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首页 / 原创|NO.A.0005|专题|——|云计算|K8S|Pod|节点亲和性|污点和污点容忍|Deployment|

原创|NO.A.0005|专题|——|云计算|K8S|Pod|节点亲和性|污点和污点容忍|Deployment|

Java BBS 2021-05-03
301

一、标题：

原创|NO.A.0005|专题|——|云计算|K8S|Pod概述和意义|Pod两种实现机制|Pod镜像拉取/重启策略/资源限制|Pod健康检查|Pod调度策略:创建Pod流程/影响Pod调度(资源限制和节点选择器)|节点亲和性|污点和污点容忍|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|

——>实验专题<——

六、k8s核心技术——pod

——>pod概述-流程概述<——

Pod实现机制-共享网络

Pod实现机制——共享存储

镜像拉取策略

Pod资源限制示例

Pod重启策略

Pod健康检查

[root@k8s-master ~]# kubectl get pods           #状态为running，java堆内存溢出，检测可能不能对外提供服务，通过容器检查可能不能检查出故障
NAME                    READY   STATUS    RESTARTS   AGE
nginx-f89759699-p8tnx   1/1     Running   0          3d

创建Pod流程

Pod调度节点亲和性

Pod调度节点选择器

Pod调度-污点，污点容忍

[root@k8s-master ~]# kubectl describe node k8s-master |grep Taint  #查看污点
Taints:             node-role.kubernetes.io/master:NoSchedule
[root@k8s-master ~]# kubectl describe node k8s-node1 |grep Taint
Taints:             <none>
[root@k8s-master ~]# kubectl describe node k8s-node2 |grep Taint
Taints:             <none>
[root@k8s-master ~]# kubectl create deployment web --image=nginx 
deployment.apps/web created
[root@k8s-master ~]# kubectl get pods
NAME                    READY   STATUS              RESTARTS   AGE
nginx-f89759699-p8tnx   1/1     Running             0          3d
web-5dcb957ccc-4sbc6    0/1     ContainerCreating   0          7s
[root@k8s-master ~]# kubectl get pods -o wide
NAME                    READY   STATUS              RESTARTS   AGE   IP           NODE        NOMINATED NODE   READINESS GATES
nginx-f89759699-p8tnx   1/1     Running             0          3d    10.244.1.2   k8s-node1   <none>           <none>
web-5dcb957ccc-4sbc6    0/1     ContainerCreating   0          19s   <none>       k8s-node2   <none>           <none>
[root@k8s-master ~]# kubectl scale deployment web --replicas=5
deployment.apps/web scaled
[root@k8s-master ~]# kubectl get pods -o wide                       #没有加污点，所以会加入到node1或者node2 上
NAME                    READY   STATUS              RESTARTS   AGE   IP           NODE        NOMINATED NODE   READINESS GATES
nginx-f89759699-p8tnx   1/1     Running             0          3d    10.244.1.2   k8s-node1   <none>           <none>
web-5dcb957ccc-4sbc6    1/1     Running             0          50s   10.244.2.2   k8s-node2   <none>           <none>
web-5dcb957ccc-9mrhr    0/1     ContainerCreating   0          3s    <none>       k8s-node1   <none>           <none>
web-5dcb957ccc-9qfjx    0/1     ContainerCreating   0          3s    <none>       k8s-node2   <none>           <none>
web-5dcb957ccc-jtpwt    0/1     ContainerCreating   0          3s    <none>       k8s-node2   <none>           <none>
web-5dcb957ccc-wkvm5    0/1     ContainerCreating   0          3s    <none>       k8s-node1   <none>           <none>
[root@k8s-master ~]# kubectl delete deployment web        #删掉刚才的创建
deployment.apps "web" deleted
[root@k8s-master ~]# kubectl get pods    
[root@k8s-master ~]# kubectl taint node k8s-node1 env_role=yes:NoSchedule       #加上污点
node/k8s-node1 tainted
[root@k8s-master ~]# kubectl describe node k8s-node1 |grep Taint        #查看污点NoSchedule
Taints:             env_role=yes:NoSchedule
#验证：
[root@k8s-master ~]# kubectl create deployment web --image=nginx 
deployment.apps/web created
[root@k8s-master ~]# kubectl get pods -o wide
NAME                    READY   STATUS    RESTARTS   AGE   IP           NODE        NOMINATED NODE   READINESS GATES
nginx-f89759699-p8tnx   1/1     Running   0          3d    10.244.1.2   k8s-node1   <none>           <none>
web-5dcb957ccc-8dp8w    1/1     Running   0          12s   10.244.2.5   k8s-node2   <none>           <none>
[root@k8s-master ~]# kubectl scale deployment web --replicas=5
deployment.apps/web scaled
[root@k8s-master ~]# kubectl get pods -o wide              #都调度到node2节点，因为node1不会被调度
NAME                    READY   STATUS    RESTARTS   AGE   IP           NODE        NOMINATED NODE   READINESS GATES
nginx-f89759699-p8tnx   1/1     Running   0          3d    10.244.1.2   k8s-node1   <none>           <none>
web-5dcb957ccc-88rvn    1/1     Running   0          3s    10.244.2.6   k8s-node2   <none>           <none>
web-5dcb957ccc-8dp8w    1/1     Running   0          26s   10.244.2.5   k8s-node2   <none>           <none>
web-5dcb957ccc-d4t6w    1/1     Running   0          3s    10.244.2.7   k8s-node2   <none>           <none>
web-5dcb957ccc-f9jd7    1/1     Running   0          3s    10.244.2.9   k8s-node2   <none>           <none>
web-5dcb957ccc-xrvfr    1/1     Running   0          3s    10.244.2.8   k8s-node2   <none>           <none>
#删除污点
[root@k8s-master ~]# kubectl describe node k8s-node1 |grep Taint
Taints:             env_role=yes:NoSchedule
[root@k8s-master ~]# kubectl taint node k8s-node1 env_role:NoSchedule-  #注意：后面有个横杠
node/k8s-node1 untainted
[root@k8s-master ~]# kubectl describe node k8s-node1 |grep Taint
Taints:             <none>

