Sep 2019
20 / 20
Jan 27
2d ago
trajano
Sep '19

To complement defaultRule to get the service name without the stack 15
I am trying to make a common middleware that would strip the path prefix

        - traefik.http.middlewares.strip-prefix.stripprefixregex.regex=/[a-z0-9_]+

However, this causes an issue if I don't put the trailing slash. For example if I put in /whoami2 it keeps it at /whoami2, I want it to redirect to /whoami2/ This is because some apps like Portainer will not work if the path is /portainer but works with /portainer/

I would rather not put in a / at the end explicitly either.

I also tried (updated based on comment by @zespri

        - traefik.http.middlewares.strip-prefix.replacepathregex.regex=^/[a-z0-9_]+
        - traefik.http.middlewares.strip-prefix.replacepathregex.replacement=/

I also did the following which uses a redirectregex also no luck

    - traefik.http.middlewares.strip-prefix.chain.middlewares=strip-prefix-1,strip-prefix-2
    - traefik.http.middlewares.strip-prefix-1.redirectregex.regex=^(https?://[^/]+/[a-z0-9_]+)$$
    - traefik.http.middlewares.strip-prefix-1.redirectregex.replacement=$${1}/
    - traefik.http.middlewares.strip-prefix-1.redirectregex.permanent=true
    - traefik.http.middlewares.strip-prefix-2.stripprefixregex.regex=/[a-z0-9_]+

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    Sep '19

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zespriModerator
Sep '19

I think it's called ReplacePathRegex, not ReplacePath. Also if you use both stripprefixregex and replacepathregex you should give them different names using strip-prefix for both won't work...

trajano
Sep '19

won't that preserve the prefix? I'm trying to remove the prefix that gets sent otherwise we'd have /portainer/portainer/

trajano
Sep '19

Here's the solution

    - traefik.http.middlewares.strip-prefix.chain.middlewares=strip-prefix-1,strip-prefix-2
    - traefik.http.middlewares.strip-prefix-1.redirectregex.regex=^(https?://[^/]+/[a-z0-9_]+)$$
    - traefik.http.middlewares.strip-prefix-1.redirectregex.replacement=$${1}/
    - traefik.http.middlewares.strip-prefix-1.redirectregex.permanent=true
    - traefik.http.middlewares.strip-prefix-2.stripprefixregex.regex=/[a-z0-9_]+
zespriModerator
Sep '19

@trajano why do you have both main and sans the same?

        - traefik.tcp.routers.intranet.tls.domains[0].main=i.trajano.net
        - traefik.tcp.routers.intranet.tls.domains[0].sans=i.trajano.net
3 months later
ipss
trajano
Jan '20

That is the same as in the opening. I am also looking for solution for apps like portainer.

14 days later
pascalandy
Jan '20

@trajano you freaking rock man!! You're my regex God :star_struck: :innocent: :smiling_face_with_three_hearts:

zespriModerator
Jan '20

@pascalandy Also note that in yaml different escaping rules applies depending if you surround your string in quotation marks or not. In your original problem there were quotatation marks. So watch for these too

pascalandy
trajano
Jan '20

@trajano do you happen to know how to do the opposite? Meaning, to remove a slash if there is one

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I'm running

version: "3.3"

services:

  hello:
    image: hashicorp/http-echo
    container_name: hello
    hostname: hello
    restart: unless-stopped
    command: "-listen=':5001' -text='Hello Pascal'"

    labels:
      #### core configs
      - "traefik.enable=true"
      - "traefik.http.routers.hello.rule=Host(`devkiwi.club`) && Path(`/hello`)"
      - "traefik.http.services.hello.loadbalancer.server.port=5001"
      #### set TLS (https)
      - "traefik.http.routers.hello.entrypoints=websecure"
      - "traefik.http.routers.hello.tls=true"
      - "traefik.http.routers.hello.tls.certresolver=leresolver"

      #### https://twitter.com/askpascalandy
1 month later
trajano
Feb '20

Just reversed it here but I haven't tested it

basically the position of the / is swapped.

pascalandy
Feb '20

Thanks will test it!!

11 months later
coltenkrauter
3d

I had some issues with the other recommended solutions here. My goal was to get the /dashboard path to redirect to /dashboard/ so that the traefik dashboard would be easier to get to.

Here is the solution I ended up with... Note, it isn't a catchall and it is hard coded for the /dashboard path, but it is a good starting point that should be easy to expand with wildcards.

      labels:
        - traefik.enable=true

        # required in swarm, but can be any port number. 
        - traefik.http.services.api@internal.loadbalancer.server.port=8080
        - traefik.http.routers.dashboard.rule=Host(`example.com`) && (PathPrefix(`/dashboard`) || PathPrefix(`/api`))
        
        # middlewares
        - traefik.http.middlewares.dashboard-auth.basicauth.users={{ htpasswd }}
        - traefik.http.routers.dashboard.middlewares=dashboard-auth
        
        # Add trailing slash to /dashboard path
        - traefik.http.middlewares.dashboard-strip-slash.redirectregex.regex=(^.*\/dashboard$$)
        - traefik.http.middlewares.dashboard-strip-slash.redirectregex.replacement=$$1/
        - traefik.http.middlewares.dashboard-strip-slash.redirectregex.permanent=false
        - traefik.http.routers.dashboard.middlewares=dashboard-strip-slash

closed 2 days ago