Docker uses host network

Docker's host network mode allows containers to use host network resources. Features include: Sharing IP addresses and ports with the host, accessing the host file system, network configuration, and firewall. Notes include: security issues, resource conflicts and restrictions. Best practices recommend using this pattern when a container needs deep integration with the host, access to a specific resource, or is trusted. Alternatives include bridge mode, overlay network, and custom network.

Docker uses host network

When a Docker container needs to access host network resources (such as other containers, local services, or the Internet), the host network mode can be used.

Enable host network mode

When creating or starting a container, the host network mode can be enabled with --network=host flag. For example:

 <code>docker run --network=host <image-name></image-name></code>

Advantages

Using host network mode has the following advantages:

• The container uses the same IP address and port as the host, simplifying network connections.
• The container can access file systems, sockets, and pipelines on the host.
• The container can use network configuration and firewall rules on the host.

Things to note

There are also some precautions when using the host network mode:

• Security issues: Containers share network stacks with hosts, and malicious containers may harm the hosts.
• Resource conflict: A container shares an IP address and port with the host, which may cause resource conflicts.
• Restrictions: Not all containers support host network mode.

Best Practices

For security and stability, it is recommended to use the host network mode in the following situations:

• The container needs to be deeply integrated with the host.
• The container needs to access specific resources or services on the host.
• The container is trusted and does not pose a security threat to the host.

Alternatives

In addition to the host network mode, there are other network modes available for Docker containers:

• Bridge mode: Create a virtual network isolated from the host.
• overlay network: Connect containers to a global, scalable virtual network.
• Custom network: Use user-defined network configuration.

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