Hi Team, With

Docker version 28.0

, when we run a Zookeeper container, the Zookeeper container port 2181 is not reachable from other hosts. It was working until

Docker version 27.5.1

.

docker run -d \
  --name zookeeper \
  -p 2181:2181 \
  zookeeper:latest

It has been due to

Docker version 28.0

add below iptable rule

# iptables -L -t nat -v -n |grep 2181
# Warning: iptables-legacy tables present, use iptables-legacy to see them
   30  1748 DNAT       tcp  --  !docker0 *       0.0.0.0/0            0.0.0.0/0            tcp dpt:2181 to:10.1.215.5:2181

Docker doc https://docs.docker.com/engine/release-notes/28/#networking mentioned, if we add

DOCKER_INSECURE_NO_IPTABLES_RAW=1

env variable then it will skip adding RAW table rules. but its not working.

[Service]
Environment="DOCKER_INSECURE_NO_IPTABLES_RAW=1"

any help/idea please.

wrong chat?

https://github.com/flannel-io/flannel Flannel support has mentioned this channel

I think the "Contact" section is confusing, since it comes after both the "Getting started with Kubernetes" and the "Getting Started with Docker" sections. The

#k3s

channel is mentioned because k3s is recommended in the "Getting started with Kubernetes" section. I think you are in the "Getting Started with Docker" section, where Kubernetes (of which K3s is a distribution) is not relevant. You are not necessarily going to know that. As I say, I think that "Contact" section in confusing. Good luck with getting support from one of the other contact suggestions 🙂