        make -j$(nproc) && \
        make install && \
        cd /tmp/ \
    ) && \
# Enable PHP extensions
    docker-php-ext-enable igbinary memcached && \
    rm -rf /tmp/* && \
    apk del .memcached-deps .phpize-deps