Is it possible to share memory between docker containers?
docker, linux-containers
Solution
The `--ipc=host` and `--ipc=container:id` options have since been added to the Docker `create` and `run` commands to share IPC resources.
--ipc="" : Set the IPC mode for the container,
'container:<name|id>': reuses another container's IPC namespace
'host': use the host's IPC namespace inside the container
IPC with the host
docker run --ipc=host <image>
IPC with another container
docker run --ipc=container:<id> <image>
IPC with another container may need the `shareable` option set on the initial container (if dockerd defaults IPC to `private`)
docker run --ipc=shareable <image>
Problem
I work on an application with different processes and I'm asked to contain those processes for achieving more isolation. The problem is that the processes share memory with a single "hypervisor" process in order to exchange data (they use classic shared buffers). This solution was implemented for performance requirement and because it is running in user-space, so there aren't content switching between user-space and kernel-space. If I'm not wrong is not possible to run more than one docker container inside a single IPC namespace, but I don't know if it is possible that a single docker container belongs to different IPC namespaces, this could solve my problem. Other solutions are welcome, just keep in mind that performance is a requirement, thanks in advance.