api.proto

// To regenerate api.pb.go run hack/update-generated-runtime.sh
syntax = 'proto2';

package runtime;

// Runtime service defines the public APIs for remote container runtimes
service RuntimeService {
    // Version returns the runtime name, runtime version and runtime API version
    rpc Version(VersionRequest) returns (VersionResponse) {}

    // CreatePodSandbox creates a pod-level sandbox.
    // The definition of PodSandbox is at https://github.com/kubernetes/kubernetes/pull/25899
    rpc CreatePodSandbox(CreatePodSandboxRequest) returns (CreatePodSandboxResponse) {}
    // StopPodSandbox stops the running sandbox. If there are any running
    // containers in the sandbox, they should be forcibly terminated.
    rpc StopPodSandbox(StopPodSandboxRequest) returns (StopPodSandboxResponse) {}
    // RemovePodSandbox removes the sandbox. If there are any running containers in the
    // sandbox, they should be forcibly removed.
    // It should return success if the sandbox has already been removed.
    rpc RemovePodSandbox(RemovePodSandboxRequest) returns (RemovePodSandboxResponse) {}
    // PodSandboxStatus returns the status of the PodSandbox.
    rpc PodSandboxStatus(PodSandboxStatusRequest) returns (PodSandboxStatusResponse) {}
    // ListPodSandbox returns a list of SandBox.
    rpc ListPodSandbox(ListPodSandboxRequest) returns (ListPodSandboxResponse) {}

    // CreateContainer creates a new container in specified PodSandbox
    rpc CreateContainer(CreateContainerRequest) returns (CreateContainerResponse) {}
    // StartContainer starts the container.
    rpc StartContainer(StartContainerRequest) returns (StartContainerResponse) {}
    // StopContainer stops a running container with a grace period (i.e., timeout).
    rpc StopContainer(StopContainerRequest) returns (StopContainerResponse) {}
    // RemoveContainer removes the container. If the container is running, the
    // container should be forcibly removed.
    // It should return success if the container has already been removed.
    rpc RemoveContainer(RemoveContainerRequest) returns (RemoveContainerResponse) {}
    // ListContainers lists all containers by filters.
    rpc ListContainers(ListContainersRequest) returns (ListContainersResponse) {}
    // ContainerStatus returns status of the container.
    rpc ContainerStatus(ContainerStatusRequest) returns (ContainerStatusResponse) {}

    // Exec executes the command in the container.
    rpc Exec(stream ExecRequest) returns (stream ExecResponse) {}
}

// Image service defines the public APIs for managing images
service ImageService {
    // ListImages lists existing images.
    rpc ListImages(ListImagesRequest) returns (ListImagesResponse) {}
    // ImageStatus returns the status of the image.
    rpc ImageStatus(ImageStatusRequest) returns (ImageStatusResponse) {}
    // PullImage pulls an image with authentication config.
    rpc PullImage(PullImageRequest) returns (PullImageResponse) {}
    // RemoveImage removes the image.
    // It should return success if the image has already been removed.
    rpc RemoveImage(RemoveImageRequest) returns (RemoveImageResponse) {}
}

message VersionRequest {
    // The version of kubelet runtime API.
    optional string version = 1;
}

message VersionResponse {
    // The version of the kubelet runtime API.
    optional string version = 1;
    // The name of the container runtime.
    optional string runtime_name = 2;
    // The version of the container runtime.
    optional string runtime_version = 3;
    // The API version of the container runtime.
    optional string runtime_api_version = 4;
}

// DNSOption specifies the DNS servers and search domains.
message DNSOption {
    // List of DNS servers of the cluster.
    repeated string servers = 1;
    // List of DNS search domains of the cluster.
    repeated string searches = 2;
}

enum Protocol {
    TCP = 0;
    UDP = 1;
}

// PortMapping specifies the port mapping configurations of sandbox
message PortMapping {
    // The name of the port mapping
    optional string name = 1;
    // The protocol of the port mapping.
    optional Protocol protocol = 2;
    // The port number within the container.
    optional int32 container_port = 3;
    // The port number on the host.
    optional int32 host_port = 4;
    // The host IP.
    optional string host_ip = 5;
}

