How to execute script during image build in Docker

Question

I have the following at the end of my Dockerfile:

ENTRYPOINT bash -C '/usr/local/bin/setup_php_settings';'bash'

If I am not wrong that /usr/local/bin/setup_php_settings will be executed each time the container is started. If so then I have a few installation stuff (like this ZRay for example) inside that script that I would like to move to another script that would be executed just once on image build process let's say.

The content of the setup_php_settings (whithout the ZRay part) is the following:

#!/bin/bash -x
set -e

PHP_ERROR_REPORTING=${PHP_ERROR_REPORTING:-"E_ALL & ~E_DEPRECATED & ~E_NOTICE"}
sed -ri 's/^display_errors\s*=\s*Off/display_errors = On/g' /etc/php5/apache2/php.ini
sed -ri 's/^display_errors\s*=\s*Off/display_errors = On/g' /etc/php5/cli/php.ini
sed -ri "s/^error_reporting\s*=.*$//g" /etc/php5/apache2/php.ini
sed -ri "s/^error_reporting\s*=.*$//g" /etc/php5/cli/php.ini
echo "error_reporting = $PHP_ERROR_REPORTING" >> /etc/php5/apache2/php.ini
echo "error_reporting = $PHP_ERROR_REPORTING" >> /etc/php5/cli/php.ini

mkdir -p /data/tmp/php/uploads
mkdir -p /data/tmp/php/sessions
mkdir -p /data/tmp/php/xdebug
chown -R www-data:www-data /data/tmp/php*

ln -sf /etc/php5/mods-available/zz-php.ini /etc/php5/apache2/conf.d/zz-php.ini
ln -sf /etc/php5/mods-available/zz-php-directories.ini /etc/php5/apache2/conf.d/zz-php-directories.ini
ln -sf /usr/share/php/libzend-framework-php/Zend/ /usr/share/php/Zend
a2enmod rewrite
php5enmod mcrypt

# Apache gets grumpy about PID pre-existing files
: "${APACHE_PID_FILE:=${APACHE_RUN_DIR:=/var/run/apache2}/apache2.pid}"
rm -f "$APACHE_PID_FILE"

source /etc/apache2/envvars && exec /usr/sbin/apache2 -DFOREGROUND "$@"

The question is, how do I execute such new script during image build? Using CMD? Any other workaround?

Yaron Idan · Accepted Answer · 2016-10-25 12:20:36Z

5

The correct directive for this is RUN. This would run the script on image build. in your case -

RUN /usr/local/bin/setup_php_settings
CMD bash

answered Oct 25, 2016 at 12:20

Yaron Idan

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4 Comments

ReynierPM Over a year ago

Not so fast, I have added the content of the setup_php_settings file and maybe you want to re-check your answer :) I would say based on your answer that will be better to have a separated RUN command for the installation stuff, what do you think?

Yaron Idan Over a year ago

All of the steps in your script, except for maybe the last line should be run during image build (i.e a separate RUN command). The last one looks more like something I would put inside a CMD command in my dockerfile, Although I would substitute the source part with ENV commands in the dockerfile (assuming this file only sets env vars)

ReynierPM Over a year ago

Ok, can you add an example of your possible setup? Sorry I am still learning Docker :)

Yaron Idan Over a year ago

This is kinda of a different question than "how to run a script on image creation". The short answer would be - run 2 containers, one for apache (you can use their official image - hub.docker.com/_/httpd) and one for your php app, and link them together using the --link flag. it's a bit advanced but if you want to dive into docker I recommend starting building your apps ready for container work right from the start.

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