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types.go
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/*
Copyright 2014 The Kubernetes Authors All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package api
import (
"k8s.io/kubernetes/pkg/api/resource"
"k8s.io/kubernetes/pkg/api/unversioned"
"k8s.io/kubernetes/pkg/fields"
"k8s.io/kubernetes/pkg/labels"
"k8s.io/kubernetes/pkg/runtime"
"k8s.io/kubernetes/pkg/types"
"k8s.io/kubernetes/pkg/util"
)
// Common string formats
// ---------------------
// Many fields in this API have formatting requirements. The commonly used
// formats are defined here.
//
// C_IDENTIFIER: This is a string that conforms to the definition of an "identifier"
// in the C language. This is captured by the following regex:
// [A-Za-z_][A-Za-z0-9_]*
// This defines the format, but not the length restriction, which should be
// specified at the definition of any field of this type.
//
// DNS_LABEL: This is a string, no more than 63 characters long, that conforms
// to the definition of a "label" in RFCs 1035 and 1123. This is captured
// by the following regex:
// [a-z0-9]([-a-z0-9]*[a-z0-9])?
//
// DNS_SUBDOMAIN: This is a string, no more than 253 characters long, that conforms
// to the definition of a "subdomain" in RFCs 1035 and 1123. This is captured
// by the following regex:
// [a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*
// or more simply:
// DNS_LABEL(\.DNS_LABEL)*
//
// IANA_SVC_NAME: This is a string, no more than 15 characters long, that
// conforms to the definition of IANA service name in RFC 6335.
// It must contains at least one letter [a-z] and it must contains only [a-z0-9-].
// Hypens ('-') cannot be leading or trailing character of the string
// and cannot be adjacent to other hyphens.
// ObjectMeta is metadata that all persisted resources must have, which includes all objects
// users must create.
type ObjectMeta struct {
// Name is unique within a namespace. Name is required when creating resources, although
// some resources may allow a client to request the generation of an appropriate name
// automatically. Name is primarily intended for creation idempotence and configuration
// definition.
Name string `json:"name,omitempty"`
// GenerateName indicates that the name should be made unique by the server prior to persisting
// it. A non-empty value for the field indicates the name will be made unique (and the name
// returned to the client will be different than the name passed). The value of this field will
// be combined with a unique suffix on the server if the Name field has not been provided.
// The provided value must be valid within the rules for Name, and may be truncated by the length
// of the suffix required to make the value unique on the server.
//
// If this field is specified, and Name is not present, the server will NOT return a 409 if the
// generated name exists - instead, it will either return 201 Created or 500 with Reason
// ServerTimeout indicating a unique name could not be found in the time allotted, and the client
// should retry (optionally after the time indicated in the Retry-After header).
GenerateName string `json:"generateName,omitempty"`
// Namespace defines the space within which name must be unique. An empty namespace is
// equivalent to the "default" namespace, but "default" is the canonical representation.
// Not all objects are required to be scoped to a namespace - the value of this field for
// those objects will be empty.
Namespace string `json:"namespace,omitempty"`
// SelfLink is a URL representing this object.
SelfLink string `json:"selfLink,omitempty"`
// UID is the unique in time and space value for this object. It is typically generated by
// the server on successful creation of a resource and is not allowed to change on PUT
// operations.
UID types.UID `json:"uid,omitempty"`
// An opaque value that represents the version of this resource. May be used for optimistic
// concurrency, change detection, and the watch operation on a resource or set of resources.
// Clients must treat these values as opaque and values may only be valid for a particular
// resource or set of resources. Only servers will generate resource versions.
ResourceVersion string `json:"resourceVersion,omitempty"`
// A sequence number representing a specific generation of the desired state.
// Currently only implemented by replication controllers.
Generation int64 `json:"generation,omitempty"`
// CreationTimestamp is a timestamp representing the server time when this object was
// created. It is not guaranteed to be set in happens-before order across separate operations.
// Clients may not set this value. It is represented in RFC3339 form and is in UTC.
CreationTimestamp unversioned.Time `json:"creationTimestamp,omitempty"`
// DeletionTimestamp is the time after which this resource will be deleted. This
// field is set by the server when a graceful deletion is requested by the user, and is not
// directly settable by a client. The resource will be deleted (no longer visible from
// resource lists, and not reachable by name) after the time in this field. Once set, this
// value may not be unset or be set further into the future, although it may be shortened
// or the resource may be deleted prior to this time. For example, a user may request that
// a pod is deleted in 30 seconds. The Kubelet will react by sending a graceful termination
// signal to the containers in the pod. Once the resource is deleted in the API, the Kubelet
// will send a hard termination signal to the container.
DeletionTimestamp *unversioned.Time `json:"deletionTimestamp,omitempty"`
// DeletionGracePeriodSeconds records the graceful deletion value set when graceful deletion
// was requested. Represents the most recent grace period, and may only be shortened once set.
DeletionGracePeriodSeconds *int64 `json:"deletionGracePeriodSeconds,omitempty"`
// 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
// The prefix is optional. If the prefix is not specified, the key is assumed to be private
// to the user. Other system components that wish to use labels must specify a prefix. The
// "kubernetes.io/" prefix is reserved for use by kubernetes components.
// TODO: replace map[string]string with labels.LabelSet type
Labels map[string]string `json:"labels,omitempty"`
// Annotations are unstructured key value data stored with a resource that may be set by
// external tooling. They are not queryable and should be preserved when modifying
// objects. Annotation keys have the same formatting restrictions as Label keys. See the
// comments on Labels for details.