// Mount specifies the volume mount for the sandbox
message Mount {
    // The name of the volume mount.
    optional string name = 1;
    // The path of the mount within the container.
    optional string container_path = 2;
    // The path of the mount on the host.
    optional string host_path = 3;
    // If set, the mount is read-only.
    optional bool readonly = 4;
    // If set, the mount needs SELinux relabeling
    optional bool selinux_relabel = 5;
}

// ResourceRequirements contains a set of resources
// Valid resources are:
// - cpu, in cores. (500m = .5 cores)
// - memory, in bytes. (500Gi = 500GiB = 500 * 1024 * 1024 * 1024)
message ResourceRequirements {
    // The maximum amount of compute resources allowed.
    optional double limits = 1;
    // The minimum amount of compute resources required.
    // If Request is omitted for a container, it defaults to Limits if that is explicitly specified, otherwise to an implementation-defined value
    optional double requests = 2;
}

// PodSandboxResources contains the CPU/memory resource requirements.
message PodSandboxResources {
    // CPU resource requirement.
    optional ResourceRequirements cpu = 1;
    // Memory resource requirement.
    optional ResourceRequirements memory = 2;
}

// NamespaceOption provides options for Linux namespaces.
message NamespaceOption {
    // If set, use the host's network namespace.
    optional bool host_network = 1;
    // If set, use the host's pid namesapce.
    optional bool host_pid = 2;
    // If set, use the host's ipc namespace.
    optional bool host_ipc = 3;
}

// LinuxPodSandboxConfig holds platform-specific configuraions for Linux
// host platforms and Linux-based containers.
message LinuxPodSandboxConfig {
    // The parent cgroup of the pod sandbox.
    // The cgroupfs style syntax will be used, but the container runtime can 
    // convert it to systemd semantices if needed.
    optional string cgroup_parent = 1;
    // The configurations for the sandbox's namespaces.
    // This will be used only if the PodSandbox uses namespace for isolation.
    optional NamespaceOption namespace_options = 2;
}

// PodSandboxConfig holds all the required and optional fields for creating a
// sandbox.
message PodSandboxConfig {
    // The name of the sandbox.
    optional string name = 1;
    // The hostname of the sandbox.
    optional string hostname = 2;
    // Path to the directory on the host in which container log files are
    // stored.
    // By default the log of a container going into the LogDirectory will be
    // hooked up to STDOUT and STDERR. However, the LogDirectory may contain
    // binary log files with structured logging data from the individual
    // containers. For example, the files might be newline separated JSON
    // structured logs, systemd-journald journal files, gRPC trace files, etc.
    // E.g.,
    //     PodSandboxConfig.LogDirectory = `/var/log/pods/<podUID>/`
    //     ContainerConfig.LogPath = `containerName_Instance#.log`
    //
    // WARNING: Log management and how kubelet should interface with the
    // container logs are under active discussion in
    // https://issues.k8s.io/24677. There *may* be future change of direction
    // for logging as the discussion carries on.
    optional string log_directory = 3;
    // The DNS options for the sandbox.
    optional DNSOption dns_options = 4;
    // The port mappings for the sandbox.
    repeated PortMapping port_mappings = 5;
    // Resources specifies the resource limits for the sandbox (i.e., the
    // aggregate cpu/memory resources limits of all containers).
    // Note: On a Linux host, kubelet will create a pod-level cgroup and pass
    // it as the cgroup parent for the PodSandbox. For some runtimes, this is
    // sufficient. For others, e.g., hypervisor-based runtimes, explicit
    // resource limits for the sandbox are needed at creation time.
    optional PodSandboxResources resources  = 6;
    // Labels are key value pairs that may be used to scope and select individual resources.
    map<string, string> labels = 7;
    // Annotations is an unstructured key value map that may be set by external
    // tools to store and retrieve arbitrary metadata.
    map<string, string> annotations = 8;
    // Optional configurations specific to Linux hosts.
    optional LinuxPodSandboxConfig linux = 9;
}

message CreatePodSandboxRequest {
    // The configuration for creating a PodSandBox.
    optional PodSandboxConfig config = 1;
}

message CreatePodSandboxResponse {
    // The id of the PodSandBox
    optional string pod_sandbox_id = 1;
}

message StopPodSandboxRequest {
    // The id of the PodSandBox
    optional string pod_sandbox_id = 1;
}

message StopPodSandboxResponse {}

message RemovePodSandboxRequest {
    // The id of the PodSandBox
    optional string pod_sandbox_id = 1;
}

message RemovePodSandboxResponse {}

message PodSandboxStatusRequest {
    // The id of the PodSandBox
    optional string pod_sandbox_id = 1;
}

