kubernetes核心实战（七）--- job、CronJob、Secret

kubernetes核心实战（七）--- job、CronJob、Secret

10、job任务

使用perl，做pi的圆周率计算

[root@k8s-master-node1 ~/yaml/test]# vim job.yaml [root@k8s-master-node1 ~/yaml/test]# cat job.yaml apiVersion: batch/v1kind: Jobmetadata: name: pispec: template: spec: containers: - name: pi image: perl command: ["perl", "-Mbignum=bpi", "-wle", "print bpi(2000)"] restartPolicy: Never backoffLimit: 4[root@k8s-master-node1 ~/yaml/test]# [root@k8s-master-node1 ~/yaml/test]# kubectl apply -f job.yaml job.batch/pi created[root@k8s-master-node1 ~/yaml/test]#

查看任务

[root@k8s-master-node1 ~/yaml/test]# kubectl get podNAME READY STATUS RESTARTS AGEingress-demo-app-694bf5d965-8rh7f 1/1 Running 0 134mingress-demo-app-694bf5d965-swkpb 1/1 Running 0 134mnfs-client-provisioner-dc5789f74-5bznq 1/1 Running 0 118mpi--1-k5cbq 0/1 Completed 0 115sredis-app-86g4q 1/1 Running 0 4m14sredis-app-rt92n 1/1 Running 0 4m14sredis-app-vkzft 1/1 Running 0 4m14sweb-0 1/1 Running 0 67mweb-1 1/1 Running 0 67mweb-2 1/1 Running 0 67m[root@k8s-master-node1 ~/yaml/test]# kubectl get jobNAME COMPLETIONS DURATION AGEpi 1/1 84s 2m[root@k8s-master-node1 ~/yaml/test]#

查看计算结果

[root@k8s-master-node1 ~/yaml/test]# kubectl logs pi--1-k5cbq 3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679821480865132823066470938446095505822317253594081284811174502841027019385211055596446229489549303819644288109756659334461284756482337867831652712019091456485669234603486104543266482133936072602491412737245870066063155881748815209209628292540917153643678925903600113305305488204665213841469519415116094330572703657595919530921861173819326117931051185480744623799627495673518857527248912279381830119491298336733624406566430860213949463952247371907021798609437027705392171762931767523846748184676694051320005681271452635608277857713427577896091736371787214684409012249534301465495853710507922796892589235420199561121290219608640344181598136297747713099605187072113499999983729780499510597317328160963185950244594553469083026425223082533446850352619311881710100031378387528865875332083814206171776691473035982534904287554687311595628638823537875937519577818577805321712268066130019278766111959092164201989380952572010654858632788659361533818279682303019520353018529689957736225994138912497217752834791315155748572424541506959508295331168617278558890750983817546374649393192550604009277016711390098488240128583616035637076601047101819429555961989467678374494482553797747268471040475346462080466842590694912933136770289891521047521620569660240580381501935112533824300355876402474964732639141992726042699227967823547816360093417216412199245863150302861829745557067498385054945885869269956909272107975093029553211653449872027559602364806654991198818347977535663698074265425278625518184175746728909777727938000816470600161452491921732172147723501414419735685481613611573525521334757418494684385233239073941433345477624168625189835694855620992192221842725502542568876717904946016534668049886272327917860857843838279679766814541009538837863609506800642251252051173929848960841284886269456042419652850222106611863067442786220391949450471237137869609563643719172874677646575739624138908658326459958133904780275901[root@k8s-master-node1 ~/yaml/test]#

11、CronJob

CronJobs 对于创建周期性的、反复重复的任务很有用，例如执行数据备份或者发送邮件。CronJobs 也可以用来计划在指定时间来执行的独立任务，例如计划当集群看起来很空闲时 执行某个 Job。

创建任务

[root@k8s-master-node1 ~/yaml/test]# vim cronjob.yaml[root@k8s-master-node1 ~/yaml/test]# [root@k8s-master-node1 ~/yaml/test]# cat cronjob.yaml apiVersion: batch/v1beta1kind: CronJobmetadata: name: hellospec: schedule: "*/1 * * * *" 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-node1 ~/yaml/test]# [root@k8s-master-node1 ~/yaml/test]# kubectl apply -f cronjob.yaml Warning: batch/v1beta1 CronJob is deprecated in v1.21+, unavailable in v1.25+; use batch/v1 CronJobcronjob.batch/hello created[root@k8s-master-node1 ~/yaml/test]# kubectl get cronjobs.batch NAME SCHEDULE SUSPEND ACTIVE LAST SCHEDULE AGEhello */1 * * * * False 0 21s[root@k8s-master-node1 ~/yaml/test]# [root@k8s-master-node1 ~/yaml/test]#

查看结果

[root@k8s-master-node1 ~/yaml/test]# kubectl logs hello-27285668--1-zqg92 Wed Nov 17 09:08:18 UTC 2021Hello from the Kubernetes cluster[root@k8s-master-node1 ~/yaml/test]#

12、Secret

Secret 对象类型用来保存敏感信息，例如密码、OAuth 令牌和 SSH 密钥。将这些信息放在 secret 中比放在 Pod 的定义或者 容‍器镜像 中来说更加安全和灵活。

kubectl create secret docker-registry regcred \ --docker-server=<你的镜像仓库服务器> \ --docker-username=<你的用户名> \ --docker-password=<你的密码> \ --docker-email=<你的邮箱地址>

apiVersion: v1kind: Podmetadata: name: private-nginxspec: containers: - name: private-nginx image: chenbuyun/my-app:v1.0 imagePullSecrets: - name: regcred

https://blog.csdn.net/qq_33921750

https://my.oschina.net/u/3981543

https://zhihu.com/people/chen-bu-yun-2

https://segmentfault.com/u/hppyvyv6/articles

https://juejin.cn/user/3315782802482007

https://space.bilibili.com/352476552/article

https://cloud.tencent.com/developer/column/93230

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