Add LCOWHostNetwork annotation for host network namespace sharing - #2851
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takuro-sato wants to merge 3 commits into
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Add LCOWHostNetwork annotation for host network namespace sharing#2851takuro-sato wants to merge 3 commits into
takuro-sato wants to merge 3 commits into
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Signed-off-by: Takuro Sato <takurosato@microsoft.com>
Signed-off-by: Takuro Sato <takurosato@microsoft.com>
Signed-off-by: Takuro Sato <takurosato@microsoft.com>
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This is based on the internal PR: https://msazure.visualstudio.com/ContainerPlatform/_git/Microsoft.hcsshim/pullrequest/15531697
Description
Add a new annotation io.microsoft.virtualmachine.lcow.hostnetwork that configures all containers in a pod to share the UVM's init network namespace instead of creating isolated per-container network namespaces.
Motivation
This is to support ESAN on LCOW.
ESAN sidecar need access to NETLINK_ISCSI sockets, which are network-namespace-scoped. In the default setup, containers run in isolated network namespaces where kernel netlink listeners are not available. This annotation allows the sidecar to communicate with the kernel's scsi_transport_iscsi module and establish iSCSI sessions.
Behavior with the new annotation
Annotation on pod config → all containers (sandbox + workloads) share the UVM's init netns
eth0 stays in init netns and is configured in-place (no MoveInterfaceToNS)
No change to default behavior when annotation is absent
Test
Tested locally on an Azure L1 VM to see if ESAN sidecar can connect to an ESAN instance.