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client: fix IPv6-only CNI interface support

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Fix a regression introduced in Nomad 1.9.0 where CNI bridge networking with
IPv6-only interfaces would fail with 'no interface with an address' error.

The issue was that while the code correctly populated the AddressIPv6 field
for IPv6 addresses, several validation checks only examined the Address field
(IPv4), causing IPv6-only configurations to be rejected.

Changes:
- Update interface selection logic in cniToAllocNet to accept interfaces with
  either IPv4 or IPv6 addresses (not just IPv4)
- Update fallback logic to check both Address and AddressIPv6 fields
- Update error check to only fail when both IPv4 and IPv6 are missing
- Update AllocNetworkStatus.IsZero() to check AddressIPv6 field

This allows CNI configurations with IPv6-only interfaces to work correctly,
restoring functionality from Nomad 1.8.x.

Fixes #26905
This commit is contained in:
Dmitrii Andreev
2025-10-08 17:30:14 +03:00
parent d058761dc7
commit 1136fd342c
2 changed files with 6 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
client/allocrunner/networking_cni.go
View File

@@ -480,8 +480,8 @@ func (c *cniNetworkConfigurator) cniToAllocNet(res *cni.Result) (*structs.AllocN
}
}
// found a good interface, so we're done
if netStatus.Address != "" {
// found a good interface (with either IPv4 or IPv6), so we're done
if netStatus.Address != "" || netStatus.AddressIPv6 != "" {
netStatus.InterfaceName = name
return
}
@@ -493,7 +493,7 @@ func (c *cniNetworkConfigurator) cniToAllocNet(res *cni.Result) (*structs.AllocN
// If no IP address was found, use the first interface with an address
// found as a fallback
if netStatus.Address == "" {
if netStatus.Address == "" && netStatus.AddressIPv6 == "" {
setStatus(false)
c.logger.Debug("no sandbox interface with an address found CNI result, using first available",
"interface", netStatus.InterfaceName,
@@ -501,8 +501,8 @@ func (c *cniNetworkConfigurator) cniToAllocNet(res *cni.Result) (*structs.AllocN
)
}
// If no IP address could be found, return an error
if netStatus.Address == "" {
// If no IP address (IPv4 or IPv6) could be found, return an error
if netStatus.Address == "" && netStatus.AddressIPv6 == "" {
return nil, fmt.Errorf("failed to configure network: no interface with an address")
}