Annotations map[string]string `json:"annotations,omitempty"`
}
const (
// NamespaceDefault means the object is in the default namespace which is applied when not specified by clients
NamespaceDefault string = "default"
// NamespaceAll is the default argument to specify on a context when you want to list or filter resources across all namespaces
NamespaceAll string = ""
// NamespaceNone is the argument for a context when there is no namespace.
NamespaceNone string = ""
// NamespaceSystem is the system namespace where we place system components.
NamespaceSystem string = "kube-system"
// TerminationMessagePathDefault means the default path to capture the application termination message running in a container
TerminationMessagePathDefault string = "/dev/termination-log"
)
// Volume represents a named volume in a pod that may be accessed by any containers in the pod.
type Volume struct {
// Required: This must be a DNS_LABEL. Each volume in a pod must have
// a unique name.
Name string `json:"name"`
// The VolumeSource represents the location and type of a volume to mount.
// This is optional for now. If not specified, the Volume is implied to be an EmptyDir.
// This implied behavior is deprecated and will be removed in a future version.
VolumeSource `json:",inline,omitempty"`
}
// VolumeSource represents the source location of a volume to mount.
// Only one of its members may be specified.
type VolumeSource struct {
// HostPath represents file or directory on the host machine that is
// directly exposed to the container. This is generally used for system
// agents or other privileged things that are allowed to see the host
// machine. Most containers will NOT need this.
// ---
// TODO(jonesdl) We need to restrict who can use host directory mounts and who can/can not
// mount host directories as read/write.
HostPath *HostPathVolumeSource `json:"hostPath,omitempty"`
// EmptyDir represents a temporary directory that shares a pod's lifetime.
EmptyDir *EmptyDirVolumeSource `json:"emptyDir,omitempty"`
// GCEPersistentDisk represents a GCE Disk resource that is attached to a
// kubelet's host machine and then exposed to the pod.
GCEPersistentDisk *GCEPersistentDiskVolumeSource `json:"gcePersistentDisk,omitempty"`
// AWSElasticBlockStore represents an AWS EBS disk that is attached to a
// kubelet's host machine and then exposed to the pod.
AWSElasticBlockStore *AWSElasticBlockStoreVolumeSource `json:"awsElasticBlockStore,omitempty"`
// GitRepo represents a git repository at a particular revision.
GitRepo *GitRepoVolumeSource `json:"gitRepo,omitempty"`
// Secret represents a secret that should populate this volume.
Secret *SecretVolumeSource `json:"secret,omitempty"`
// NFS represents an NFS mount on the host that shares a pod's lifetime
NFS *NFSVolumeSource `json:"nfs,omitempty"`
// ISCSIVolumeSource represents an ISCSI Disk resource that is attached to a
// kubelet's host machine and then exposed to the pod.
ISCSI *ISCSIVolumeSource `json:"iscsi,omitempty"`
// Glusterfs represents a Glusterfs mount on the host that shares a pod's lifetime
Glusterfs *GlusterfsVolumeSource `json:"glusterfs,omitempty"`
// PersistentVolumeClaimVolumeSource represents a reference to a PersistentVolumeClaim in the same namespace
PersistentVolumeClaim *PersistentVolumeClaimVolumeSource `json:"persistentVolumeClaim,omitempty"`
// RBD represents a Rados Block Device mount on the host that shares a pod's lifetime
RBD *RBDVolumeSource `json:"rbd,omitempty"`
// Cinder represents a cinder volume attached and mounted on kubelets host machine
Cinder *CinderVolumeSource `json:"cinder,omitempty"`
// CephFS represents a Cephfs mount on the host that shares a pod's lifetime
CephFS *CephFSVolumeSource `json:"cephfs,omitempty"`
// DownwardAPI represents metadata about the pod that should populate this volume
DownwardAPI *DownwardAPIVolumeSource `json:"downwardAPI,omitempty"`
// FC represents a Fibre Channel resource that is attached to a kubelet's host machine and then exposed to the pod.
FC *FCVolumeSource `json:"fc,omitempty"`
}
// Similar to VolumeSource but meant for the administrator who creates PVs.
// Exactly one of its members must be set.
type PersistentVolumeSource struct {
// GCEPersistentDisk represents a GCE Disk resource that is attached to a
// kubelet's host machine and then exposed to the pod.
GCEPersistentDisk *GCEPersistentDiskVolumeSource `json:"gcePersistentDisk,omitempty"`
// AWSElasticBlockStore represents an AWS EBS disk that is attached to a
// kubelet's host machine and then exposed to the pod.
AWSElasticBlockStore *AWSElasticBlockStoreVolumeSource `json:"awsElasticBlockStore,omitempty"`
// HostPath represents a directory on the host.
// Provisioned by a developer or tester.
// This is useful for single-node development and testing only!
// On-host storage is not supported in any way and WILL NOT WORK in a multi-node cluster.
HostPath *HostPathVolumeSource `json:"hostPath,omitempty"`
// Glusterfs represents a Glusterfs volume that is attached to a host and exposed to the pod
Glusterfs *GlusterfsVolumeSource `json:"glusterfs,omitempty"`
// NFS represents an NFS mount on the host that shares a pod's lifetime
NFS *NFSVolumeSource `json:"nfs,omitempty"`
// RBD represents a Rados Block Device mount on the host that shares a pod's lifetime
RBD *RBDVolumeSource `json:"rbd,omitempty"`
// ISCSIVolumeSource represents an ISCSI resource that is attached to a
// kubelet's host machine and then exposed to the pod.
