How to use ACD router for EDNS routing

How to write ACD Route configurations for EDNS routing

This page describes how to write configuration for EDNS routing. For configuration in general, see Configuration.

EDNS routing

In your CDN architecture, you might utilize EDNS routing to redirect clients. Whether it’s your own CDN or a third party CDN, the ESB3024 Router supports creating EDNS requests and sending them to any DNS server.

Configuration

To configure EDNS routing, you first need to create a DNS type host. Using confcli:

[user@acd-router ~]# confcli services.routing.hostGroups -w
Running wizard for resource 'hostGroups'

Hint: Hitting return will set a value to its default.
Enter '?' to receive the help string

hostGroups : [
  hostGroup can be one of
    1: dns
    2: host
    3: redirecting
  Choose element index or name: 1
  Adding a 'dns' element
    hostGroup : {
      name (default: ): edns-cdn
      type (default: dns): ⏎
      hosts : [
        host : {
          name (default: ): edns-host
          hostname (default: ): ednshost.com
          ipv6_address (default: ): ⏎
        }
        Add another 'host' element to array 'hosts'? [y/N]: ⏎
      ]
    }
  Add another 'hostGroup' element to array 'hostGroups'? [y/N]: ⏎
]
Generated config:
{
  "hostGroups": [
    {
      "name": "edns-cdn",
      "type": "dns",
      "hosts": [
        {
          "name": "edns-host",
          "hostname": "ednshost.com",
          "ipv6_address": ""
        }
      ]
    }
  ]
}
Merge and apply the config? [y/n]: y

Note that the hostname is the name of the DNS server that will receive the EDNS request. You can now use the DNS host when creating the routing tree, e.g. in a random type rule:

[user@router ~]# confcli services.routing.rules -w
Running wizard for resource 'rules'

Hint: Hitting return will set a value to its default.
Enter '?' to receive the help string

rules : [
  rule can be one of
    1: allow
    2: consistentHashing
    3: contentPopularity
    4: deny
    5: firstMatch
    6: random
    7: rawGroup
    8: rawHost
    9: split
    10: weighted
  Choose element index or name: random
  Adding a 'random' element
    rule : {
      name (default: ): random-rule
      type (default: random): ⏎
      targets : [
        target (default: ): edns-host
        Add another 'target' element to array 'targets'? [y/N]: ⏎
      ]
    }
  Add another 'rule' element to array 'rules'? [y/N]: ⏎
]
Generated config:
{
  "rules": [
    {
      "name": "random-rule",
      "type": "random",
      "targets": [
        "edns-host"
      ]
    }
  ]
}
Merge and apply the config? [y/n]: y
[user@router ~]# confcli services.routing.entrypoint random-rule
services.routing.entrypoint = 'random-rule'

Or simply use it as the entrypoint:

confcli services.routing.entrypoint edns-host