클라우드/쿠버네티스(Kubernetes)
쿠버네티스 Kubernetes 잡 (Job)
두뚜
2021. 7. 9. 11:04
앞의 것들은 파드에 있는 어플리케이션을 계속적으로 실행하기 위한 형태
레이블셀렉터 지정
잡
프로그램을 실행해서 언젠가는 끝나는 작업
apache -> 지속적으로 작업
데이터베이스 백업 -> 계속하는거 아니다 백업이 완료되면 끝나야한다
임시작업 배치작업 batch 그룹
끝을 보장한다
방송사 인코딩디지털파일형태로 벼ㄴ환하는 작업
레이블셀렉터를 사용자가 지정하진 않는다
레이블을 잘못지정하면 레플리카셋이 관리하는 파드를
선택이 되어버릴수도 있다 -> 종료보장 -> 종료시켜버릴수있다
잘못된 레이블 지정하는걸 막는다
재시작 정책 설정
기본값 ALWAYS 종료됐는데 다시 시작? -> 오류
OnFailure / Never
-> 6번까지 재시작
파드를 세번 실행
하나만들어지고 종료 하나만들어지고 종료 하나만들어지고 종료
3번 세개가 동시에 실행
# YAML 파일 작성
vagrant@k-control:~$ cat ldh-job.yml
apiVersion: batch/v1
kind: Job
metadata:
name: ldh-job
spec:
template:
metadata:
labels:
app: dh-ds
spec:
restartPolicy: OnFailure
containers:
- image: busybox
name: ldh
command: ["sleep", "20"]
# 잡 오브젝트 생성
vagrant@k-control:~$ kubectl create -f ldh-job.yml
job.batch/ldh-job created
vagrant@k-control:~$ kubectl get job.batch
NAME COMPLETIONS DURATION AGE
ldh-job 1/1 28s 59s
vagrant@k-control:~$ kubectl get pods
NAME READY STATUS RESTARTS AGE
ldh-job-kwxj5 0/1 Completed 0 69s
ldh-pod 1/1 Running 2 41h
ldh-pod-label 1/1 Running 1 22h
ldh-rs-exp-b5bhs 1/1 Running 1 16h
vagrant@k-control:~$ kubectl get pods
NAME READY STATUS RESTARTS AGE
ldh-job-kwxj5 0/1 Completed 0 87s
ldh-pod 1/1 Running 2 41h
ldh-pod-label 1/1 Running 1 22h
ldh-rs-exp-b5bhs 1/1 Running 1 16h
vagrant@k-control:~$ kubectl get pods
NAME READY STATUS RESTARTS AGE
ldh-job-kwxj5 0/1 Completed 0 109s
ldh-pod 1/1 Running 2 41h
ldh-pod-label 1/1 Running 1 22h
ldh-rs-exp-b5bhs 1/1 Running 1 16h
vagrant@k-control:~$ kubectl get pods
NAME READY STATUS RESTARTS AGE
ldh-job-kwxj5 0/1 Completed 0 111s
ldh-pod 1/1 Running 2 41h
ldh-pod-label 1/1 Running 1 22h
ldh-rs-exp-b5bhs 1/1 Running 1 16h
vagrant@k-control:~$ kubectl get pods
NAME READY STATUS RESTARTS AGE
ldh-job-kwxj5 0/1 Completed 0 113s
ldh-pod 1/1 Running 2 41h
ldh-pod-label 1/1 Running 1 22h
ldh-rs-exp-b5bhs 1/1 Running 1 16h
vagrant@k-control:~$ kubectl get pods
NAME READY STATUS RESTARTS AGE
ldh-job-kwxj5 0/1 Completed 0 116s
ldh-pod 1/1 Running 2 41h
ldh-pod-label 1/1 Running 1 22h
ldh-rs-exp-b5bhs 1/1 Running 1 16h
vagrant@k-control:~$ kubectl get pods
NAME READY STATUS RESTARTS AGE
ldh-job-kwxj5 0/1 Completed 0 2m7s
ldh-pod 1/1 Running 2 41h
ldh-pod-label 1/1 Running 1 22h
ldh-rs-exp-b5bhs 1/1 Running 1 16h
vagrant@k-control:~$ kubectl get job.batch
NAME COMPLETIONS DURATION AGE
ldh-job 1/1 28s 2m26s
vagrant@k-control:~$ kubectl get job.batch
