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云原生FAQ
2022-08-01 07:37:00 【yolo2016】
云原生FAQ
Kubernetes
Annotation
Annotation(注解)是另一种附加在对象之上的键值类型的数据，但它拥有更大的数据容量。Annotation常用于将各种非标识型元数据(metadata)附加到对象上，但它不能用于标识和选择对象，通常也不会被Kubernetes直接使用，其主要目的是方便工具或用户的阅读及查找等。
service （服务暴露）
service 为pod提供统一的访问入口并实现负载均衡
ClusterIP、 NodePort、 LoadBalance、 ExternalName
https://kubernetes.io/docs/concepts/services-networking/service/#publishing-services-service-types
Ingress
Kubernetes将Pod对象和外部网络环境进行了隔离, Pod和Service等对象间的通信都使用其内部专用地址进行，如若需要开放某些Pod对象提供给外部用户访问，则需要为其请求流量打开一个通往Kubernetes集群内部的通道,除了Service之外, Ingress也是这类通道的实现方式之一。
Kubernets 集群组件
API Server：负责输出Restful 风格的Kubernetes API，集群网关
etcd:集群状态存储，分布式key-value数据库，有watch监听机制
Controller-manager：控制器管理器，资源生命周期管理，API业务逻辑
Scheduler： 响应资源请求，并调度到合适的工作负载节点
Kubelet:工作节点的守护进程，响应API Server的请求，并定期向master汇报节点的资源使用情况
容器运行时环境： Container Runtime
Kube-Proxy: 为service资源对象生成iptables或ipvs规则，流量转发
CoreDNS：提供DNS服务
Kubernetes Dashboard： web UI
Heapster： 容器和节点的性能监控与分析系统，被prometheus取代
Ingress Controller： Ingress实现HTTP(s)的负载均衡，也就是level 7 lb， services实现的是L4 lb
任意节点使用kubectl
复制 master 上的/etc/kubernetes/admin.conf到相关主机的home下面的.kube/config文件中
Kubernets的资源对象
[[email protected] ~]# kubectl api-resources
NAME SHORTNAMES APIGROUP NAMESPACED KIND
bindings true Binding
componentstatuses cs false ComponentStatus
configmaps cm true ConfigMap
endpoints ep true Endpoints
events ev true Event
limitranges limits true LimitRange
namespaces ns false Namespace
nodes no false Node
persistentvolumeclaims pvc true PersistentVolumeClaim
persistentvolumes pv false PersistentVolume
pods po true Pod
podtemplates true PodTemplate
replicationcontrollers rc true ReplicationController
resourcequotas quota true ResourceQuota
secrets true Secret
serviceaccounts sa true ServiceAccount
services svc true Service
mutatingwebhookconfigurations admissionregistration.k8s.io false MutatingWebhookConfiguration
validatingwebhookconfigurations admissionregistration.k8s.io false ValidatingWebhookConfiguration
customresourcedefinitions crd,crds apiextensions.k8s.io false CustomResourceDefinition
apiservices apiregistration.k8s.io false APIService
aplogconfs appprotect.f5.com true APLogConf
appolicies appprotect.f5.com true APPolicy
apusersigs appprotect.f5.com true APUserSig
controllerrevisions apps true ControllerRevision
daemonsets ds apps true DaemonSet
deployments deploy apps true Deployment
replicasets rs apps true ReplicaSet
statefulsets sts apps true StatefulSet
tokenreviews authentication.k8s.io false TokenReview
localsubjectaccessreviews authorization.k8s.io true LocalSubjectAccessReview
selfsubjectaccessreviews authorization.k8s.io false SelfSubjectAccessReview
selfsubjectrulesreviews authorization.k8s.io false SelfSubjectRulesReview
subjectaccessreviews authorization.k8s.io false SubjectAccessReview
horizontalpodautoscalers hpa autoscaling true HorizontalPodAutoscaler
cronjobs cj batch true CronJob
jobs batch true Job
apps catalog.cattle.io true App
clusterrepos catalog.cattle.io false ClusterRepo
operations catalog.cattle.io true Operation
certificatesigningrequests csr certificates.k8s.io false CertificateSigningRequest
clusterauthtokens cluster.cattle.io true ClusterAuthToken
clusteruserattributes cluster.cattle.io true ClusterUserAttribute
leases coordination.k8s.io true Lease
endpointslices discovery.k8s.io true EndpointSlice
events ev events.k8s.io true Event
ingresses ing extensions true Ingress
globalconfigurations gc k8s.nginx.org true GlobalConfiguration
policies pol k8s.nginx.org true Policy
transportservers ts k8s.nginx.org true TransportServer
virtualserverroutes vsr k8s.nginx.org true VirtualServerRoute
virtualservers vs k8s.nginx.org true VirtualServer
clusters management.cattle.io false Cluster
features management.cattle.io false Feature
preferences management.cattle.io true Preference
settings management.cattle.io false Setting
nodes metrics.k8s.io false NodeMetrics
pods metrics.k8s.io true PodMetrics
alertmanagers monitoring.coreos.com true Alertmanager
prometheuses monitoring.coreos.com true Prometheus
