Traefik | More than 10 domains in a rule | Easier way needed?

Traefik Traefik v2
1

The normal way for a site is to define the hostnames like this.

- "traefik.http.routers.nginx.rule=Host(`domain.com`, `www.domain.com`)"

I have a project with about 10+ domains pointed to the service.... both with and without www. ... the configuration line will be larger and larger.

Is there an easier way to add all domains? Like a text file which can be used for both rules SSL and non-SSL, too?

2

Hello @mf1,

I don't have a real solution for you, but you could try using the HostRegexp matcher, matching (www.)?domain.com. This way would allow defining a single host for both, thus cutting in half the definition size.

3

Hi @tommoulard .

Your idea looks great and perfect for this project. In this scenario it could safe more than 50% of definitions....

Mainly there is one domain with different syntax's. In my example with optional plural "s", optional hyphen "-", optional "www." and of course different TLDs.

- "traefik.http.routers.nginx.rule=HostRegexp(`(www.)?dom(-)?ain(s)?.(tld1|tld2|tld3|tld4)`)"

I've tried the optional www version, too. But this isn't working. Do I need to install more something more?

4

I don't see any issues with your regexp : regex101: build, test, and debug regex
You can use this tool to engineer a regexp that suits your needs :smile:

5

I always get 404 page not found from Traefik proxy. Even I used the smallest rule
- "traefik.http.routers.nginx.rule=HostRegexp(`(www.)?domain.com`)"

Using ...
- "traefik.http.routers.nginx.rule=Host(`domain.com`, `www.domain.com`)"
... everything is working fine.

Using the more complex rule I get additional SSL issue because the LetsEncrypt certificate wasn't pulled, I guess.

It's really enough to just replace Host by HostRegexp parameter? No additional flag is needed?

6

It's because you are not using the correct format to define regexps in the HostRegexp matcher.
You could have done this:

    label:
      traefik.http.routers.nginx.rule: HostRegexp(`{wordwideweb:(www\.)?}domain.com`)

See Regexp Syntax on Traefik Routers Documentation - Traefik

7

Thanks. I've switched all the labels from "hyphen & quotes & equal" to "nothing & colon"
Now it's working with the standard rule. www and non-www.

I also use curly bracket for each rule which is now also named

traefik.http.routers.nginx.rule: HostRegexp(`{worldwideweb:(www\.)?}dom{hyphen:(-)?}ain{plural:(s)?}.{tld:(tld1|tld2|tld3|tld3)}`)

Using the more complex rule the normal domain is working, also with SSL. All other domains showing ERR_SSL_PROTOCOL_ERROR. How can I solve this?

Additional: Is it needed to have unique Match names overall projects running this Traefik instance?

8

I've found the reason why this isn't working. LetsEncrypt isn't usable with HostRegexp. In this case I have to put all domains separately ... this is what I actually wanted to make easier... :smiley: