![]() To make it simpler, in this case, think of it as of TCP connections, but instead of connecting to IP and port you connect to a socket on the host. Unix socket is a special handler that allows applications to communicate. But there is an easy workaround for this problem Namespaces and containers It make the host socket inaccessible for the processes inside the container. The problem is the socket on the hosts is owned by the root, while the root PID from inside of your container is remapped to non-root PID on the host. It is required if you run Docker inside of the Docker container or you deploy a tool that will manage your Docker hosts or Docker Swarm cluster. In some cases you may need to access the host resource from the container like the Docker own socket. ![]() User namespaces provides the mechanism of remapping container resources to host resources limiting container access to the host system. The namespaces makes the process run on the host thinks that it has its own access to some global resources like the PIDs. One of the recommended change to improve Docker security is isolation of the containers in user namespace which was introduced in Docker Engine 1.10. Nothing is secure by default and Docker is no exception.
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