ISCSI *ISCSIVolumeSource `json:"iscsi,omitempty"`
// Cinder represents a cinder volume attached and mounted on kubelets host machine
Cinder *CinderVolumeSource `json:"cinder,omitempty"`
// CephFS represents a Ceph FS mount on the host that shares a pod's lifetime
CephFS *CephFSVolumeSource `json:"cephfs,omitempty"`
// FC represents a Fibre Channel resource that is attached to a kubelet's host machine and then exposed to the pod.
FC *FCVolumeSource `json:"fc,omitempty"`
}
type PersistentVolumeClaimVolumeSource struct {
// ClaimName is the name of a PersistentVolumeClaim in the same namespace as the pod using this volume
ClaimName string `json:"claimName"`
// Optional: Defaults to false (read/write). ReadOnly here
// will force the ReadOnly setting in VolumeMounts
ReadOnly bool `json:"readOnly,omitempty"`
}
type PersistentVolume struct {
unversioned.TypeMeta `json:",inline"`
ObjectMeta `json:"metadata,omitempty"`
//Spec defines a persistent volume owned by the cluster
Spec PersistentVolumeSpec `json:"spec,omitempty"`
// Status represents the current information about persistent volume.
Status PersistentVolumeStatus `json:"status,omitempty"`
}
type PersistentVolumeSpec struct {
// Resources represents the actual resources of the volume
Capacity ResourceList `json:"capacity"`
// Source represents the location and type of a volume to mount.
PersistentVolumeSource `json:",inline"`
// AccessModes contains all ways the volume can be mounted
AccessModes []PersistentVolumeAccessMode `json:"accessModes,omitempty"`
// ClaimRef is part of a bi-directional binding between PersistentVolume and PersistentVolumeClaim.
// ClaimRef is expected to be non-nil when bound.
// claim.VolumeName is the authoritative bind between PV and PVC.
ClaimRef *ObjectReference `json:"claimRef,omitempty"`
// Optional: what happens to a persistent volume when released from its claim.
PersistentVolumeReclaimPolicy PersistentVolumeReclaimPolicy `json:"persistentVolumeReclaimPolicy,omitempty"`
}
// PersistentVolumeReclaimPolicy describes a policy for end-of-life maintenance of persistent volumes
type PersistentVolumeReclaimPolicy string
const (
// PersistentVolumeReclaimRecycle means the volume will be recycled back into the pool of unbound persistent volumes on release from its claim.
// The volume plugin must support Recycling.
PersistentVolumeReclaimRecycle PersistentVolumeReclaimPolicy = "Recycle"
// PersistentVolumeReclaimDelete means the volume will be deleted from Kubernetes on release from its claim.
// The volume plugin must support Deletion.
PersistentVolumeReclaimDelete PersistentVolumeReclaimPolicy = "Delete"
// PersistentVolumeReclaimRetain means the volume will left in its current phase (Released) for manual reclamation by the administrator.
// The default policy is Retain.
PersistentVolumeReclaimRetain PersistentVolumeReclaimPolicy = "Retain"
)
type PersistentVolumeStatus struct {
// Phase indicates if a volume is available, bound to a claim, or released by a claim
Phase PersistentVolumePhase `json:"phase,omitempty"`
// A human-readable message indicating details about why the volume is in this state.
Message string `json:"message,omitempty"`
// Reason is a brief CamelCase string that describes any failure and is meant for machine parsing and tidy display in the CLI
Reason string `json:"reason,omitempty"`
}
type PersistentVolumeList struct {
unversioned.TypeMeta `json:",inline"`
unversioned.ListMeta `json:"metadata,omitempty"`
Items []PersistentVolume `json:"items"`
}
// PersistentVolumeClaim is a user's request for and claim to a persistent volume
type PersistentVolumeClaim struct {
unversioned.TypeMeta `json:",inline"`
ObjectMeta `json:"metadata,omitempty"`
// Spec defines the volume requested by a pod author
Spec PersistentVolumeClaimSpec `json:"spec,omitempty"`
// Status represents the current information about a claim
Status PersistentVolumeClaimStatus `json:"status,omitempty"`
}
type PersistentVolumeClaimList struct {
unversioned.TypeMeta `json:",inline"`
unversioned.ListMeta `json:"metadata,omitempty"`
Items []PersistentVolumeClaim `json:"items"`
}
// PersistentVolumeClaimSpec describes the common attributes of storage devices
// and allows a Source for provider-specific attributes
type PersistentVolumeClaimSpec struct {
// Contains the types of access modes required
AccessModes []PersistentVolumeAccessMode `json:"accessModes,omitempty"`
// Resources represents the minimum resources required
Resources ResourceRequirements `json:"resources,omitempty"`
// VolumeName is the binding reference to the PersistentVolume backing this claim
VolumeName string `json:"volumeName,omitempty"`
}
type PersistentVolumeClaimStatus struct {
// Phase represents the current phase of PersistentVolumeClaim
Phase PersistentVolumeClaimPhase `json:"phase,omitempty"`
// AccessModes contains all ways the volume backing the PVC can be mounted
AccessModes []PersistentVolumeAccessMode `json:"accessModes,omitempty"`
// Represents the actual resources of the underlying volume
Capacity ResourceList `json:"capacity,omitempty"`
}
type PersistentVolumeAccessMode string
const (
// can be mounted read/write mode to exactly 1 host
ReadWriteOnce PersistentVolumeAccessMode = "ReadWriteOnce"
// can be mounted in read-only mode to many hosts
ReadOnlyMany PersistentVolumeAccessMode = "ReadOnlyMany"
// can be mounted in read/write mode to many hosts
ReadWriteMany PersistentVolumeAccessMode = "ReadWriteMany"
)
type PersistentVolumePhase string
const (
// used for PersistentVolumes that are not available
VolumePending PersistentVolumePhase = "Pending"
// used for PersistentVolumes that are not yet bound
// Available volumes are held by the binder and matched to PersistentVolumeClaims
VolumeAvailable PersistentVolumePhase = "Available"
// used for PersistentVolumes that are bound
VolumeBound PersistentVolumePhase = "Bound"
// used for PersistentVolumes where the bound PersistentVolumeClaim was deleted
// released volumes must be recycled before becoming available again
// this phase is used by the persistent volume claim binder to signal to another process to reclaim the resource
VolumeReleased PersistentVolumePhase = "Released"
// used for PersistentVolumes that failed to be correctly recycled or deleted after being released from a claim
VolumeFailed PersistentVolumePhase = "Failed"
)
type PersistentVolumeClaimPhase string
const (
// used for PersistentVolumeClaims that are not yet bound
ClaimPending PersistentVolumeClaimPhase = "Pending"
// used for PersistentVolumeClaims that are bound
ClaimBound PersistentVolumeClaimPhase = "Bound"
)
// HostPathVolumeSource represents a host directory mapped into a pod.