=================================END==================================

八、kubernetes核心技术-Controller控制器

——>controller流程概述<——

#1、使用deployment部署应用（yaml）
[root@k8s-master ~]# kubectl create deployment web --image=nginx      #就可以部署，但是只能做测试环境
[root@k8s-master ~]# kubectl create deployment web --image=nginx --dry-run -o yaml  #生成yaml文件
[root@k8s-master ~]# kubectl create deployment web --image=nginx --dry-run -o yaml > web.yaml       #申城yaml文件并导出
[root@k8s-master ~]# vim web.yaml 
spec:                                                     #通过这两条做匹配，selector和labels标签来做匹配
  replicas: 1
  selector:
    matchLabels:
      app: web
  strategy: {}
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: web
#2、通过yaml文件进行部署
[root@k8s-master ~]# kubectl apply -f web.yaml
deployment.apps/web configured
[root@k8s-master ~]# kubectl get pods                     #查看部署的应用
#3、对外发布部署
[root@k8s-master ~]# kubectl expose deployment web --port=80 --type=NodePort --target-port=80 --name=web1 -o yaml > web1.yaml
[root@k8s-master ~]# kubectl apply -f web1.yaml           #部署
[root@k8s-master ~]# kubectl get pods,svc
#4、通过浏览器来访问验证部署是否验证成功
#应用升级回滚和弹性伸缩
#1、指定nginx版本
[root@k8s-master ~]# vim web.yaml
    spec:
      containers:
      - image: nginx:1.14                                 #指定为1.14的版本
[root@k8s-master ~]# kubectl apply -f web.yaml 
deployment.apps/web configured
[root@k8s-master ~]# kubectl get pods
web-66bf4959f5-dh6dm    0/1     ContainerCreating   0          23s
#2、升级nginx到1.15版本
[root@k8s-master ~]# kubectl set image deployment web nginx=nginx:1.15
deployment.apps/web image updated
[root@k8s-master ~]# kubectl get pods                     #在做升级的操作
NAME                    READY   STATUS              RESTARTS   AGE
nginx-f89759699-4msbd   1/1     Running             0          16m
web-66bf4959f5-dh6dm    1/1     Running             0          3m34s
web-bbcf684cb-cj274     0/1     ContainerCreating   0          4s
#node节点可以看到镜像的版本1.15下载成功
[root@k8s-node1 ~]# docker images
nginx       1.15                53f3fd8007f7        21 months ago       109MB
#查看升级后的状态：显示successfully是成功的
[root@k8s-master ~]# kubectl rollout status deployment web
deployment "web" successfully rolled out
#3、把nginx1.15回滚到nginx1.14版本
[root@k8s-master ~]# kubectl rollout history  deployment web
deployment.apps/web 
REVISION  CHANGE-CAUSE
1         <none>
2         <none>                                          #nginx1.14版本
3         <none>                                          #当前的版本：1.15版本
[root@k8s-master ~]# kubectl rollout undo  deployment web         #回滚到上一个版本
deployment.apps/web rolled back
[root@k8s-master ~]# kubectl rollout status deployment web        #查看回滚的状态
Waiting for deployment "web" rollout to finish: 1 old replicas are pending termination...
Waiting for deployment "web" rollout to finish: 1 old replicas are pending termination...
deployment "web" successfully rolled out
#4、把nginx1.14回滚到指定的版本
[root@k8s-master ~]# kubectl rollout undo  deployment web --to-revision=3
deployment.apps/web rolled back                          #回滚到第三个版本
[root@k8s-master ~]# kubectl rollout status deployment web
Waiting for deployment "web" rollout to finish: 1 old replicas are pending termination...
Waiting for deployment "web" rollout to finish: 1 old replicas are pending termination...
deployment "web" successfully rolled out
#5、弹性伸缩
[root@k8s-master ~]# kubectl get pods
NAME                    READY   STATUS    RESTARTS   AGE
nginx-f89759699-4msbd   1/1     Running   0          28m
web-bbcf684cb-w894j     1/1     Running   0          2m20s
[root@k8s-master ~]# kubectl scale deployment web --replicas=10 #创建10个
deployment.apps/web scaled
[root@k8s-master ~]# kubectl get pods
NAME                    READY   STATUS             RESTARTS   AGE
nginx-f89759699-4msbd   1/1     Running            0          31m
web-bbcf684cb-2g2wr     1/1     Running            0          2m54s
web-bbcf684cb-672j9     1/1     Running            0          2m54s
web-bbcf684cb-bjbrj     1/1     Running            0          2m54s
web-bbcf684cb-ctpv2     1/1     Running            0          2m54s
web-bbcf684cb-hr8j5     1/1     Running            0          2m54s
web-bbcf684cb-jbm8l     1/1     Running            0          2m54s
web-bbcf684cb-rn4pt     1/1     Running            0          2m54s
web-bbcf684cb-vr2pb     1/1     Running            0          2m54s
web-bbcf684cb-w894j     1/1     Running            0          5m50s
web-bbcf684cb-xgdfq     0/1     Running            0          2m54s

