What is the 'host' network type in Docker?

The 'host' network type in Docker allows the container to use the network stack of the host machine.

Key features:

• Performance: High, as there is no network isolation and no overhead for NAT or bridges.
• Access: The container is directly accessible via the host's IP address and open ports.
• Security: Low, as the container has full access to the host's network interface. Port conflicts with processes on the host are possible.
• Use cases: Suitable when network stack isolation is not required, or for high-performance applications, or when direct use of host network capabilities is needed.
• Limitations: Cannot use multiple containers listening on the same port on the host. Less portable compared to bridge network.

Example of running a container with 'host' network type:

# Run Nginx accessible on port 80 of the host
docker run -d --network host nginx