type HostPathVolumeSource struct {
Path string `json:"path"`
}
// EmptyDirVolumeSource represents an empty directory for a pod.
type EmptyDirVolumeSource struct {
// TODO: Longer term we want to represent the selection of underlying
// media more like a scheduling problem - user says what traits they
// need, we give them a backing store that satisifies that. For now
// this will cover the most common needs.
// Optional: what type of storage medium should back this directory.
// The default is "" which means to use the node's default medium.
Medium StorageMedium `json:"medium"`
}
// StorageMedium defines ways that storage can be allocated to a volume.
type StorageMedium string
const (
StorageMediumDefault StorageMedium = "" // use whatever the default is for the node
StorageMediumMemory StorageMedium = "Memory" // use memory (tmpfs)
)
// Protocol defines network protocols supported for things like conatiner ports.
type Protocol string
const (
// ProtocolTCP is the TCP protocol.
ProtocolTCP Protocol = "TCP"
// ProtocolUDP is the UDP protocol.
ProtocolUDP Protocol = "UDP"
)
// GCEPersistentDiskVolumeSource represents a Persistent Disk resource in Google Compute Engine.
//
// A GCE PD must exist and be formatted before mounting to a container.
// The disk must also be in the same GCE project and zone as the kubelet.
// A GCE PD can only be mounted as read/write once.
type GCEPersistentDiskVolumeSource struct {
// Unique name of the PD resource. Used to identify the disk in GCE
PDName string `json:"pdName"`
// Required: Filesystem type to mount.
// Must be a filesystem type supported by the host operating system.
// Ex. "ext4", "xfs", "ntfs"
// TODO: how do we prevent errors in the filesystem from compromising the machine
FSType string `json:"fsType,omitempty"`
// Optional: Partition on the disk to mount.
// If omitted, kubelet will attempt to mount the device name.
// Ex. For /dev/sda1, this field is "1", for /dev/sda, this field is 0 or empty.
Partition int `json:"partition,omitempty"`
// Optional: Defaults to false (read/write). ReadOnly here will force
// the ReadOnly setting in VolumeMounts.
ReadOnly bool `json:"readOnly,omitempty"`
}
// A ISCSI Disk can only be mounted as read/write once.
type ISCSIVolumeSource struct {
// Required: iSCSI target portal
// the portal is either an IP or ip_addr:port if port is other than default (typically TCP ports 860 and 3260)
TargetPortal string `json:"targetPortal,omitempty"`
// Required: target iSCSI Qualified Name
IQN string `json:"iqn,omitempty"`
// Required: iSCSI target lun number
Lun int `json:"lun,omitempty"`
// Required: Filesystem type to mount.
// Must be a filesystem type supported by the host operating system.
// Ex. "ext4", "xfs", "ntfs"
// TODO: how do we prevent errors in the filesystem from compromising the machine
FSType string `json:"fsType,omitempty"`
// Optional: Defaults to false (read/write). ReadOnly here will force
// the ReadOnly setting in VolumeMounts.
ReadOnly bool `json:"readOnly,omitempty"`
}
// A Fibre Channel Disk can only be mounted as read/write once.
type FCVolumeSource struct {
// Required: FC target world wide names (WWNs)
TargetWWNs []string `json:"targetWWNs"`
// Required: FC target lun number
Lun *int `json:"lun"`
// Required: Filesystem type to mount.
// Must be a filesystem type supported by the host operating system.
// Ex. "ext4", "xfs", "ntfs"
// TODO: how do we prevent errors in the filesystem from compromising the machine
FSType string `json:"fsType"`
// Optional: Defaults to false (read/write). ReadOnly here will force
// the ReadOnly setting in VolumeMounts.
ReadOnly bool `json:"readOnly,omitempty"`
}
// AWSElasticBlockStoreVolumeSource represents a Persistent Disk resource in AWS.
//
// An AWS EBS disk must exist and be formatted before mounting to a container.
// The disk must also be in the same AWS zone as the kubelet.
