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storage: create k8s emptyDir inside VM

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This introduces a new storage type: local. Local storage type will
tell the kata-agent to create an empty directory in the sandbox
directory within the VM.

K8s host emptyDirs will then use the local storage type and mount it
inside each container. By doing this, we utilise the storage medium
that the sandbox uses. In most cases this will be 9p.

If the VM is using device mapper for container storage, the containers
will benefit from the better performance of device mapper for
host emptyDir.

Fixes #1472

Signed-off-by: Alex Price <aprice@atlassian.com>
This commit is contained in:
Alex Price
2019-04-05 11:23:10 +11:00
committed by Alex Price
parent 228d1512d9
commit 76c4639ada
4 changed files with 60 additions and 17 deletions
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5
pkg/katautils/create.go
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@@ -162,7 +162,10 @@ func HandleFactory(ctx context.Context, vci vc.VC, runtimeConfig *oci.RuntimeCon
func SetEphemeralStorageType(ociSpec oci.CompatOCISpec) oci.CompatOCISpec {
for idx, mnt := range ociSpec.Mounts {
if vc.IsEphemeralStorage(mnt.Source) {
ociSpec.Mounts[idx].Type = "ephemeral"
ociSpec.Mounts[idx].Type = vc.KataEphemeralDevType
}
if vc.Isk8sHostEmptyDir(mnt.Source) {
ociSpec.Mounts[idx].Type = vc.KataLocalDevType
}
}
return ociSpec