I use Docker Compose to configure some Dockerised batch jobs. These jobs pull some data from external databases and then save data back to other databases. The jobs never interact directly with each other. They do not expose any ports or run any servers.
I would like to switch off Docker networking.
By default, docker-compose creates a network for each configuration. Is there a way to supress this so that compose starts running the container without bothering to create any network?
2
Answers
You can tell docker-compose to use the host network for the containers. You define it for each container like this
Of course that means that any ports that the container uses need to be available on the host, since you can’t do any port mapping.
Normally, the networks created are a nice thing and something you want to do. You may not realise it, but running a single container with
docker run
also creates a network, unless you use host network mode.If you bothering the sole create/destroy process of the network you can create a network once and use it every time you spin the compose.
In addition there is a docker built-in network called None, which disables networks completely for a container joining that. Maybe you already have seen it with
docker network ls
along withhost
If all services using a
network_mode
host or none, compose will suppress the creation of the default network..Edit: One (including me) might have the idea to implement it like that to get rid of the
network_mode
setting for each service:But then compose thinks it is actually a network and tries to set the network aliases which leads to an error:
network-scoped alias is supported only for containers in user defined networks
. Same applies if you try to add the other pre-configured networks like that.