Re: Ridding unpredictable predictable interface names

Martin Simons <[email protected]> writes:

> I have two lists that I want to pair, like this: macs slist => {
> '52:54:00:64:0d:0c', '52:54:00:64:0d:0d ' }; Interfaces slist => {
> 'eth1', 'eth2' }; I want an array or container like this:
> persistent[eth1] string => '52:54:00:64:0d:0c'; persistent[eth2]
> string => '52:54:00:64:0d:0d'; I looked over the functions again and
> again but I do not get it right. How do I pair those into an array?


I don't think that there are any native functions that deal with mapping
mac addresses to interface names, only interface names and IP addresses
([iprange()]). [sys.hardware_mac] maps mac addresses to interface names.

,----
| bundle agent __main__
| {
|   reports:
|     "$(with)" with => storejson( "sys.hardware_mac" );
| }
`----
Listing 1: Example Policy

,----
| R: {
|   "docker0": "02:42:3f:46:7c:ce",
|   "enx5cff35c6864b": "5c:ff:35:c6:86:4b",
|   "tun0": "00:00:00:00:00:00",
|   "vboxnet0": "0a:00:27:00:00:00"
| }
`----


Are you able to use that directly?

If not, you need some way to link the mac address to the name, it's not
clear to me from above what that mapping data looks like. How do you
know that mac `52:54:00:64:0d:0d' should be mapped to `eth2'?


[iprange()]
<https://docs.cfengine.com/docs/3.18/reference-functions-iprange.html>

[sys.hardware_mac]
<https://docs.cfengine.com/docs/3.18/reference-special-variables-sys.html#sys-hardware_mac-interface_name>

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Nick Anderson | Doer of Things | (+1) 785-550-1767 | https://northern.tech

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