service


#services定义pod的访问规则
#1、防止pod失联
[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>
#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
#2、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
[root@k8s-master ~]# kubectl get svc
nginx        ClusterIP   None            <none>        80/TCP         4m43s
#None表示为无头的
#唯一个网络标识，如何约定的
#3、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
[root@k8s-master ~]# kubectl delete pod --all            #删除所有的pod
#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
[root@k8s-master ~]# kubectl exec -it ds-test-fv2kx bash  #进入pod里面
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
#4、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
[root@k8s-master ~]# kubectl get jobs                  #查看定时任务
NAME   COMPLETIONS   DURATION   AGE
pi     1/1           2m8s       2m10s
[root@k8s-master ~]# kubectl get pods -o wide          #查看pod属于哪个node节点
pi-p4tlp                0/1     running   0          64s     <none>        k8s-node1   <none>           <none>
[root@k8s-node1 ~]# docker pull perl                   #可以查看到镜像下载状态
[root@k8s-master ~]# kubectl get pods                  #因为它是一次性任务，所以会显示Completed
pi-p4tlp                0/1     Completed   0          13m
[root@k8s-master ~]# kubectl logs pi-p4tlp             #通过日志查看它的运算
3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679821480865132823066470938446095505822317253594081284811174502841027019385211055596446229489549303819644288109756659334461284756482337867831652712019091456485669234603486104543266482133936072602491412737245870066063155881748815209209628292540917153643678925903600113305305488204665213841469519415116094330572703657595919530921861173819326117931051185480744623799627495673518857527248912279381830119491298336733624406566430860213949463952247371907021798609437027705392171762931767523846748184676694051320005681271452635608277857713427577896091736371787214684409012249534301465495853710507922796892589235420199561121290219608640344181598136297747713099605187072113499999983729780499510597317328160963185950244594553469083026425223082533446850352619311881710100031378387528865875332083814206171776691473035982534904287554687311595628638823537875937519577818577805321712268066130019278766111959092164201989380952572010654858632788659361533818279682303019520353018529689957736225994138912497217752834791315155748572424541506959508295331168617278558890750983817546374649393192550604009277016711390098488240128583616035637076601047101819429555961989467678374494482553797747268471040475346462080466842590694912933136770289891521047521620569660240580381501935112533824300355876402474964732639141992726042699227967823547816360093417216412199245863150302861829745557067498385054945885869269956909272107975093029553211653449872027559602364806654991198818347977535663698074265425278625518184175746728909777727938000816470600161452491921732172147723501414419735685481613611573525521334757418494684385233239073941433345477624168625189835694855620992192221842725502542568876717904946016534668049886272327917860857843838279679766814541009538837863609506800642251252051173929848960841284886269456042419652850222106611863067442786220391949450471237137869609563643719172874677646575739624138908658326459958133904780275901
