[feature-request] Support for ISC-Kea

[clontarfx]

Internet Systems Consortium has posted notification that ISC-DHCP is no longer supported as of 2022.

• https://www.isc.org/blogs/isc-dhcp-eol/

Canonical has announced that ISC-Kea is being made available in Noble Numbat 24.04 as a replacement for ISC-DHCP.

• https://discourse.ubuntu.com/t/noble-numbat-release-notes/39890#kea-40

Webmin should support the incoming ISC-Kea DHCP server in order to make it "feature-compatible" with upcoming Ubuntu releases. This could/should be a standard module, or a third-party module.

[jcameron]

Interesting, I didn't know that! Does ISC-Kea use the same config format as the old ISC-DHCPd ?

[clontarfx]

ISC have provided a Kea migration tool (KeaMA) that translates ISC-DHCP to ISC-Kea working configurations.

• https://dhcp.isc.org/

The tool outputs JSON. This can be tested by;

• Using a simple DHCP configuration: https://gist.githubusercontent.com/paul-ridgway/e419f7e52258db142326b691d0450be3/raw/b7a6cacb098fbc021054580adb02869f5152f33f/simple-dhcpd.conf

Example output;

{
  /// This configuration declares some subnets but has no interfaces-config
  /// Reference Kea #245
  "Dhcp4": {
    "valid-lifetime": 86400,
    "max-valid-lifetime": 86400,
    "authoritative": true,
//  "config": [
//    /// log-facility is not supported
//    /// Please use the KEA_LOGGER_DESTINATION environment variable instead
//    {
//      "name": "log-facility",
//      "code": 44,
//      "value": "local7"
//    }
//  ],
    "subnet4": [
      {
        "id": 1,
        "subnet": "192.168.1.0/24",
        "pools": [
          {
            "pool": "192.168.1.100 - 192.168.1.200"
          }
        ],
        "option-data": [
          {
            "space": "dhcp4",
            "name": "domain-name",
            "code": 15,
            "data": "home.ridgway.io"
          },
          {
            "space": "dhcp4",
            "name": "domain-name-servers",
            "code": 6,
            "data": "192.168.1.50, 8.8.8.8, 8.8.4.4"
          },
          {
            "space": "dhcp4",
            "name": "routers",
            "code": 3,
            "data": "192.168.1.1"
          }
        ]
      }
    ]
  }
}

[swelljoe]

That doesn't really solve anything for a Webmin module, which needs to read and write the native config file format.

[clontarfx]

Granted, the examples were given to answer @jcameron regarding file format.

[jcameron]

Yeah if the config file format is different, it will take us a fair bit of work to support the new DHCP server.