| `traefik.backend=foo` | Give the name `foo` to the generated backend for this container. |
| `traefik.backend.maxconn.amount=10` | Set a maximum number of connections to the backend. Must be used in conjunction with the below label to take effect. |
| `traefik.backend.maxconn.extractorfunc=client.ip` | Set the function to be used against the request to determine what to limit maximum connections to the backend by. Must be used in conjunction with the above label to take effect. |
| `traefik.backend.loadbalancer.swarm=true` | Use Swarm's inbuilt load balancer (only relevant under Swarm Mode). |
| `traefik.backend.circuitbreaker.expression=EXPR` | Create a [circuit breaker](/basics/#backends) to be used against the backend |
| `traefik.port=80` | Register this port. Useful when the container exposes multiples ports. |
| `traefik.protocol=https` | Override the default `http` protocol |
| `traefik.weight=10` | Assign this weight to the container |
| `traefik.enable=false` | Disable this container in Træfik |
| `traefik.frontend.rule=EXPR` | Override the default frontend rule. Default: `Host:{containerName}.{domain}` or `Host:{service}.{project_name}.{domain}` if you are using `docker-compose`. |
| `traefik.frontend.passHostHeader=true` | Forward client `Host` header to the backend. |
| `traefik.frontend.entryPoints=http,https` | Assign this frontend to entry points `http` and `https`. Overrides `defaultEntryPoints` |
| `traefik.frontend.auth.basic=EXPR` | Sets basic authentication for that frontend in CSV format: `User:Hash,User:Hash` |
| `traefik.frontend.whitelistSourceRange:RANGE` | List of IP-Ranges which are allowed to access. An unset or empty list allows all Source-IPs to access. If one of the Net-Specifications are invalid, the whole list is invalid and allows all Source-IPs to access. |
| `traefik.frontend.headers.customrequestheaders=EXPR ` | Provides the container with custom request headers that will be appended to each request forwarded to the container. Format: `HEADER:value,HEADER2:value2` |
| `traefik.frontend.headers.customresponseheaders=EXPR` | Appends the headers to each response returned by the container, before forwarding the response to the client. Format: `HEADER:value,HEADER2:value2` |
| `traefik.docker.network` | Set the docker network to use for connections to this container. If a container is linked to several networks, be sure to set the proper network name (you can check with `docker inspect <container_id>`) otherwise it will randomly pick one (depending on how docker is returning them). For instance when deploying docker `stack` from compose files, the compose defined networks will be prefixed with the `stack` name. |
if a label is defined both as a `container label` and a `service label` (for example `traefik.<service-name>.port=PORT` and `traefik.port=PORT` ), the `service label` is used to defined the `<service-name>` property (`port` in the example).
It's possible to mix `container labels` and `service labels`, in this case `container labels` are used as default value for missing `service labels` but no frontends are going to be created with the `container labels`.
More details in this [example](/user-guide/docker-and-lets-encrypt/#labels).