[root@k8s-master ~]# kubectl delete -f job.yaml        #删除掉job.yaml文件后，才会删除掉pods
job.batch "pi" deleted
[root@k8s-master ~]# kubectl get pods
#5、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
[root@k8s-master ~]# kubectl get pods                    #每隔一段时间执行一次，历史的会变成completed
hello-1614003120-5tmz6   0/1     Completed           0          86s
hello-1614003180-2fppm   0/1     ContainerCreating   0          26s

controller


#对base64进行编码执行
[root@k8s-master ~]# echo -n 'admin' | base64
YWRtaW4=
#将下列文件上传到服务器
[root@k8s-master ~]# ls secret*
secret-var.yaml  secret-vol.yaml  secret.yaml
#1、创建Secret加密数据
apiVersion: v1
kind: Secret
metadata:
name: mysecret
type: Opaque
data:
  username: YWRtaW4=                                      #将该内容改为创建的base64编码
password: MWYyZDFlMmU2N2Rm        
[root@k8s-master ~]# kubectl create -f secret.yaml 
secret/mysecret created
[root@k8s-master ~]# kubectl get secret                  #创建完成一个secret编码数据的过程
NAME                  TYPE                                  DATA   AGE
default-token-686hn   kubernetes.io/service-account-token   3      3d7h
mysecret              Opaque                                2      11s  
#2、在pod中挂载编码
#2.1、以变量的形式把编码的数据挂载到pod容器中
[root@k8s-master ~]# vim secret-var.yaml 
apiVersion: v1
kind: Pod
metadata:
name: mypod
spec:
containers:
  - name: nginx
image: nginx
env:
      - name: SECRET_USERNAME
        valueFrom:                                       #以变量的形式挂载
secretKeyRef:
name: mysecret
key: username
      - name: SECRET_PASSWORD
valueFrom:
secretKeyRef:
name: mysecret
key: password
[root@k8s-master ~]# kubectl apply -f secret-var.yaml 
pod/mypod created
[root@k8s-master ~]# kubectl get pods
mypod                    1/1     Running     0          11s            
 [root@k8s-master ~]# kubectl exec -it mypod bash
kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl kubectl exec [POD] -- [COMMAND] instead.
root@mypod:/# echo $SECRET_USERNAME                     #echo输出username及密码，
admin
root@mypod:/# echo $SECRET_PASSWORD
1f2d1e2e67df
#2.2、通过volume形式挂载到pod中
[root@k8s-master ~]# vim secret-vol.yaml 
apiVersion: v1
kind: Pod
metadata:
name: mypod
spec:
containers:
  - name: nginx                                                     #名字一致
image: nginx
volumeMounts:
    - name: foo
mountPath: "/etc/foo"                                         #挂载地址
readOnly: true
volumes:
  - name: foo
secret:
secretName: mysecret 
[root@k8s-master ~]# kubectl delete -f secret-var.yaml    #删除挂载形式的配置
pod "mypod" deleted
[root@k8s-master ~]# kubectl apply -f secret-vol.yaml 
pod/mypod created
[root@k8s-master ~]# kubectl get pods
mypod                    0/1     Running   0          14s
[root@k8s-master ~]# kubectl exec -it mypod bash
root@mypod:/# ls /etc/foo/
password  username
root@mypod:/# cat /etc/foo/username                      #在提示符上显示输出值
adminroot@mypod:/# cat /etc/foo/password

