Docker overlay realizes container intercommunication across hosts

Docker overlay realizes container intercommunication across hosts

Environmental Description

IP Registration Center
192.168.20.5 Consule
192.168.20.6
192.168.20.7

1. Docker configuration

All physical machines need to be configured. Just change the corresponding network card name eno3 and consul address

sudo vim /lib/systemd/system/docker.service
#ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2376 -H unix:///var/run/docker.sock --cluster-store=consul://192.168.20.5:8500 --cluster-advertise=eno3:2376 --insecure-registry=0.0.0.0/0

Note that this configuration file has a higher priority /etc/systemd/system/docker.service

Check startup

sudo systemctl daemon-reload 
sudo systemctl restart docker.service 
ps -ef | grep dockerd

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2. Create a registry and network

Create a network segment and network name on consul

docker run -d -p 8400:8400 -p 8500:8500 -p 8600:53/udp -h consul progrium/consul-server -bootstrap -ui-dir /ui
# Create a subnet, and the network will be automatically synchronized to other machines docker network create -d overlay --subnet=192.168.21.0/24 overlay-net

Check

docker ps
docker network ls

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View the physical machines connected to the registry

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3. Start the container

Container names cannot be repeated

# On 192.168.20.5
docker run -d -it --name test1 --net=overlay-net centos bash
# On 192.168.20.6
docker run -d -it --name test2 --net=overlay-net centos bash
# On 192.168.20.7
docker run -d -it --name test3 --net=overlay-net centos bash

It can be seen that they can ping each other

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This is the end of this article about docker overlay to achieve cross-host container interoperability. For more relevant docker container interoperability content, please search 123WORDPRESS.COM's previous articles or continue to browse the following related articles. I hope everyone will support 123WORDPRESS.COM in the future!

You may also be interested in:
  • Cross-host communication between docker containers-overlay-based implementation method
  • Detailed explanation of Docker cross-host container communication overlay implementation process
  • Docker cleaning killer/Docker overlay file takes up too much disk space
  • Implementation of Docker cross-host network (overlay)
  • How to build a Docker overlay network

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