// A AWS EBS disk can only be mounted as read/write once.
type AWSElasticBlockStoreVolumeSource struct {
// Unique id of the persistent disk resource. Used to identify the disk in AWS
VolumeID string `json:"volumeID"`
// Required: Filesystem type to mount.
// Must be a filesystem type supported by the host operating system.
// Ex. "ext4", "xfs", "ntfs"
// TODO: how do we prevent errors in the filesystem from compromising the machine
FSType string `json:"fsType,omitempty"`
// Optional: Partition on the disk to mount.
// If omitted, kubelet will attempt to mount the device name.
// Ex. For /dev/sda1, this field is "1", for /dev/sda, this field is 0 or empty.
Partition int `json:"partition,omitempty"`
// Optional: Defaults to false (read/write). ReadOnly here will force
// the ReadOnly setting in VolumeMounts.
ReadOnly bool `json:"readOnly,omitempty"`
}
// GitRepoVolumeSource represents a volume that is pulled from git when the pod is created.
type GitRepoVolumeSource struct {
// Repository URL
Repository string `json:"repository"`
// Commit hash, this is optional
Revision string `json:"revision"`
// TODO: Consider credentials here.
}
// SecretVolumeSource adapts a Secret into a VolumeSource.
//
// The contents of the target Secret's Data field will be presented in a volume
// as files using the keys in the Data field as the file names.
type SecretVolumeSource struct {
// Name of the secret in the pod's namespace to use
SecretName string `json:"secretName"`
}
// NFSVolumeSource represents an NFS Mount that lasts the lifetime of a pod
type NFSVolumeSource struct {
// Server is the hostname or IP address of the NFS server
Server string `json:"server"`
// Path is the exported NFS share
Path string `json:"path"`
// Optional: Defaults to false (read/write). ReadOnly here will force
// the NFS export to be mounted with read-only permissions
ReadOnly bool `json:"readOnly,omitempty"`
}
// GlusterfsVolumeSource represents a Glusterfs Mount that lasts the lifetime of a pod
type GlusterfsVolumeSource struct {
// Required: EndpointsName is the endpoint name that details Glusterfs topology
EndpointsName string `json:"endpoints"`
// Required: Path is the Glusterfs volume path
Path string `json:"path"`
// Optional: Defaults to false (read/write). ReadOnly here will force
// the Glusterfs to be mounted with read-only permissions
ReadOnly bool `json:"readOnly,omitempty"`
}
// RBDVolumeSource represents a Rados Block Device Mount that lasts the lifetime of a pod
type RBDVolumeSource struct {
// Required: CephMonitors is a collection of Ceph monitors
CephMonitors []string `json:"monitors"`
// Required: RBDImage is the rados image name
RBDImage string `json:"image"`
// Required: Filesystem type to mount.
// Must be a filesystem type supported by the host operating system.
// Ex. "ext4", "xfs", "ntfs"
// TODO: how do we prevent errors in the filesystem from compromising the machine
FSType string `json:"fsType,omitempty"`
// Optional: RadosPool is the rados pool name,default is rbd
RBDPool string `json:"pool"`
// Optional: RBDUser is the rados user name, default is admin
RadosUser string `json:"user"`
// Optional: Keyring is the path to key ring for RBDUser, default is /etc/ceph/keyring
Keyring string `json:"keyring"`
// Optional: SecretRef is name of the authentication secret for RBDUser, default is empty.
SecretRef *LocalObjectReference `json:"secretRef"`
// Optional: Defaults to false (read/write). ReadOnly here will force
// the ReadOnly setting in VolumeMounts.
ReadOnly bool `json:"readOnly,omitempty"`
}
// CinderVolumeSource represents a cinder volume resource in Openstack.
// A Cinder volume must exist and be formatted before mounting to a container.
// The volume must also be in the same region as the kubelet.
type CinderVolumeSource struct {
// Unique id of the volume used to identify the cinder volume
VolumeID string `json:"volumeID"`
// Required: Filesystem type to mount.
// Must be a filesystem type supported by the host operating system.
// Only ext3 and ext4 are allowed
FSType string `json:"fsType,omitempty"`
// Optional: Defaults to false (read/write). ReadOnly here will force
// the ReadOnly setting in VolumeMounts.
ReadOnly bool `json:"readOnly,omitempty"`
}
// CephFSVolumeSource represents a Ceph Filesystem Mount that lasts the lifetime of a pod
type CephFSVolumeSource struct {
// Required: Monitors is a collection of Ceph monitors
Monitors []string `json:"monitors"`
// Optional: User is the rados user name, default is admin
User string `json:"user,omitempty"`
// Optional: SecretFile is the path to key ring for User, default is /etc/ceph/user.secret
SecretFile string `json:"secretFile,omitempty"`
// Optional: SecretRef is reference to the authentication secret for User, default is empty.
SecretRef *LocalObjectReference `json:"secretRef,omitempty"`
// Optional: Defaults to false (read/write). ReadOnly here will force
// the ReadOnly setting in VolumeMounts.
ReadOnly bool `json:"readOnly,omitempty"`
}
// DownwardAPIVolumeSource represents a volume containing downward API info
type DownwardAPIVolumeSource struct {
// Items is a list of DownwardAPIVolume file
Items []DownwardAPIVolumeFile `json:"items,omitempty"`
}
// DownwardAPIVolumeFile represents a single file containing information from the downward API
type DownwardAPIVolumeFile struct {
// Required: Path is the relative path name of the file to be created. Must not be absolute or contain the '..' path. Must be utf-8 encoded. The first item of the relative path must not start with '..'
Path string `json:"path"`
// Required: Selects a field of the pod: only annotations, labels, name and namespace are supported.