NAME COMPLETIONS DURATION AGE
ldh-job 1/1 28s 2m33s
vagrant@k-control:~$ kubectl get job.batch
NAME COMPLETIONS DURATION AGE
ldh-job 1/1 28s 2m48s
vagrant@k-control:~$ kubectl delete -f ldh-job.yml
job.batch "ldh-job" deleted
vagrant@k-control:~$ kubectl create -f ldh-job.yml
job.batch/ldh-job created
vagrant@k-control:~$ kubectl get job.batch
NAME COMPLETIONS DURATION AGE
ldh-job 0/1 4s 4s
vagrant@k-control:~$ kubectl get pods
NAME READY STATUS RESTARTS AGE
ldh-job-59dm2 1/1 Running 0 9s
ldh-pod 1/1 Running 2 41h
ldh-pod-label 1/1 Running 1 23h
ldh-rs-exp-b5bhs 1/1 Running 1 16h
vagrant@k-control:~$ kubectl get pods
NAME READY STATUS RESTARTS AGE
ldh-job-59dm2 1/1 Running 0 13s
ldh-pod 1/1 Running 2 41h
ldh-pod-label 1/1 Running 1 23h
ldh-rs-exp-b5bhs 1/1 Running 1 16h
vagrant@k-control:~$ kubectl get pods
NAME READY STATUS RESTARTS AGE
ldh-job-59dm2 1/1 Running 0 15s
ldh-pod 1/1 Running 2 41h
ldh-pod-label 1/1 Running 1 23h
ldh-rs-exp-b5bhs 1/1 Running 1 16h
vagrant@k-control:~$ kubectl get pods
NAME READY STATUS RESTARTS AGE
ldh-job-59dm2 1/1 Running 0 16s
ldh-pod 1/1 Running 2 41h
ldh-pod-label 1/1 Running 1 23h
ldh-rs-exp-b5bhs 1/1 Running 1 16h
vagrant@k-control:~$ kubectl get pods
NAME READY STATUS RESTARTS AGE
ldh-job-59dm2 1/1 Running 0 17s
ldh-pod 1/1 Running 2 41h
ldh-pod-label 1/1 Running 1 23h
ldh-rs-exp-b5bhs 1/1 Running 1 16h
vagrant@k-control:~$ kubectl get pods
NAME READY STATUS RESTARTS AGE
ldh-job-59dm2 1/1 Running 0 19s
ldh-pod 1/1 Running 2 41h
ldh-pod-label 1/1 Running 1 23h
ldh-rs-exp-b5bhs 1/1 Running 1 16h
vagrant@k-control:~$ kubectl get pods
NAME READY STATUS RESTARTS AGE
ldh-job-59dm2 1/1 Running 0 20s
ldh-pod 1/1 Running 2 41h
ldh-pod-label 1/1 Running 1 23h
ldh-rs-exp-b5bhs 1/1 Running 1 16h
vagrant@k-control:~$ kubectl get pods
NAME READY STATUS RESTARTS AGE
ldh-job-59dm2 1/1 Running 0 20s
ldh-pod 1/1 Running 2 41h
ldh-pod-label 1/1 Running 1 23h
ldh-rs-exp-b5bhs 1/1 Running 1 16h
vagrant@k-control:~$ kubectl get pods
NAME READY STATUS RESTARTS AGE
ldh-job-59dm2 1/1 Running 0 21s
ldh-pod 1/1 Running 2 41h
ldh-pod-label 1/1 Running 1 23h
ldh-rs-exp-b5bhs 1/1 Running 1 16h
vagrant@k-control:~$ kubectl get pods
NAME READY STATUS RESTARTS AGE
ldh-job-59dm2 1/1 Running 0 22s
ldh-pod 1/1 Running 2 41h
ldh-pod-label 1/1 Running 1 23h
ldh-rs-exp-b5bhs 1/1 Running 1 16h
vagrant@k-control:~$ kubectl get pods
NAME READY STATUS RESTARTS AGE
ldh-job-59dm2 1/1 Running 0 22s
