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Add state machine for sandbox and container

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Signed-off-by: Lantao Liu <lantaol@google.com>
This commit is contained in:
Lantao Liu 2019-02-05 00:15:54 -08:00
parent bfd25c80b4
commit 4dc6f6d0b5
2 changed files with 72 additions and 1 deletions
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32
pkg/store/container/status.go
View File

@ -28,6 +28,38 @@ import (
runtime "k8s.io/kubernetes/pkg/kubelet/apis/cri/runtime/v1alpha2"
)
// The container state machine in the CRI plugin:
//
// + +
// | |
// | Create | Load
// | |
// +----v----+ |
// | | |
// | CREATED <---------+-----------+
// | | | |
// +----+----- | |
// | | |
// | Start | |
// | | |
// +----v----+ | |
// Exec +--------+ | | |
// Attach | | RUNNING <---------+ |
// LogReopen +--------> | | |
// +----+----+ | |
// | | |
// | Stop/Exit | |
// | | |
// +----v----+ | |
// | <---------+ +----v----+
// | EXITED | | |
// | <----------------+ UNKNOWN |
// +----+----+ Stop | |
// | +---------+
// | Remove
// v
// DELETED
// statusVersion is current version of container status.
const statusVersion = "v1" // nolint

41
pkg/store/sandbox/status.go
View File

@ -21,8 +21,44 @@ import (
"time"
)
// The sandbox state machine in the CRI plugin:
// + +
// | |
// | Create(Run) | Load
// | |
// Start +----v----+ |
// (failed) | | |
// +-------------+ INIT | +-----------+
// | | | | |
// | +----+----+ | |
// | | | |
// | | Start(Run) | |
// | | | |
// | PortForward +----v----+ | |
// | +------+ | | |
// | | | READY <---------+ |
// | +------> | | |
// | +----+----+ | |
// | | | |
// | | Stop/Exit | |
// | | | |
// | +----v----+ | |
// | | <---------+ +----v----+
// | | NOTREADY| | |
// | | <----------------+ UNKNOWN |
// | +----+----+ Stop | |
// | | +---------+
// | | Remove
// | v
// +-------------> DELETED
// State is the sandbox state we use in containerd/cri.
// It has init state defined.
// It includes init and unknown, which are internal states not defined in CRI.
// The state mapping from internal states to CRI states:
// * ready -> ready
// * not ready -> not ready
// * init -> not exist
// * unknown -> not ready
type State uint32
const (
@ -40,6 +76,9 @@ const (
// cleanup resources other than sandbox container, e.g. network namespace.
// This is an assumption made in CRI.
StateNotReady
// StateUnknown is unknown state. Sandbox only goes
// into unknown state when its status fails to be loaded.
StateUnknown
)
// Status is the status of a sandbox.