Analysis of the Docker deployment Consul configuration process

Execute Command

docker run -d --name consul -p 8500:8500 consul

Port Description

https://www.consul.io/docs/install/ports.html

Mounting Instructions

/consul/data: persistent data storage
/consul/config: Configuration files

Consul Configuration

https://www.consul.io/docs/agent/options.html

Note: Open the browser at http://public network ip:8500

Cluster deployment

Start 4 Consul Agents, 3 Servers (a leader will be elected), and 1 Client

#Start the first Server node. The cluster requires 3 Servers. Map the container port 8500 to the host port 8900 and open the management interface.
docker run -d --name=consul1 -p 8900:8500 -e CONSUL_BIND_INTERFACE=eth0 consul agent --server=true --bootstrap-expect=3 --client=0.0.0.0 -ui

#Start the second Server node and join the cluster
docker run -d --name=consul2 -e CONSUL_BIND_INTERFACE=eth0 consul agent --server=true --client=0.0.0.0 --join 172.17.0.2

#Start the third Server node and join the cluster
docker run -d --name=consul3 -e CONSUL_BIND_INTERFACE=eth0 consul agent --server=true --client=0.0.0.0 --join 172.17.0.2

#Start the fourth Client node and join the cluster
docker run -d --name=consul4 -e CONSUL_BIND_INTERFACE=eth0 consul agent --server=false --client=0.0.0.0 --join 172.17.0.2

The IP address of the first container started is usually 172.17.0.2, and the IP addresses of the containers started later will be: 172.17.0.3, 172.17.0.4, and 172.17.0.5.

These Consul nodes are interoperable in Docker containers, and they communicate through bridge mode. However, if the host wants to access the network inside the container, port mapping is required. When starting the first container, map Consul's port 8500 to the host's port 8900 so that you can easily view cluster information through the host's browser.

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