以编程方式启动的 Consul 代理未打开 HTTP 端口答案

【问题标题】：Consul agent started programmatically does not open HTTP port以编程方式启动的 Consul 代理未打开 HTTP 端口
【发布时间】：2016-08-16 09:19:17
【问题描述】：

我尝试使用他们的 Golang package 启动 Consul 代理。服务器本身启动，但我无法与之交互，因为它没有开始侦听传入的 HTTP 请求。

我启动代理的代码：

//create the logwriter
writer := bytes.NewBuffer(server.log)

agentConfig := agent.DefaultConfig()
agentConfig.BindAddr = "127.0.0.1"
agentConfig.DevMode = true
agentConfig.Bootstrap = true
agentConfig.Server = true
agentConfig.DataDir = "/tmp"
agentConfig.Ports.HTTP = 8500
agentConfig.Ports.HTTPS = -1
//agentConfig.AdvertiseAddr = "127.0.0.1"
//agentConfig.EnableUi = true
agentConfig.Addresses.HTTP = "127.0.0.1"

glog.Infof("Agent config: %+v", agentConfig)

agent, err := agent.Create(agentConfig, writer)
if err != nil {
    t.Fatalf("Error starting consul agent: %v", err)
}

启动时生成的配置如下所示：

Agent config: &{DevMode:true Bootstrap:true BootstrapExpect:0
Server:true Datacenter:dc1 DataDir:/tmp DNSRecursor: DNSRecursors:[]  DNSConfig:{NodeTTL:0 NodeTTLRaw: ServiceTTL:map[] ServiceTTLRaw:map[] 
AllowStale:false EnableTruncate:false UDPAnswerLimit:3 MaxStale:5s 
MaxStaleRaw: OnlyPassing:false} Domain:consul. EncryptKey: 
LogLevel:INFO NodeName: ClientAddr:127.0.0.1 BindAddr:127.0.0.1 
AdvertiseAddr: AdvertiseAddrs:{SerfLan:<nil> SerfLanRaw: SerfWan:<nil> 
SerfWanRaw: RPC:<nil> RPCRaw:} AdvertiseAddrWan: 
TranslateWanAddrs:false Ports:{DNS:8600 HTTP:8500 HTTPS:-1 RPC:8400 
SerfLan:8301 SerfWan:8302 Server:8300} Addresses:{DNS: HTTP:127.0.0.1 
HTTPS: RPC:} TaggedAddresses:map[] LeaveOnTerm:false SkipLeaveOnInt:
<nil> Telemetry:{StatsiteAddr: StatsdAddr: StatsitePrefix:consul 
DisableHostname:false DogStatsdAddr: DogStatsdTags:[]} Protocol:2 
EnableDebug:false VerifyIncoming:false VerifyOutgoing:false VerifyServerHostname:false CAFile: CertFile: KeyFile: ServerName: 
StartJoin:[] StartJoinWan:[] RetryJoin:[] RetryMaxAttempts:0 
RetryInterval:30s RetryIntervalRaw: RetryJoinWan:[] 
RetryMaxAttemptsWan:0 RetryIntervalWan:30s RetryIntervalWanRaw: 
ReconnectTimeoutLan:0 ReconnectTimeoutLanRaw: ReconnectTimeoutWan:0 
ReconnectTimeoutWanRaw: EnableUi:false UiDir: PidFile: 
EnableSyslog:false SyslogFacility:LOCAL0 RejoinAfterLeave:false 
CheckUpdateInterval:5m0s CheckUpdateIntervalRaw: ACLToken: 
ACLMasterToken: ACLDatacenter: ACLTTL:30s ACLTTLRaw: 
ACLDefaultPolicy:allow ACLDownPolicy:extend-cache Watches:[] 
DisableRemoteExec:false DisableUpdateCheck:false 
DisableAnonymousSignature:false HTTPAPIResponseHeaders:map[] 
AtlasInfrastructure: AtlasToken: AtlasACLToken: AtlasJoin:false 
AtlasEndpoint: AEInterval:1m0s DisableCoordinates:false 
SyncCoordinateRateTarget:64 SyncCoordinateIntervalMin:15s Checks:[] 
Services:[] ConsulConfig:<nil> Revision: Version: VersionPrerelease: 
WatchPlans:[] UnixSockets:{UnixSocketPermissions:{Usr: Grp: Perms:}} 
SessionTTLMin:0 SessionTTLMinRaw: Reap:<nil>}

检查我的开放端口，我可以看到代理已启动但未侦听 HTTP

storage.t 16820  felix    5u  IPv4 469866      0t0  TCP localhost:8300 (LISTEN)
storage.t 16820  felix    6u  IPv4 469867      0t0  TCP localhost:8301 (LISTEN)
storage.t 16820  felix    7u  IPv4 469868      0t0  UDP localhost:8301
storage.t 16820  felix    8u  IPv4 469869      0t0  TCP localhost:8302 (LISTEN)
storage.t 16820  felix    9u  IPv4 469870      0t0  UDP localhost:8302

感谢您提供的每个提示：)

【问题讨论】：

你试过在 0.0.0.0 上收听吗？
您无法在0.0.0.0 上收听。这导致：Failed to get advertise address: Multiple private IPs found. Please configure one.

标签： go consul

【解决方案1】：

确保所有必需的端口也都打开：

服务器 RPC（默认 8300）
Serf LAN（默认 8301）
Serf WAN（默认 8302）
HTTP API（默认 8500）
DNS 接口（默认 8600）

来自领事文档： https://www.consul.io/docs/agent/options.html#ports-used

【讨论】：