GitLab PHP docker image - the requested PHP extension gd is missing from your system

Question

I'm writing some unit tests for our application and we're using GitLab CI with GitLab Runner v11.11.1 and using Docker executor with image php:7.1.

When running composer install (our composer version is 1.10.17) I get the following error on a few required packages:

the requested PHP extension gd is missing from your system

I've tried a couple things like on our gitlab-ci.yml:

apt-get update -yqq
apt-get install -yqq libpng-dev

But that also produced the same error.

I also tried requiring ext-gd from the composer.json file:

composer require ext-gd

But I got this error:

The requested PHP extension ext-gd ^7.1 is missing from your system. Install or enable PHP's gd extension.

The last attempt I made was:

apt-get install php-common
phpenmod gd

But this gave me this error:

Unable to locate package php-common

---

Does anyone know how to simply enable the PHP extension gd so I can run my unit tests?

Answer 1

You need PHP GD library. For Debian and Debian based systems, e.g. Ubuntu, as well as Debian based Docker containers use:

apt-get install -qy php-gd

If it's still unclear, or you have older/other system just search

apt-cache search php gd

and will find out possible package candidates.

For Docker containers it seems you need a different route, so Dockerfile:

FROM php:7.1-apache-buster
RUN apt-get update
RUN apt-get upgrade -qqy
RUN php -v
RUN apt-get install -qy libpng-dev
RUN docker-php-ext-install gd