go - 如何在一台机器上在consul中注册多个服务实例
问题描述
我有一个在开发机器上本地运行的领事。我还有一个 golang 服务在同一台机器上的两个不同端口上运行。有没有办法使用golang API将它们注册为一个服务但在consul中注册两个实例(例如,注册时是否可以指定节点名称)?
解决方案
这是一个非常基本的示例,它注册了名为my-service
. 每个实例都配置为侦听不同的端口,分别为 8080 和 8081。
需要注意的关键是服务实例也注册了一个唯一的服务 ID,以便消除在my-service
同一个代理上运行的实例 A 和实例 B 之间的歧义。
package main
import (
"fmt"
"github.com/hashicorp/consul/api"
)
func main() {
// Get a new client
client, err := api.NewClient(api.DefaultConfig())
if err != nil {
panic(err)
}
service_name := "my-service"
service_ports := [2]int{8080, 8081}
for idx, port := range service_ports {
svc_reg := &api.AgentServiceRegistration{
ID: fmt.Sprintf("%s-%d", service_name, idx),
Name: service_name,
Port: port,
}
client.Agent().ServiceRegister(svc_reg)
}
}
运行go mod init consul-register
(或任何模块名称)后,使用 执行代码go run main.go
,您可以看到该服务已在目录中注册。
$ consul catalog services
consul
my-service
通过 DNS 或 HTTP 为服务发现查询正确返回了两个服务实例。
$ dig @127.0.0.1 -p 8600 -t SRV my-service.service.consul +short
1 1 8080 b1000.local.node.dc1.consul.
1 1 8081 b1000.local.node.dc1.consul.
$ curl localhost:8500/v1/health/service/my-service
[
{
"Node": {
"ID": "11113853-a8e0-5787-7482-538078db855a",
"Node": "b1000.local",
"Address": "127.0.0.1",
"Datacenter": "dc1",
"TaggedAddresses": {
"lan": "127.0.0.1",
"lan_ipv4": "127.0.0.1",
"wan": "127.0.0.1",
"wan_ipv4": "127.0.0.1"
},
"Meta": {
"consul-network-segment": ""
},
"CreateIndex": 11,
"ModifyIndex": 13
},
"Service": {
"ID": "my-service-0",
"Service": "my-service",
"Tags": [],
"Address": "",
"Meta": null,
"Port": 8080,
"Weights": {
"Passing": 1,
"Warning": 1
},
"EnableTagOverride": false,
"Proxy": {
"Mode": "",
"MeshGateway": {},
"Expose": {},
"TransparentProxy": {}
},
"Connect": {},
"CreateIndex": 14,
"ModifyIndex": 14
},
"Checks": [
{
"Node": "b1000.local",
"CheckID": "serfHealth",
"Name": "Serf Health Status",
"Status": "passing",
"Notes": "",
"Output": "Agent alive and reachable",
"ServiceID": "",
"ServiceName": "",
"ServiceTags": [],
"Type": "",
"Definition": {},
"CreateIndex": 11,
"ModifyIndex": 11
}
]
},
{
"Node": {
"ID": "11113853-a8e0-5787-7482-538078db855a",
"Node": "b1000.local",
"Address": "127.0.0.1",
"Datacenter": "dc1",
"TaggedAddresses": {
"lan": "127.0.0.1",
"lan_ipv4": "127.0.0.1",
"wan": "127.0.0.1",
"wan_ipv4": "127.0.0.1"
},
"Meta": {
"consul-network-segment": ""
},
"CreateIndex": 11,
"ModifyIndex": 13
},
"Service": {
"ID": "my-service-1",
"Service": "my-service",
"Tags": [],
"Address": "",
"Meta": null,
"Port": 8081,
"Weights": {
"Passing": 1,
"Warning": 1
},
"EnableTagOverride": false,
"Proxy": {
"Mode": "",
"MeshGateway": {},
"Expose": {},
"TransparentProxy": {}
},
"Connect": {},
"CreateIndex": 15,
"ModifyIndex": 15
},
"Checks": [
{
"Node": "b1000.local",
"CheckID": "serfHealth",
"Name": "Serf Health Status",
"Status": "passing",
"Notes": "",
"Output": "Agent alive and reachable",
"ServiceID": "",
"ServiceName": "",
"ServiceTags": [],
"Type": "",
"Definition": {},
"CreateIndex": 11,
"ModifyIndex": 11
}
]
}
]
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