云计算容器编排技术 课件 23Kubernetes基础对象3

Kubernetes基础对象3目录字段选择器01任务注解和注释说明02任务03任务推荐标签学习目标【知识目标】●了解Kubernetes的基础对象；●掌握字段选择器的使用；●了解推荐标签的使用。1注解和注释说明1注解的形式：键值对

key:values注解的作用：解释和说明存放临时数据注解和注释说明注解

annotations1注解和注释说明添加注解[root@node-1~]#kubectlgetnodesnode-1-oyamlapiVersion:v1kind:Nodemetadata:

annotations:kubeadm.alpha.Kubernetes.io/cri-socket:/var/run/dockershim.socknode.alpha.Kubernetes.io/ttl:"0"/IPv4Address:0/24/IPv4IPIPTunnelAddr:28volumes.Kubernetes.io/controller-managed-attach-detach:"true"creationTimestamp:"2020-07-14T07:56:23Z"labels:beta.Kubernetes.io/arch:amd64beta.Kubernetes.io/os:linuxKubernetes.io/arch:amd64Kubernetes.io/hostname:node-1Kubernetes.io/os:linuxnode-role.Kubernetes.io/master:""1注解和注释说明添加注解[root@node-1~]#vitest-pod.yamlapiVersion:v1kind:Podmetadata:name:annotations-demo

annotations:imageregistry:"/"spec:containers:-name:nginximage:nginx:1.14.2ports:-containerPort:80下边是一个Pod的配置文件，其注解中包含

imageregistry的访问地址1注解和注释说明添加注解[root@node-1~]#vitest.yamlapiVersion:apps/v1kind:Deploymentmetadata:creationTimestamp:nulllabels:app:testenvironment:productversion:1.7.9

annotations:

imageregistry:0:5000nginx.version:1.7.9name:testnamespace:demo下面是一个Deployment的配置文件，其注解中包含

imageregistry的访问地址和nginx的版本1执行yaml文件如下：[root@node-1~]#kubectlapply-ftest.yamldeployment.apps/testconfigured[root@node-1~]#kubectlgetdeployments.apps-ndemo-oyaml。。。annotations:deployment.Kubernetes.io/revision:"1"imageregistry:0:5000kubectl.Kubernetes.io/last-applied-configuration:|{"apiVersion":"apps/v1","kind":"Deployment","metadata":{"annotations":{"imageregistry":"0:5000","nginx.version":"1.7.9"},"creationTimestamp":null,"labels":{"app":"test","environment":"product","version":"1.7.9"},"name":"test","namespace":"demo"},"spec":{"replicas":3,"selector":{"matchLabels":{"app":"test","environment":"product","version":"1.7.9"}},"strategy":{},"template":{"metadata":{"creationTimestamp":null,"labels":{"app":"test","environment":"product","version":"1.7.9"}},"spec":{"containers":[{"image":"nginx:1.7.9","name":"nginx","resources":{}}]}}},"status":{}}nginx.version:1.7.9creationTimestamp:"2020-07-20T01:45:49Z"generation:3注解和注释说明查看注解2字段选择器2下面这个

kubectl

命令将筛选出

status.phase

字段值为

Running

的所有Pod：[root@node-1~]#kubectlgetpods--field-selectorstatus.phase=Running字段选择器字段选择器

selector2默认情况下，字段选择器未被应用kubectlgetpods

和

kubectlgetpods--field-selector

查询等效字段选择器2不同的Kubernetes资源类型支持不同的字段选择器；所有资源类型都支持

和

space

字段；使用不被支持的字段选择器会产生错误。字段选择器支持的字段2错误示例：[root@node-1~]#kubectlgetingress--field-selectorfoo.bar=bazErrorfromserver(BadRequest):Unabletofind"ingresses"thatmatchlabelselector"",fieldselector"foo.bar=baz":"foo.bar"isnotaknownfieldselector:only"","space"字段选择器支持的字段2在字段选择器中使用=、==

