Docker uses macvlan

macvlan in Docker is a Linux kernel module that allows containers to have their own MAC address, enabling network isolation, performance improvement and direct interaction with the physical network. Using macvlan requires: 1. Install the kernel module; 2. Create a macvlan network; 3. Assign IP address segments; 4. Specify the macvlan network when container creation; 5. Verify the connection.

Docker uses macvlan

What is macvlan?

macvlan is a Linux kernel module that allows Docker containers to have their own MAC address and communicate directly with other devices on the host network. It is different from veth mode, which creates a pair of virtual Ethernet interfaces between the host and the container.

Why use macvlan?

macvlan offers the following advantages:

• Network Isolation: A container has its own MAC address, which isolates it from the host and other containers on the network.
• Performance Improvement: macvlan eliminates the additional overhead of virtual Ethernet interfaces, thereby improving network performance.
• Direct interaction with physical networks: Containers can communicate directly with devices on the physical network without routing through the host.

How to use macvlan

To use macvlan, you need to follow these steps:

1. Install the macvlan kernel module: If you haven't installed it yet, use the following command:

    <code>modprobe macvlan</code>

2. Create a macvlan network: Use the following command to create a macvlan network named "macvlan0":

    <code>ip link add macvlan0 link eth0 type macvlan mode bridge</code>

3. Assign IP address: Assign IP address segments to macvlan0 network, for example 192.168.1.0/24:

    <code>ip addr add 192.168.1.1/24 dev macvlan0</code>

4. Using macvlan network in Docker container: When creating a Docker container, use the --network=macvlan0 option to specify the macvlan network, for example:

    <code>docker run -it --rm --name my-container --network=macvlan0 centos</code>

5. Verify connection: In the container, use the ping command to verify connections to the host and other devices on the network.

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