ldh-pod 1/1 Running 2 41h
ldh-pod-label 1/1 Running 1 23h
ldh-rs-exp-b5bhs 1/1 Running 1 16h
vagrant@k-control:~$
vagrant@k-control:~$ kubectl get pods
NAME READY STATUS RESTARTS AGE
ldh-job-59dm2 1/1 Running 0 23s
ldh-pod 1/1 Running 2 41h
ldh-pod-label 1/1 Running 1 23h
ldh-rs-exp-b5bhs 1/1 Running 1 16h
vagrant@k-control:~$ kubectl get pods
NAME READY STATUS RESTARTS AGE
ldh-job-59dm2 1/1 Running 0 24s
ldh-pod 1/1 Running 2 41h
ldh-pod-label 1/1 Running 1 23h
ldh-rs-exp-b5bhs 1/1 Running 1 16h
vagrant@k-control:~$ kubectl get pods
NAME READY STATUS RESTARTS AGE
ldh-job-59dm2 0/1 Completed 0 25s
ldh-pod 1/1 Running 2 41h
ldh-pod-label 1/1 Running 1 23h
ldh-rs-exp-b5bhs 1/1 Running 1 16h
vagrant@k-control:~$vagrant@k-control:~$ cat ldh-job-comp.yml
apiVersion: batch/v1
kind: Job
metadata:
name: ldh-job-comp
spec:
completions: 3
template:
metadata:
labels:
app: ldh-job-comp
spec:
restartPolicy: OnFailure
containers:
- image: busybox
name: ldh
command: ["sleep", "20"]
vagrant@k-control:~$ kubectl create -f ldh-job-comp.yml
job.batch/ldh-job-comp created
vagrant@k-control:~$ kubectl get job.batch
NAME COMPLETIONS DURATION AGE
ldh-job 1/1 24s 5m10s
ldh-job-comp 0/3 8s 8s
vagrant@k-control:~$ kubectl get pods -watch
Error: unknown shorthand flag: 'a' in -atch
See 'kubectl get --help' for usage.
vagrant@k-control:~$ kubectl get pods --watch
NAME READY STATUS RESTARTS AGE
ldh-job-59dm2 0/1 Completed 0 5m27s
ldh-job-comp-qct2n 0/1 Completed 0 25s
ldh-job-comp-z2xqc 0/1 ContainerCreating 0 0s
ldh-pod 1/1 Running 2 42h
ldh-pod-label 1/1 Running 1 23h
ldh-rs-exp-b5bhs 1/1 Running 1 16h
ldh-job-comp-qct2n 0/1 Completed 0 25s
ldh-job-comp-z2xqc 0/1 ContainerCreating 0 1s
ldh-job-comp-z2xqc 1/1 Running 0 5s
ldh-job-comp-z2xqc 0/1 Completed 0 24s
ldh-job-comp-tmv6v 0/1 Pending 0 0s
ldh-job-comp-tmv6v 0/1 Pending 0 0s
ldh-job-comp-tmv6v 0/1 ContainerCreating 0 0s
ldh-job-comp-z2xqc 0/1 Completed 0 24s
ldh-job-comp-tmv6v 0/1 ContainerCreating 0 1s
ldh-job-comp-tmv6v 1/1 Running 0 4s
ldh-job-comp-tmv6v 0/1 Completed 0 24s
ldh-job-comp-tmv6v 0/1 Completed 0 24s
^Cvagrant@k-control:~$ kubectl get job.batch
NAME COMPLETIONS DURATION AGE
ldh-job 1/1 24s 7m12s
ldh-job-comp 3/3 73s 2m10s
vagrant@k-control:~$ kubectl delete -f ldh-job-comp.yml
job.batch "ldh-job-comp" deleted
vagrant@k-control:~$vagrant@k-control:~$ cat ldh-job-comp.yml
apiVersion: batch/v1
kind: Job
metadata:
name: ldh-job-comp
spec:
completions: 3