// PodSandboxNetworkStatus is the status of the network for a PodSandbox.
message PodSandboxNetworkStatus {
    // The IP address of the PodSandbox
    optional string ip = 1;
}

// Namespace contains paths to the namespaces.
message Namespace {
    // Network is the path to the network namespace.
    optional string network = 1;
    // Options is the namespace options for linux namespaces
    optional NamespaceOption options = 2;
}

// LinuxSandBoxStatus contains status specific to Linux sandboxes.
message LinuxPodSandboxStatus {
    // Namespaces contains paths to the sandbox's namespaces.
    optional Namespace namespaces = 1;
}

enum PodSandBoxState {
    READY = 0;
    NOTREADY = 1;
}

// PodSandboxStatus contains the status of the PodSandbox.
message PodSandboxStatus {
    // ID of the sandbox.
    optional string id = 1;
    // Name of the sandbox
    optional string name = 2;
    // State of the sandbox.
    optional PodSandBoxState state = 3;
    // Creation timestamp of the sandbox
    optional int64 created_at = 4;
    // Network contains network status if network is handled by the runtime.
    optional PodSandboxNetworkStatus network = 5;
    // Linux specific status to a pod sandbox.
    optional LinuxPodSandboxStatus linux = 6;
    // Labels are key value pairs that may be used to scope and select individual resources.
    map<string, string> labels = 7;
    // Annotations is an unstructured key value map that may be set by external
    // tools to store and retrieve arbitrary metadata.
    map<string, string> annotations = 8;
}

message PodSandboxStatusResponse {
    // The status of the PodSandbox
    optional PodSandboxStatus status = 1;
}

// PodSandboxFilter is used to filter a list of PodSandboxes.
// All those fields are combined with 'AND'
message PodSandboxFilter {
    // Name of the sandbox.
    optional string name = 1;
    // ID of the sandbox.
    optional string id = 2;
    // State of the sandbox.
    optional PodSandBoxState state = 3;
    // LabelSelector to select matches.
    // Only api.MatchLabels is supported for now and the requirements
    // are ANDed. MatchExpressions is not supported yet.
    map<string, string> label_selector = 4;
}

message ListPodSandboxRequest {
    // PodSandboxFilter to filter a list of PodSandboxes.
    optional PodSandboxFilter filter = 1;
}


// PodSandbox contains minimal information about a sandbox.
message PodSandbox {
    // The id of the PodSandbox
    optional string id = 1;
    // The name of the PodSandbox
    optional string name = 2;
    // The state of the PodSandbox
    optional PodSandBoxState state = 3;
    // Creation timestamps of the sandbox
    optional int64 created_at = 4;
    // The labels of the PodSandbox
    map<string, string> labels = 5;
}

message ListPodSandboxResponse {
    // List of PodSandbox
    repeated PodSandbox items = 1;
}

// ImageSpec is an internal representation of an image.  Currently, it wraps the
// value of a Container's Image field (e.g. imageName, imageName:tag, or
// imageName:digest), but in the future it will include more detailed
// information about the different image types.
message ImageSpec {
    optional string image = 1;
}

message KeyValue {
    optional string key = 1;
    optional string value = 2;
}

// LinuxContainerResources specifies Linux specific configuration for
// resources.
// TODO: Consider using Resources from opencontainers/runtime-spec/specs-go
// directly.
message LinuxContainerResources {
    // CPU CFS (Completely Fair Scheduler) period
    optional int64 cpu_period = 1;
    // CPU CFS (Completely Fair Scheduler) quota
    optional int64 cpu_quota = 2;
    // CPU shares (relative weight vs. other containers)
    optional int64 cpu_shares = 3;
    // Memory limit in bytes
    optional int64 memory_limit_in_bytes = 4;
    // OOMScoreAdj adjusts the oom-killer score.
    optional int64 oom_score_adj = 5;
}

