9. 오라클 클라우드 - 쿠버네티스 -Job

<1>  job  = 단일로 수행하는 것

<2> cronjob = 일정 주기로 실행

<1>  job  = 단일로 수행하는 것

1

topasvga@cloudshell:~ (ap-seoul-1)$ cat << EOF > 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

> EOF

110 job.txt

2

topasvga@cloudshell:~ (ap-seoul-1)$ kubectl apply -f job.yaml && kubectl get pods -w

job.batch/pi created

NAME                READY   STATUS              RESTARTS   AGE

pi-62mft            0/1     ContainerCreating   0          2s

pi-62mft            1/1     Running             0          26s

//  이 버전에서는 잘 안됨.

3

kubectl get pods,jobs -o wide

4

결과 확인

topasvga@cloudshell:~ (ap-seoul-1)$ kubectl logs -l job-name=pi

5

다시 시도

topasvga@cloudshell:~ (ap-seoul-1)$ rm -rf *

6

topasvga@cloudshell:~ (ap-seoul-1)$ kubectl delete -f https://kubernetes.io/examples/controllers/job.yaml

job.batch "pi" deleted

7

topasvga@cloudshell:~ (ap-seoul-1)$ kubectl apply -f https://kubernetes.io/examples/controllers/job.yaml

job.batch/pi created

8

topasvga@cloudshell:~ (ap-seoul-1)$ kubectl describe jobs.batch pi

Name:             pi

Namespace:        default

Selector:         controller-uid=1db222cd-6292-467a-8fad-dbc5abe6032f

Labels:           controller-uid=1db222cd-6292-467a-8fad-dbc5abe6032f

                  job-name=pi

Annotations:      batch.kubernetes.io/job-tracking: 

Parallelism:      1

Completions:      1

Completion Mode:  NonIndexed

Start Time:       Tue, 21 Feb 2023 07:58:35 +0000

Pods Statuses:    1 Active (0 Ready) / 0 Succeeded / 0 Failed

Pod Template:

  Labels:  controller-uid=1db222cd-6292-467a-8fad-dbc5abe6032f

           job-name=pi

  Containers:

   pi:

    Image:      perl:5.34.0

    Port:       <none>

    Host Port:  <none>

    Command:

      perl

      -Mbignum=bpi

      -wle

      print bpi(2000)

    Environment:  <none>

    Mounts:       <none>

  Volumes:        <none>

Events:

  Type    Reason            Age   From            Message

  ----    ------            ----  ----            -------

  Normal  SuccessfulCreate  42s   job-controller  Created pod: pi-2wfrq

9

로그에서 결과 확인

topasvga@cloudshell:~ (ap-seoul-1)$ kubectl logs -l job-name=pi

3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679821480865132823066470938446095505822317253594081284811174502841027019385211055596446229489549303819644288109756659334461284756482337867831652712019091456485669234603486104543266482133936072602491412737245870066063155881748815209209628292540917153643678925903600113305305488204665213841469519415116094330572703657595919530921861173819326117931051185480744623799627495673518857527248912279381830119491298336733624406566430860213949463952247371907021798609437027705392171762931767523846748184676694051320005681271452635608277857713427577896091736371787214684409012249534301465495853710507922796892589235420199561121290219608640344181598136297747713099605187072113499999983729780499510597317328160963185950244594553469083026425223082533446850352619311881710100031378387528865875332083814206171776691473035982534904287554687311595628638823537875937519577818577805321712268066130019278766111959092164201989380952572010654858632788659361533818279682303019520353018529689957736225994138912497217752834791315155748572424541506959508295331168617278558890750983817546374649393192550604009277016711390098488240128583616035637076601047101819429555961989467678374494482553797747268471040475346462080466842590694912933136770289891521047521620569660240580381501935112533824300355876402474964732639141992726042699227967823547816360093417216412199245863150302861829745557067498385054945885869269956909272107975093029553211653449872027559602364806654991198818347977535663698074265425278625518184175746728909777727938000816470600161452491921732172147723501414419735685481613611573525521334757418494684385233239073941433345477624168625189835694855620992192221842725502542568876717904946016534668049886272327917860857843838279679766814541009538837863609506800642251252051173929848960841284886269456042419652850222106611863067442786220391949450471237137869609563643719172874677646575739624138908658326459958133904780275901

topasvga@cloudshell:~ (ap-seoul-1)$ 

 10

topasvga@cloudshell:~ (ap-seoul-1)$ kubectl get jobs.batch pi -o wide

NAME   COMPLETIONS   DURATION   AGE     CONTAINERS   IMAGES        SELECTOR

pi     1/1           53s        4m28s   pi           perl:5.34.0   controller-uid=1db222cd-6292-467a-8fad-dbc5abe6032f

11

삭제

topasvga@cloudshell:~ (ap-seoul-1)$ kubectl delete -f https://kubernetes.io/examples/controllers/job.yaml

job.batch "pi" deleted

topasvga@cloudshell:~ (ap-seoul-1)$ kubectl get jobs.batch pi -o wide

Error from server (NotFound): jobs.batch "pi" not found

topasvga@cloudshell:~ (ap-seoul-1)$ kubectl get pods

No resources found in default namespace.

<2> cronjob = 일정 주기로 실행

// 쿠버네티스 신규 버전에서는 안됨. yaml 수정 필요

1

topasvga@cloudshell:~ (ap-seoul-1)$ cat  << EOF > cronjob.yaml

> apiVersion: batch/v1beta1

> kind: CronJob

> metadata:

>   name: hello

> spec:

>   schedule: "*/1 * * * *"            #  매 1분마다 실행 

>   successfulJobsHistoryLimit: 10     # 성공 Job 10개 까지 기록

>   jobTemplate:                       # 실행될 Job 내용

>     spec:

>       template:

>         spec:

>           containers:

>           - name: hello

>             image: busybox

>             imagePullPolicy: IfNotPresent

>             command:

>             - /bin/sh

>             - -c

>             - date; echo Hello from the DKOS Member!

>           restartPolicy: OnFailure

> EOF

120 cronjob (1).txt

2

topasvga@cloudshell:~ (ap-seoul-1)$ kubectl apply -f cronjob.yaml && kubectl get jobs --watch

error: resource mapping not found for name: "hello" namespace: "" from "cronjob.yaml": no matches for kind "CronJob" in version "batch/v1beta1"

ensure CRDs are installed first

3

삭제

kubectl delete deploy,svc,pods --all

감사합니다.