traefik使用 -- consul catalog动态配置

consul下载地址： https://www.consul.io/downloads

traefik下载地址：https://github.com/traefik/traefik/releases

启动traefik的命令

traefik.exe --api.insecure=true  --configFile=traefik-sample.yml

配置文件 traefik-sample.yml

################################################################
#
# Configuration sample for Traefik v2.
#
# For Traefik v1: https://github.com/traefik/traefik/blob/v1.7/traefik.sample.toml
#
################################################################################################################################
# Global configuration
################################################################
global:checkNewVersion: truesendAnonymousUsage: true################################################################
# EntryPoints configuration
################################################################# EntryPoints definition
#
# Optional
#
entryPoints:web:address: :80websecure:address: :443################################################################
# Traefik logs configuration
################################################################# Traefik logs
# Enabled by default and log to stdout
#
# Optional
#
log:# Log level## Optional# Default: "ERROR"#level: DEBUG# Sets the filepath for the traefik log. If not specified, stdout will be used.# Intermediate directories are created if necessary.## Optional# Default: os.Stdout#
#  filePath: log/traefik.log# Format is either "json" or "common".## Optional# Default: "common"#
#  format: json################################################################
# Access logs configuration
################################################################# Enable access logs
# By default it will write to stdout and produce logs in the textual
# Common Log Format (CLF), extended with additional fields.
#
# Optional
#
#accessLog:# Sets the file path for the access log. If not specified, stdout will be used.# Intermediate directories are created if necessary.## Optional# Default: os.Stdout#
#  filePath: /path/to/log/log.txt# Format is either "json" or "common".## Optional# Default: "common"#
#  format: json################################################################
# API and dashboard configuration
################################################################# Enable API and dashboard
#
# Optional
#
api:# Enable the API in insecure mode## Optional# Default: false#insecure: true# Enabled Dashboard## Optional# Default: true#
#  dashboard: false################################################################
# Ping configuration
################################################################# Enable ping
#ping:# Name of the related entry point## Optional# Default: "traefik"#
#  entryPoint: traefik################################################################
# Docker configuration backend
################################################################providers:consulCatalog:refreshInterval: 30sdefaultRule: "PathPrefix(`/{{ .Name }}`)"endpoint:address: 127.0.0.1:8500scheme: http# Enable Docker configuration backend
#  docker:# Docker server endpoint. Can be a tcp or a unix socket endpoint.## Required# Default: "unix:///var/run/docker.sock"#
#    endpoint: tcp://10.10.10.10:2375# Default host rule.## Optional# Default: "Host(`{{ normalize .Name }}`)"#
#    defaultRule: Host(`{{ normalize .Name }}.docker.localhost`)# Expose containers by default in traefik## Optional# Default: true#
#    exposedByDefault: false

启动consul服务：

consul.exe agent -dev -ui

启动go 服务，并注册到consul：

package mainimport ("fmt""net/http"_ "net/http/pprof""time"consulapi "github.com/hashicorp/consul/api"
)var port  = 12000
var http_pre = "/consulServerNode"// consul 服务端会自己发送请求，来进行健康检查
func consulCheck(w http.ResponseWriter, r *http.Request) {s := "consulCheck" + fmt.Sprint(time.Now()) + " remote:" + r.RemoteAddr + " " + r.URL.String()_, _ = fmt.Fprintln(w, s)
}func HelloHandle(w http.ResponseWriter, r *http.Request)  {_, _ = fmt.Fprint(w, " hello! port = 12000")
}func registerServer() {config := consulapi.DefaultConfig()client, err := consulapi.NewClient(config)if err != nil {panic(err)}registration := &consulapi.AgentServiceRegistration{ID:                "consulServerNode_1",Name:              "consulServerNode",Tags:              []string{"traefik-test-tag"},Port:              port,Address:           "127.0.0.1",}registration.Check = &consulapi.AgentServiceCheck{ // 健康检查HTTP:                           fmt.Sprintf("http://%s:%d%s", registration.Address, port, http_pre +"/check"),Timeout:                        "3s",Interval:                       "5s",  // 健康检查间隔DeregisterCriticalServiceAfter: "30s", //check失败后30秒删除本服务，注销时间，相当于过期时间}if err := client.Agent().ServiceRegister(registration);err != nil {panic(err)}http.HandleFunc(http_pre +"/check", consulCheck)http.HandleFunc(http_pre +"/hello", HelloHandle)if err := http.ListenAndServe(fmt.Sprintf(":%d", port), nil); err!= nil{panic(err)}}func main() {registerServer()
}

启动traefik服务，启动命令见文章开始处

启动时会看到这样的日志（为看的比较清晰，将一些\" 替换成了“）

level=debug msg="Configuration received from provider consulcatalog: {"http":{"routers":{"consul":{"service":"consul","rule":"PathPrefix(`/consul`)"},"consulServerNode":{"service":"consulServerNode","rule":"PathPrefix(`/consulServerNode`)"}},"services":{"consul":{"loadBalancer":{"servers":[{"url":"http://127.0.0.1:8300"}],"passHostHeader":true}},"consulServerNode":{"loadBalancer":{"servers":[{"url":"http://127.0.0.1:12000"}],"passHostHeader":true}}}},"tcp":{},"udp":{}}" providerName=consulcatalog

浏览器访问 http://127.0.0.1/consulServerNode/hello

参考链接：

https://doc.traefik.io/traefik/providers/consul-catalog/

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