和

!=

（=

和

==

的意义是相同的）操作符。下面这个kubectl命令将筛选所有不属于default命名空间的Kubernetes服务：[root@node-1~]#kubectlgetservices--all-namespaces--field-selectorspace!=default字段选择器支持的操作符2字段选择器可以通过使用逗号分隔的列表组成一个选择链。下面这个

kubectl

命令将筛选

status.phase

字段不等于

Running

同时

spec.restartPolicy

字段等于

Always

的所有Pod：[root@node-1~]#kubectlgetpods--field-selector=status.phase!=Running,spec.restartPolicy=Always字段选择器链式选择器2可以跨多种资源类型来使用字段选择器。下面这个

kubectl

命令将筛选出所有不在

default

命名空间中的StatefulSet和Service：[root@node-1~]#kubectlgetstatefulsets,services--all-namespaces--field-selectorspace!=default字段选择器多种资源类型2过滤podIP字段[root@node-1~]#kubectlgetpods-ndemo-oyamlpodIP:7[root@node-1~]#kubectlgetpods--field-selectorstatus.podIP=7-ndemo-owideNAME

READYSTATUSRESTARTSAGE

IP

NODENOMINATEDNODEREADINESSGATEStest-cdd9f47-6cswn1/1

Running0

117m7node-2<none>

<none>字段选择器字段选择器案例2过滤phase=Running[root@node-1~]#kubectlgetpods--field-selectorstatus.phase=RunningNAME

READYSTATUSRESTARTSAGEapp-demo-76f6796dcc-ll7m6

1/1

Running0

5d1happ-nginx-demo-d96686864-rvn6g

1/1

Running0

4d17happ-nginx-demo-d96686864-trjnk

1/1

Running0

139mapp-nginx-demo-d96686864-vvft8

1/1

Running0

139mapp-nginx-demo-d96686864-wjjc4

1/1

Running0

4d17hdashboard-demo-c8c9df95b-5nwth

1/1

Running0

139mdashboard-demo-c8c9df95b-pmbn61/1

Running0

3d18hdashboard-demo-c8c9df95b-vc8xx

1/1

Running0

3d18hnginx-app-demo

1/1

Running0

5d1h字段选择器字段选择器案例3推荐标签3推荐标签推荐标签推荐标签使管理应用程序变得更容易,但不是任何核心工具所必需的3推荐标签简单的无状态服务下面的Deployment用于监督运行应用本身的那些Pod。apiVersion:apps/v1kind:Deploymentmetadata:labels:app.Kubernetes.io/name:myserviceapp.Kubernetes.io/instance:myservice-abcxzy。。。3推荐标签下面的

Service

用于暴露应用。apiVersion:v1kind:Servicemetadata:labels:app.Kubernetes.io/name:myserviceapp.Kubernetes.io/instance:myservice-abcxzy。。。简单的无状态服务3推荐标签一个使用Helm安装的WordPress应用，其中使用了MySQL数据库。以下代码片段说明用于部署此应用程序的对象的开始。以下

Deployment

的开头用于WordPress：apiVersion:apps/v1kind:Deploymentmetadata:labels:app.Kubernetes.io/name:wordpressapp.Kubernetes.io/instance:wordpress-abcxzyapp.Kubernetes.io/version:"4.9.4"app.Kubernetes.io/managed-by:helmapp.Kubernetes.io/component:serverapp.Kubernetes.io/part-of:wordpress...带数据库的Web应用程序3推荐标签Service

用于暴露WordPress：apiVersion:v1kind:Servicemetadata:labels:app.Kubernetes.io/name:wordpressapp.Kubernetes.io/instance:wordpress-abcxzyapp.Kubernetes.io/version:"4.9.4"app.Kubernetes.io/managed-by:helmapp.Kubernetes.io/component:serverapp.Kubernetes.io/part-of:wordpress...带数据库的Web应用程序3推荐标签MySQL作为一个

StatefulSet

暴露，包含它和它