- How to Run Multiple Projects by Docker
- Update of Dockerfile is not Reflected
- Update of Docker-compose is not Reflected
- Docker-sync stopped to sync files
- Application is slow on Mac
- A docker container is not running
- Composer dependencies installation fails on memory limit
- Starting up the Docker containers fails due to invalid reference format
If you are developing on Shopsys Framework using docker, you might run into some problems during the process.
Most of the time you might think that a problem is in docker, but the truth is that you are probably using it wrong. This document provides advices that will help you develop Shopsys Framework on docker without problems.
How to Run Multiple Projects by Docker¶
If you are using docker for more than one Shopsys Framework project, you might run into a problem with container names and their ports.
Docker requires to have unique container name and port for each container and since our
docker-compose is not dynamically initialized,
it contains hard coded container names and ports and that makes running more projects in docker on same machine impossible without
modifying your configuration.
With that being said we got two options to solve this problem.
Multiple Projects - Quick Solution - Only One Project Running at the Time¶
This solution is simpler and is used if we only need one project running at the time.
All we really need to do is to properly turn off
Usually everyone shut off their
docker-compose by running
docker-compose stop, which is not correct way.
This command is used to stop containers, not to delete them. That means that if you now try to start docker compose in other project, it will output error that there already are containers with that names. That's true because these stopped containers are still registered in memory.
To properly delete your workspace containers, run:
This will not only stop the containers but it will also delete them. This means, that containers and all their data in volumes will be deleted. Now you can use same configuration in other project and it will work.
Multiple Projects - Long Term Solution¶
This solution is more viable for someone who really needs to have projects ready to run in a few seconds and often end up having two or more projects running at the same time. So what if we don't want to always reinstall whole containers and we want our data to persist in volumes?
Earlier we said that Docker needs to have unique container names and ports.
So how about changing their name?
We recommend to replace
shopsys-framework with your project name. For instance, php-fpm conainer that is defaultly named as
shopsys-framework-php-fpm would now be named
This would actually work only if you always downed
docker-compose before switching between projects.
Because it would try to locate our localhost ports to the same value and that would fail.
So we need to change the ports of the containers. Containers have their ports defined in this format
First one defines port exposed on our local computer, second one is for docker network. Since with every start of docker compose docker creates the new network and that isolates each project from each other, we do not need to care about second port. We actually just need to allocate the first port to free port on our local system.
Since we are trying to change ports on your local machine there is a chance that you will pick port that is already allocated for something else running on your computer.
You can check all of your taken ports using
netstat (for MacOs
This will output all listening TCP ports in numeric format. Now we can just pick one that isn't in this list and set it to our container.
Try not to use ports between 1000-1100, these are ports that root usually uses for its processes.
So now we got configured our
docker-compose files in a way they do not have any conflicts among them.
That way we can have as many projects running at the same time as many ports there are in our local network.
Remember that after changing these you need to do few things differently.
- You changed
portof webserver container which affects the domain URL, so you need to change ports in
- You changed
container_nameof php-fpm which means that in order to get inside the php-fpm container you must now use this name. for instance, if your new container name is
my-new-project-name-php-fpmyou need to execute
docker exec -it my-new-project-name-php-fpm bash
Update of Dockerfile is not Reflected¶
Sometimes there is need to change the dockerfile for one of our images. If we already had project running once in docker, there is probably cached image for the container.
That means that docker does not really check if there is change in the dockerfile,
it will always build container by cached image. So what we actually need is to rebuild our containers.
First we need to stop our containers in
docker-compose because we cannot update containers that are already in use:
Then we need to force Docker to rebuild our containers:
Docker has now updated our containers and we can continue as usual with:
docker-compose up -d
Update of Docker-compose is not Reflected¶
Docker compose is much easier to change than images. If we change anything in
docker-compose we just need to recreate
That is done by executing:
docker-compose up -d --force-recreate
Docker-sync stopped to sync files¶
Docker-sync suggests (in known issue) to use Docker for Mac in version 17.09.1-ce-mac42 (21090). This version helped most people to solve their issues with syncing.
You may sometimes encounter a sync problem even with the suggested version of Docker. In those cases, you need to recreate docker-sync containers. Here are two easy steps you have to follow:
Delete your docker-sync containers and volumes (data on your host will not be removed):
Start docker-sync so your docker-sync containers and volumes will be recreated:
Application is slow on Mac¶
We focus on enhancing the performance of the application on all platforms.
With Docker for Mac and Docker for Windows there are known some performance issues because of all project files need to be synchronized from host computer to application running in a virtual machine.
On Mac, we partially solved this by implementing docker-sync.
Docker-sync has some limits and that is the reason why we use Docker native volumes for syncing PostgreSQL and Elasticsearch data to ensure the data persistence.
In some cases, performance can be more important than the persistence of the data.
In this case, you can increase the performance by deleting these volumes in your
docker-compose.yml file but that will result in loss of persistence, which means that the data will be lost after the removal of the container, e.g. during
A docker container is not running¶
You can inspect what is wrong by using
docker logs <container-name> command.
Composer dependencies installation fails on memory limit¶
composer install or
composer update fails on an error with exceeding the allowed memory size, you can increase the memory limit by setting
COMPOSER_MEMORY_LIMIT environment variable in your
v7.0.0-beta4 we have set the Composer memory limit to
-1 (which means unlimited) in the php-fpm's
If you still encounter memory issues while using Docker for Windows (or Mac), try increasing the limits in
Docker -> Preferences… -> Advanced.
Composer dependencies contain 3-rd party software with licenses that are described in document Open Source License Acknowledgements and Third-Party Copyrights
Starting up the Docker containers fails due to invalid reference format¶
Docker images may fail to build during
docker-compose up -d due to invalid reference format, eg.:
Building php-fpm Step 1/41 : FROM php:7.2-fpm-stretch as base ERROR: Service 'php-fpm' failed to build: Error parsing reference: "php:7.2-fpm-stretch as base" is not a valid repository/tag: invalid reference format
This is because you have a version of Docker which does not support multi-stage builds.
Upgrade your Docker to version 17.05 or higher and try running the command again.