How to find origin of image

General Discussions
1

I have an image on my Linux dev box:

edg@edglaptop webdocker $ sudo docker image ls
REPOSITORY   TAG          IMAGE ID       CREATED        SIZE
php          8.0-apache   19cf986a8242   23 hours ago   2.09GB
edg@edglaptop webdocker $

I’m kind of at a loss as to how I built this.

I have a bunch of docker files that use this as “FROM” but none that indicate how it was built in the first place. I am concerned about relying on something I can’t reproduce.

FROM php:8.0-apache

RUN apt update
RUN apt -y upgrade
RUN apt -y install vim less git curl zip unzip mariadb-client-10.5 p7zip-full libmcrypt-dev mcrypt libzip-dev
#RUN useradd -u 1000 websites
COPY ./sites-available/010-appcollect.conf /etc/apache2/sites-available/010-appcollect.conf
RUN a2ensite 010-appcollect
RUN a2enmod rewrite
ADD https://github.com/mlocati/docker-php-extension-installer/releases/latest/download/install-php-extensions /usr/local/bin/

RUN chmod +x /usr/local/bin/install-php-extensions && \
    install-php-extensions pdo_mysql mcrypt mysqli xdebug redis zip

WORKDIR /var/www/html
~

Dockerhub has a php:7.4-apache, but not an 8.0-apache.

Any ideas as to find out what image is the parent of this one?

Thanks,
Ed Greenberg

2

The 8.0-apache tag exists:

image
image1852×393 28.4 KB

There is link in the dockerhub description that points to a list of tags, which point to the respective Dockerfile:

It depends on whether the image maintainer provides the information in the dockerhub description.