// SELinuxOption are the labels to be applied to the container.
message SELinuxOption {
    optional string user = 1;
    optional string role = 2;
    optional string type = 3;
    optional string level = 4;
}

// Capability contains the container capabilities to add or drop
message Capability {
    // List of capabilities to add.
    repeated string add_capabilities = 1;
    // List of capabilities to drop.
    repeated string drop_capabilities = 2;
}

// LinuxContainerConfig contains platform-specific configuration for
// Linux-based containers.
message LinuxContainerConfig {
    // Resources specification for the container.
    optional LinuxContainerResources resources = 1;
    // Capabilities to add or drop.
    optional Capability capabilities = 2;
    // Optional SELinux context to be applied.
    optional SELinuxOption selinux_options = 3;
    // User contains the user for the container process.
    optional LinuxUser user = 4;
}

message LinuxUser {
    // uid specifies the user ID the container process has.
    optional int64 uid = 1;
    // gid specifies the group ID the container process has.
    optional int64 gid = 2;
    // additional_gids specifies additional GIDs the container process has.
    repeated int64 additional_gids = 3;
}

message ContainerConfig {
    // Name of the container.
    optional string name = 1;
    // Image to use.
    optional ImageSpec image = 2;
    // Command to execute (i.e., entrypoint for docker)
    repeated string command = 3;
    // Args for the Command (i.e., command for docker)
    repeated string args = 4;
    // Current working directory of the command.
    optional string working_dir = 5;
    // List of environment variable to set in the container
    repeated KeyValue envs = 6;
    // Mounts specifies mounts for the container
    repeated Mount mounts = 7;
    // Labels are key value pairs that may be used to scope and select individual resources.
    // Label keys are of the form:
    //     label-key ::= prefixed-name | name
    //     prefixed-name ::= prefix '/' name
    //     prefix ::= DNS_SUBDOMAIN
    //     name ::= DNS_LABEL
    map<string, string> labels = 8;
    // Annotations is an unstructured key value map that may be set by external
    // tools to store and retrieve arbitrary metadata.
    map<string, string> annotations = 9;
    // If set, run container in privileged mode.
    // Processes in privileged containers are essentially equivalent to root on the host.
    optional bool privileged = 10;
    // If set, the root filesystem of the container is read-only.
    optional bool readonly_rootfs = 11;
    // Path relative to PodSandboxConfig.LogDirectory for container to store
    // the log (STDOUT and STDERR) on the host.
    // E.g.,
    //     PodSandboxConfig.LogDirectory = `/var/log/pods/<podUID>/`
    //     ContainerConfig.LogPath = `containerName_Instance#.log`
    //
    // WARNING: Log management and how kubelet should interface with the
    // container logs are under active discussion in
    // https://issues.k8s.io/24677. There *may* be future change of direction
    // for logging as the discussion carries on.
    optional string log_path = 12;
    // The hash of container config

    // Variables for interactive containers, these have very specialized
    // use-cases (e.g. debugging).
    // TODO: Determine if we need to continue supporting these fields that are
    // part of Kubernetes's Container Spec.
    optional bool stdin = 13;
    optional bool stdin_once = 14;
    optional bool tty = 15;

    // Linux contains configuration specific to Linux containers.
    optional LinuxContainerConfig linux = 16;
}

message CreateContainerRequest {
    // The id of the PodSandbox
    optional string pod_sandbox_id = 1;
    // The config of the container
    optional ContainerConfig config = 2;
    // The config of the PodSandbox
    optional PodSandboxConfig sandbox_config = 3;
}

message CreateContainerResponse {
    // The id of the created container
    optional string container_id = 1;
}

message StartContainerRequest {
    // The id of the container
    optional string container_id = 1;
}

message StartContainerResponse {}

message StopContainerRequest {
    // The id of the container
    optional string container_id = 1;
    // Timeout in seconds to stop the container
    optional int64 timeout = 2;
}

message StopContainerResponse {}

message RemoveContainerRequest {
    // The id of the container
    optional string container_id = 1;
}

message RemoveContainerResponse {}

enum ContainerState {
    CREATED = 0;
    RUNNING = 1;
    EXITED  = 2;
    UNKNOWN = 3;
}

