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 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. After
 that 30 seconds, the Kubelet will send a hard termination signal (SIGKILL)
 to the container and after cleanup, remove the pod from the API. In the
 presence of network partitions, this object may still exist after this
 timestamp, until an administrator or automated process can determine the
 resource is fully terminated. If not set, graceful deletion of the object
 has not been requested. Populated by the system when a graceful deletion is
 requested. Read-only. More info:
 https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata

finalizers <[]string>
Must be empty before the object is deleted from the registry. Each entry is
an identifier for the responsible component that will remove the entry from
the list. If the deletionTimestamp of the object is non-nil, entries in
this list can only be removed. Finalizers may be processed and removed in
any order. Order is NOT enforced because it introduces significant risk of
stuck finalizers. finalizers is a shared field, any actor with permission
can reorder it. If the finalizer list is processed in order, then this can
lead to a situation in which the component responsible for the first
finalizer in the list is waiting for a signal (field value, external
system, or other) produced by a component responsible for a finalizer later
in the list, resulting in a deadlock. Without enforced ordering finalizers
are free to order amongst themselves and are not vulnerable to ordering
changes in the list.

generateName
GenerateName is an optional prefix, used by the server, to generate a
unique name ONLY IF the Name field has not been provided. If this field is
used, the name returned to the client will be different than the name
passed. This value will also be combined with a unique suffix. The provided
value has the same validation rules as the Name field, 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 the generated name exists, the
server will NOT return a 409 - 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). Applied only if Name is not
specified. More info:
https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#idempotency

generation
A sequence number representing a specific generation of the desired state.
Populated by the system. Read-only.

labels <map[string]string>
Map of string keys and values that can be used to organize and categorize
(scope and select) objects. May match selectors of replication controllers
and services. More info: http://kubernetes.io/docs/user-guide/labels

managedFields <[]Object>
ManagedFields maps workflow-id and version to the set of fields that are
managed by that workflow. This is mostly for internal housekeeping, and
users typically shouldn’t need to set or understand this field. A workflow
can be the user’s name, a controller’s name, or the name of a specific
apply path like “ci-cd”. The set of fields is always in the version that
the workflow used when modifying the object.

name
Name must be unique within a namespace. 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. Cannot be updated.
More info: http://kubernetes.io/docs/user-guide/identifiers#names

namespace
Namespace defines the space within each 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. Must
be a DNS_LABEL. Cannot be updated. More info:
http://kubernetes.io/docs/user-guide/namespaces

ownerReferences <[]Object>
List of objects depended by this object. If ALL objects in the list have
been deleted, this object will be garbage collected. If this object is
managed by a controller, then an entry in this list will point to this
controller, with the controller field set to true. There cannot be more
than one managing controller.

resourceVersion
An opaque value that represents the internal version of this object that
can be used by clients to determine when objects have changed. 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
passed unmodified back to the server. They may only be valid for a
particular resource or set of resources. Populated by the system.
Read-only. Value must be treated as opaque by clients and . More info:
https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#concurrency-control-and-consistency

selfLink
SelfLink is a URL representing this object. Populated by the system.
Read-only. DEPRECATED Kubernetes will stop propagating this field in 1.20
release and the field is planned to be removed in 1.21 release.

uid
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. Populated by the system. Read-only.
More info: http://kubernetes.io/docs/user-guide/identifiers#uids

常用的有以下几个：


* annotaions：注解。
* clusterName：集群名称。
* labels：标签。
* name：名称（namespace中唯一）。
* namespace：命名空间（大部分情况下使用kubectl中的-n指定，不写到yaml中）。
* ownerReferences：依赖于这个对象的其他对象。
* uid：唯一字符串。


这里再介绍下常用的label、annotations。


#### labels


**标签（Labels）** 是附加到 Kubernetes 对象（比如 Pods）上的键值对。 标签旨在用于指定对用户有意义且相关的对象的标识属性，但不直接对核心系统有语义含义。 标签可以用于组织和选择对象的子集。标签可以在创建时附加到对象，随后可以随时添加和修改。 每个对象都可以定义一组键/值标签。每个键对于给定对象必须是唯一的。


可以使用-l进行筛选：  
 **命令**

kubectl get po -n killer -l app=nginx

**截图**  
 ![在这里插入图片描述](https://img-blog.csdnimg.cn/4c3d600dc42f4886a47c0dd1d185be1a.png)


#### annotations


你可以使用 Kubernetes 注解（Annotations）为对象附加任意的**非标识的元数据**。客户端程序（例如工具和库）能够获取这些元数据信息。  
 特点如下：


* 一般比label大
* 可以包含特殊字符
* 可以结构化也可以非结构化


### 帮助


如果yaml中的某个关键字不懂，可以使用explain命令进行详细解释。  
 **命令**

kubectl explain pods.spec.containers

**结果**  
 ![在这里插入图片描述](https://img-blog.csdnimg.cn/76b7e8009c1b45f9a7face9201481c40.png)  
 **containers全部内容**

KIND: Pod
VERSION: v1
RESOURCE: containers <[]Object>

DESCRIPTION:
List of containers belonging to the pod. Containers cannot currently be
added or removed. There must be at least one container in a Pod. Cannot be
updated.

 A single application container that you want to run within a pod.