template:
metadata:
labels:
app: ldh-job-comp
spec:
restartPolicy: OnFailure
containers:
- image: busybox
name: ldh
command: ["sleep", "20"]
vagrant@k-control:~$ vi ldh-job-para.yml
vagrant@k-control:~$ kubectl create -f ldh-job-para.yml
job.batch/ldh-job-para created
vagrant@k-control:~$ kubectl get job.batch
NAME COMPLETIONS DURATION AGE
ldh-job 1/1 24s 15m
ldh-job-para 0/3 5s 5s
vagrant@k-control:~$ kubectl get pods --watch
NAME READY STATUS RESTARTS AGE
ldh-job-59dm2 0/1 Completed 0 16m
ldh-job-para-k5kk6 1/1 Running 0 12s
ldh-job-para-rch66 1/1 Running 0 12s
ldh-job-para-xkqz2 1/1 Running 0 12s
ldh-pod 1/1 Running 2 42h
ldh-pod-label 1/1 Running 1 23h
ldh-rs-exp-b5bhs 1/1 Running 1 17h
ldh-job-para-rch66 0/1 Completed 0 25s
ldh-job-para-rch66 0/1 Completed 0 25s
ldh-job-para-xkqz2 0/1 Completed 0 27s
ldh-job-para-xkqz2 0/1 Completed 0 27s
ldh-job-para-k5kk6 0/1 Completed 0 27s
ldh-job-para-k5kk6 0/1 Completed 0 27s
^Cvagrant@k-control:~$ kubectl get job.batch
NAME COMPLETIONS DURATION AGE
ldh-job 1/1 24s 17m
ldh-job-para 3/3 27s 82s
vagrant@k-control:~$ kubectl delete -f ldh-job-para.yml
job.batch "ldh-job-para" deleted
vagrant@k-control:~$vagrant@k-control:~$ cat ldh-job-atvdl.yml
apiVersion: batch/v1
kind: Job
metadata:
name: ldh-job-atvdl
spec:
backoffLimit: 3
activeDeadlineSeconds: 30
template:
metadata:
labels:
app: ldh-job-atvdl
spec:
restartPolicy: OnFailure
containers:
- image: busybox
name: ldh
command: ["sleep", "20"]
vagrant@k-control:~$ vi ldh-job-atvdl.yml
vagrant@k-control:~$ kubectl create -f ldh-job-atvdl.yml
Error from server (AlreadyExists): error when creating "ldh-job-atvdl.yml": jobs.batch "ldh-job-atvdl" already exists
vagrant@k-control:~$ kubectl delete -f ldh-job-atvdl.yml
job.batch "ldh-job-atvdl" deleted
vagrant@k-control:~$ kubectl create -f ldh-job-atvdl.yml
job.batch/ldh-job-atvdl created
vagrant@k-control:~$ kubectl get pods --watch
NAME READY STATUS RESTARTS AGE
ldh-job-59dm2 0/1 Completed 0 33m
ldh-job-atvdl-8rz2b 1/1 Running 0 4s
ldh-pod 1/1 Running 2 42h
ldh-pod-label 1/1 Running 1 23h
ldh-rs-exp-b5bhs 1/1 Running 1 17h
ldh-job-atvdl-8rz2b 1/1 Terminating 0 30s
ldh-job-atvdl-8rz2b 1/1 Terminating 0 54s
ldh-job-atvdl-8rz2b 0/1 Terminating 0 54s
ldh-job-atvdl-8rz2b 0/1 Terminating 0 59s
ldh-job-atvdl-8rz2b 0/1 Terminating 0 59s
^[[A^Cvagrant@k-contrkubectl get job.batch
NAME COMPLETIONS DURATION AGE
ldh-job 1/1 24s 34m
ldh-job-atvdl 0/1 85s 86s