Interconnection between containers (2)

overlay cross-network interconnection

Trial planning

1. Configure the consul environment

   docker run -d -p 8500:8500 -h consul --name consul progrium/consul -server -bootstrap

   After the container starts, you can  access consul through http://192.168.195.131:8500 

2. Modify host1, host2 configuration

   ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2376 -H unix:///var/run/docker.sock --cluster-store=consul://192.168.195.131:8500 --cluster-advertise=ens33:2376

   Modify the docker.service files of host1 and host2 (the location of docker.service of different versions of docker may be different), and execute:

   systemctl daemon-reload
   systemctl restart docker.service

   Visit 192.168.195.131:8500/ui/#/dc1/kv/docker/nodes/ to view the two host information

3. Create overlay network

   docker network create -d overlay ovnet

   This command can be executed on either host1 or host2, the other one will be automatically synchronized

4. View overlay network

   docker network ls

   The scope of ovnet is global

   docker network inspect ov_net

   subnet：10.0.0.0/24；gateway：10.0.0.1

5. test interconnect

   docker run -t --network ovnet --name c1 centos 

   docker run -t --network ovnet --name c2 centos

   Run c1 on host1 and c2 on host2 (names cannot be the same)

   docker exec c1 ping -c 3 c2