// ContainerFilter is used to filter containers.
// All those fields are combined with 'AND'
message ContainerFilter {
    // Name of the container.
    optional string name = 1;
    // ID of the container.
    optional string id = 2;
    // State of the contianer.
    optional ContainerState state = 3;
    // The id of the pod sandbox
    optional string pod_sandbox_id = 4;
    // LabelSelector to select matches.
    // Only api.MatchLabels is supported for now and the requirements
    // are ANDed. MatchExpressions is not supported yet.
    map<string, string> label_selector = 5;
}

message ListContainersRequest {
    optional ContainerFilter filter = 1;
}

// Container provides the runtime information for a container, such as ID, hash,
// state of the container.
message Container {
    // The ID of the container, used by the container runtime to identify
    // a container.
    optional string id = 1;
    // The name of the container
    optional string name = 2;
     // The spec of the image
    optional ImageSpec image = 3;
    // Reference to the image in use. For most runtimes, this should be an
    // image ID.
    optional string image_ref = 4;
    // State is the state of the container.
    optional ContainerState state = 5;
    // Labels are key value pairs that may be used to scope and select individual resources.
    map<string, string> labels = 6;
}

message ListContainersResponse {
    // List of containers
    repeated Container containers = 1;
}

message ContainerStatusRequest {
    // The id of the container
    optional string container_id = 1;
}

// ContainerStatus represents the status of a container.
message ContainerStatus {
    // ID of the container.
    optional string id = 1;
    // Name of the container.
    optional string name = 2;
    // Status of the container.
    optional ContainerState state = 3;
    // Creation time of the container.
    optional int64 created_at = 4;
    // Start time of the container.
    optional int64 started_at = 5;
    // Finish time of the container.
    optional int64 finished_at = 6;
    // Exit code of the container.
    optional int32 exit_code = 7;
     // The spec of the image
    optional ImageSpec image = 8;
    // Reference to the image in use. For most runtimes, this should be an
    // image ID
    optional string image_ref = 9;
    // A string explains why container is in such a status.
    optional string reason = 10;
    // Labels are key value pairs that may be used to scope and select individual resources.
    map<string,string> labels = 11;
    // Annotations is an unstructured key value map.
    map<string,string> annotations = 12;
    // Mounts specifies mounts for the container
    repeated Mount mounts = 13;
}

message ContainerStatusResponse {
    // The status of the container
    optional ContainerStatus status = 1;
}

message ExecRequest {
    // The id of the container
    optional string container_id = 1;
    // The cmd to execute
    repeated string cmd = 2;
    // Whether use tty
    optional bool tty = 3;
    // Streaming stdin
    optional bytes stdin = 4;
}

message ExecResponse {
    // Streaming stdout
    optional bytes stdout = 1;
    // Streaming stderr
    optional bytes stderr = 2;
}

message ImageFilter {
    // The spec of the image
    optional ImageSpec image = 1;
}

message ListImagesRequest {
    // The filter to list images
    optional ImageFilter filter = 1;
}

// Basic information about a container image.
message Image {
    // ID of the image.
    optional string id = 1;
    // Other names by which this image is known.
    repeated string repo_tags = 2;
    // Digests by which this image is known.
    repeated string repo_digests = 3;
    // The size of the image in bytes.
    optional uint64 size = 4;
}

message ListImagesResponse {
    // List of images
    repeated Image images = 1;
}

message ImageStatusRequest {
    // The spec of the image
    optional ImageSpec image = 1;
}

message ImageStatusResponse {
    // The status of the image
    optional Image image = 1;
}

// AuthConfig contains authorization information for connecting to a registry.
message AuthConfig {
    optional string username = 1;
    optional string password = 2;
    optional string auth = 3;
    optional string server_address = 4;
    // IdentityToken is used to authenticate the user and get
    // an access token for the registry.
    optional string identity_token = 5;
    // RegistryToken is a bearer token to be sent to a registry
    optional string registry_token = 6;
}

message PullImageRequest {
    // The spec of the image
    optional ImageSpec image = 1;
    // The auth config for pulling image
    optional AuthConfig auth = 2;
    // The config of the PodSandbox, which is used to pull image in PodSandbox context
    optional PodSandboxConfig sandbox_config = 3;
}

message PullImageResponse {}

message RemoveImageRequest {
    // The spec of the image
    optional ImageSpec image = 1;
}

message RemoveImageResponse {}