Build consul cluster, register DNS service

consul.sh

#!/bin/sh

# network
docker network create consulnet

# servers
docker run --network="consulnet" -p 8500:8500 --rm --name=consulServer1 consul agent --node=server1 --client=0.0.0.0 --bootstrap --server --ui
docker run --network="consulnet" --rm --name=consulServer2 consul agent --node=server2 --client=0.0.0.0 -join=172.18.0.2 --server
docker run --network="consulnet" --rm --name=consulServer3 consul agent --node=server3 --client=0.0.0.0 -join=172.18.0.2 --server

# agents
docker run --net="consulnet" --rm --name=consulClient1 consul agent --node=client1  --client=0.0.0.0 -join=172.18.0.2
docker run --net="consulnet" --rm --name=consulClient2 consul agent --node=client2  --client=0.0.0.0 -join=172.18.0.2
docker run --net="consulnet" --rm --name=consulClient3 consul agent --node=client3  --client=0.0.0.0 -join=172.18.0.2

# status
docker exec server1 consul members

# raft leader
docker exec server1 consul operator raft list-peers

# load dns service
service='{"service": {"name": "dns", "address": "8.8.8.8", "port": 53}}'
docker exec server1 sh -c "echo '$service' > /consul/config/dns.json"
docker exec server1 consul reload

# test dns service
sleep 1 # wait for reload
curl 127.0.0.4:8503/v1/catalog/service/dns?pretty