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Fallback to another server in case of no CNAME records found

Arvancloud Admin requested to merge github/fork/threefoldtech/master_redisfallthrough into master

Created by: xmonader

in case there're no cnames records found, we forward to the next plugin, happens in case of ca1.grid.tf where zerossl tries to validate against specific domains. So, we might be authoritative for the domain a.b.tf, but zerossl wants to create validationtext.a.b.tf cname to point to aaaa.bbb.c.como.g which we can't predict while registering the subdomain, so the solution is we allow forwarding to another nameserver that knows the needed CNAME records and create them during the zerossl communication

. {
    log
    errors

    redis  {
        address 127.0.0.1:6379
    }

    forward . 174.138.6.79 8.8.8.8 1.1.1.1


}

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