标签：kubectl V03 Kubernetes NO nginx master pod k8s root

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[CloudNative：Kubernetes&pod操作.V03]                                                                [Applications.CloudNative][controller Deployment概述和应用场景/发布|service概述/三种类型|][controller statefulset部署有状态应用|controller daemonset部署守护进程|][controller job和cronjob一次任务和定时任务|配置管理secret|配置管理configmap|]

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一、service概述
二、services定义pod的访问规则

### --- services定义pod的访问规则
### --- 防止pod失联
~~~		某一个服务想要访问到哪一个Pod，由servvices来负责，起到一个负载均衡的作用。
~~~		定义Pod的负载均衡。
~~~		services存在的意义：防止pod失联，pod负载均衡的作用

[root@k8s-master ~]# kubectl get pods -o wide
NAME                    READY   STATUS    RESTARTS   AGE    IP            NODE        NOMINATED NODE   READINESS GATES
nginx-f89759699-4msbd   1/1     Running   0          133m   10.244.1.5    k8s-node1   <none>           <none>
web-bbcf684cb-2g2wr     1/1     Running   0          104m   10.244.2.13   k8s-node2   <none>           <none>
web-bbcf684cb-672j9     1/1     Running   0          104m   10.244.1.11   k8s-node1   <none>           <none>
web-bbcf684cb-bjbrj     1/1     Running   0          104m   10.244.2.14   k8s-node2   <none>           <none>
web-bbcf684cb-ctpv2     1/1     Running   0          104m   10.244.2.15   k8s-node2   <none>           <none>
web-bbcf684cb-hr8j5     1/1     Running   0          104m   10.244.1.9    k8s-node1   <none>           <none>
web-bbcf684cb-jbm8l     1/1     Running   0          104m   10.244.1.12   k8s-node1   <none>           <none>
web-bbcf684cb-rn4pt     1/1     Running   0          104m   10.244.1.10   k8s-node1   <none>           <none>
web-bbcf684cb-vr2pb     1/1     Running   0          104m   10.244.2.16   k8s-node2   <none>           <none>
web-bbcf684cb-w894j     1/1     Running   0          107m   10.244.1.8    k8s-node1   <none>           <none>
web-bbcf684cb-xgdfq     1/1     Running   0          104m   10.244.2.12   k8s-node2   <none>           <none>

三、通过yaml文件进行部署service

### --- 通过yaml文件进行部署
~~~		将sts.yaml上传到服务器；创建三个副本，三个pod
~~~		查看pod，每个pod的名称为唯一的

[root@k8s-master ~]# vim sts.yaml
apiVersion: v1
kind: Service
metadata:
  name: nginx
  labels:
    app: nginx
spec:
  ports:
  - port: 80
    name: web
  clusterIP: None
  selector:
    app: nginx

---

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: nginx-statefulset
  namespace: default
spec:
  serviceName: nginx
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:latest
        ports:
        - containerPort: 80

[root@k8s-master ~]# kubectl apply -f sts.yaml 
service/nginx created
statefulset.apps/nginx-statefulset created
 
[root@k8s-master ~]# kubectl get pods
NAME                    READY   STATUS    RESTARTS   AGE
nginx-statefulset-0     1/1     Running   0          2m27s
nginx-statefulset-1     1/1     Running   0          119s
nginx-statefulset-2     1/1     Running   0          88s

~~~		查看创建之后的services，services是无头的
~~~		None表示为无头的
~~~		唯一个网络标识，如何约定的

[root@k8s-master ~]# kubectl get svc
nginx        ClusterIP   None            <none>        80/TCP         4m43s

### --- 确保所有node运行在同一个pod中
~~~		通过DaemonSet部署所有node运行在同一个pod当中
~~~		将ds.yaml上传到服务器

[root@k8s-master ~]# cat ds.yaml 
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: ds-test 
  labels:
    app: filebeat
spec:
  selector:
    matchLabels:
      app: filebeat
  template:
    metadata:
      labels:
        app: filebeat
    spec:
      containers:
      - name: logs
        image: nginx
        ports:
        - containerPort: 80
        volumeMounts:
        - name: varlog
          mountPath: /tmp/log
      volumes:
      - name: varlog
        hostPath:
          path: /var/log

~~~		删除所有的pod
[root@k8s-master ~]# kubectl delete statefulset --all       
statefulset.apps "nginx-statefulset" deleted 
[root@k8s-master ~]# kubectl delete svc nginx
service "nginx" deleted
[root@k8s-master ~]# kubectl get svc
NAME         TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)   AGE
kubernetes   ClusterIP   10.96.0.1    <none>        443/TCP   3d5h

~~~		删除所有的pod
[root@k8s-master ~]# kubectl delete pod --all 

~~~		执行ds.yaml文件

[root@k8s-master ~]# kubectl apply -f ds.yaml 
daemonset.apps/ds-test created
[root@k8s-master ~]# kubectl get pods
ds-test-fv2kx           0/1     ContainerCreating   0          20s
ds-test-gzxlq           0/1     ContainerCreating   0          20s