FieldRef ObjectFieldSelector `json:"fieldRef"`
}
// ContainerPort represents a network port in a single container
type ContainerPort struct {
// Optional: If specified, this must be an IANA_SVC_NAME Each named port
// in a pod must have a unique name.
Name string `json:"name,omitempty"`
// Optional: If specified, this must be a valid port number, 0 < x < 65536.
// If HostNetwork is specified, this must match ContainerPort.
HostPort int `json:"hostPort,omitempty"`
// Required: This must be a valid port number, 0 < x < 65536.
ContainerPort int `json:"containerPort"`
// Required: Supports "TCP" and "UDP".
Protocol Protocol `json:"protocol,omitempty"`
// Optional: What host IP to bind the external port to.
HostIP string `json:"hostIP,omitempty"`
}
// VolumeMount describes a mounting of a Volume within a container.
type VolumeMount struct {
// Required: This must match the Name of a Volume [above].
Name string `json:"name"`
// Optional: Defaults to false (read-write).
ReadOnly bool `json:"readOnly,omitempty"`
// Required.
MountPath string `json:"mountPath"`
}
// EnvVar represents an environment variable present in a Container.
type EnvVar struct {
// Required: This must be a C_IDENTIFIER.
Name string `json:"name"`
// Optional: no more than one of the following may be specified.
// Optional: Defaults to ""; variable references $(VAR_NAME) are expanded
// using the previous defined environment variables in the container and
// any service environment variables. If a variable cannot be resolved,
// the reference in the input string will be unchanged. The $(VAR_NAME)
// syntax can be escaped with a double $$, ie: $$(VAR_NAME). Escaped
// references will never be expanded, regardless of whether the variable
// exists or not.
Value string `json:"value,omitempty"`
// Optional: Specifies a source the value of this var should come from.
ValueFrom *EnvVarSource `json:"valueFrom,omitempty"`
}
// EnvVarSource represents a source for the value of an EnvVar.
type EnvVarSource struct {
// Required: Selects a field of the pod; only name and namespace are supported.
FieldRef *ObjectFieldSelector `json:"fieldRef"`
}
// ObjectFieldSelector selects an APIVersioned field of an object.
type ObjectFieldSelector struct {
// Required: Version of the schema the FieldPath is written in terms of.
// If no value is specified, it will be defaulted to the APIVersion of the
// enclosing object.
APIVersion string `json:"apiVersion"`
// Required: Path of the field to select in the specified API version
FieldPath string `json:"fieldPath"`
}
// HTTPGetAction describes an action based on HTTP Get requests.
type HTTPGetAction struct {
// Optional: Path to access on the HTTP server.
Path string `json:"path,omitempty"`
// Required: Name or number of the port to access on the container.
Port util.IntOrString `json:"port,omitempty"`
// Optional: Host name to connect to, defaults to the pod IP.
Host string `json:"host,omitempty"`
// Optional: Scheme to use for connecting to the host, defaults to HTTP.
Scheme URIScheme `json:"scheme,omitempty"`
}
// URIScheme identifies the scheme used for connection to a host for Get actions
type URIScheme string
const (
// URISchemeHTTP means that the scheme used will be http://
URISchemeHTTP URIScheme = "HTTP"
// URISchemeHTTPS means that the scheme used will be https://
URISchemeHTTPS URIScheme = "HTTPS"
)
// TCPSocketAction describes an action based on opening a socket
type TCPSocketAction struct {
// Required: Port to connect to.
Port util.IntOrString `json:"port,omitempty"`
}
// ExecAction describes a "run in container" action.
type ExecAction struct {
// Command is the command line to execute inside the container, the working directory for the
// command is root ('/') in the container's filesystem. The command is simply exec'd, it is
// not run inside a shell, so traditional shell instructions ('|', etc) won't work. To use
// a shell, you need to explicitly call out to that shell.
Command []string `json:"command,omitempty"`
}
// Probe describes a liveness probe to be examined to the container.
type Probe struct {
// The action taken to determine the health of a container
Handler `json:",inline"`
// Length of time before health checking is activated. In seconds.
InitialDelaySeconds int64 `json:"initialDelaySeconds,omitempty"`
// Length of time before health checking times out. In seconds.
TimeoutSeconds int64 `json:"timeoutSeconds,omitempty"`
}
// PullPolicy describes a policy for if/when to pull a container image
type PullPolicy string
const (
// PullAlways means that kubelet always attempts to pull the latest image. Container will fail If the pull fails.
PullAlways PullPolicy = "Always"
// PullNever means that kubelet never pulls an image, but only uses a local image. Container will fail if the image isn't present
PullNever PullPolicy = "Never"
// PullIfNotPresent means that kubelet pulls if the image isn't present on disk. Container will fail if the image isn't present and the pull fails.
PullIfNotPresent PullPolicy = "IfNotPresent"
)
// Capability represent POSIX capabilities type
type Capability string
// Capabilities represent POSIX capabilities that can be added or removed to a running container.
type Capabilities struct {
// Added capabilities
Add []Capability `json:"add,omitempty"`
// Removed capabilities
Drop []Capability `json:"drop,omitempty"`
}
// ResourceRequirements describes the compute resource requirements.
type ResourceRequirements struct {
// Limits describes the maximum amount of compute resources allowed.
Limits ResourceList `json:"limits,omitempty"`
// Requests describes 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
Requests ResourceList `json:"requests,omitempty"`
}
// Container represents a single container that is expected to be run on the host.
type Container struct {
// Required: This must be a DNS_LABEL. Each container in a pod must
// have a unique name.
