CASMTRIAGE-2793 Add Toggle for Exclusive IPv4

[rustydb]

Summary and Scope

• Relates to CASMTRIAGE-2793

When testing CASMTRIAGE-2793 on MUG, IPv6 networking between the deployment server and client were not fully functional. During those tests, IPv6 was preventing the download of artifacts and the initial call-to-home by dracut. Using this feature MUG was able to deploy itself by forcing IPv4.

By default metal-dracut will use IPv4 unless it is told otherwise by the
new metal.ipv4 argument being set to 0.

Issue Type

• RFE Pull Request

Example:

ncn-m002:~ # set -x
ncn-m002:~ # ping ${metal_ipv4:+-4} 10.1.1.2
+ ping 10.1.1.2
PING 10.1.1.2 (10.1.1.2) 56(84) bytes of data.
64 bytes from 10.1.1.2: icmp_seq=1 ttl=64 time=0.091 ms
64 bytes from 10.1.1.2: icmp_seq=2 ttl=64 time=0.077 ms
^C
--- 10.1.1.2 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1006ms
rtt min/avg/max/mdev = 0.077/0.084/0.091/0.007 ms
ncn-m002:~ # ^C
ncn-m002:~ # metal_ipv4=1
+ metal_ipv4=1
ncn-m002:~ # ping ${metal_ipv4:+-4} 10.1.1.2
+ ping -4 10.1.1.2
PING 10.1.1.2 (10.1.1.2) 56(84) bytes of data.
64 bytes from 10.1.1.2: icmp_seq=1 ttl=64 time=0.089 ms
64 bytes from 10.1.1.2: icmp_seq=2 ttl=64 time=0.061 ms
^C
--- 10.1.1.2 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1009ms
rtt min/avg/max/mdev = 0.061/0.075/0.089/0.014 ms
ncn-m002:~ # curl ${metal_ipv4:+-4} -O "http://pit/ncn-m002/kernel
> ^C
ncn-m002:~ # curl ${metal_ipv4:+-4} -O "http://pit/ncn-m002/kernel"
+ curl -4 -O http://pit/ncn-m002/kernel
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 8846k  100 8846k    0     0   479M      0 --:--:-- --:--:-- --:--:--  479M
ncn-m002:~ # unset metal_ipv4
+ unset metal_ipv4
ncn-m002:~ # curl ${metal_ipv4:+-4} -O "http://pit/ncn-m002/kernel"
+ curl -O http://pit/ncn-m002/kernel
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 8846k  100 8846k    0     0   454M      0 --:--:-- --:--:-- --:--:--  479M

Prerequisites

• I have included documentation in my PR (or it is not required)
• I tested this on internal system (x) (if yes, please include results or a description of the test)

MUG was able to download and fetch artifacts after incorporating this RPM.

Idempotency

Risks and Mitigations

What is less risky, or more risky now - or if your mod fails is there a new risk?

We're no no longer using whatever the environment provides by default, and forcing an older IP catalogue. This is retroactive, in the sense that we may want to remove this in the future.