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CRI: Fix no CNI info for pod sandbox on restart

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Due to when we were updating the pod sandboxes underlying container
object, the pointer to the sandbox would have the right info, but
the on-disk representation of the data was behind. This would cause
the data returned from loading any sandboxes after a restart to have
no CNI result or IP information for the pod.

This change does an additional update to the on-disk container info
right after we invoke the CNI plugin so the metadata for the CNI result
and other networking information is properly flushed to disk.

Signed-off-by: Danny Canter <danny@dcantah.dev>
This commit is contained in:
Danny Canter 2022-12-20 02:04:34 -08:00
parent 8f7cfbda29
commit 3ee6dd5c1b
2 changed files with 25 additions and 1 deletions
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15
integration/restart_test.go
View File

@ -179,6 +179,21 @@ func TestContainerdRestart(t *testing.T) {
if s.id == loaded.Id {
t.Logf("Checking sandbox state for '%s'", s.name)
assert.Equal(t, s.state, loaded.State)
// See https://github.com/containerd/containerd/issues/7843 for details.
// Test that CNI result and sandbox IPs are still present after restart.
if loaded.State == runtime.PodSandboxState_SANDBOX_READY {
status, info, err := SandboxInfo(loaded.Id)
require.NoError(t, err)
// Check that the NetNS didn't close on us, that we still have
// the CNI result, and that we still have the IP we were given
// for this pod.
require.False(t, info.NetNSClosed)
require.NotNil(t, info.CNIResult)
require.NotNil(t, status.Network)
require.NotEmpty(t, status.Network.Ip)
}
break
}
}

11
pkg/cri/server/sandbox_run.go
View File

@ -280,7 +280,8 @@ func (c *criService) RunPodSandbox(ctx context.Context, r *runtime.RunPodSandbox
// Update spec of the container
containerd.UpdateContainerOpts(containerd.WithSpec(spec)),
// Update sandbox metadata to include NetNS info
containerd.UpdateContainerOpts(containerd.WithContainerExtension(sandboxMetadataExtension, &sandbox.Metadata))); err != nil {
containerd.UpdateContainerOpts(containerd.WithContainerExtension(sandboxMetadataExtension, &sandbox.Metadata)),
); err != nil {
return nil, fmt.Errorf("failed to update the network namespace for the sandbox container %q: %w", id, err)
}
@ -310,6 +311,14 @@ func (c *criService) RunPodSandbox(ctx context.Context, r *runtime.RunPodSandbox
return nil, fmt.Errorf("failed to setup network for sandbox %q: %w", id, err)
}
// Update metadata here to save CNI result and pod IPs to disk.
if err := container.Update(ctx,
// Update sandbox metadata to include NetNS info
containerd.UpdateContainerOpts(containerd.WithContainerExtension(sandboxMetadataExtension, &sandbox.Metadata)),
); err != nil {
return nil, fmt.Errorf("failed to update the network namespace for the sandbox container %q: %w", id, err)
}
sandboxCreateNetworkTimer.UpdateSince(netStart)
}