k8s资源清单创建pod

资源:对象

service pod deployment

workload:pod,ReplicaSet,Deployment,statefulset,DaemonSet,Job,Crontabjob,...

服务发现和负载均衡:service ,Ingress,....

配置与存储:Volumn存储卷 ,CSI存储接口

ConfigMap,Secret,

DownwardAPI

集群级资源:namespace,Node,Role,ClusterRole,RoleBinding,ClusterRoleBinding,

元数据型资源

HPA,PodTemplate,LimitRange

kubectl get pod myapp-84cd4b7f95-h47cj -o yaml

yml文件查看pod详细的配置清单

创建资源的方法：

apiserver仅接收JSON格式的资源定义；

yaml格式提供配置清单，apiserver可自动转为json格式，而后在提交

kubectl api-versions

大部分资源的配置清单:

apiVerison:group/version,

kind:资源类别

metadata：元数据

name

namespace

labels

annotations 资源注解

每个资源的引用PATH

/api/GROUP/VERSION/namespaces/NAMESPACE/TYPE/NAME

spec:规格 期望的状态 disired state

spec.containers

- name <string>

image <string>

imagePullPolicy <string>

Always,Never,IfNotPresent

总是去仓库下载 不下载 不存在就去下载，存在就直接使用

修改镜像中默认的运用：

kubectl explain pods.spec.containers

command ,args

https://kubernetes.io/docs/tasks/inject-data-application/define-command-argument-container/#running-a-command-in-a-shell

标签labels

kubectl get pods --show-labels

key=value(小于63个字符)

key:字母,数字,”-_”

value:可以为空

kubectl get pods -l app --show-labels 找出含有app标签的pod

kubectl get pods -L app,run --show-labels -o wide 匹配字段查询

打标签

kubectl label –help

kubectl label pods pod-demo release=canary

类型   资源名     标签名=canary

kubectl get pods -l app --show-labels  查看是否打上标签

覆盖修改标签

kubectl label pods pod-demo release=stable –overwrite

kubectl get pods -l app,release --show-labels 既有app也有release标签

标签选择器

等值：=，==，！=

kubectl get pods -l release=stable  --show-labels

kubectl label pods nginx-7bb7cd8db5-7dn9r release=canary

kubectl get pods -l release

kubectl get pods -l release=canary

kubectl get pods -l release,app

kubectl get pods -l release=stable,app=myapp

kubectl get pods -l release!=canary --show-labels

集合关系：key in (values1,value2…), key not in (values1,value2…),key,!key

kubectl get pods -l "release in (canary,beta,alpha)" --show-labels

kubectl get pods -l "release notin (canary,beta,alpha)" --show-labels

许多资源支持内嵌字段定义其使用标签选择器：

matchLabels:直接给定键值，相当于=

matchExpressions:基于给定的表达式来定义使用标签选择器,{key:”KEY”,operator:”OPERATOR”,values:[VAL1,VAL2…]}大写字母表示替换

operator操作符:In ,NotIn values字段必须为非空列表

Exists,NotExists values字段必须为空列表

各种对象都能打标签，不仅限于pod，比如node

kubectl get nodes --show-labels

kubectl label nodes node02 disktype=ssd 对node02打标签

kubectl explain pods.spec

nodeSelector     <map[string]string> 节点标签选择器

kubectl label nodes node01 disktype=hd

vim pod-demo.yaml

containers:

…

nodeSelector:

disktype: hd

kubectl delete -f pod-demo.yaml

kubectl create -f pod-demo.yaml 再次创建会运行在node01上

kubectl describe pods pod-demo

nodeName   <string> 指定运行在哪个节点上

annotations:资源注解

与label不同的地方在于，它不能用于挑选资源对象，仅用于为对象提供”元数据”,

vim pod-demo.yaml

metadata:

…

annotations:

work in node02: "disk is ssd"

kubectl delete -f pod-demo.yaml

kubectl create -f pod-demo.yaml

kubectl describe pods pod-demo

Annotations:  work_in_node02: disk is ssd

status:当前状态，current state,本字段由kubernetes集群维护；用户不能定义

kubectl explain pods 查询pods怎么定义

kubectl explain pods.metadata 查询pods的metadata怎么定义

kubectl explain pods.spec

kubectl explain pods.spec.containers

kubectl explain pods.spec.containers.livenessProbe

例如:自定义一个pod资源

vim pod-demo.yaml

apiVersion: v1

kind: Pod

metadata:

name: pod-demo

namespace: default

labels:

app: myapp

tier: frontend

spec:

containers:

- name: myapp

image: ikubernetes/myapp:v1

ports:

- name: http

containerPort: 80

- name: https

containerPort: 443

- name: busybox

image: busybox:latest

imagePullPolicy: IfNotPresent

command:

- "/bin/sh"

- "-c"

- "sleep 3600"

注释:

spec:

containers:

- name: myapp

image: ikubernetes/myapp:v1

相当于 spec:{containers:['name:myapp'],image:"ikubernetes/myapp:v1"}

command:

- "/bin/sh"

- "-c"

- "sleep 3600"

相当于 command:["/bin/sh","-c","sleep 3600"]

kubectl create -f pod-demo.yaml    基于yaml清单文件创建pod资源

从文件加载创建资源

kubectl get pods 再查看一下创建的pod

kubectl describe pods pod-demo 查看创建的资源的描述信息

查看容器日志

kubectl logs pod-demo myapp

pod名  pod里面的容器名

进入容器

kubectl exec -it pod-demo -c myapp -- /bin/sh

输入和终端 pod名 -c指定容器名 --执行的命令

kubectl delete -f pod-demo.yaml 删除基于资源清单yaml文件定义的资源