# Update php.ini when using a Docker image > A step-by-step guide on how to update your php.ini file inside a Docker container using a compose.yaml volume mount. Solve common issues like maximum file upload size. ---  **TL;DR** This article shows how to override `php.ini` settings (e.g. the max upload file size) in a Dockerized PHP site: create a local `php.ini` file, mount it over the container's config file via a `volumes` entry in `compose.yaml`, then `docker compose down && docker compose up --detach` to apply the change. This article aims to answer the following situation: *I'm using a Docker image to run my website and I should modify the php.ini file; how do I do this?* A real-world example is: you've followed my article [Create your Joomla website using Docker](/blog/docker-joomla) and everything is working fine. The website is running, and you wish to upload a big file to your site using the Joomla administration web interface. But, then, you get an error *The selected file cannot be transferred because it is larger than the maximum upload size allowed*.  One of the easiest ways to do is to create a `.ini` file on your disk and [share the file with your container](/blog/docker-volume). Most probably, you'll have a `compose.yaml` file, please edit the file. For the illustration, below you'll find a copy of the simplest `compose.yaml` file you can retrieve in my [Create your Joomla website using Docker](/blog/docker-joomla) blog post. *You can have yours of course*. This is just for example. **compose.yaml** ```yaml services: joomla: image: joomla restart: always ports: - 8080:80 environment: - JOOMLA_DB_HOST=joomladb - JOOMLA_DB_PASSWORD=example joomladb: image: mysql:8.0.13 restart: always environment: - MYSQL_ROOT_PASSWORD=example ``` ## Step one - Update your yaml file The solution is to add the `volumes` line if not yet present in your file and, the most important one, the line for *overriding* the `php.ini` file like below: **compose.yaml** ```yaml services: joomla: image: joomla restart: always ports: - 8080:80 environment: - JOOMLA_DB_HOST=joomladb - JOOMLA_DB_PASSWORD=example # highlight-next-line volumes: # highlight-next-line - ./php.ini:/usr/local/etc/php/php.ini joomladb: image: mysql:8.0.13 restart: always environment: - MYSQL_ROOT_PASSWORD=example ``` ## Step two - Create your own php.ini file The second thing to do is to create a file called `php.ini` in the same folder as your `compose.yaml` where you'll define your variables; f.i. **php.ini** ```ini file_uploads = On memory_limit = 500M upload_max_filesize = 500M post_max_size = 500M max_execution_time = 600 ``` So, now, your folder contains at least two files: ```bash $ pwd /tmp/joomla $ ls -alh Permissions Size User Group Date Modified Name drwxr-xr-x - christophe christophe 2023-11-04 09:32 . drwxrwxrwt - christophe christophe 2023-11-04 09:32 .. .rw-r--r-- 325 christophe christophe 2023-11-04 09:32 compose.yaml -rw-r--r-- 1 christophe christophe 2023-12-22 19:51 php.ini ``` ## Step three - Restart your container This done, just run `docker compose down ; docker compose up --detach` in your terminal to stop your current container(s) and restart it/them. Now, when restarting, Docker will take into account your latest changes and update accordingly the `php.ini` file that is present in Docker.