적당한 이미지를 deploy한다.
$ kubectl create deployment hog --image vish/stress
deployment.apps/hog created
$ kubectl get deployments
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
hog 1 1 1 1 7m
$ kubectl describe deployment hog
Name: hog
Namespace: default
CreationTimestamp: Mon, 26 Nov 2018 20:32:09 +0900
Labels: app=hog
Annotations: deployment.kubernetes.io/revision=2
Selector: app=hog
Replicas: 1 desired | 1 updated | 1 total | 1 available | 0 unavailable
StrategyType: RollingUpdate
MinReadySeconds: 0
RollingUpdateStrategy: 25% max unavailable, 25% max surge
Pod Template:
Labels: app=hog
Containers:
stress:
Image: vish/stress
Port: <none>
Host Port: <none>
Environment: <none>
Mounts: <none>
Volumes: <none>
Conditions:
Type Status Reason
---- ------ ------
Available True MinimumReplicasAvailable
Progressing True NewReplicaSetAvailable
OldReplicaSets: <none>
NewReplicaSet: hog-58d797c5d8 (1/1 replicas created)
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal ScalingReplicaSet 8m deployment-controller Scaled up replica set hog-5cc4fdb68 to 1
Normal ScalingReplicaSet 2m deployment-controller Scaled up replica set hog-58d797c5d8 to 1
Normal ScalingReplicaSet 2m deployment-controller Scaled down replica set hog-5cc4fdb68 to 0
이를 yaml로 변경할 수 있다. 배포형태로 변경 가능하다.
$ kubectl get deployment hog -o yaml
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
annotations:
deployment.kubernetes.io/revision: "2"
creationTimestamp: 2018-11-26T10:32:09Z
generation: 2
labels:
app: hog
name: hog
namespace: default
resourceVersion: "6576"
selfLink: /apis/extensions/v3/namespaces/default/deployments/hog
uid: 873e80d8-f166-11e8-9a46-fa163e964181
spec:
progressDeadlineSeconds: 600
replicas: 1
revisionHistoryLimit: 10
selector:
matchLabels:
app: hog
strategy:
rollingUpdate:
maxSurge: 25%
maxUnavailable: 25%
type: RollingUpdate
template:
metadata:
creationTimestamp: null
labels:
app: hog
spec:
containers:
- image: vish/stress
imagePullPolicy: Always
name: stress
resources: {}
terminationMessagePath: /dev/termination-log
terminationMessagePolicy: File
dnsPolicy: ClusterFirst
restartPolicy: Always
schedulerName: default-scheduler
securityContext: {}
terminationGracePeriodSeconds: 30
status:
availableReplicas: 1
conditions:
- lastTransitionTime: 2018-11-26T10:32:15Z
lastUpdateTime: 2018-11-26T10:32:15Z
message: Deployment has minimum availability.
reason: MinimumReplicasAvailable
status: "True"
type: Available
- lastTransitionTime: 2018-11-26T10:32:09Z
lastUpdateTime: 2018-11-26T10:38:33Z
message: ReplicaSet "hog-58d797c5d8" has successfully progressed.
reason: NewReplicaSetAvailable
status: "True"
type: Progressing
observedGeneration: 2
readyReplicas: 1
replicas: 1
updatedReplicas: 1
설정 파일을 다운받고 deployment를 다시 진행한다.
$ kubectl get deployment hog --export -o yaml > hog.yaml
$ vi hog.yaml
resources: {} 부분을 다음과 같이 변경한다
resources:
limits:
memory: "4Gi"
requests:
memory: "2500Mi"
이제 변경된 내용으로 배포한다.
$ kubectl replace -f hog.yaml
반영된 부분을 확인할 수 있다.
$ kubectl get deployment hog -o yaml
resources:
limits:
memory: 4Gi
requests:
memory: 2500Mi
pod는 잘 동작하고 있다.
$ kubectl get po
NAME READY STATUS RESTARTS AGE
hog-58d797c5d8-r5lvd 1/1 Running 0 9m
$ kubectl logs hog-58d797c5d8-r5lvd
I1126 10:38:33.299667 1 main.go:26] Allocating "0" memory, in "4Ki" chunks, with a 1ms sleep between allocations
I1126 10:38:33.299827 1 main.go:29] Allocated "0" memory
자원 스트레스를 주기 위해 resources 설정을 변경한다.
resources:
limits:
cpu: "1"
memory: "4Gi"
requests:
cpu: "0.5"
memory: "500Mi"
args:
- -cpus
- "2"
- -mem-total
- "950Mi"
- -mem-alloc-size
- "100Mi"
- -mem-alloc-sleep
- "1s"
그리고 deployment을 삭제하고 생성한다.
$ kubectl delete deployment hog
deployment.extensions "hog" deleted
$ kubectl apply -f hog.yaml
deployment.extensions/hog created
$ kubectl get pod
NAME READY STATUS RESTARTS AGE
hog-786d4f7b8-mccsn 1/1 Running 0 44s
$ kubectl logs hog-786d4f7b8-mccsn
I1126 10:51:52.311973 1 main.go:26] Allocating "950Mi" memory, in "100Mi" chunks, with a 1s sleep between allocations
I1126 10:51:52.312143 1 main.go:39] Spawning a thread to consume CPU
I1126 10:51:52.312179 1 main.go:39] Spawning a thread to consume CPU
I1126 10:52:05.368902 1 main.go:29] Allocated "950Mi" memory
출처 : linux foundation 공부 자료에서
수상작: 장류진(張琉珍) 「일의 기쁨과 슬픔」
