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This article will explain in detail how to use flannel in Docker. The quality of the article is high, so Xiaobian shares it with you as a reference. I hope you have a certain understanding of relevant knowledge after reading this article.

Use flannel in Docker.

Configuring Docker Connection Flannel

Edit the Docker configuration file/etc/systemd/system/docker.service for host1 to set--bip and--mtu.

The values of these two parameters must match FLANNEL_SUBNET and FLANNEL_MTU in/run/flannel/subnet.env.

Restart Docker daemon.

systemctl daemon-reload

systemctl restart docker.service

Docker configures 10.2.40.1 to Linux bridge docker0 and adds a route to 10.2.40.0/24

Host2 is configured similarly:

--bip=10.2.17.1/24

--mtu=1450

The current environment network topology is visible: Flannel does not create a new docker network, but uses the default bridge network directly. Containers on the same host are connected via docker0, and cross-host traffic is forwarded via flannel.1.

Connect containers to the flannel network

Run container bbox1 in host1:

docker run -itd --name bbox1 busybox

Run container bbox2 in host2:

docker run -itd --name bbox2 busybox

The IP addresses for bbox1 and bbox2 are 10.2.40.2 and 10.2.17.2, respectively.

About how to use flannel in Docker to share here, I hope the above content can be of some help to everyone, you can learn more knowledge. If you think the article is good, you can share it so that more people can see it.

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