Common drop-ins and utilities for SystemDocker units.
To install SystemDocker Common, perform the following commands:
mkdir -p /srv/docker
git clone --recursive https://github.com/SystemDocker/common.git /srv/docker/common
/srv/docker/common/install.sh
All drop-ins are stored in the dropins/ folder. Where the filename ends .conf these drop-ins are designed to be symbolically linked to from the drop-in directory of your service (see Using drop-ins); where they end .conf.tpl these drop-ins are designed to be used as a template and should be copied into the drop-in directory of your service and edited there (see Using drop-in templates).
TODO: More detail about using drop-ins
TODO: More detail about using drop-in templates
To control core docker functionality, such as the creation of networks, docker units have been provided which represent these objects. Units should be installed by symbolically linking them in the /etc/systemd/system directory.
The docker-network@.service unit creates a docker network with the name matching the instance name. The dropins/docker-network.conf.j2 dropin template can be used with services which should use the network.
To customise each network, dropins can be used to specify environment variables. See dockenv for details on the environment variable which can be set through dropins to control the creation of the network.