Docker Traefik启动报错：httpChallenge键已重复定义

报错原因 #

你的Traefik配置文件中重复定义了httpChallenge：在[certificatesResolvers.myResolver.acme]区块下，既写了httpChallenge = true的简写配置，又通过[certificatesResolvers.myResolver.acme.httpChallenge]块配置了entryPoint，TOML解析器会判定这是同一个键重复定义，导致容器启动失败。

修复步骤 #

1. 修改traefik.toml配置文件
   删除[certificatesResolvers.myResolver.acme]下的httpChallenge = true这一行，保留块配置即可。修改后的完整配置如下：

   [entryPoints]
     [entryPoints.web]
       address = ":80"
       [entryPoints.web.http]
         [entryPoints.web.http.redirections]
           [entryPoints.web.http.redirections.entryPoint]
             to = "websecure"
             scheme = "https"
   
     [entryPoints.websecure]
       address = ":443"
   
   [api]
   dashboard = true
   
   [providers.docker]
     endpoint = "unix:///var/run/docker.sock"
   
   [certificatesResolvers.myResolver.acme]
     email = "myMail@gmail.com"
     storage = "acme.json"
     [certificatesResolvers.myResolver.acme.httpChallenge]
       entryPoint = "web"
   

2. 重启Traefik容器
   执行命令重启容器：

   docker-compose down && docker-compose up -d
   

3. 验证启动状态
   查看容器日志确认是否正常启动：

   docker logs reverse-proxy
   

说明 #

Traefik v2.x中，配置ACME HTTP挑战时，若需要指定entryPoint等额外参数，仅需使用块配置[certificatesResolvers.xxx.acme.httpChallenge]即可，无需额外添加httpChallenge = true——后者是启用挑战的简写形式，与块配置同时存在会触发TOML的重复键错误。

内容的提问来源于stack exchange，提问作者Kenyuki