README

docker-compose is a very useful tool, especially if you're programming inside a network of docker-containers. Accessing the (TCP) services of these docker containers, however is not so easy. To the best of my knowledge there are currently no tools available, that will add the IPs and hostnames of your running network to your hosts /etc/hosts file- until now.

Why not use <insert DNS/discovery service here>?

Running a DNS service for docker containers always messes with the DNS settings of your workstation. Especially if these DNS/discovery services themselves run inside docker containers on an active development workstation. Resolving DNS issues is not an easy task. Contrary to that the /etc/hosts file is simple. It couldn't care less if your workstation switches domains, DNS services, VPNs, etc. on-the-fly. In case something goes wrong, you can always edit the file manually. It was made for adding the hosts of a docker network (joke). I like the /etc/hosts file (not a joke).

Add to your PHP project

composer require kba-team/dockertools --dev

Add entries to hosts

In a bridged docker network, remove and add the IP addresses and hostnames of containers created by docker-compose in the /etc/hosts file. This will save you the hassle of port-forwarding, name resolvers, etc.

The script first removes all existing entries of all the hostnames of containers created by docker-compose in the /etc/hosts file and then adds them. This ensures, that there a no duplicate entries in the /etc/hosts file.

It is implied, that this script can only be called while docker containers are running.

Usage: docker_hosts.sh [-h] [-f <hosts-file>] [-r]

• -h Display usage information.
• -f <hosts-file> Use a different hosts file than /etc/hosts.
• -r Only remove all the hostnames of containers created by docker-compose, but do not add them.

Examples:

• vendor/bin/docker_hosts.sh: Remove and then add all docker containers in the /etc/hosts file.
• vendor/bin/docker_hosts.sh -r: Just remove all docker containers from the /etc/hosts file.

Environment variables

• DOCKER_REGISTRY Instead of using busybox:latest to manipulate the hosts file, ${DOCKER_REGISTRY}/busybox will be used. This is useful, in case you manually cache docker images in a local registry for faster access.

Automate docker-compose

In order to automate commands that need execution after docker-compose did its work, use bin/docker.sh.

Usage: vendor/bin/docker.sh <command>

Available commands are:

• add-hosts Add container hostnames and IPs to hosts file.
• remove-hosts Remove container hostnames and IPs from hosts file.
• exec Execute command(s) in docker container as ${DEFAULT_EXEC_USER:-www-data:www-data}. Available options:
  • -u | --user Run commands using user ID $(id -u) and group ID $(id -g).
  • -c | --container <name> Run commands in the specified container. Default container: ${DEFAULT_CONTAINER:-web}
• migrate Run the migrations command ${MIGRATE_COMMAND} inside the default container ${DEFAULT_CONTAINER:-web}.
• seed Run the seed command ${MIGRATE_COMMAND} inside the default container ${DEFAULT_CONTAINER:-web}.
• start Try to pull the current versions of the images, start the containers and add hostnames and IPs to the hosts file.
• up Run start, migrate and seed commands.
• stop Remove container hostnames and IPs from hosts file and stop the docker containers without destroying them.
• down Remove container hostnames and IPs from hosts file and destroy the docker containers.
• restart Run down and up commands.
• cleanup Delete files owned by ${DEFAULT_EXEC_USER}. Available options:
  • --root Delete files owned by root.
• behat Run behat tests. Any additional parameters will be added to the behat command.
• phpunit Run phpunit tests. Any additional parameters will be added to the phpunit command.
• help Show help.

Environment variables

Configure the environment variables in your .env file. That way it can be used by docker-compose as well (DRY).

• DEFAULT_EXEC_USER The default user executing commands inside docker containers.
• DEFAULT_CONTAINER The default container to execute commands in.
• MIGRATE_COMMAND The command running the migrations to set up the DB structure. In case this variable is not defined, nothing happens.
• SEED_COMMAND The command adding seed data to your empty DB. In case this variable is not defined, nothing happens.
• PHPUNIT_BIN The path to the PHPunit binary. In case this variable is not defined, nothing happens.
• BEHAT_BIN The path to the Behat binary. In case this variable is not defined, nothing happens.