configMap：不加密数据

#将历史环境删除
[root@k8s-master ~]# kubectl delete secret --all
secret "default-token-686hn" deleted
secret "mysecret" deleted
[root@k8s-master ~]# kubectl delete Pod --all
pod "ds-test-fv2kx" deleted
pod "ds-test-gzxlq" deleted
pod "hello-1614010320-rh726" deleted
pod "hello-1614010380-mt6dc" deleted
pod "hello-1614010440-dcqzj" deleted
pod "mypod" deleted
pod "nginx-f89759699-gp9rr" deleted
#将配置文件上传到服务器
[root@k8s-master ~]# ls cm* config* myconfig* redis*
cm.yaml  config-var.yaml  myconfig.yaml  redis.properties
#1、常见配置文件redis.properties
[root@k8s-master ~]# vim redis.properties
redis.host=127.0.0.1
redis.port=6379
redis.password=123456
#2、创建configmap
[root@k8s-master ~]# kubectl create configmap redis.config --from-file=redis.properties
configmap/redis.config created
[root@k8s-master ~]# kubectl get cm
NAME           DATA   AGE
redis.config   1      17s 
[root@k8s-master ~]# kubectl describe cm redis.config     #查看它的详细信息
Name:         redis.config
Namespace:    default
Labels:       <none>
Annotations:  <none>


Data
====
redis.properties:
----
redis.host=127.0.0.1
redis.port=6379
redis.password=123456


Events:  <none> 
#3、以volume的形式挂载到pod里面
[root@k8s-master ~]# vim cm.yaml 
apiVersion: v1
kind: Pod
metadata:
  name: mypod
spec:
  containers:
    - name: busybox
      image: busybox
      command: [ "/bin/sh","-c","cat /etc/config/redis.properties" ]
      volumeMounts:
      - name: config-volume
        mountPath: /etc/config
  volumes:
    - name: config-volume
      configMap:
        name: redis-config                            #configmap的名字
  restartPolicy: Never 
[root@k8s-master ~]# kubectl apply -f cm.yaml 
pod/mypod created
[root@k8s-master ~]# kubectl get pods
mypod                    0/1     ContainerCreating   0          7s  
[root@k8s-master ~]# kubectl logs mypod                #查看挂载的值
redis.host=127.0.0.1
redis.port=6379
redis.password=123456  
#4、以变量形式挂载
[root@k8s-master ~]# kubectl delete -f cm.yaml          #删除历史创建
pod "mypod" deleted
[root@k8s-master ~]# vim myconfig.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: myconfig
  namespace: default
data:
  special.level: info
  special.type: hello
[root@k8s-master ~]# kubectl apply -f myconfig.yaml 
configmap/myconfig created
[root@k8s-master ~]# kubectl get cm
NAME           DATA   AGE
myconfig       2      12s
redis.config   1      15m   
[root@k8s-master ~]# vim config-var.yaml                 #创建挂载文件
apiVersion: v1
kind: Pod
metadata:
  name: mypod
spec:
  containers:
    - name: busybox
      image: busybox
      command: [ "/bin/sh", "-c", "echo $(LEVEL) $(TYPE)" ]
      env:
        - name: LEVEL
          valueFrom:
            configMapKeyRef:
              name: myconfig
              key: special.level
        - name: TYPE
          valueFrom:
            configMapKeyRef:
              name: myconfig
              key: special.type
  restartPolicy: Never
[root@k8s-master ~]# kubectl apply -f config-var.yaml 
pod/mypod created                     
[root@k8s-master ~]# kubectl get pods
mypod                   0/1     Completed   0          40s
[root@k8s-master ~]# kubectl logs mypod                #查看挂载的值
info hello

END





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