[enhancement]: should use iproute instead of the obsolete net-tools package

[rfc1036]

Enhancement

_render_route() in cloudinit/net/eni.py uses route add ... commands, but the route(8) command part of the net-tools package has been obsolete for a very long time and is usually not installed on modern systems.
cloud-init should use ip route add ... commands from the iproute2 package.

[holmanb]

_render_route() in cloudinit/net/eni.py uses route add ... commands

That is correct.

but the route(8) command part of the net-tools package has been obsolete for a very long time and is usually not installed on modern systems.

also correct

cloud-init should use ip route add ... commands from the iproute2 package.

Does it not?

@rfc1036 Have you observed any incorrect behavior? Do you have evidence of failures due to this command is getting called where it should not?

[dermotbradley]

@rfc1036 I've been doing some work on eni.py recently, indeed I was actually thinking about the use of "ip route" rather than "route" here earlier this week.

I'm going to work on a PR so that this rendering behaves in a similar fashion to other parts of cloud-init, namely that it will check for the presence of the "ip" binary and use that with fallback to the "route" binary.

Hopefully I should be able to raise a PR to address this within the next week.