~~~		进入某一个pod里面，查看日志
~~~		进入pod里面

[root@k8s-master ~]# kubectl exec -it ds-test-fv2kx bash
kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl kubectl exec [POD] -- [COMMAND] instead.
root@ds-test-fv2kx:/# ls /tmp/log/                  # 已经采集到日志数据
anaconda  boot.log       btmp    cron   dmesg.old  grubby_prune_debug  maillog   pods  secure   tallylog  vmware-vgauthsvc.log.0  wtmp
audit     boot.log-20210222  containers  dmesg  firewalld  lastlog         messages  rhsm  spooler  tuned     vmware-vmsvc.log    yum.log

四、一次性任务

### --- job（一次性任务）

[root@k8s-master ~]# kubectl get pods
NAME                    READY   STATUS    RESTARTS   AGE
ds-test-fv2kx           1/1     Running   0          4m3s
ds-test-gzxlq           1/1     Running   0          4m3s

~~~		创建一次性任务；将该文件job.yaml上传到服务器中

[root@k8s-master ~]# vim job.yaml
apiVersion: batch/v1
kind: Job
metadata:
  name: pi
spec:
  template:
    spec:
      containers:
      - name: pi
        image: perl
        command: ["perl",  "-Mbignum=bpi", "-wle", "print bpi(2000)"]
      restartPolicy: Never
  backoffLimit: 4

[root@k8s-master ~]# kubectl create -f job.yaml
job.batch/pi created
 
[root@k8s-master ~]# kubectl get pods
pi-p4tlp                0/1     ContainerCreating   0          13s

### --- 查看定时任务
[root@k8s-master ~]# kubectl get jobs
NAME   COMPLETIONS   DURATION   AGE
pi     1/1           2m8s       2m10s
 
~~~		查看pod属于哪个node节点
[root@k8s-master ~]# kubectl get pods -o wide
pi-p4tlp                0/1     running   0          64s     <none>        k8s-node1   <none>           <none>

~~~		可以查看到镜像下载状态
[root@k8s-node1 ~]# docker pull perl
 
~~~		因为它是一次性任务，所以会显示Completed
[root@k8s-master ~]# kubectl get pods
pi-p4tlp                0/1     Completed   0          13m

### --- 通过日志查看它的运算
[root@k8s-master ~]# kubectl logs pi-p4tlp
3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679821480865132823066470938446095505822317253594081284811174502841027019385211055596446229489549303819644288109756659334461284756482337867831652712019091456485669234603486104543266482133936072602491412737245870066063155881748815209209628292540917153643678925903600113305305488204665213841469519415116094330572703657595919530921861173819326117931051185480744623799627495673518857527248912279381830119491298336733624406566430860213949463952247371907021798609437027705392171762931767523846748184676694051320005681271452635608277857713427577896091736371787214684409012249534301465495853710507922796892589235420199561121290219608640344181598136297747713099605187072113499999983729780499510597317328160963185950244594553469083026425223082533446850352619311881710100031378387528865875332083814206171776691473035982534904287554687311595628638823537875937519577818577805321712268066130019278766111959092164201989380952572010654858632788659361533818279682303019520353018529689957736225994138912497217752834791315155748572424541506959508295331168617278558890750983817546374649393192550604009277016711390098488240128583616035637076601047101819429555961989467678374494482553797747268471040475346462080466842590694912933136770289891521047521620569660240580381501935112533824300355876402474964732639141992726042699227967823547816360093417216412199245863150302861829745557067498385054945885869269956909272107975093029553211653449872027559602364806654991198818347977535663698074265425278625518184175746728909777727938000816470600161452491921732172147723501414419735685481613611573525521334757418494684385233239073941433345477624168625189835694855620992192221842725502542568876717904946016534668049886272327917860857843838279679766814541009538837863609506800642251252051173929848960841284886269456042419652850222106611863067442786220391949450471237137869609563643719172874677646575739624138908658326459958133904780275901

~~~		删除掉job.yaml文件后，才会删除掉pods
[root@k8s-master ~]# kubectl delete -f job.yaml
job.batch "pi" deleted
[root@k8s-master ~]# kubectl get pods

五、定时任务

### --- controller（定时任务）
~~~		将cronjob.yaml上传到服务器

[root@k8s-master ~]# cat cronjob.yaml 
apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name: hello
spec:
  schedule: "*/1 * * * *"           #定时任务的表达式
  jobTemplate:
    spec:
      template:
        spec:
          containers:
          - name: hello
            image: busybox
            args:
            - /bin/sh
            - -c
            - date; echo Hello from the Kubernetes cluster
          restartPolicy: OnFailure

[root@k8s-master ~]# kubectl apply -f cronjob.yaml 
cronjob.batch/hello created
 
[root@k8s-master ~]# kubectl get pods
hello-1614003120-5tmz6   0/1     ContainerCreating   0          10s

[root@k8s-master ~]# kubectl get cronjobs
NAME    SCHEDULE      SUSPEND   ACTIVE   LAST SCHEDULE   AGE
hello   */1 * * * *   False     1        51s             107s
 
[root@k8s-master ~]# kubectl logs hello-1614003120-5tmz6
Mon Feb 22 14:12:51 UTC 2021
Hello from the Kubernetes cluster

### --- 每隔一段时间执行一次，历史的会变成completed

[root@k8s-master ~]# kubectl get pods
hello-1614003120-5tmz6   0/1     Completed           0          86s
hello-1614003180-2fppm   0/1     ContainerCreating   0          26s

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Walter Savage Landor:strove with none,for none was worth my strife.Nature I loved and, next to Nature, Art:I warm'd both hands before the fire of life.It sinks, and I am ready to depart                                                                                                                                                   ——W.S.Landor

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来自为知笔记(Wiz)

标签：kubectl,V03,Kubernetes,NO,nginx,master,pod,k8s,root
来源： https://www.cnblogs.com/yanqivip/p/16067088.html

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