Name string `json:"name"`
// Required.
Image string `json:"image"`
// Optional: The docker image's entrypoint is used if this is not provided; cannot be updated.
// Variable references $(VAR_NAME) are expanded using the container's environment. If a variable
// cannot be resolved, the reference in the input string will be unchanged. The $(VAR_NAME) syntax
// can be escaped with a double $$, ie: $$(VAR_NAME). Escaped references will never be expanded,
// regardless of whether the variable exists or not.
Command []string `json:"command,omitempty"`
// Optional: The docker image's cmd is used if this is not provided; cannot be updated.
// Variable references $(VAR_NAME) are expanded using the container's environment. If a variable
// cannot be resolved, the reference in the input string will be unchanged. The $(VAR_NAME) syntax
// can be escaped with a double $$, ie: $$(VAR_NAME). Escaped references will never be expanded,
// regardless of whether the variable exists or not.
Args []string `json:"args,omitempty"`
// Optional: Defaults to Docker's default.
WorkingDir string `json:"workingDir,omitempty"`
Ports []ContainerPort `json:"ports,omitempty"`
Env []EnvVar `json:"env,omitempty"`
// Compute resource requirements.
Resources ResourceRequirements `json:"resources,omitempty"`
VolumeMounts []VolumeMount `json:"volumeMounts,omitempty"`
LivenessProbe *Probe `json:"livenessProbe,omitempty"`
ReadinessProbe *Probe `json:"readinessProbe,omitempty"`
Lifecycle *Lifecycle `json:"lifecycle,omitempty"`
// Required.
TerminationMessagePath string `json:"terminationMessagePath,omitempty"`
// Required: Policy for pulling images for this container
ImagePullPolicy PullPolicy `json:"imagePullPolicy"`
// Optional: SecurityContext defines the security options the pod should be run with
SecurityContext *SecurityContext `json:"securityContext,omitempty"`
// Variables for interactive containers, these have very specialized use-cases (e.g. debugging)
// and shouldn't be used for general purpose containers.
Stdin bool `json:"stdin,omitempty"`
TTY bool `json:"tty,omitempty"`
}
// Handler defines a specific action that should be taken
// TODO: pass structured data to these actions, and document that data here.
type Handler struct {
// One and only one of the following should be specified.
// Exec specifies the action to take.
Exec *ExecAction `json:"exec,omitempty"`
// HTTPGet specifies the http request to perform.
HTTPGet *HTTPGetAction `json:"httpGet,omitempty"`
// TCPSocket specifies an action involving a TCP port.
// TODO: implement a realistic TCP lifecycle hook
TCPSocket *TCPSocketAction `json:"tcpSocket,omitempty"`
}
// Lifecycle describes actions that the management system should take in response to container lifecycle
// events. For the PostStart and PreStop lifecycle handlers, management of the container blocks
// until the action is complete, unless the container process fails, in which case the handler is aborted.
type Lifecycle struct {
// PostStart is called immediately after a container is created. If the handler fails, the container
// is terminated and restarted.
PostStart *Handler `json:"postStart,omitempty"`
// PreStop is called immediately before a container is terminated. The reason for termination is
// passed to the handler. Regardless of the outcome of the handler, the container is eventually terminated.
PreStop *Handler `json:"preStop,omitempty"`
}
// The below types are used by kube_client and api_server.
type ConditionStatus string
// These are valid condition statuses. "ConditionTrue" means a resource is in the condition;
// "ConditionFalse" means a resource is not in the condition; "ConditionUnknown" means kubernetes
// can't decide if a resource is in the condition or not. In the future, we could add other
// intermediate conditions, e.g. ConditionDegraded.
const (
ConditionTrue ConditionStatus = "True"
ConditionFalse ConditionStatus = "False"
ConditionUnknown ConditionStatus = "Unknown"
)
type ContainerStateWaiting struct {
// A brief CamelCase string indicating details about why the container is in waiting state.
Reason string `json:"reason,omitempty"`
// A human-readable message indicating details about why the container is in waiting state.
Message string `json:"message,omitempty"`
}
type ContainerStateRunning struct {
StartedAt unversioned.Time `json:"startedAt,omitempty"`
}
type ContainerStateTerminated struct {
ExitCode int `json:"exitCode"`
Signal int `json:"signal,omitempty"`
Reason string `json:"reason,omitempty"`
Message string `json:"message,omitempty"`
StartedAt unversioned.Time `json:"startedAt,omitempty"`
FinishedAt unversioned.Time `json:"finishedAt,omitempty"`
ContainerID string `json:"containerID,omitempty"`
}
// ContainerState holds a possible state of container.
// Only one of its members may be specified.
// If none of them is specified, the default one is ContainerStateWaiting.
type ContainerState struct {
Waiting *ContainerStateWaiting `json:"waiting,omitempty"`
Running *ContainerStateRunning `json:"running,omitempty"`
Terminated *ContainerStateTerminated `json:"terminated,omitempty"`
}
type ContainerStatus struct {
// Each container in a pod must have a unique name.
Name string `json:"name"`
State ContainerState `json:"state,omitempty"`
LastTerminationState ContainerState `json:"lastState,omitempty"`
// Ready specifies whether the conatiner has passed its readiness check.
Ready bool `json:"ready"`
// Note that this is calculated from dead containers. But those containers are subject to
// garbage collection. This value will get capped at 5 by GC.