prometheusrules monitoring.coreos.com true PrometheusRule
servicemonitors monitoring.coreos.com true ServiceMonitor
ingressclasses networking.k8s.io false IngressClass
ingresses ing networking.k8s.io true Ingress
networkpolicies netpol networking.k8s.io true NetworkPolicy
runtimeclasses node.k8s.io false RuntimeClass
poddisruptionbudgets pdb policy true PodDisruptionBudget
podsecuritypolicies psp policy false PodSecurityPolicy
clusterrolebindings rbac.authorization.k8s.io false ClusterRoleBinding
clusterroles rbac.authorization.k8s.io false ClusterRole
rolebindings rbac.authorization.k8s.io true RoleBinding
roles rbac.authorization.k8s.io true Role
priorityclasses pc scheduling.k8s.io false PriorityClass
csidrivers storage.k8s.io false CSIDriver
csinodes storage.k8s.io false CSINode
storageclasses sc storage.k8s.io false StorageClass
volumeattachments storage.k8s.io false VolumeAttachment
资源及其在API中的组织形式
资源类型 GROUP/VERSION/RESOURCE
资源路径
/apis/< group>/ < version >/namespaces/< namespace> / < kind-plural>
[[email protected] ~]# kubectl api-versions
admissionregistration.k8s.io/v1
admissionregistration.k8s.io/v1beta1
apiextensions.k8s.io/v1
apiextensions.k8s.io/v1beta1
apiregistration.k8s.io/v1
apiregistration.k8s.io/v1beta1
appprotect.f5.com/v1beta1
apps/v1
authentication.k8s.io/v1
authentication.k8s.io/v1beta1
authorization.k8s.io/v1
authorization.k8s.io/v1beta1
autoscaling/v1
autoscaling/v2beta1
autoscaling/v2beta2
batch/v1
batch/v1beta1
catalog.cattle.io/v1
certificates.k8s.io/v1
certificates.k8s.io/v1beta1
cluster.cattle.io/v3
coordination.k8s.io/v1
coordination.k8s.io/v1beta1
discovery.k8s.io/v1beta1
events.k8s.io/v1
events.k8s.io/v1beta1
extensions/v1beta1
k8s.nginx.org/v1
k8s.nginx.org/v1alpha1
management.cattle.io/v3
metrics.k8s.io/v1beta1
monitoring.coreos.com/v1
networking.k8s.io/v1
networking.k8s.io/v1beta1
node.k8s.io/v1beta1
policy/v1beta1
rbac.authorization.k8s.io/v1
rbac.authorization.k8s.io/v1beta1
scheduling.k8s.io/v1
scheduling.k8s.io/v1beta1
storage.k8s.io/v1
storage.k8s.io/v1beta1
v1
容器镜像拉取策略
Image pull policy. One of Always, Never, IfNotPresent. Defaults to Always
https://kubernetes.io/docs/concepts/containers/images#updating-images
[[email protected] ~]# kubectl explain pod.spec.containers.imagePullPolicy
KIND: Pod
VERSION: v1
FIELD: imagePullPolicy <string>
DESCRIPTION:
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
Pod重启策略
Always, OnFailure,Never
https://kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle/#restart-policy
[[email protected] ~]# kubectl explain pod.spec.restartPolicy
KIND: Pod
VERSION: v1
FIELD: restartPolicy <string>
DESCRIPTION:
Restart policy for all containers within the pod. One of Always, OnFailure,
Never. Default to Always. More info:
https://kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle/#restart-policy
docker cli
Docker Hub Container Image Library
https://hub.docker.com/
https://hub.daocloud.io/
Pod对象的生命周期
[[email protected] ~]# kubectl explain pod.status.phase
DESCRIPTION:
The phase of a Pod is a simple, high-level summary of where the Pod is in
its lifecycle. The conditions array, the reason and message fields, and the
individual container status arrays contain more detail about the pod’s
status. There are five possible phase values:
Pending: The pod has been accepted by the Kubernetes system, but one or more of the container images has not been created. This includes time before being scheduled as well as time spent downloading images over the network, which could take a while.
Running: The pod has been bound to a node, and all of the containers have been created. At least one container is still running, or is in the process of starting or restarting.
Succeeded: All containers in the pod have terminated in success, and will not be restarted.
Failed: All containers in the pod have terminated, and at least one container has terminated in
failure. The container either exited with non-zero status or was terminated
by the system.
Unknown: 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.
