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Document VETH pair limitation with containers #1376

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Document VETH pair limitation with containers #1376

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cdc8586
Initial plan
Copilot Jan 29, 2026
d1fae96
Document VETH pair limitation with containers
Copilot Jan 29, 2026
915a539
Fix trailing whitespace in YANG descriptions
Copilot Jan 29, 2026
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6 changes: 6 additions & 0 deletions doc/container.md
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Expand Up @@ -668,6 +668,12 @@ set:

For an example of both, see the next section.

> [!IMPORTANT]
> **VETH Pair Limitation:** When using VETH pairs with containers, at least
> one side of the pair must remain in the host namespace. It is currently
> not possible to create VETH pairs where both ends are assigned to different
> containers. One end must always be accessible from the host.

[^3]: Something which the container bridge network type does behind the
scenes with one end of an automatically created VETH pair.

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6 changes: 5 additions & 1 deletion src/confd/yang/confd/infix-if-container.yang
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Expand Up @@ -59,7 +59,11 @@ submodule infix-if-container {

identity host {
base container-network;
description "Host device, e.g., one end of a VETH pair or other host interface.";
description "Host device, e.g., one end of a VETH pair or other host interface.

Note: When using VETH pairs, at least one side must remain in the
host namespace. Both ends of a VETH pair cannot be assigned to
different containers.";
}

/*
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6 changes: 5 additions & 1 deletion src/confd/yang/confd/infix-if-veth.yang
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Expand Up @@ -13,7 +13,11 @@ submodule infix-if-veth {

organization "KernelKit";
contact "kernelkit@googlegroups.com";
description "Linux virtual Ethernet pair extension for ietf-interfaces.";
description "Linux virtual Ethernet pair extension for ietf-interfaces.

Note: When using VETH pairs with containers, at least one side
of the pair must remain in the host namespace. Both ends of a
VETH pair cannot be assigned to different containers.";

revision 2023-06-05 {
description "Initial revision.";
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