RestartCount int `json:"restartCount"`
Image string `json:"image"`
ImageID string `json:"imageID"`
ContainerID string `json:"containerID,omitempty"`
}
// PodPhase is a label for the condition of a pod at the current time.
type PodPhase string
// These are the valid statuses of pods.
const (
// PodPending means the pod has been accepted by the system, but one or more of the containers
// has not been started. This includes time before being bound to a node, as well as time spent
// pulling images onto the host.
PodPending PodPhase = "Pending"
// PodRunning means the pod has been bound to a node and all of the containers have been started.
// At least one container is still running or is in the process of being restarted.
PodRunning PodPhase = "Running"
// PodSucceeded means that all containers in the pod have voluntarily terminated
// with a container exit code of 0, and the system is not going to restart any of these containers.
PodSucceeded PodPhase = "Succeeded"
// PodFailed means that all containers in the pod have terminated, and at least one container has
// terminated in a failure (exited with a non-zero exit code or was stopped by the system).
PodFailed PodPhase = "Failed"
// PodUnknown means that for some reason the state of the pod could not be obtained, typically due
// to an error in communicating with the host of the pod.
PodUnknown PodPhase = "Unknown"
)
type PodConditionType string
// These are valid conditions of pod.
const (
// PodReady means the pod is able to service requests and should be added to the
// load balancing pools of all matching services.
PodReady PodConditionType = "Ready"
)
type PodCondition struct {
Type PodConditionType `json:"type"`
Status ConditionStatus `json:"status"`
LastProbeTime unversioned.Time `json:"lastProbeTime,omitempty"`
LastTransitionTime unversioned.Time `json:"lastTransitionTime,omitempty"`
Reason string `json:"reason,omitempty"`
Message string `json:"message,omitempty"`
}
// RestartPolicy describes how the container should be restarted.
// Only one of the following restart policies may be specified.
// If none of the following policies is specified, the default one
// is RestartPolicyAlways.
type RestartPolicy string
const (
RestartPolicyAlways RestartPolicy = "Always"
RestartPolicyOnFailure RestartPolicy = "OnFailure"
RestartPolicyNever RestartPolicy = "Never"
)
// PodList is a list of Pods.
type PodList struct {
unversioned.TypeMeta `json:",inline"`
unversioned.ListMeta `json:"metadata,omitempty"`
Items []Pod `json:"items"`
}
// DNSPolicy defines how a pod's DNS will be configured.
type DNSPolicy string
const (
// DNSClusterFirst indicates that the pod should use cluster DNS
// first, if it is available, then fall back on the default (as
// determined by kubelet) DNS settings.
DNSClusterFirst DNSPolicy = "ClusterFirst"
// DNSDefault indicates that the pod should use the default (as
// determined by kubelet) DNS settings.
DNSDefault DNSPolicy = "Default"
)
// PodSpec is a description of a pod
type PodSpec struct {
Volumes []Volume `json:"volumes"`
// Required: there must be at least one container in a pod.
Containers []Container `json:"containers"`
RestartPolicy RestartPolicy `json:"restartPolicy,omitempty"`
// Optional duration in seconds the pod needs to terminate gracefully. May be decreased in delete request.
// Value must be non-negative integer. The value zero indicates delete immediately.
// If this value is nil, the default grace period will be used instead.
// The grace period is the duration in seconds after the processes running in the pod are sent
// a termination signal and the time when the processes are forcibly halted with a kill signal.
// Set this value longer than the expected cleanup time for your process.
TerminationGracePeriodSeconds *int64 `json:"terminationGracePeriodSeconds,omitempty"`
// Optional duration in seconds relative to the StartTime that the pod may be active on a node
// before the system actively tries to terminate the pod; value must be positive integer
ActiveDeadlineSeconds *int64 `json:"activeDeadlineSeconds,omitempty"`
// Required: Set DNS policy.
DNSPolicy DNSPolicy `json:"dnsPolicy,omitempty"`
// NodeSelector is a selector which must be true for the pod to fit on a node
NodeSelector map[string]string `json:"nodeSelector,omitempty"`
// ServiceAccountName is the name of the ServiceAccount to use to run this pod
// The pod will be allowed to use secrets referenced by the ServiceAccount
ServiceAccountName string `json:"serviceAccountName"`
// NodeName is a request to schedule this pod onto a specific node. If it is non-empty,
// the scheduler simply schedules this pod onto that node, assuming that it fits resource
// requirements.
NodeName string `json:"nodeName,omitempty"`
// Use the host's network namespace. If this option is set, the ports that will be
// used must be specified.
// Optional: Default to false.
HostNetwork bool `json:"hostNetwork,omitempty"`
// Use the host's pid namespace.
// Optional: Default to false.
HostPID bool `json:"hostPID,omitempty"`
// Use the host's ipc namespace.
// Optional: Default to false.
HostIPC bool `json:"hostIPC,omitempty"`
// ImagePullSecrets is an optional list of references to secrets in the same namespace to use for pulling any of the images used by this PodSpec.
// If specified, these secrets will be passed to individual puller implementations for them to use. For example,
// in the case of docker, only DockerConfig type secrets are honored.
ImagePullSecrets []LocalObjectReference `json:"imagePullSecrets,omitempty"`
}
// PodStatus represents information about the status of a pod. Status may trail the actual
// state of a system.
type PodStatus struct {
Phase PodPhase `json:"phase,omitempty"`
Conditions []PodCondition `json:"conditions,omitempty"`
// A human readable message indicating details about why the pod is in this state.
Message string `json:"message,omitempty"`