FIELDS:
args <[]string>
Arguments to the entrypoint. The docker image’s CMD is used if this is not
provided. 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. Cannot be
updated. More info:
https://kubernetes.io/docs/tasks/inject-data-application/define-command-argument-container/#running-a-command-in-a-shell

command <[]string>
Entrypoint array. Not executed within a shell. The docker image’s
ENTRYPOINT is used if this is not provided. 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. Cannot be updated. More info:
https://kubernetes.io/docs/tasks/inject-data-application/define-command-argument-container/#running-a-command-in-a-shell

env <[]Object>
List of environment variables to set in the container. Cannot be updated.

envFrom <[]Object>
List of sources to populate environment variables in the container. The
keys defined within a source must be a C_IDENTIFIER. All invalid keys will
be reported as an event when the container is starting. When a key exists
in multiple sources, the value associated with the last source will take
precedence. Values defined by an Env with a duplicate key will take
precedence. Cannot be updated.

image
Docker image name. More info:
https://kubernetes.io/docs/concepts/containers/images This field is
optional to allow higher level config management to default or override
container images in workload controllers like Deployments and StatefulSets.

imagePullPolicy
Image pull policy. One of Always, Never, IfNotPresent. Defaults to Always
if :latest tag is specified, or IfNotPresent otherwise. Cannot be updated.
More info:
https://kubernetes.io/docs/concepts/containers/images#updating-images

lifecycle
Actions that the management system should take in response to container
lifecycle events. Cannot be updated.

livenessProbe
Periodic probe of container liveness. Container will be restarted if the
probe fails. Cannot be updated. More info:
https://kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle#container-probes

name -required-
Name of the container specified as a DNS_LABEL. Each container in a pod
must have a unique name (DNS_LABEL). Cannot be updated.

ports <[]Object>
List of ports to expose from the container. Exposing a port here gives the
system additional information about the network connections a container
uses, but is primarily informational. Not specifying a port here DOES NOT
prevent that port from being exposed. Any port which is listening on the
default “0.0.0.0” address inside a container will be accessible from the
network. Cannot be updated.

readinessProbe
Periodic probe of container service readiness. Container will be removed
from service endpoints if the probe fails. Cannot be updated. More info:
https://kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle#container-probes

resources
Compute Resources required by this container. Cannot be updated. More info:
https://kubernetes.io/docs/concepts/configuration/manage-compute-resources-container/

securityContext
Security options the pod should run with. More info:
https://kubernetes.io/docs/concepts/policy/security-context/ More info:
https://kubernetes.io/docs/tasks/configure-pod-container/security-context/

startupProbe
StartupProbe indicates that the Pod has successfully initialized. If
specified, no other probes are executed until this completes successfully.
If this probe fails, the Pod will be restarted, just as if the
livenessProbe failed. This can be used to provide different probe
parameters at the beginning of a Pod’s lifecycle, when it might take a long
time to load data or warm a cache, than during steady-state operation. This
cannot be updated. This is an alpha feature enabled by the StartupProbe
feature flag. More info:
https://kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle#container-probes

stdin
Whether this container should allocate a buffer for stdin in the container
runtime. If this is not set, reads from stdin in the container will always
result in EOF. Default is false.

stdinOnce
Whether the container runtime should close the stdin channel after it has
been opened by a single attach. When stdin is true the stdin stream will
remain open across multiple attach sessions. If stdinOnce is set to true,
stdin is opened on container start, is empty until the first client
attaches to stdin, and then remains open and accepts data until the client
disconnects, at which time stdin is closed and remains closed until the
container is restarted. If this flag is false, a container processes that
reads from stdin will never receive an EOF. Default is false

terminationMessagePath
Optional: Path at which the file to which the container’s termination
message will be written is mounted into the container’s filesystem. Message
written is intended to be brief final status, such as an assertion failure
message. Will be truncated by the node if greater than 4096 bytes. The
total message length across all containers will be limited to 12kb.
Defaults to /dev/termination-log. Cannot be updated.

terminationMessagePolicy
Indicate how the termination message should be populated. File will use the
contents of terminationMessagePath to populate the container status message
on both success and failure. FallbackToLogsOnError will use the last chunk
of container log output if the termination message file is empty and the
container exited with an error. The log output is limited to 2048 bytes or
80 lines, whichever is smaller. Defaults to File. Cannot be updated.

tty
Whether this container should allocate a TTY for itself, also requires
‘stdin’ to be true. Default is false.

volumeDevices <[]Object>
volumeDevices is the list of block devices to be used by the container.
This is a beta feature.

volumeMounts <[]Object>
Pod volumes to mount into the container’s filesystem. Cannot be updated.

workingDir
Container’s working directory. If not specified, the container runtime’s
default will be used, which might be configured in the container image.
Cannot be updated.

可以看到对前面的yaml中的image、name、ports等做了详细解释。读者可以试试

kubectl explain pods.spec.dnsPolicy

等命令的帮助。


更多k8s相关内容，请看文章：[k8s学习-思维导图与学习笔记](https://bbs.csdn.net/forums/4f45ff00ff254613a03fab5e56a57acb)


## 参考


[k8s-理解k8s对资源象](https://bbs.csdn.net/forums/4f45ff00ff254613a03fab5e56a57acb)  


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