1. How to Run Multiple Projects by Docker

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The project's Python Interpreter is set to use Docker Compose. If I point it at a docker-compose service that binds no ports, I cannot connect to the Django server from my web browser. If I add a `ports` section to that docker-compose service, the first thing I start grabs that port, and when I attempt to run other things they fail with ```. I have also tried not adding the -p tag, it will run when I use this but when i execute docker ps it will show 3306/tcp and NOT 0.0.0.0:3306-3306/tcp as the PORT. I have also tried just having to port tag as -p 3306 but this will show 0.0.0.0:32769-3306/tcp as the PORT in docker ps. I would love some help. Thanks in advance. If this happens it's likely you have something else running on port 8080 or you started the server on a different port but forgot to set the FNAPIURL. Configure your Context. Before we start using Fn, we need to configure Fn to point to an appropriate Docker registry so it knows where to push your function images to.

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 documentprovides 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 withoutmodifying 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 docker-compose.

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 composein 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¶

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This solution is more viable for someone who really needs to have projects ready to run in a few seconds and often end up havingtwo 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 asshopsys-framework-php-fpm would now be named my-project-name-php-fpm.

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 ofdocker 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 lsof).

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.

Warning

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 port of webserver container which affects the domain URL, so you need to change ports in domains_urls.yaml.
• You changed container_name of 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-fpm you need to execute

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:

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 docker-compose.That is done by executing:

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 docker-compose down.

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¶

When 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 docker/php-fpm/Dockerfile or docker-compose.yml.

Note

Since v7.0.0-beta4 we have set the Composer memory limit to -1 (which means unlimited) in the php-fpm's Dockerfile.
If you still encounter memory issues while using Docker for Windows (or Mac), try increasing the limits in Docker -> Preferences… -> Advanced.

Note

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.:

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.

Libnetwork Feature Parity Testing/Tutorial with Existing Docker Networking

The following parameters are global options that are set via $DOCKER_OPTS variable typically in the file /etc/default/docker. Once you start the Docker daemon, if you want to modify any of those parameters it requires a restart of the daemon:

There are two networking options that can be supplied either at startup or when docker run is executed. If set in the Docker configuration /etc/default/docker it is now a global option rather then a per-container configuration.

Lastly the following are per-container configurations only when docker run is invoked.

General Configuration of the Daemon

Note: If your Docker Host OS is using SysV init rather then Systemd replace the systemctl commands with service. More on that holy war here

Add a custom docker network bridge (--bridge=)

At this point you don't have the docker0 default bridge anymore

Next setup a custom network bridge:

Notice now when you look at the docker proc. It references the bridge OPT modification:

Next lets start a host:

Lets run a container now.As pointed out earlier, the default bridge to use is specified in the configuration file that the docker daemon reads DOCKER_OPTS from, not passed from the docker run command.

For example, run docker run -it --rm ubuntu echo hello worlds will execute echo hello worlds in the new container and exit deleting the container in the process. Note, the --rm parameter which means the container will be removed after the process it is asked to run completes. In this case it was the echo command (echo hello worlds).

You can pass a name with the docker run like so:

Next start a service and expose a port mapping (PAT):

In another window on the host get the IP address of the container:

Hit the new nginx service you just started. Keep in mind unless the bridge subnet is routed/flooded/forwarded/etc in some fashion it will only be reachable via the local docker host.

Now notice the differences in the containers metadata with a port exposed:

Errors restarting the daemon

If when you restart your machine and the bridge you created was not reinitialized in the Linux init configs, you need to recreate the bridges or put them in your OS network conf. E.g. for example /etc/network/interfaces or /etc/sysconfig/network-scripts/ifcfg-<name>

FEEDBACK: Should this be initialized by default in future releases? That said, I like that the daemon aborts rather then start broken containers.

The error will look like so:

To resolve that issue, redefine the bridge specified in the /etc/default/docker

Specifying a specific an external address mapping (--ip=)

Add a sub-interface to the iface w/ the desired network you want a secondary on. TODO: get the syntax/instructions for iproute2

Now test the service:

Specifying a specific an DNS address mapping (--ip= and --dns-search=)

These can be added to the docker run command also. This is handy if the change is not desired globally be default.

If you want to change the search domain, simply pop that into the DOCKER_OPTS ENV like so (bridge section isn't required, just showing compatabilities):

Specify a containers mac-address at runtime (--mac-address=)

Specify the mac address with the ``docker runcommand using the --mac-address=`. That can be used without changing anything in `/etc/default/docker`.

Verify the mac in the container

Specify a block of IP addresses to be used (--fixed-cidr)

If you want to block out a range of addresses that are a subset of the allocated bock you can do so with the following in /etc/default/docker:

DOCKER_OPTS='--fixed-cidr=192.168.5.128/28 -b=bridge0 '

Notice the fixed ipv4 prefix falls within the subnet assigned to the bridge:

Full output:

Failed Port Is Already Allocated Issue 1114 Docker For Mac Github Download

Specify a Custom MTU

To specify a custom global MTU for all docker containers on the host modify DOCKER_OPTS

DOCKER_OPTS='--mtu=8192'

This will modify both the docker0 bridge and the veth pair

Here are the docker host links:

The other side of the veth pair that is renamed to eth0 (by default) with the custom MTU

IPv6 with a Custom Bridge (--ipv6=true -b=bridge0)

By default if you specify v6 support Docker provisions what is commonly referred to as a 'dual stack' meaning the host has both an IPv4 address and an IPv6 address.

The DOCKER_OPTS config for this example is as follows:

DOCKER_OPTS='-b=bridge0 --mtu=8192 --ipv6=true'

The Docker host side of the veth pair looks like this:

The docker container side of the pair is:

Default docker0 (--ipv6=true) support

Note: when you are switching between a custom bridge and the default docker0 profiles, you currently need to destroy containers using the previous configuration. The daemon will refuse to start if it detects a collision like this in the configuration at runtime. This is actually a positive choice in the docker logic because the alternative would be to spin up a container that appears to be functioning but in reality is in a broken state.

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Disney scene it 3rd edition. The DOCKER_OPTS config for this example is as follows:

DOCKER_OPTS='--ipv6=true'

The docker container side of the veth pair

Lastly for testing v6 connectivity simply use the ping6 utility that is installed by default in most of the popular Linux images in the Docker Library.

Set a custom hostname with Docker Run

Simply pass the --hostname=FOO option when you create a container:

This will update your /etc/hosts config file also:

Systemd Config with Docker

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Locate the systemd docker.service unit file on the Docker host. On Ubuntu or Debian it is located at: /lib/systemd/system/docker.service

ExecStart is the main one you will probably edit. As long as $DOCKER_OPTS is in there as a value the /etc/default/docker file will get read at initialization and added to the process exec. You can add it directly here is you so desire.

Note, on Ubuntu Vivid 15.04 I still need to manually kill -9 the docker process because Systemd just sits there in a state like so:

It will finally time out and get killed with sig but hey its systemd ><

The above Systemd unit file coupled with the following '/etc/default/docker'

Result in a running process of this:

and a systemd status docker of this:

Onan pro 5000e generator manual. Note I have to DOCKER_OPTS parameters added along with the default configuration DOCKER_OPTS='-b=bridge0 -H tcp://0.0.0.0:2375'.

-b=bridge0 instructs docker to use bridge0 rather then the default docker0 bridge.

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-H tcp://0.0.0.0:2375 binds the remote API to port 2375 on all IP addresses for remote docker cli execution of the docker host.