can't update php.ini file in Docker container - php

Question

I'm trying to set Magento2 on Docker with Nginx & PHP7.
I've added a custom php.ini file as recommended by the PHP7 Docker image. I can see from phpinfo.php that it's loading my php.ini file but none of my updates are there.
It should be:
memory_limit = 2G
max_execution_time = 800
I've checked the PHP container and I can see the php.ini file is there with the correct settings, or so I think?
$ docker exec -it mymagento2docker_php_1 /bin/bash
# cat /usr/local/etc/php/php.ini
; This file is created automatically by the docker build
memory_limit = 2G
max_execution_time = 800
What am I doing wrong? Below are some more details.
Docker Project
.
├── docker-compose.yml
├── index.php
├── magento2
│   ├── [DIRECTORIES & FILES OMMITED]
│  
├── nginx
│   ├── Dockerfile
│   ├── default.conf
│   └── nginx.conf
├── output.txt
├── php
   ├── Dockerfile
    └── config
   └── php.ini
docker-compose.yml
nginx:
build: ./nginx/
ports:
- 80:80
links:
- php
volumes_from:
- app
php:
build: ./php/
expose:
- 9000
links:
- mysql
volumes_from:
- app
app:
image: php:7.0-fpm
volumes:
- ./magento2:/var/www/html
command: "true"
mysql:
image: mysql:latest
volumes_from:
- data
ports:
- "3306:3306"
environment:
MYSQL_ROOT_PASSWORD: mage2
MYSQL_DATABASE: mage2
MYSQL_USER: mage2
MYSQL_PASSWORD: mage2
data:
image: mysql:latest
volumes:
- /var/lib/mysql
command: "true"
phpmyadmin:
image: phpmyadmin/phpmyadmin
ports:
- 8080:80
links:
- mysql
environment:
PMA_HOST: mysql
php/Dockerfile
FROM php:7.0-fpm
# Install dependencies
RUN apt-get update \
&& apt-get install -y \
cron \
libfreetype6-dev \
libicu-dev \
libjpeg62-turbo-dev \
libmcrypt-dev \
libpng12-dev \
libxslt1-dev
# Configure the gd library
RUN docker-php-ext-configure \
gd --with-freetype-dir=/usr/include/ --with-jpeg-dir=/usr/include/
# Install required PHP extensions
RUN docker-php-ext-install \
gd \
intl \
mbstring \
mcrypt \
pdo_mysql \
xsl \
zip \
soap
# Install the 2.4 version of xdebug that's compatible with php7
RUN pecl install -o -f xdebug-2.4.0
COPY config/php.ini /usr/local/etc/php/
## php/config/php.ini ##
; This file is created automatically by the docker build
memory_limit = 2G
max_execution_time = 800
UPDATE
I've tried restarting nginx with the below, but it did not work.
$ docker exec -it mymagento2docker_php_1 /bin/bash
# /etc/init.d/nginx restart
bash: /etc/init.d/nginx: No such file or directory
# service nginx restart
nginx: unrecognized service
# nginx -s reload
bash: nginx: command not found
# exit
$ docker restart mymagento2docker_nginx_1
mymagento2docker_nginx_1
$ docker exec -it mymagento2docker_nginx_1 /bin/bash
# /etc/init.d/nginx restart
Restarting nginx: nginxross in ~/my-magento2-docker
$ docker-compose ps
Name Command State Ports
---------------------------------------------------------------------------------------------
mymagento2docker_app_1 true Exit 0
mymagento2docker_data_1 docker-entrypoint.sh true Exit 0
mymagento2docker_mysql_1 docker-entrypoint.sh mysqld Up 0.0.0.0:3306->3306/tcp
mymagento2docker_nginx_1 nginx -g daemon off; Exit 0
mymagento2docker_php_1 php-fpm Up 9000/tcp
mymagento2docker_phpmyadmin_1 /run.sh phpmyadmin Up 0.0.0.0:8080->80/tcp
ross in ~/my-magento2-docker
$ docker-compose up -d
Starting mymagento2docker_app_1
Starting mymagento2docker_data_1
mymagento2docker_mysql_1 is up-to-date
mymagento2docker_phpmyadmin_1 is up-to-date
mymagento2docker_php_1 is up-to-date
Starting mymagento2docker_nginx_1
ross in ~/my-magento2-docker
$ docker exec -it mymagento2docker_nginx_1 /bin/bash
# service nginx restart
Restarting nginx: nginxross in ~/my-magento2-docker
$ docker-compose up -d
Starting mymagento2docker_app_1
Starting mymagento2docker_data_1
mymagento2docker_mysql_1 is up-to-date
mymagento2docker_phpmyadmin_1 is up-to-date
mymagento2docker_php_1 is up-to-date
Starting mymagento2docker_nginx_1
ross in ~/my-magento2-docker
$ docker exec -it mymagento2docker_nginx_1 /bin/bash
# nginx -s reload
2016/10/05 14:07:43 [notice] 12#12: signal process started
#

Answer 1

Add a volumes: section to your php service in the docker-compose.yml file, map a local directory with a custom.ini file to /usr/local/etc/php/conf.d, and restart your container. Whatever valid settings in that file will override those from the main php.ini file. (Incidentally you can do the same with MySQL but not with Nginx).
This works in my own project:
php:
volumes:
- ./localpath/custom.ini:/usr/local/etc/php/conf.d/custom.ini

Answer 2

i think you have to reload the nginx config.
i dont know which OS your php container uses, but try inside of the container some of these:
# /etc/init.d/nginx restart
# service nginx restart
# nginx -s reload
my logical reason is, that you install php ( and start it at the same time ) and after all you copy the new config.

Answer 3

This is what happened :
- If you map the php.ini from host to container, make sure that file (php.ini) must exist on host before you launch the container. Otherwise, the container will not start
- Please check if docker was able to read your php.ini file (check permission, sometime docker is running as different user and can't access host file which belongs to root)
- Every time you update php.ini, you must restart php-fpm (get inside the container and restart the php-fpm to test, do not rebuild container) , and clear cache (if you enable opcache)