Installing XDebug in Docker

I'm trying to install the XDebug in a Docker container, but I'm getting the following error:

E: Unable to locate package php-xdebug

This is my Dockerfile:

FROM php:7.0-apache

RUN a2enmod rewrite

RUN docker-php-ext-install pdo pdo_mysql

RUN apt-get install php-xdebug -y

COPY php.ini /usr/local/etc/php/
COPY . /var/www/html/

When I'm running the same command in my computer, the XDebug is getting installed without any error:

apt-get install php-xdebug

Where might the problem be?

Solution

I solved this by adding the following lines into my Docker file:

# "xdebug-2.9.0" for PHP<=7.4 — "xdebug" (3) for PHP>=8
ARG XDEBUG_VERSION="xdebug-2.9.0"

FROM php:7.0-apache

RUN a2enmod rewrite

RUN docker-php-ext-install pdo pdo_mysql

RUN yes | pecl install ${XDEBUG_VERSION} \
    && echo "zend_extension=$(find /usr/local/lib/php/extensions/ -name xdebug.so)" > /usr/local/etc/php/conf.d/xdebug.ini \
    && echo "xdebug.remote_enable=on" >> /usr/local/etc/php/conf.d/xdebug.ini \
    && echo "xdebug.remote_autostart=off" >> /usr/local/etc/php/conf.d/xdebug.ini


COPY php.ini /usr/local/etc/php/
COPY . /var/www/html/