consul · ThinkerQAQ

consul

1. What it is A component for service registration and discovery 2. Building a local cluster 2.1. Download 2.2. Configuration files 2.2.1. Create directories 2.2.2. Configuration files server1 server2 server3 2.3. Start 2.4. Test Add service configuration Add service web UI 3. References

Go1 min readhistorical

This is a historical learning note and may contain outdated or incomplete understanding.

1. What It Is

A component for service registration and discovery.

2. Building a Local Cluster

2.1. Download

Download Consul - Consul by HashiCorp

2.2. Configuration Files

2.2.1. Create Directories

mkdir -p conf/{node1,node2,node3}
mkdir -p data/{node1,node2,node3}

2.2.2. Configuration Files

server1

{
  "datacenter": "dc1",
  "data_dir": "C:\\software\\consul_1.7.2\\data\\node1",
  "log_level": "INFO",
  "server": true,
  "node_name": "node1",
  "ui": true,
  "bind_addr": "127.0.0.1",
  "client_addr": "127.0.0.1",
  "advertise_addr": "127.0.0.1",
  "bootstrap_expect": 3,
  "ports":{
    "http": 8500,
    "dns": 8600,
    "server": 8300,
    "serf_lan": 8301,
    "serf_wan": 8302
    }
}

server2

{
  "datacenter": "dc1",
  "data_dir": "C:\\software\\consul_1.7.2\\data\\node2",
  "log_level": "INFO",
  "server": true,
  "node_name": "node2",
  "bind_addr": "127.0.0.1",
  "client_addr": "127.0.0.1",
  "advertise_addr": "127.0.0.1",
  "bootstrap_expect": 3,
  "ports":{
    "http": 8510,
    "dns": 8610,
    "server": 8310,
    "serf_lan": 8311,
    "serf_wan": 8312
    }
}

server3

{
  "datacenter": "dc1",
  "data_dir": "C:\\software\\consul_1.7.2\\data\\node3",
  "log_level": "INFO",
  "server": true,
  "node_name": "node3",
  "bind_addr": "127.0.0.1",
  "client_addr": "127.0.0.1",
  "advertise_addr": "127.0.0.1",
  "bootstrap_expect": 3,
  "ports":{
    "http": 8520,
    "dns": 8620,
    "server": 8320,
    "serf_lan": 8321,
    "serf_wan": 8322
    }
}

2.3. Start

server1

consul agent  -config-dir C:\\software\\consul_1.7.2\conf\\node1

server2

consul agent  -config-dir C:\\software\\consul_1.7.2\conf\\node2 -retry-join=127.0.0.1:8301

server3

consul agent  -config-dir C:\\software\\consul_1.7.2\conf\\node3 -retry-join=127.0.0.1:8301

2.4. Test

Add a service configuration file

{
  "service": {
     "name": "web",
     "tags": ["master"],
     "address": "127.0.0.1",
     "port": 10000,
     "checks": [
       {
         "http": "http://localhost:10000/health",
         "interval": "10s"
       }
     ]
  }
}

Add a service

package main

import (
	"fmt"
	"net/http"
)

func handler(w http.ResponseWriter, r *http.Request) {
	fmt.Println("hello Web3! This is n3 or n2")
	fmt.Fprintf(w, "Hello Web3! This is n3 or n2")
}
func healthHandler(w http.ResponseWriter, r *http.Request) {
	fmt.Println("health check! n3 or n2")
}
func main() {
	http.HandleFunc("/", handler)
	http.HandleFunc("/health", healthHandler)
	http.ListenAndServe(":10000", nil)
}

web UI