More info:
https://kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle#pod-phase
liveness probe
exec 探针
http探针
tcp探针
[[email protected] ~]# kubectl explain pod.spec.containers.livenessProbe
KIND: Pod
VERSION: v1
RESOURCE: livenessProbe <Object>
DESCRIPTION:
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
Probe describes a health check to be performed against a container to
determine whether it is alive or ready to receive traffic.
FIELDS:
exec <Object>
One and only one of the following should be specified. Exec specifies the
action to take.
failureThreshold <integer>
Minimum consecutive failures for the probe to be considered failed after
having succeeded. Defaults to 3. Minimum value is 1.
httpGet <Object>
HTTPGet specifies the http request to perform.
initialDelaySeconds <integer>
Number of seconds after the container has started before liveness probes
are initiated. More info:
https://kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle#container-probes
periodSeconds <integer>
How often (in seconds) to perform the probe. Default to 10 seconds. Minimum
value is 1.
successThreshold <integer>
Minimum consecutive successes for the probe to be considered successful
after having failed. Defaults to 1. Must be 1 for liveness and startup.
Minimum value is 1.
tcpSocket <Object>
TCPSocket specifies an action involving a TCP port. TCP hooks not yet
supported
timeoutSeconds <integer>
Number of seconds after which the probe times out. Defaults to 1 second.
Minimum value is 1. More info:
https://kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle#container-probes
readiness probe
exec 探针
http探针
tcp探针
[[email protected] ~]# kubectl explain pod.spec.containers.readinessProbe
KIND: Pod
VERSION: v1
RESOURCE: readinessProbe <Object>
DESCRIPTION:
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
Probe describes a health check to be performed against a container to
determine whether it is alive or ready to receive traffic.
FIELDS:
exec <Object>
One and only one of the following should be specified. Exec specifies the
action to take.
failureThreshold <integer>
Minimum consecutive failures for the probe to be considered failed after
having succeeded. Defaults to 3. Minimum value is 1.
httpGet <Object>
HTTPGet specifies the http request to perform.
initialDelaySeconds <integer>
Number of seconds after the container has started before liveness probes
are initiated. More info:
https://kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle#container-probes
periodSeconds <integer>
How often (in seconds) to perform the probe. Default to 10 seconds. Minimum
value is 1.
successThreshold <integer>
Minimum consecutive successes for the probe to be considered successful
after having failed. Defaults to 1. Must be 1 for liveness and startup.
Minimum value is 1.
tcpSocket <Object>
TCPSocket specifies an action involving a TCP port. TCP hooks not yet
supported
timeoutSeconds <integer>
Number of seconds after which the probe times out. Defaults to 1 second.
Minimum value is 1. More info:
https://kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle#container-probes
存储卷
[[email protected] ~]# kubectl explain pod.spec.volumes | grep Object
RESOURCE: volumes <[]Object>
awsElasticBlockStore <Object>
azureDisk <Object>
azureFile <Object>
cephfs <Object>
cinder <Object>
configMap <Object>
csi <Object>
downwardAPI <Object>
emptyDir <Object>
ephemeral <Object>
fc <Object>
flexVolume <Object>
flocker <Object>
gcePersistentDisk <Object>
gitRepo <Object>
glusterfs <Object>
hostPath <Object>
iscsi <Object>
nfs <Object>
persistentVolumeClaim <Object>
photonPersistentDisk <Object>
portworxVolume <Object>
projected <Object>
quobyte <Object>
rbd <Object>
scaleIO <Object>
secret <Object>
storageos <Object>
vsphereVolume <Object>
Role & RoleBonding
Role 主要强调角色的定义，比如什么角色操作资源的具体权限；
RoleBonding 则 强调的是具体实例绑定到摸个Role中
Subject —> action(verb) —>object
subject : user account, service account
verb: create ， delete， update，apply，patch
object 为资源对象
Role example
##Role example ###
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
namespace: default
name: pod-reader
rules:
- apiGroups: [""] # "" 标明 core API 组
resources: ["pods"]
verbs: ["get", "watch", "list"]
RoleBonding
###RoleBonding ####
apiVersion: rbac.authorization.k8s.io/v1
# 此角色绑定允许 "jane" 读取 "default" 名字空间中的 Pod
# 你需要在该命名空间中有一个名为 “pod-reader” 的 Role
kind: RoleBinding
metadata:
name: read-pods
namespace: default
subjects:
# 你可以指定不止一个“subject（主体）”
- kind: User
name: jane # "name" 是区分大小写的
apiGroup: rbac.authorization.k8s.io
roleRef:
# "roleRef" 指定与某 Role 或 ClusterRole 的绑定关系
kind: Role # 此字段必须是 Role 或 ClusterRole
name: pod-reader # 此字段必须与你要绑定的 Role 或 ClusterRole 的名称匹配
apiGroup: rbac.authorization.k8s.io
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